Merge remote-tracking branch 'upstream/master' into OutdatedNoDevOption

.github/workflows/continuous-integration.yml

@@ -89,7 +89,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          extensions: "intl"
+          extensions: "intl, zip"
           ini-values: "memory_limit=-1, phar.readonly=0"
           php-version: "${{ matrix.php-version }}"
 

.github/workflows/phpstan.yml

@@ -31,7 +31,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          extensions: "intl"
+          extensions: "intl, zip"
           ini-values: "memory_limit=-1"
           php-version: "${{ matrix.php-version }}"
           tools: "cs2pr"
@@ -52,5 +52,5 @@ jobs:
 
       - name: Run PHPStan
         run: |
-          bin/composer require --dev phpstan/phpstan:^0.12 phpunit/phpunit:^7.5 --with-all-dependencies
-          vendor/bin/phpstan analyse --configuration=phpstan/config.neon --error-format=checkstyle | cs2pr
+          bin/composer require --dev phpstan/phpstan:^0.12.26 phpunit/phpunit:^7.5 --with-all-dependencies
+          vendor/bin/phpstan analyse --configuration=phpstan/config.neon || vendor/bin/phpstan analyse --configuration=phpstan/config.neon --error-format=checkstyle | cs2pr

UPGRADE-2.0.md

@@ -17,6 +17,7 @@
 - `PluginInterface` added a deactivate (so plugin can stop whatever it is doing) and an uninstall (so the plugin can remove any files it created or do general cleanup) method.
 - Plugins implementing `EventSubscriberInterface` will be deregistered from the EventDispatcher automatically when being deactivated, nothing to do there.
 - `Pool` objects are now created via the `RepositorySet` class, you should use that in case you were using the `Pool` class directly.
+- Custom installers extending from LibraryInstaller should be aware that in Composer 2 it MAY return PromiseInterface instances when calling parent::install/update/uninstall/installCode/removeCode. See [composer/installers](https://github.com/composer/installers/commit/5006d0c28730ade233a8f42ec31ac68fb1c5c9bb) for an example of how to handle this best.
 - The `Composer\Installer` class changed quite a bit internally, but the inputs are almost the same:
   - `setAdditionalInstalledRepository` is now `setAdditionalFixedRepository`
   - `setUpdateWhitelist` is now `setUpdateAllowList`

composer.json

@@ -22,7 +22,7 @@
         }
     ],
     "require": {
-        "php": "^5.3.2 || ^7.0",
+        "php": "^5.3.2 || ^7.0 || ^8.0",
         "composer/ca-bundle": "^1.0",
         "composer/semver": "^3.0",
         "composer/spdx-licenses": "^1.2",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "b39e04ca4a44810c96876dae02629707",
+    "content-hash": "9b94ece2895724239b36aec399e5321a",
     "packages": [
         {
             "name": "composer/ca-bundle",
@@ -268,7 +268,7 @@
             "support": {
                 "irc": "irc://irc.freenode.org/composer",
                 "issues": "https://github.com/composer/xdebug-handler/issues",
-                "source": "https://github.com/composer/xdebug-handler/tree/master"
+                "source": "https://github.com/composer/xdebug-handler/tree/1.4.2"
             },
             "funding": [
                 {
@@ -1504,7 +1504,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^5.3.2 || ^7.0"
+        "php": "^5.3.2 || ^7.0 || ^8.0"
     },
     "platform-dev": [],
     "platform-overrides": {

doc/03-cli.md

@@ -785,7 +785,7 @@ Lists the name, version and license of every package installed. Use
 
 ### Options
 
-* **--format:** Format of the output: text or json (default: "text")
+* **--format:** Format of the output: text, json or summary (default: "text")
 * **--no-dev:** Remove dev dependencies from the output
 
 ## run-script

phpstan/config.neon

@@ -1,7 +1,5 @@
 parameters:
     level: 1
-    autoload_files:
-        - '../src/bootstrap.php'
     excludes_analyse:
        - '../tests/Composer/Test/Fixtures/*'
        - '../tests/Composer/Test/Autoload/Fixtures/*'
@@ -28,11 +26,9 @@ parameters:
         # BC with older PHPUnit
         - '~^Call to an undefined static method PHPUnit\\Framework\\TestCase::setExpectedException\(\)\.$~'
 
-        # hhvm should have support for $this in closures
-        -
-            count: 1
-            message: '~^Using \$this inside anonymous function is prohibited because of PHP 5\.3 support\.$~'
-            path: '../tests/Composer/Test/Repository/PlatformRepositoryTest.php'
+        # ZipArchive::* Class constants are already checked before use.
+        - '~^Access to undefined constant ZipArchive::~'
+
     paths:
         - ../src
         - ../tests

src/Composer/Autoload/AutoloadGenerator.php

@@ -257,16 +257,16 @@ EOF;
 EOF;
         }
 
-        $blacklist = null;
+        $excluded = null;
         if (!empty($autoloads['exclude-from-classmap'])) {
-            $blacklist = '{(' . implode('|', $autoloads['exclude-from-classmap']) . ')}';
+            $excluded = '{(' . implode('|', $autoloads['exclude-from-classmap']) . ')}';
         }
 
         $classMap = array();
         $ambiguousClasses = array();
         $scannedFiles = array();
         foreach ($autoloads['classmap'] as $dir) {
-            $classMap = $this->addClassMapCode($filesystem, $basePath, $vendorPath, $dir, $blacklist, null, null, $classMap, $ambiguousClasses, $scannedFiles);
+            $classMap = $this->addClassMapCode($filesystem, $basePath, $vendorPath, $dir, $excluded, null, null, $classMap, $ambiguousClasses, $scannedFiles);
         }
 
         if ($scanPsrPackages) {
@@ -289,7 +289,7 @@ EOF;
                             continue;
                         }
 
-                        $classMap = $this->addClassMapCode($filesystem, $basePath, $vendorPath, $dir, $blacklist, $namespace, $group['type'], $classMap, $ambiguousClasses, $scannedFiles);
+                        $classMap = $this->addClassMapCode($filesystem, $basePath, $vendorPath, $dir, $excluded, $namespace, $group['type'], $classMap, $ambiguousClasses, $scannedFiles);
                     }
                 }
             }
@@ -368,9 +368,9 @@ EOF;
         return count($classMap);
     }
 
-    private function addClassMapCode($filesystem, $basePath, $vendorPath, $dir, $blacklist, $namespaceFilter, $autoloadType, array $classMap, array &$ambiguousClasses, array &$scannedFiles)
+    private function addClassMapCode($filesystem, $basePath, $vendorPath, $dir, $excluded, $namespaceFilter, $autoloadType, array $classMap, array &$ambiguousClasses, array &$scannedFiles)
     {
-        foreach ($this->generateClassMap($dir, $blacklist, $namespaceFilter, $autoloadType, true, $scannedFiles) as $class => $path) {
+        foreach ($this->generateClassMap($dir, $excluded, $namespaceFilter, $autoloadType, true, $scannedFiles) as $class => $path) {
             $pathCode = $this->getPathCode($filesystem, $basePath, $vendorPath, $path).",\n";
             if (!isset($classMap[$class])) {
                 $classMap[$class] = $pathCode;
@@ -382,9 +382,9 @@ EOF;
         return $classMap;
     }
 
-    private function generateClassMap($dir, $blacklist, $namespaceFilter, $autoloadType, $showAmbiguousWarning, array &$scannedFiles)
+    private function generateClassMap($dir, $excluded, $namespaceFilter, $autoloadType, $showAmbiguousWarning, array &$scannedFiles)
     {
-        return ClassMapGenerator::createMap($dir, $blacklist, $showAmbiguousWarning ? $this->io : null, $namespaceFilter, $autoloadType, $scannedFiles);
+        return ClassMapGenerator::createMap($dir, $excluded, $showAmbiguousWarning ? $this->io : null, $namespaceFilter, $autoloadType, $scannedFiles);
     }
 
     public function buildPackageMap(InstallationManager $installationManager, PackageInterface $mainPackage, array $packages)
@@ -488,15 +488,15 @@ EOF;
         }
 
         if (isset($autoloads['classmap'])) {
-            $blacklist = null;
+            $excluded = null;
             if (!empty($autoloads['exclude-from-classmap'])) {
-                $blacklist = '{(' . implode('|', $autoloads['exclude-from-classmap']) . ')}';
+                $excluded = '{(' . implode('|', $autoloads['exclude-from-classmap']) . ')}';
             }
 
             $scannedFiles = array();
             foreach ($autoloads['classmap'] as $dir) {
                 try {
-                    $loader->addClassMap($this->generateClassMap($dir, $blacklist, null, null, false, $scannedFiles));
+                    $loader->addClassMap($this->generateClassMap($dir, $excluded, null, null, false, $scannedFiles));
                 } catch (\RuntimeException $e) {
                     $this->io->writeError('<warning>'.$e->getMessage().'</warning>');
                 }
@@ -640,6 +640,10 @@ EOF;
                         }
                     }
 
+                    if ($match[1] === 'zend-opcache') {
+                        $match[1] = 'zend opcache';
+                    }
+
                     $extension = var_export($match[1], true);
                     if ($match[1] === 'pcntl' || $match[1] === 'readline') {
                         $requiredExtensions[$extension] = "PHP_SAPI !== 'cli' || extension_loaded($extension) || \$missingExtensions[] = $extension;\n";

src/Composer/Autoload/ClassMapGenerator.php

@@ -51,7 +51,7 @@ class ClassMapGenerator
      * Iterate over all files in the given directory searching for classes
      *
      * @param \Iterator|string $path         The path to search in or an iterator
-     * @param string           $blacklist    Regex that matches against the file path that exclude from the classmap.
+     * @param string           $excluded    Regex that matches against the file path that exclude from the classmap.
      * @param IOInterface      $io           IO object
      * @param string           $namespace    Optional namespace prefix to filter by
      * @param string           $autoloadType psr-0|psr-4 Optional autoload standard to use mapping rules
@@ -59,7 +59,7 @@ class ClassMapGenerator
      * @throws \RuntimeException When the path is neither an existing file nor directory
      * @return array             A class map array
      */
-    public static function createMap($path, $blacklist = null, IOInterface $io = null, $namespace = null, $autoloadType = null, &$scannedFiles = array())
+    public static function createMap($path, $excluded = null, IOInterface $io = null, $namespace = null, $autoloadType = null, &$scannedFiles = array())
     {
         $basePath = $path;
         if (is_string($path)) {
@@ -102,12 +102,12 @@ class ClassMapGenerator
                 continue;
             }
 
-            // check the realpath of the file against the blacklist as the path might be a symlink and the blacklist is realpath'd so symlink are resolved
-            if ($blacklist && preg_match($blacklist, strtr($realPath, '\\', '/'))) {
+            // check the realpath of the file against the excluded paths as the path might be a symlink and the excluded path is realpath'd so symlink are resolved
+            if ($excluded && preg_match($excluded, strtr($realPath, '\\', '/'))) {
                 continue;
             }
             // check non-realpath of file for directories symlink in project dir
-            if ($blacklist && preg_match($blacklist, strtr($filePath, '\\', '/'))) {
+            if ($excluded && preg_match($excluded, strtr($filePath, '\\', '/'))) {
                 continue;
             }
 

src/Composer/Command/ArchiveCommand.php

@@ -23,6 +23,7 @@ use Composer\Plugin\CommandEvent;
 use Composer\Plugin\PluginEvents;
 use Composer\Util\Filesystem;
 use Composer\Util\Loop;
+use Composer\Util\ProcessExecutor;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -112,9 +113,10 @@ EOT
             $archiveManager = $composer->getArchiveManager();
         } else {
             $factory = new Factory;
+            $process = new ProcessExecutor();
             $httpDownloader = $factory->createHttpDownloader($io, $config);
-            $downloadManager = $factory->createDownloadManager($io, $config, $httpDownloader);
-            $archiveManager = $factory->createArchiveManager($config, $downloadManager, new Loop($httpDownloader));
+            $downloadManager = $factory->createDownloadManager($io, $config, $httpDownloader, $process);
+            $archiveManager = $factory->createArchiveManager($config, $downloadManager, new Loop($httpDownloader, $process));
         }
 
         if ($packageName) {

src/Composer/Command/CreateProjectCommand.php

@@ -38,6 +38,7 @@ use Symfony\Component\Finder\Finder;
 use Composer\Json\JsonFile;
 use Composer\Config\JsonConfigSource;
 use Composer\Util\Filesystem;
+use Composer\Util\ProcessExecutor;
 use Composer\Util\Loop;
 use Composer\Package\Version\VersionParser;
 
@@ -186,7 +187,8 @@ EOT
             $composer = Factory::create($io, null, $disablePlugins);
         }
 
-        $fs = new Filesystem();
+        $process = new ProcessExecutor($io);
+        $fs = new Filesystem($process);
 
         if ($noScripts === false) {
             // dispatch event
@@ -199,6 +201,8 @@ EOT
 
         // install dependencies of the created project
         if ($noInstall === false) {
+            $composer->getInstallationManager()->setOutputProgress(!$noProgress);
+
             $installer = Installer::create($io, $composer);
             $installer->setPreferSource($preferSource)
                 ->setPreferDist($preferDist)
@@ -210,6 +214,10 @@ EOT
                 ->setClassMapAuthoritative($config->get('classmap-authoritative'))
                 ->setApcuAutoloader($config->get('apcu-autoloader'));
 
+            if (!$composer->getLocker()->isLocked()) {
+                $installer->setUpdate(true);
+            }
+
             if ($disablePlugins) {
                 $installer->disablePlugins();
             }
@@ -307,7 +315,8 @@ EOT
             $directory = getcwd() . DIRECTORY_SEPARATOR . array_pop($parts);
         }
 
-        $fs = new Filesystem();
+        $process = new ProcessExecutor($io);
+        $fs = new Filesystem($process);
         if (!$fs->isAbsolutePath($directory)) {
             $directory = getcwd() . DIRECTORY_SEPARATOR . $directory;
         }
@@ -397,12 +406,13 @@ EOT
         $factory = new Factory();
 
         $httpDownloader = $factory->createHttpDownloader($io, $config);
-        $dm = $factory->createDownloadManager($io, $config, $httpDownloader);
+        $dm = $factory->createDownloadManager($io, $config, $httpDownloader, $process);
         $dm->setPreferSource($preferSource)
             ->setPreferDist($preferDist);
 
-        $projectInstaller = new ProjectInstaller($directory, $dm);
-        $im = $factory->createInstallationManager(new Loop($httpDownloader), $io);
+        $projectInstaller = new ProjectInstaller($directory, $dm, $fs);
+        $im = $factory->createInstallationManager(new Loop($httpDownloader, $process), $io);
+        $im->setOutputProgress(!$noProgress);
         $im->addInstaller($projectInstaller);
         $im->execute(new InstalledFilesystemRepository(new JsonFile('php://memory')), array(new InstallOperation($package)));
         $im->notifyInstalls($io);

src/Composer/Command/DiagnoseCommand.php

@@ -431,7 +431,11 @@ EOT
         }
 
         $versionsUtil = new Versions($config, $this->httpDownloader);
+        try {
             $latest = $versionsUtil->getLatest();
+        } catch (\Exception $e) {
+            return $e;
+        }
 
         if (Composer::VERSION !== $latest['version'] && Composer::VERSION !== '@package_version@') {
             return '<comment>You are not running the latest '.$versionsUtil->getChannel().' version, run `composer self-update` to update ('.Composer::VERSION.' => '.$latest['version'].')</comment>';

src/Composer/Command/InstallCommand.php

@@ -106,6 +106,8 @@ EOT
 
         $ignorePlatformReqs = $input->getOption('ignore-platform-reqs') ?: ($input->getOption('ignore-platform-req') ?: false);
 
+        $composer->getInstallationManager()->setOutputProgress(!$input->getOption('no-progress'));
+
         $install
             ->setDryRun($input->getOption('dry-run'))
             ->setVerbose($input->getOption('verbose'))

src/Composer/Command/LicensesCommand.php

@@ -21,6 +21,7 @@ use Symfony\Component\Console\Helper\Table;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
 
 /**
  * @author Benoît Merlet <benoit.merlet@gmail.com>
@@ -111,6 +112,28 @@ EOT
                 )));
                 break;
 
+            case 'summary':
+                $dependencies = array();
+                foreach ($packages as $package) {
+                    $license = $package->getLicense();
+                    $licenseName = $license[0];
+                    if (!isset($dependencies[$licenseName])) {
+                        $dependencies[$licenseName] = 0;
+                    }
+                    $dependencies[$licenseName]++;
+                }
+
+                $rows = array();
+                foreach ($dependencies as $usedLicense => $numberOfDependencies) {
+                    $rows[] = array($usedLicense, $numberOfDependencies);
+                }
+
+                $symfonyIo = new SymfonyStyle($input, $output);
+                $symfonyIo->table(
+                    array('License', 'Number of dependencies'),
+                    $rows
+                );
+                break;
             default:
                 throw new \RuntimeException(sprintf('Unsupported format "%s".  See help for supported formats.', $format));
         }

src/Composer/Command/RemoveCommand.php

@@ -220,6 +220,8 @@ EOT
         $commandEvent = new CommandEvent(PluginEvents::COMMAND, 'remove', $input, $output);
         $composer->getEventDispatcher()->dispatch($commandEvent->getName(), $commandEvent);
 
+        $composer->getInstallationManager()->setOutputProgress(!$input->getOption('no-progress'));
+
         $install = Installer::create($io, $composer);
 
         $updateDevMode = !$input->getOption('update-no-dev');
@@ -237,7 +239,7 @@ EOT
             $flags .= ' --with-dependencies';
         }
 
-        $io->writeError('<info>Running composer update '.implode(' ', $packages).$flags);
+        $io->writeError('<info>Running composer update '.implode(' ', $packages).$flags.'</info>');
 
         $ignorePlatformReqs = $input->getOption('ignore-platform-reqs') ?: ($input->getOption('ignore-platform-req') ?: false);
 

src/Composer/Command/RequireCommand.php

@@ -281,11 +281,13 @@ EOT
             $flags .= ' --with-dependencies';
         }
 
-        $io->writeError('<info>Running composer update '.implode(' ', array_keys($requirements)).$flags);
+        $io->writeError('<info>Running composer update '.implode(' ', array_keys($requirements)).$flags.'</info>');
 
         $commandEvent = new CommandEvent(PluginEvents::COMMAND, 'require', $input, $output);
         $composer->getEventDispatcher()->dispatch($commandEvent->getName(), $commandEvent);
 
+        $composer->getInstallationManager()->setOutputProgress(!$input->getOption('no-progress'));
+
         $install = Installer::create($io, $composer);
 
         $ignorePlatformReqs = $input->getOption('ignore-platform-reqs') ?: ($input->getOption('ignore-platform-req') ?: false);

src/Composer/Command/UpdateCommand.php

@@ -180,6 +180,8 @@ EOT
         $commandEvent = new CommandEvent(PluginEvents::COMMAND, 'update', $input, $output);
         $composer->getEventDispatcher()->dispatch($commandEvent->getName(), $commandEvent);
 
+        $composer->getInstallationManager()->setOutputProgress(!$input->getOption('no-progress'));
+
         $install = Installer::create($io, $composer);
 
         $config = $composer->getConfig();

src/Composer/Console/Application.php

@@ -156,7 +156,7 @@ class Application extends BaseApplication
         }
 
         // prompt user for dir change if no composer.json is present in current dir
-        if ($io->isInteractive() && !$newWorkDir && !in_array($commandName, array('', 'list', 'init', 'about', 'help', 'diagnose', 'self-update', 'global', 'create-project'), true) && !file_exists(Factory::getComposerFile())) {
+        if ($io->isInteractive() && !$newWorkDir && !in_array($commandName, array('', 'list', 'init', 'about', 'help', 'diagnose', 'self-update', 'global', 'create-project', 'outdated'), true) && !file_exists(Factory::getComposerFile())) {
             $dir = dirname(getcwd());
             $home = realpath(getenv('HOME') ?: getenv('USERPROFILE') ?: '/');
 

src/Composer/DependencyResolver/Operation/InstallOperation.php

@@ -61,7 +61,12 @@ class InstallOperation extends SolverOperation
      */
     public function show($lock)
     {
-        return ($lock ? 'Locking ' : 'Installing ').'<info>'.$this->package->getPrettyName().'</info> (<comment>'.$this->package->getFullPrettyVersion().'</comment>)';
+        return self::format($this->package, $lock);
+    }
+
+    public static function format(PackageInterface $package, $lock = false)
+    {
+        return ($lock ? 'Locking ' : 'Installing ').'<info>'.$package->getPrettyName().'</info> (<comment>'.$package->getFullPrettyVersion().'</comment>)';
     }
 
     /**

src/Composer/DependencyResolver/Operation/UninstallOperation.php

@@ -61,7 +61,12 @@ class UninstallOperation extends SolverOperation
      */
     public function show($lock)
     {
-        return 'Removing <info>'.$this->package->getPrettyName().'</info> (<comment>'.$this->package->getFullPrettyVersion().'</comment>)';
+        return self::format($this->package, $lock);
+    }
+
+    public static function format(PackageInterface $package, $lock = false)
+    {
+        return 'Removing <info>'.$package->getPrettyName().'</info> (<comment>'.$package->getFullPrettyVersion().'</comment>)';
     }
 
     /**

src/Composer/DependencyResolver/Operation/UpdateOperation.php

@@ -75,20 +75,25 @@ class UpdateOperation extends SolverOperation
      */
     public function show($lock)
     {
-        $fromVersion = $this->initialPackage->getFullPrettyVersion();
-        $toVersion = $this->targetPackage->getFullPrettyVersion();
-
-        if ($fromVersion === $toVersion && $this->initialPackage->getSourceReference() !== $this->targetPackage->getSourceReference()) {
-            $fromVersion = $this->initialPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_SOURCE_REF);
-            $toVersion = $this->targetPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_SOURCE_REF);
-        } elseif ($fromVersion === $toVersion && $this->initialPackage->getDistReference() !== $this->targetPackage->getDistReference()) {
-            $fromVersion = $this->initialPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_DIST_REF);
-            $toVersion = $this->targetPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_DIST_REF);
+        return self::format($this->initialPackage, $this->targetPackage, $lock);
     }
 
-        $actionName = VersionParser::isUpgrade($this->initialPackage->getVersion(), $this->targetPackage->getVersion()) ? 'Upgrading' : 'Downgrading';
+    public static function format(PackageInterface $initialPackage, PackageInterface $targetPackage, $lock = false)
+    {
+        $fromVersion = $initialPackage->getFullPrettyVersion();
+        $toVersion = $targetPackage->getFullPrettyVersion();
 
-        return $actionName.' <info>'.$this->initialPackage->getPrettyName().'</info> (<comment>'.$fromVersion.'</comment> => <comment>'.$toVersion.'</comment>)';
+        if ($fromVersion === $toVersion && $initialPackage->getSourceReference() !== $targetPackage->getSourceReference()) {
+            $fromVersion = $initialPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_SOURCE_REF);
+            $toVersion = $targetPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_SOURCE_REF);
+        } elseif ($fromVersion === $toVersion && $initialPackage->getDistReference() !== $targetPackage->getDistReference()) {
+            $fromVersion = $initialPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_DIST_REF);
+            $toVersion = $targetPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_DIST_REF);
+        }
+
+        $actionName = VersionParser::isUpgrade($initialPackage->getVersion(), $targetPackage->getVersion()) ? 'Upgrading' : 'Downgrading';
+
+        return $actionName.' <info>'.$initialPackage->getPrettyName().'</info> (<comment>'.$fromVersion.'</comment> => <comment>'.$toVersion.'</comment>)';
     }
 
     /**

src/Composer/DependencyResolver/Pool.php

@@ -14,6 +14,7 @@ namespace Composer\DependencyResolver;
 
 use Composer\Package\AliasPackage;
 use Composer\Package\Version\VersionParser;
+use Composer\Semver\CompilingMatcher;
 use Composer\Semver\Constraint\ConstraintInterface;
 use Composer\Semver\Constraint\Constraint;
 use Composer\Package\PackageInterface;
@@ -146,9 +147,7 @@ class Pool implements \Countable
         $candidateVersion = $candidate->getVersion();
 
         if ($candidateName === $name) {
-            $pkgConstraint = new Constraint('==', $candidateVersion);
-
-            if ($constraint === null || $constraint->matches($pkgConstraint)) {
+            if ($constraint === null || CompilingMatcher::match($constraint, Constraint::OP_EQ, $candidateVersion)) {
                 return true;
             }
 

src/Composer/DependencyResolver/PoolBuilder.php

@@ -12,21 +12,21 @@
 
 namespace Composer\DependencyResolver;
 
+use Composer\EventDispatcher\EventDispatcher;
 use Composer\IO\IOInterface;
 use Composer\Package\AliasPackage;
 use Composer\Package\BasePackage;
-use Composer\Package\Package;
 use Composer\Package\PackageInterface;
 use Composer\Package\Version\StabilityFilter;
+use Composer\Plugin\PluginEvents;
+use Composer\Plugin\PrePoolCreateEvent;
 use Composer\Repository\PlatformRepository;
 use Composer\Repository\RootPackageRepository;
+use Composer\Semver\CompilingMatcher;
 use Composer\Semver\Constraint\Constraint;
 use Composer\Semver\Constraint\ConstraintInterface;
 use Composer\Semver\Constraint\MatchAllConstraint;
 use Composer\Semver\Constraint\MultiConstraint;
-use Composer\EventDispatcher\EventDispatcher;
-use Composer\Plugin\PrePoolCreateEvent;
-use Composer\Plugin\PluginEvents;
 
 /**
  * @author Nils Adermann <naderman@naderman.de>
@@ -88,7 +88,7 @@ class PoolBuilder
      * @param int[] $stabilityFlags an array of package name => BasePackage::STABILITY_* value
      * @psalm-param array<string, int> $stabilityFlags
      * @param array[] $rootAliases
-     * @psalm-param list<array{package: string, version: string, alias: string, alias_normalized: string}> $rootAliases
+     * @psalm-param array<string, array<string, array{alias: string, alias_normalized: string}>> $rootAliases
      * @param string[] $rootReferences an array of package name => source reference
      * @psalm-param array<string, string> $rootReferences
      */
@@ -96,7 +96,7 @@ class PoolBuilder
     {
         $this->acceptableStabilities = $acceptableStabilities;
         $this->stabilityFlags = $stabilityFlags;
-        $this->rootAliases = $this->getRootAliasesPerPackage($rootAliases);
+        $this->rootAliases = $rootAliases;
         $this->rootReferences = $rootReferences;
         $this->eventDispatcher = $eventDispatcher;
         $this->io = $io;
@@ -209,7 +209,7 @@ class PoolBuilder
 
                 $found = false;
                 foreach ($aliasedPackages as $packageOrAlias) {
-                    if ($constraint->matches(new Constraint('==', $packageOrAlias->getVersion()))) {
+                    if (CompilingMatcher::match($constraint, Constraint::OP_EQ, $packageOrAlias->getVersion())) {
                         $found = true;
                     }
                 }
@@ -425,19 +425,5 @@ class PoolBuilder
         unset($this->skippedLoad[$name]);
         unset($this->loadedNames[$name]);
     }
-
-    private function getRootAliasesPerPackage(array $aliases)
-    {
-        $normalizedAliases = array();
-
-        foreach ($aliases as $alias) {
-            $normalizedAliases[$alias['package']][$alias['version']] = array(
-                'alias' => $alias['alias'],
-                'alias_normalized' => $alias['alias_normalized'],
-            );
-        }
-
-        return $normalizedAliases;
-    }
 }
 

src/Composer/Downloader/ArchiveDownloader.php

@@ -16,6 +16,8 @@ use Composer\Package\PackageInterface;
 use Symfony\Component\Finder\Finder;
 use Composer\IO\IOInterface;
 use Composer\Exception\IrrecoverableDownloadException;
+use React\Promise\PromiseInterface;
+use Composer\DependencyResolver\Operation\InstallOperation;
 
 /**
  * Base downloader for archives
@@ -28,14 +30,7 @@ abstract class ArchiveDownloader extends FileDownloader
 {
     public function download(PackageInterface $package, $path, PackageInterface $prevPackage = null, $output = true)
     {
-        $res = parent::download($package, $path, $prevPackage, $output);
-
-        // if not downgrading and the dir already exists it seems we have an inconsistent state in the vendor dir and the user should fix it
-        if (!$prevPackage && is_dir($path) && !$this->filesystem->isDirEmpty($path)) {
-            throw new IrrecoverableDownloadException('Expected empty path to extract '.$package.' into but directory exists: '.$path);
-        }
-
-        return $res;
+        return parent::download($package, $path, $prevPackage, $output);
     }
 
     /**
@@ -46,40 +41,75 @@ abstract class ArchiveDownloader extends FileDownloader
     public function install(PackageInterface $package, $path, $output = true)
     {
         if ($output) {
-            $this->io->writeError("  - Installing <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>): Extracting archive");
+            $this->io->writeError("  - " . InstallOperation::format($package).": Extracting archive");
         } else {
             $this->io->writeError('Extracting archive', false);
         }
 
-        $this->filesystem->ensureDirectoryExists($path);
-        if (!$this->filesystem->isDirEmpty($path)) {
-            throw new \UnexpectedValueException('Expected empty path to extract '.$package.' into but directory exists: '.$path);
-        }
+        $this->filesystem->emptyDirectory($path);
 
         do {
             $temporaryDir = $this->config->get('vendor-dir').'/composer/'.substr(md5(uniqid('', true)), 0, 8);
         } while (is_dir($temporaryDir));
 
+        $this->addCleanupPath($package, $temporaryDir);
+        $this->addCleanupPath($package, $path);
+
+        $this->filesystem->ensureDirectoryExists($temporaryDir);
         $fileName = $this->getFileName($package, $path);
 
-        try {
-            $this->filesystem->ensureDirectoryExists($temporaryDir);
-            try {
-                $this->extract($package, $fileName, $temporaryDir);
-            } catch (\Exception $e) {
+        $filesystem = $this->filesystem;
+        $self = $this;
+
+        $cleanup = function () use ($path, $filesystem, $temporaryDir, $package, $self) {
             // remove cache if the file was corrupted
-                parent::clearLastCacheWrite($package);
+            $self->clearLastCacheWrite($package);
+
+            // clean up
+            $filesystem->removeDirectory($path);
+            $filesystem->removeDirectory($temporaryDir);
+            $self->removeCleanupPath($package, $temporaryDir);
+            $self->removeCleanupPath($package, $path);
+        };
+
+        $promise = null;
+        try {
+            $promise = $this->extract($package, $fileName, $temporaryDir);
+        } catch (\Exception $e) {
+            $cleanup();
             throw $e;
         }
 
-            $this->filesystem->unlink($fileName);
+        if (!$promise instanceof PromiseInterface) {
+            $promise = \React\Promise\resolve();
+        }
+
+        return $promise->then(function () use ($self, $package, $filesystem, $fileName, $temporaryDir, $path) {
+            $filesystem->unlink($fileName);
+
+            /**
+             * Returns the folder content, excluding .DS_Store
+             *
+             * @param  string         $dir Directory
+             * @return \SplFileInfo[]
+             */
+            $getFolderContent = function ($dir) {
+                $finder = Finder::create()
+                    ->ignoreVCS(false)
+                    ->ignoreDotFiles(false)
+                    ->notName('.DS_Store')
+                    ->depth(0)
+                    ->in($dir);
+
+                return iterator_to_array($finder);
+            };
 
             $renameAsOne = false;
-            if (!file_exists($path) || ($this->filesystem->isDirEmpty($path) && $this->filesystem->removeDirectory($path))) {
+            if (!file_exists($path) || ($filesystem->isDirEmpty($path) && $filesystem->removeDirectory($path))) {
                 $renameAsOne = true;
             }
 
-            $contentDir = $this->getFolderContent($temporaryDir);
+            $contentDir = $getFolderContent($temporaryDir);
             $singleDirAtTopLevel = 1 === count($contentDir) && is_dir(reset($contentDir));
 
             if ($renameAsOne) {
@@ -89,28 +119,28 @@ abstract class ArchiveDownloader extends FileDownloader
                 } else {
                     $extractedDir = $temporaryDir;
                 }
-                $this->filesystem->rename($extractedDir, $path);
+                $filesystem->rename($extractedDir, $path);
             } else {
                 // only one dir in the archive, extract its contents out of it
                 if ($singleDirAtTopLevel) {
-                    $contentDir = $this->getFolderContent((string) reset($contentDir));
+                    $contentDir = $getFolderContent((string) reset($contentDir));
                 }
 
                 // move files back out of the temp dir
                 foreach ($contentDir as $file) {
                     $file = (string) $file;
-                    $this->filesystem->rename($file, $path . '/' . basename($file));
+                    $filesystem->rename($file, $path . '/' . basename($file));
                 }
             }
 
-            $this->filesystem->removeDirectory($temporaryDir);
-        } catch (\Exception $e) {
-            // clean up
-            $this->filesystem->removeDirectory($path);
-            $this->filesystem->removeDirectory($temporaryDir);
+            $filesystem->removeDirectory($temporaryDir);
+            $self->removeCleanupPath($package, $temporaryDir);
+            $self->removeCleanupPath($package, $path);
+        }, function ($e) use ($cleanup) {
+            $cleanup();
 
             throw $e;
-        }
+        });
     }
 
     /**
@@ -119,25 +149,8 @@ abstract class ArchiveDownloader extends FileDownloader
      * @param string $file Extracted file
      * @param string $path Directory
      *
+     * @return PromiseInterface|null
      * @throws \UnexpectedValueException If can not extract downloaded file to path
      */
     abstract protected function extract(PackageInterface $package, $file, $path);
-
-    /**
-     * Returns the folder content, excluding dotfiles
-     *
-     * @param  string         $dir Directory
-     * @return \SplFileInfo[]
-     */
-    private function getFolderContent($dir)
-    {
-        $finder = Finder::create()
-            ->ignoreVCS(false)
-            ->ignoreDotFiles(false)
-            ->notName('.DS_Store')
-            ->depth(0)
-            ->in($dir);
-
-        return iterator_to_array($finder);
-    }
 }

src/Composer/Downloader/DownloadManager.php

@@ -25,11 +25,17 @@ use React\Promise\PromiseInterface;
  */
 class DownloadManager
 {
+    /** @var IOInterface */
     private $io;
+    /** @var bool */
     private $preferDist = false;
+    /** @var bool */
     private $preferSource = false;
+    /** @var array<string, string> */
     private $packagePreferences = array();
+    /** @var Filesystem */
     private $filesystem;
+    /** @var array<string, DownloaderInterface> */
     private $downloaders = array();
 
     /**

src/Composer/Downloader/FileDownloader.php

@@ -18,6 +18,9 @@ use Composer\Factory;
 use Composer\IO\IOInterface;
 use Composer\IO\NullIO;
 use Composer\Package\Comparer\Comparer;
+use Composer\DependencyResolver\Operation\UpdateOperation;
+use Composer\DependencyResolver\Operation\InstallOperation;
+use Composer\DependencyResolver\Operation\UninstallOperation;
 use Composer\Package\PackageInterface;
 use Composer\Package\Version\VersionParser;
 use Composer\Plugin\PluginEvents;
@@ -27,7 +30,9 @@ use Composer\EventDispatcher\EventDispatcher;
 use Composer\Util\Filesystem;
 use Composer\Util\HttpDownloader;
 use Composer\Util\Url as UrlUtil;
+use Composer\Util\ProcessExecutor;
 use Composer\Downloader\TransportException;
+use React\Promise\PromiseInterface;
 
 /**
  * Base downloader for files
@@ -39,16 +44,25 @@ use Composer\Downloader\TransportException;
  */
 class FileDownloader implements DownloaderInterface, ChangeReportInterface
 {
+    /** @var IOInterface */
     protected $io;
+    /** @var Config */
     protected $config;
+    /** @var HttpDownloader */
     protected $httpDownloader;
+    /** @var Filesystem */
     protected $filesystem;
+    /** @var Cache */
     protected $cache;
+    /** @var EventDispatcher */
+    protected $eventDispatcher;
+    /** @var ProcessExecutor */
+    protected $process;
     /**
      * @private this is only public for php 5.3 support in closures
      */
     public $lastCacheWrites = array();
-    private $eventDispatcher;
+    private $additionalCleanupPaths = array();
 
     /**
      * Constructor.
@@ -60,14 +74,15 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
      * @param Cache            $cache           Cache instance
      * @param Filesystem       $filesystem      The filesystem
      */
-    public function __construct(IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $eventDispatcher = null, Cache $cache = null, Filesystem $filesystem = null)
+    public function __construct(IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $eventDispatcher = null, Cache $cache = null, Filesystem $filesystem = null, ProcessExecutor $process = null)
     {
         $this->io = $io;
         $this->config = $config;
         $this->eventDispatcher = $eventDispatcher;
         $this->httpDownloader = $httpDownloader;
-        $this->filesystem = $filesystem ?: new Filesystem();
         $this->cache = $cache;
+        $this->process = $process ?: new ProcessExecutor($io);
+        $this->filesystem = $filesystem ?: new Filesystem($this->process);
 
         if ($this->cache && $this->cache->gcIsNecessary()) {
             $this->cache->gc($config->get('cache-files-ttl'), $config->get('cache-files-maxsize'));
@@ -119,8 +134,9 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
             $url = reset($urls);
 
             if ($eventDispatcher) {
-                $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $httpDownloader, $url['processed']);
+                $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $httpDownloader, $url['processed'], 'package', $package);
                 $eventDispatcher->dispatch($preFileDownloadEvent->getName(), $preFileDownloadEvent);
+                $url['processed'] = $preFileDownloadEvent->getProcessedUrl();
             }
 
             $checksum = $package->getDistSha1Checksum();
@@ -252,6 +268,12 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
             $path,
         );
 
+        if (isset($this->additionalCleanupPaths[$package->getName()])) {
+            foreach ($this->additionalCleanupPaths[$package->getName()] as $path) {
+                $this->filesystem->remove($path);
+            }
+        }
+
         foreach ($dirsToCleanUp as $dir) {
             if (is_dir($dir) && $this->filesystem->isDirEmpty($dir)) {
                 $this->filesystem->removeDirectory($dir);
@@ -265,7 +287,7 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
     public function install(PackageInterface $package, $path, $output = true)
     {
         if ($output) {
-            $this->io->writeError("  - Installing <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>)");
+            $this->io->writeError("  - " . InstallOperation::format($package));
         }
 
         $this->filesystem->emptyDirectory($path);
@@ -285,22 +307,49 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
         }
     }
 
+    /**
+     * TODO mark private in v3
+     * @protected This is public due to PHP 5.3
+     */
+    public function addCleanupPath(PackageInterface $package, $path)
+    {
+        $this->additionalCleanupPaths[$package->getName()][] = $path;
+    }
+
+    /**
+     * TODO mark private in v3
+     * @protected This is public due to PHP 5.3
+     */
+    public function removeCleanupPath(PackageInterface $package, $path)
+    {
+        if (isset($this->additionalCleanupPaths[$package->getName()])) {
+            $idx = array_search($path, $this->additionalCleanupPaths[$package->getName()]);
+            if (false !== $idx) {
+                unset($this->additionalCleanupPaths[$package->getName()][$idx]);
+            }
+        }
+    }
+
     /**
      * {@inheritDoc}
      */
     public function update(PackageInterface $initial, PackageInterface $target, $path)
     {
-        $name = $target->getName();
-        $from = $initial->getFullPrettyVersion();
-        $to = $target->getFullPrettyVersion();
+        $this->io->writeError("  - " . UpdateOperation::format($initial, $target) . ": ", false);
 
-        $actionName = VersionParser::isUpgrade($initial->getVersion(), $target->getVersion()) ? 'Upgrading' : 'Downgrading';
-        $this->io->writeError("  - " . $actionName . " <info>" . $name . "</info> (<comment>" . $from . "</comment> => <comment>" . $to . "</comment>): ", false);
+        $promise = $this->remove($initial, $path, false);
+        if (!$promise instanceof PromiseInterface) {
+            $promise = \React\Promise\resolve();
+        }
+        $self = $this;
+        $io = $this->io;
 
-        $this->remove($initial, $path, false);
-        $this->install($target, $path, false);
+        return $promise->then(function () use ($self, $target, $path, $io) {
+            $promise = $self->install($target, $path, false);
+            $io->writeError('');
 
-        $this->io->writeError('');
+            return $promise;
+        });
     }
 
     /**
@@ -309,7 +358,7 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
     public function remove(PackageInterface $package, $path, $output = true)
     {
         if ($output) {
-            $this->io->writeError("  - Removing <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>)");
+            $this->io->writeError("  - " . UninstallOperation::format($package));
         }
         if (!$this->filesystem->removeDirectory($path)) {
             throw new \RuntimeException('Could not completely delete '.$path.', aborting.');
@@ -374,9 +423,14 @@ class FileDownloader implements DownloaderInterface, ChangeReportInterface
         $output = '';
 
         try {
-            $res = $this->download($package, $targetDir.'_compare', null, false);
+            if (is_dir($targetDir.'_compare')) {
+                $this->filesystem->removeDirectory($targetDir.'_compare');
+            }
+
+            $this->download($package, $targetDir.'_compare', null, false);
             $this->httpDownloader->wait();
-            $res = $this->install($package, $targetDir.'_compare', false);
+            $this->install($package, $targetDir.'_compare', false);
+            $this->process->wait();
 
             $comparer = new Comparer();
             $comparer->setSource($targetDir.'_compare');

src/Composer/Downloader/GitDownloader.php

@@ -495,7 +495,7 @@ class GitDownloader extends VcsDownloader implements DvcsDownloaderInterface
     protected function discardChanges($path)
     {
         $path = $this->normalizePath($path);
-        if (0 !== $this->process->execute('git reset --hard', $output, $path)) {
+        if (0 !== $this->process->execute('git clean -df && git reset --hard', $output, $path)) {
             throw new \RuntimeException("Could not reset changes\n\n:".$this->process->getErrorOutput());
         }
 

src/Composer/Downloader/GzipDownloader.php

@@ -20,6 +20,7 @@ use Composer\Util\Platform;
 use Composer\Util\ProcessExecutor;
 use Composer\Util\HttpDownloader;
 use Composer\IO\IOInterface;
+use Composer\Util\Filesystem;
 
 /**
  * GZip archive downloader.
@@ -28,15 +29,6 @@ use Composer\IO\IOInterface;
  */
 class GzipDownloader extends ArchiveDownloader
 {
-    /** @var ProcessExecutor */
-    protected $process;
-
-    public function __construct(IOInterface $io, Config $config, HttpDownloader $downloader, EventDispatcher $eventDispatcher = null, Cache $cache = null, ProcessExecutor $process = null)
-    {
-        $this->process = $process ?: new ProcessExecutor($io);
-        parent::__construct($io, $config, $downloader, $eventDispatcher, $cache);
-    }
-
     protected function extract(PackageInterface $package, $file, $path)
     {
         $filename = pathinfo(parse_url($package->getDistUrl(), PHP_URL_PATH), PATHINFO_FILENAME);

src/Composer/Downloader/PathDownloader.php

@@ -18,10 +18,18 @@ use Composer\Package\PackageInterface;
 use Composer\Package\Version\VersionGuesser;
 use Composer\Package\Version\VersionParser;
 use Composer\Util\Platform;
+use Composer\IO\IOInterface;
+use Composer\Config;
+use Composer\Cache;
+use Composer\Util\HttpDownloader;
 use Composer\Util\ProcessExecutor;
-use Composer\Util\Filesystem as ComposerFilesystem;
+use Composer\Util\Filesystem;
+use Composer\EventDispatcher\EventDispatcher;
 use Symfony\Component\Filesystem\Exception\IOException;
-use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Filesystem\Filesystem as SymfonyFilesystem;
+use Composer\DependencyResolver\Operation\UpdateOperation;
+use Composer\DependencyResolver\Operation\InstallOperation;
+use Composer\DependencyResolver\Operation\UninstallOperation;
 
 /**
  * Download a package from a local path.
@@ -77,11 +85,7 @@ class PathDownloader extends FileDownloader implements VcsCapableDownloaderInter
 
         if (realpath($path) === $realUrl) {
             if ($output) {
-                $this->io->writeError(sprintf(
-                    '  - Installing <info>%s</info> (<comment>%s</comment>): Source already present',
-                    $package->getName(),
-                    $package->getFullPrettyVersion()
-                ));
+                $this->io->writeError("  - " . InstallOperation::format($package).': Source already present');
             } else {
                 $this->io->writeError('Source already present', false);
             }
@@ -115,15 +119,11 @@ class PathDownloader extends FileDownloader implements VcsCapableDownloaderInter
             $allowedStrategies = array(self::STRATEGY_MIRROR);
         }
 
-        $fileSystem = new Filesystem();
+        $symfonyFilesystem = new SymfonyFilesystem();
         $this->filesystem->removeDirectory($path);
 
         if ($output) {
-            $this->io->writeError(sprintf(
-                '  - Installing <info>%s</info> (<comment>%s</comment>): ',
-                $package->getName(),
-                $package->getFullPrettyVersion()
-            ), false);
+            $this->io->writeError("  - " . InstallOperation::format($package).': ', false);
         }
 
         $isFallback = false;
@@ -142,9 +142,9 @@ class PathDownloader extends FileDownloader implements VcsCapableDownloaderInter
                     $path = rtrim($path, "/");
                     $this->io->writeError(sprintf('Symlinking from %s', $url), false);
                     if ($transportOptions['relative']) {
-                        $fileSystem->symlink($shortestPath, $path);
+                        $symfonyFilesystem->symlink($shortestPath, $path);
                     } else {
-                        $fileSystem->symlink($realUrl, $path);
+                        $symfonyFilesystem->symlink($realUrl, $path);
                     }
                 }
             } catch (IOException $e) {
@@ -161,12 +161,11 @@ class PathDownloader extends FileDownloader implements VcsCapableDownloaderInter
 
         // Fallback if symlink failed or if symlink is not allowed for the package
         if (self::STRATEGY_MIRROR == $currentStrategy) {
-            $fs = new ComposerFilesystem();
-            $realUrl = $fs->normalizePath($realUrl);
+            $realUrl = $this->filesystem->normalizePath($realUrl);
 
             $this->io->writeError(sprintf('%sMirroring from %s', $isFallback ? '    ' : '', $url), false);
             $iterator = new ArchivableFilesFinder($realUrl, array());
-            $fileSystem->mirror($realUrl, $path, $iterator);
+            $symfonyFilesystem->mirror($realUrl, $path, $iterator);
         }
 
         if ($output) {
@@ -183,7 +182,7 @@ class PathDownloader extends FileDownloader implements VcsCapableDownloaderInter
 
         if ($path === $realUrl) {
             if ($output) {
-                $this->io->writeError("  - Removing <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>), source is still present in $path");
+                $this->io->writeError("  - " . UninstallOperation::format($package).", source is still present in $path");
             }
 
             return;
@@ -196,7 +195,7 @@ class PathDownloader extends FileDownloader implements VcsCapableDownloaderInter
          */
         if (Platform::isWindows() && $this->filesystem->isJunction($path)) {
             if ($output) {
-                $this->io->writeError("  - Removing junction for <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>)");
+                $this->io->writeError("  - " . UninstallOperation::format($package).", source is still present in $path");
             }
             if (!$this->filesystem->removeJunction($path)) {
                 $this->io->writeError("    <warning>Could not remove junction at " . $path . " - is another process locking it?</warning>");
@@ -213,7 +212,7 @@ class PathDownloader extends FileDownloader implements VcsCapableDownloaderInter
     public function getVcsReference(PackageInterface $package, $path)
     {
         $parser = new VersionParser;
-        $guesser = new VersionGuesser($this->config, new ProcessExecutor($this->io), $parser);
+        $guesser = new VersionGuesser($this->config, $this->process, $parser);
         $dumper = new ArrayDumper;
 
         $packageConfig = $dumper->dump($package);

src/Composer/Downloader/RarDownloader.php

@@ -19,6 +19,7 @@ use Composer\Util\IniHelper;
 use Composer\Util\Platform;
 use Composer\Util\ProcessExecutor;
 use Composer\Util\HttpDownloader;
+use Composer\Util\Filesystem;
 use Composer\IO\IOInterface;
 use Composer\Package\PackageInterface;
 use RarArchive;
@@ -32,15 +33,6 @@ use RarArchive;
  */
 class RarDownloader extends ArchiveDownloader
 {
-    /** @var ProcessExecutor */
-    protected $process;
-
-    public function __construct(IOInterface $io, Config $config, HttpDownloader $downloader, EventDispatcher $eventDispatcher = null, Cache $cache = null, ProcessExecutor $process = null)
-    {
-        $this->process = $process ?: new ProcessExecutor($io);
-        parent::__construct($io, $config, $downloader, $eventDispatcher, $cache);
-    }
-
     protected function extract(PackageInterface $package, $file, $path)
     {
         $processError = null;

src/Composer/Downloader/SvnDownloader.php

@@ -65,7 +65,7 @@ class SvnDownloader extends VcsDownloader
             throw new \RuntimeException('The .svn directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
         }
 
-        $util = new SvnUtil($url, $this->io, $this->config);
+        $util = new SvnUtil($url, $this->io, $this->config, $this->process);
         $flags = "";
         if (version_compare($util->binaryVersion(), '1.7.0', '>=')) {
             $flags .= ' --ignore-ancestry';
@@ -103,7 +103,7 @@ class SvnDownloader extends VcsDownloader
      */
     protected function execute(PackageInterface $package, $baseUrl, $command, $url, $cwd = null, $path = null)
     {
-        $util = new SvnUtil($baseUrl, $this->io, $this->config);
+        $util = new SvnUtil($baseUrl, $this->io, $this->config, $this->process);
         $util->setCacheCredentials($this->cacheCredentials);
         try {
             return $util->execute($command, $url, $cwd, $path, $this->io->isVerbose());
@@ -202,7 +202,7 @@ class SvnDownloader extends VcsDownloader
 
             $command = sprintf('svn log -r%s:%s --incremental', ProcessExecutor::escape($fromRevision), ProcessExecutor::escape($toRevision));
 
-            $util = new SvnUtil($baseUrl, $this->io, $this->config);
+            $util = new SvnUtil($baseUrl, $this->io, $this->config, $this->process);
             $util->setCacheCredentials($this->cacheCredentials);
             try {
                 return $util->executeLocal($command, $path, null, $this->io->isVerbose());

src/Composer/Downloader/VcsDownloader.php

@@ -21,6 +21,9 @@ use Composer\Util\ProcessExecutor;
 use Composer\IO\IOInterface;
 use Composer\Util\Filesystem;
 use React\Promise\PromiseInterface;
+use Composer\DependencyResolver\Operation\UpdateOperation;
+use Composer\DependencyResolver\Operation\InstallOperation;
+use Composer\DependencyResolver\Operation\UninstallOperation;
 
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
@@ -120,7 +123,7 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
             throw new \InvalidArgumentException('Package '.$package->getPrettyName().' is missing reference information');
         }
 
-        $this->io->writeError("  - Installing <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>): ", false);
+        $this->io->writeError("  - " . InstallOperation::format($package).': ', false);
 
         $urls = $this->prepareUrls($package->getSourceUrls());
         while ($url = array_shift($urls)) {
@@ -153,23 +156,7 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
             throw new \InvalidArgumentException('Package '.$target->getPrettyName().' is missing reference information');
         }
 
-        $name = $target->getName();
-        if ($initial->getPrettyVersion() == $target->getPrettyVersion()) {
-            if ($target->getSourceType() === 'svn') {
-                $from = $initial->getSourceReference();
-                $to = $target->getSourceReference();
-            } else {
-                $from = substr($initial->getSourceReference(), 0, 7);
-                $to = substr($target->getSourceReference(), 0, 7);
-            }
-            $name .= ' '.$initial->getPrettyVersion();
-        } else {
-            $from = $initial->getFullPrettyVersion();
-            $to = $target->getFullPrettyVersion();
-        }
-
-        $actionName = VersionParser::isUpgrade($initial->getVersion(), $target->getVersion()) ? 'Upgrading' : 'Downgrading';
-        $this->io->writeError("  - " . $actionName . " <info>" . $name . "</info> (<comment>" . $from . "</comment> => <comment>" . $to . "</comment>): ", false);
+        $this->io->writeError("  - " . UpdateOperation::format($initial, $target).': ', false);
 
         $urls = $this->prepareUrls($target->getSourceUrls());
 
@@ -227,7 +214,7 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
      */
     public function remove(PackageInterface $package, $path)
     {
-        $this->io->writeError("  - Removing <info>" . $package->getName() . "</info> (<comment>" . $package->getPrettyVersion() . "</comment>)");
+        $this->io->writeError("  - " . UninstallOperation::format($package));
         if (!$this->filesystem->removeDirectory($path)) {
             throw new \RuntimeException('Could not completely delete '.$path.', aborting.');
         }

src/Composer/Downloader/XzDownloader.php

@@ -19,6 +19,7 @@ use Composer\Package\PackageInterface;
 use Composer\Util\ProcessExecutor;
 use Composer\Util\HttpDownloader;
 use Composer\IO\IOInterface;
+use Composer\Util\Filesystem;
 
 /**
  * Xz archive downloader.
@@ -28,16 +29,6 @@ use Composer\IO\IOInterface;
  */
 class XzDownloader extends ArchiveDownloader
 {
-    /** @var ProcessExecutor */
-    protected $process;
-
-    public function __construct(IOInterface $io, Config $config, HttpDownloader $downloader, EventDispatcher $eventDispatcher = null, Cache $cache = null, ProcessExecutor $process = null)
-    {
-        $this->process = $process ?: new ProcessExecutor($io);
-
-        parent::__construct($io, $config, $downloader, $eventDispatcher, $cache);
-    }
-
     protected function extract(PackageInterface $package, $file, $path)
     {
         $command = 'tar -xJf ' . ProcessExecutor::escape($file) . ' -C ' . ProcessExecutor::escape($path);

src/Composer/Downloader/ZipDownloader.php

@@ -19,6 +19,7 @@ use Composer\Package\PackageInterface;
 use Composer\Util\IniHelper;
 use Composer\Util\Platform;
 use Composer\Util\ProcessExecutor;
+use Composer\Util\Filesystem;
 use Composer\Util\HttpDownloader;
 use Composer\IO\IOInterface;
 use Symfony\Component\Process\ExecutableFinder;
@@ -33,17 +34,9 @@ class ZipDownloader extends ArchiveDownloader
     private static $hasZipArchive;
     private static $isWindows;
 
-    /** @var ProcessExecutor */
-    protected $process;
     /** @var ZipArchive|null */
     private $zipArchiveObject;
 
-    public function __construct(IOInterface $io, Config $config, HttpDownloader $downloader, EventDispatcher $eventDispatcher = null, Cache $cache = null, ProcessExecutor $process = null)
-    {
-        $this->process = $process ?: new ProcessExecutor($io);
-        parent::__construct($io, $config, $downloader, $eventDispatcher, $cache);
-    }
-
     /**
      * {@inheritDoc}
      */
@@ -85,9 +78,8 @@ class ZipDownloader extends ArchiveDownloader
      * @param  string $file         File to extract
      * @param  string $path         Path where to extract file
      * @param  bool   $isLastChance If true it is called as a fallback and should throw an exception
-     * @return bool   Success status
      */
-    protected function extractWithSystemUnzip($file, $path, $isLastChance)
+    private function extractWithSystemUnzip(PackageInterface $package, $file, $path, $isLastChance, $async = false)
     {
         if (!self::$hasZipArchive) {
             // Force Exception throwing if the Other alternative is not available
@@ -97,18 +89,56 @@ class ZipDownloader extends ArchiveDownloader
         if (!self::$hasSystemUnzip && !$isLastChance) {
             // This was call as the favorite extract way, but is not available
             // We switch to the alternative
-            return $this->extractWithZipArchive($file, $path, true);
+            return $this->extractWithZipArchive($package, $file, $path, true);
+        }
+
+        // When called after a ZipArchive failed, perhaps there is some files to overwrite
+        $overwrite = $isLastChance ? '-o' : '';
+        $command = 'unzip -qq '.$overwrite.' '.ProcessExecutor::escape($file).' -d '.ProcessExecutor::escape($path);
+
+        if ($async) {
+            $self = $this;
+            $io = $this->io;
+            $tryFallback = function ($processError) use ($isLastChance, $io, $self, $file, $path, $package) {
+                if ($isLastChance) {
+                    throw $processError;
+                }
+
+                if (!is_file($file)) {
+                    $io->writeError('    <warning>'.$processError->getMessage().'</warning>');
+                    $io->writeError('    <warning>This most likely is due to a custom installer plugin not handling the returned Promise from the downloader</warning>');
+                    $io->writeError('    <warning>See https://github.com/composer/installers/commit/5006d0c28730ade233a8f42ec31ac68fb1c5c9bb for an example fix</warning>');
+                } else {
+                    $io->writeError('    <warning>'.$processError->getMessage().'</warning>');
+                    $io->writeError('    The archive may contain identical file names with different capitalization (which fails on case insensitive filesystems)');
+                    $io->writeError('    Unzip with unzip command failed, falling back to ZipArchive class');
+                }
+
+                return $self->extractWithZipArchive($package, $file, $path, true);
+            };
+
+            try {
+                $promise = $this->process->executeAsync($command);
+
+                return $promise->then(function ($process) use ($tryFallback, $command, $package, $file) {
+                    if (!$process->isSuccessful()) {
+                        $output = $process->getErrorOutput();
+                        $output = str_replace(', '.$file.'.zip or '.$file.'.ZIP', '', $output);
+
+                        return $tryFallback(new \RuntimeException('Failed to extract '.$package->getName().': ('.$process->getExitCode().') '.$command."\n\n".$output));
+                    }
+                });
+            } catch (\Exception $e) {
+                return $tryFallback($e);
+            } catch (\Throwable $e) {
+                return $tryFallback($e);
+            }
         }
 
         $processError = null;
-        // When called after a ZipArchive failed, perhaps there is some files to overwrite
-        $overwrite = $isLastChance ? '-o' : '';
-
-        $command = 'unzip -qq '.$overwrite.' '.ProcessExecutor::escape($file).' -d '.ProcessExecutor::escape($path);
-
         try {
             if (0 === $exitCode = $this->process->execute($command, $ignoredOutput)) {
-                return true;
+                return \React\Promise\resolve();
             }
 
             $processError = new \RuntimeException('Failed to execute ('.$exitCode.') '.$command."\n\n".$this->process->getErrorOutput());
@@ -120,11 +150,11 @@ class ZipDownloader extends ArchiveDownloader
             throw $processError;
         }
 
-        $this->io->writeError('    '.$processError->getMessage());
+        $this->io->writeError('    <warning>'.$processError->getMessage().'</warning>');
         $this->io->writeError('    The archive may contain identical file names with different capitalization (which fails on case insensitive filesystems)');
         $this->io->writeError('    Unzip with unzip command failed, falling back to ZipArchive class');
 
-        return $this->extractWithZipArchive($file, $path, true);
+        return $this->extractWithZipArchive($package, $file, $path, true);
     }
 
     /**
@@ -133,9 +163,11 @@ class ZipDownloader extends ArchiveDownloader
      * @param  string $file         File to extract
      * @param  string $path         Path where to extract file
      * @param  bool   $isLastChance If true it is called as a fallback and should throw an exception
-     * @return bool   Success status
+     *
+     * TODO v3 should make this private once we can drop PHP 5.3 support
+     * @protected
      */
-    protected function extractWithZipArchive($file, $path, $isLastChance)
+    public function extractWithZipArchive(PackageInterface $package, $file, $path, $isLastChance)
     {
         if (!self::$hasSystemUnzip) {
             // Force Exception throwing if the Other alternative is not available
@@ -145,7 +177,7 @@ class ZipDownloader extends ArchiveDownloader
         if (!self::$hasZipArchive && !$isLastChance) {
             // This was call as the favorite extract way, but is not available
             // We switch to the alternative
-            return $this->extractWithSystemUnzip($file, $path, true);
+            return $this->extractWithSystemUnzip($package, $file, $path, true);
         }
 
         $processError = null;
@@ -158,7 +190,7 @@ class ZipDownloader extends ArchiveDownloader
                 if (true === $extractResult) {
                     $zipArchive->close();
 
-                    return true;
+                    return \React\Promise\resolve();
                 }
 
                 $processError = new \RuntimeException(rtrim("There was an error extracting the ZIP file, it is either corrupted or using an invalid format.\n"));
@@ -169,16 +201,18 @@ class ZipDownloader extends ArchiveDownloader
             $processError = new \RuntimeException('The archive may contain identical file names with different capitalization (which fails on case insensitive filesystems): '.$e->getMessage(), 0, $e);
         } catch (\Exception $e) {
             $processError = $e;
+        } catch (\Throwable $e) {
+            $processError = $e;
         }
 
         if ($isLastChance) {
             throw $processError;
         }
 
-        $this->io->writeError('    '.$processError->getMessage());
+        $this->io->writeError('    <warning>'.$processError->getMessage().'</warning>');
         $this->io->writeError('    Unzip with ZipArchive class failed, falling back to unzip command');
 
-        return $this->extractWithSystemUnzip($file, $path, true);
+        return $this->extractWithSystemUnzip($package, $file, $path, true);
     }
 
     /**
@@ -191,10 +225,10 @@ class ZipDownloader extends ArchiveDownloader
     {
         // Each extract calls its alternative if not available or fails
         if (self::$isWindows) {
-            $this->extractWithZipArchive($file, $path, false);
-        } else {
-            $this->extractWithSystemUnzip($file, $path, false);
+            return $this->extractWithZipArchive($package, $file, $path, false);
         }
+
+        return $this->extractWithSystemUnzip($package, $file, $path, false, true);
     }
 
     /**

src/Composer/EventDispatcher/EventDispatcher.php

@@ -28,6 +28,7 @@ use Composer\Installer\PackageEvent;
 use Composer\Installer\BinaryInstaller;
 use Composer\Util\ProcessExecutor;
 use Composer\Script\Event as ScriptEvent;
+use Composer\ClassLoader;
 use Symfony\Component\Process\PhpExecutableFinder;
 
 /**
@@ -45,11 +46,17 @@ use Symfony\Component\Process\PhpExecutableFinder;
  */
 class EventDispatcher
 {
+    /** @var Composer */
     protected $composer;
+    /** @var IOInterface */
     protected $io;
+    /** @var ?ClassLoader */
     protected $loader;
+    /** @var ProcessExecutor */
     protected $process;
+    /** @var array<string, array<int, array<callable|string>>> */
     protected $listeners = array();
+    /** @var list<string> */
     private $eventStack;
 
     /**

src/Composer/Factory.php

@@ -335,15 +335,16 @@ class Factory
         }
 
         $httpDownloader = self::createHttpDownloader($io, $config);
-        $loop = new Loop($httpDownloader);
+        $process = new ProcessExecutor($io);
+        $loop = new Loop($httpDownloader, $process);
         $composer->setLoop($loop);
 
         // initialize event dispatcher
-        $dispatcher = new EventDispatcher($composer, $io);
+        $dispatcher = new EventDispatcher($composer, $io, $process);
         $composer->setEventDispatcher($dispatcher);
 
         // initialize repository manager
-        $rm = RepositoryFactory::manager($io, $config, $httpDownloader, $dispatcher);
+        $rm = RepositoryFactory::manager($io, $config, $httpDownloader, $dispatcher, $process);
         $composer->setRepositoryManager($rm);
 
         // force-set the version of the global package if not defined as
@@ -354,7 +355,7 @@ class Factory
 
         // load package
         $parser = new VersionParser;
-        $guesser = new VersionGuesser($config, new ProcessExecutor($io), $parser);
+        $guesser = new VersionGuesser($config, $process, $parser);
         $loader = new Package\Loader\RootPackageLoader($rm, $config, $parser, $guesser, $io);
         $package = $loader->load($localConfig, 'Composer\Package\RootPackage', $cwd);
         $composer->setPackage($package);
@@ -368,7 +369,7 @@ class Factory
 
         if ($fullLoad) {
             // initialize download manager
-            $dm = $this->createDownloadManager($io, $config, $httpDownloader, $dispatcher);
+            $dm = $this->createDownloadManager($io, $config, $httpDownloader, $process, $dispatcher);
             $composer->setDownloadManager($dm);
 
             // initialize autoload generator
@@ -381,7 +382,7 @@ class Factory
         }
 
         // add installers to the manager (must happen after download manager is created since they read it out of $composer)
-        $this->createDefaultInstallers($im, $composer, $io);
+        $this->createDefaultInstallers($im, $composer, $io, $process);
 
         if ($fullLoad) {
             $globalComposer = null;
@@ -399,7 +400,7 @@ class Factory
         if ($fullLoad && isset($composerFile)) {
             $lockFile = self::getLockFile($composerFile);
 
-            $locker = new Package\Locker($io, new JsonFile($lockFile, null, $io), $im, file_get_contents($composerFile));
+            $locker = new Package\Locker($io, new JsonFile($lockFile, null, $io), $im, file_get_contents($composerFile), $process);
             $composer->setLocker($locker);
         }
 
@@ -460,14 +461,16 @@ class Factory
      * @param  EventDispatcher            $eventDispatcher
      * @return Downloader\DownloadManager
      */
-    public function createDownloadManager(IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $eventDispatcher = null)
+    public function createDownloadManager(IOInterface $io, Config $config, HttpDownloader $httpDownloader, ProcessExecutor $process, EventDispatcher $eventDispatcher = null)
     {
         $cache = null;
         if ($config->get('cache-files-ttl') > 0) {
             $cache = new Cache($io, $config->get('cache-files-dir'), 'a-z0-9_./');
         }
 
-        $dm = new Downloader\DownloadManager($io);
+        $fs = new Filesystem($process);
+
+        $dm = new Downloader\DownloadManager($io, false, $fs);
         switch ($preferred = $config->get('preferred-install')) {
             case 'dist':
                 $dm->setPreferDist(true);
@@ -485,22 +488,19 @@ class Factory
             $dm->setPreferences($preferred);
         }
 
-        $executor = new ProcessExecutor($io);
-        $fs = new Filesystem($executor);
-
-        $dm->setDownloader('git', new Downloader\GitDownloader($io, $config, $executor, $fs));
-        $dm->setDownloader('svn', new Downloader\SvnDownloader($io, $config, $executor, $fs));
-        $dm->setDownloader('fossil', new Downloader\FossilDownloader($io, $config, $executor, $fs));
-        $dm->setDownloader('hg', new Downloader\HgDownloader($io, $config, $executor, $fs));
-        $dm->setDownloader('perforce', new Downloader\PerforceDownloader($io, $config));
-        $dm->setDownloader('zip', new Downloader\ZipDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $executor));
-        $dm->setDownloader('rar', new Downloader\RarDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $executor));
-        $dm->setDownloader('tar', new Downloader\TarDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache));
-        $dm->setDownloader('gzip', new Downloader\GzipDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $executor));
-        $dm->setDownloader('xz', new Downloader\XzDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $executor));
-        $dm->setDownloader('phar', new Downloader\PharDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache));
-        $dm->setDownloader('file', new Downloader\FileDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache));
-        $dm->setDownloader('path', new Downloader\PathDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache));
+        $dm->setDownloader('git', new Downloader\GitDownloader($io, $config, $process, $fs));
+        $dm->setDownloader('svn', new Downloader\SvnDownloader($io, $config, $process, $fs));
+        $dm->setDownloader('fossil', new Downloader\FossilDownloader($io, $config, $process, $fs));
+        $dm->setDownloader('hg', new Downloader\HgDownloader($io, $config, $process, $fs));
+        $dm->setDownloader('perforce', new Downloader\PerforceDownloader($io, $config, $process, $fs));
+        $dm->setDownloader('zip', new Downloader\ZipDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
+        $dm->setDownloader('rar', new Downloader\RarDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
+        $dm->setDownloader('tar', new Downloader\TarDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
+        $dm->setDownloader('gzip', new Downloader\GzipDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
+        $dm->setDownloader('xz', new Downloader\XzDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
+        $dm->setDownloader('phar', new Downloader\PharDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
+        $dm->setDownloader('file', new Downloader\FileDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
+        $dm->setDownloader('path', new Downloader\PathDownloader($io, $config, $httpDownloader, $eventDispatcher, $cache, $fs, $process));
 
         return $dm;
     }
@@ -544,10 +544,13 @@ class Factory
      * @param Composer                      $composer
      * @param IO\IOInterface                $io
      */
-    protected function createDefaultInstallers(Installer\InstallationManager $im, Composer $composer, IOInterface $io)
+    protected function createDefaultInstallers(Installer\InstallationManager $im, Composer $composer, IOInterface $io, ProcessExecutor $process = null)
     {
-        $im->addInstaller(new Installer\LibraryInstaller($io, $composer, null));
-        $im->addInstaller(new Installer\PluginInstaller($io, $composer));
+        $fs = new Filesystem($process);
+        $binaryInstaller = new Installer\BinaryInstaller($io, rtrim($composer->getConfig()->get('bin-dir'), '/'), $composer->getConfig()->get('bin-compat'), $fs);
+
+        $im->addInstaller(new Installer\LibraryInstaller($io, $composer, null, $fs, $binaryInstaller));
+        $im->addInstaller(new Installer\PluginInstaller($io, $composer, $fs, $binaryInstaller));
         $im->addInstaller(new Installer\MetapackageInstaller($io));
     }
 

src/Composer/IO/ConsoleIO.php

@@ -14,6 +14,7 @@ namespace Composer\IO;
 
 use Composer\Question\StrictConfirmationQuestion;
 use Symfony\Component\Console\Helper\HelperSet;
+use Symfony\Component\Console\Helper\ProgressBar;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -253,6 +254,15 @@ class ConsoleIO extends BaseIO
         }
     }
 
+    /**
+     * @param int $max
+     * @return ProgressBar
+     */
+    public function getProgressBar($max = 0)
+    {
+        return new ProgressBar($this->getErrorOutput(), $max);
+    }
+
     /**
      * {@inheritDoc}
      */

src/Composer/Installer.php

@@ -226,7 +226,7 @@ class Installer
         }
 
         if ($this->runScripts) {
-            $_SERVER['COMPOSER_DEV_MODE'] = (int) $this->devMode;
+            $_SERVER['COMPOSER_DEV_MODE'] = $this->devMode ? '1' : '0';
             putenv('COMPOSER_DEV_MODE='.$_SERVER['COMPOSER_DEV_MODE']);
 
             // dispatch pre event
@@ -685,7 +685,7 @@ class Installer
         }
 
         if ($this->executeOperations) {
-            $this->installationManager->execute($localRepo, $localRepoTransaction->getOperations(), $this->devMode);
+            $this->installationManager->execute($localRepo, $localRepoTransaction->getOperations(), $this->devMode, $this->runScripts);
         } else {
             foreach ($localRepoTransaction->getOperations() as $operation) {
                 // output op, but alias op only in debug verbosity

src/Composer/Installer/InstallationManager.php

@@ -13,6 +13,7 @@
 namespace Composer\Installer;
 
 use Composer\IO\IOInterface;
+use Composer\IO\ConsoleIO;
 use Composer\Package\PackageInterface;
 use Composer\Package\AliasPackage;
 use Composer\Repository\RepositoryInterface;
@@ -26,6 +27,7 @@ use Composer\DependencyResolver\Operation\MarkAliasUninstalledOperation;
 use Composer\EventDispatcher\EventDispatcher;
 use Composer\Util\StreamContextFactory;
 use Composer\Util\Loop;
+use React\Promise\PromiseInterface;
 
 /**
  * Package operation manager.
@@ -36,12 +38,20 @@ use Composer\Util\Loop;
  */
 class InstallationManager
 {
+    /** @var array<InstallerInterface> */
     private $installers = array();
+    /** @var array<string, InstallerInterface> */
     private $cache = array();
+    /** @var array<string, array<PackageInterface>> */
     private $notifiablePackages = array();
+    /** @var Loop */
     private $loop;
+    /** @var IOInterface */
     private $io;
+    /** @var EventDispatcher */
     private $eventDispatcher;
+    /** @var bool */
+    private $outputProgress;
 
     public function __construct(Loop $loop, IOInterface $io, EventDispatcher $eventDispatcher = null)
     {
@@ -166,7 +176,7 @@ class InstallationManager
      * @param RepositoryInterface  $repo       repository in which to add/remove/update packages
      * @param OperationInterface[] $operations operations to execute
      * @param bool                 $devMode    whether the install is being run in dev mode
-     * @param bool                 $operation  whether to dispatch script events
+     * @param bool                 $runScripts whether to dispatch script events
      */
     public function execute(RepositoryInterface $repo, array $operations, $devMode = true, $runScripts = true)
     {
@@ -177,10 +187,12 @@ class InstallationManager
         $runCleanup = function () use (&$cleanupPromises, $loop) {
             $promises = array();
 
+            $loop->abortJobs();
+
             foreach ($cleanupPromises as $cleanup) {
                 $promises[] = new \React\Promise\Promise(function ($resolve, $reject) use ($cleanup) {
                     $promise = $cleanup();
-                    if (null === $promise) {
+                    if (!$promise instanceof PromiseInterface) {
                         $resolve();
                     } else {
                         $promise->then(function () use ($resolve) {
@@ -259,9 +271,73 @@ class InstallationManager
 
             // execute all downloads first
             if (!empty($promises)) {
-                $this->loop->wait($promises);
+                $progress = null;
+                if ($this->outputProgress && $this->io instanceof ConsoleIO && !$this->io->isDebug() && count($promises) > 1) {
+                    $progress = $this->io->getProgressBar();
+                }
+                $this->loop->wait($promises, $progress);
+                if ($progress) {
+                    $progress->clear();
+                }
             }
 
+            // execute operations in batches to make sure every plugin is installed in the
+            // right order and activated before the packages depending on it are installed
+            $batches = array();
+            $batch = array();
+            foreach ($operations as $index => $operation) {
+                if (in_array($operation->getOperationType(), array('update', 'install'), true)) {
+                    $package = $operation->getOperationType() === 'update' ? $operation->getTargetPackage() : $operation->getPackage();
+                    if ($package->getType() === 'composer-plugin' || $package->getType() === 'composer-installer') {
+                        if ($batch) {
+                            $batches[] = $batch;
+                        }
+                        unset($operations[$index]);
+                        $batches[] = array($index => $operation);
+                        $batch = array();
+
+                        continue;
+                    }
+                }
+                unset($operations[$index]);
+                $batch[$index] = $operation;
+            }
+
+            if ($batch) {
+                $batches[] = $batch;
+            }
+
+            foreach ($batches as $batch) {
+                $this->executeBatch($repo, $batch, $cleanupPromises, $devMode, $runScripts);
+            }
+        } catch (\Exception $e) {
+            $runCleanup();
+
+            if ($handleInterruptsUnix) {
+                pcntl_signal(SIGINT, $prevHandler);
+            }
+            if ($handleInterruptsWindows) {
+                sapi_windows_set_ctrl_handler($prevHandler, false);
+            }
+
+            throw $e;
+        }
+
+        if ($handleInterruptsUnix) {
+            pcntl_signal(SIGINT, $prevHandler);
+        }
+        if ($handleInterruptsWindows) {
+            sapi_windows_set_ctrl_handler($prevHandler, false);
+        }
+
+        // do a last write so that we write the repository even if nothing changed
+        // as that can trigger an update of some files like InstalledVersions.php if
+        // running a new composer version
+        $repo->write($devMode, $this);
+    }
+
+    private function executeBatch(RepositoryInterface $repo, array $operations, array $cleanupPromises, $devMode, $runScripts)
+    {
         foreach ($operations as $index => $operation) {
             $opType = $operation->getOperationType();
 
@@ -292,12 +368,11 @@ class InstallationManager
 
             $dispatcher = $this->eventDispatcher;
             $installManager = $this;
-                $loop = $this->loop;
             $io = $this->io;
 
             $promise = $installer->prepare($opType, $package, $initialPackage);
-                if (null === $promise) {
-                    $promise = new \React\Promise\Promise(function ($resolve, $reject) { $resolve(); });
+            if (!$promise instanceof PromiseInterface) {
+                $promise = \React\Promise\resolve();
             }
 
             $promise = $promise->then(function () use ($opType, $installManager, $repo, $operation) {
@@ -321,32 +396,15 @@ class InstallationManager
 
         // execute all prepare => installs/updates/removes => cleanup steps
         if (!empty($promises)) {
-                $this->loop->wait($promises);
+            $progress = null;
+            if ($this->outputProgress && $this->io instanceof ConsoleIO && !$this->io->isDebug() && count($promises) > 1) {
+                $progress = $this->io->getProgressBar();
             }
-        } catch (\Exception $e) {
-            $runCleanup();
-
-            if ($handleInterruptsUnix) {
-                pcntl_signal(SIGINT, $prevHandler);
+            $this->loop->wait($promises, $progress);
+            if ($progress) {
+                $progress->clear();
             }
-            if ($handleInterruptsWindows) {
-                sapi_windows_set_ctrl_handler($prevHandler, false);
         }
-
-            throw $e;
-        }
-
-        if ($handleInterruptsUnix) {
-            pcntl_signal(SIGINT, $prevHandler);
-        }
-        if ($handleInterruptsWindows) {
-            sapi_windows_set_ctrl_handler($prevHandler, false);
-        }
-
-        // do a last write so that we write the repository even if nothing changed
-        // as that can trigger an update of some files like InstalledVersions.php if
-        // running a new composer version
-        $repo->write($devMode, $this);
     }
 
     /**
@@ -447,6 +505,11 @@ class InstallationManager
         return $installer->getInstallPath($package);
     }
 
+    public function setOutputProgress($outputProgress)
+    {
+        $this->outputProgress = $outputProgress;
+    }
+
     public function notifyInstalls(IOInterface $io)
     {
         foreach ($this->notifiablePackages as $repoUrl => $packages) {

src/Composer/Installer/LibraryInstaller.php

@@ -19,6 +19,7 @@ use Composer\Package\PackageInterface;
 use Composer\Util\Filesystem;
 use Composer\Util\Silencer;
 use Composer\Util\Platform;
+use React\Promise\PromiseInterface;
 
 /**
  * Package installation manager.
@@ -131,11 +132,19 @@ class LibraryInstaller implements InstallerInterface, BinaryPresenceInterface
             $this->binaryInstaller->removeBinaries($package);
         }
 
-        $this->installCode($package);
-        $this->binaryInstaller->installBinaries($package, $this->getInstallPath($package));
+        $promise = $this->installCode($package);
+        if (!$promise instanceof PromiseInterface) {
+            $promise = \React\Promise\resolve();
+        }
+
+        $binaryInstaller = $this->binaryInstaller;
+        $installPath = $this->getInstallPath($package);
+        return $promise->then(function () use ($binaryInstaller, $installPath, $package, $repo) {
+            $binaryInstaller->installBinaries($package, $installPath);
             if (!$repo->hasPackage($package)) {
                 $repo->addPackage(clone $package);
             }
+        });
     }
 
     /**
@@ -150,12 +159,20 @@ class LibraryInstaller implements InstallerInterface, BinaryPresenceInterface
         $this->initializeVendorDir();
 
         $this->binaryInstaller->removeBinaries($initial);
-        $this->updateCode($initial, $target);
-        $this->binaryInstaller->installBinaries($target, $this->getInstallPath($target));
+        $promise = $this->updateCode($initial, $target);
+        if (!$promise instanceof PromiseInterface) {
+            $promise = \React\Promise\resolve();
+        }
+
+        $binaryInstaller = $this->binaryInstaller;
+        $installPath = $this->getInstallPath($target);
+        return $promise->then(function () use ($binaryInstaller, $installPath, $target, $initial, $repo) {
+            $binaryInstaller->installBinaries($target, $installPath);
             $repo->removePackage($initial);
             if (!$repo->hasPackage($target)) {
                 $repo->addPackage(clone $target);
             }
+        });
     }
 
     /**
@@ -167,17 +184,25 @@ class LibraryInstaller implements InstallerInterface, BinaryPresenceInterface
             throw new \InvalidArgumentException('Package is not installed: '.$package);
         }
 
-        $this->removeCode($package);
-        $this->binaryInstaller->removeBinaries($package);
+        $promise = $this->removeCode($package);
+        if (!$promise instanceof PromiseInterface) {
+            $promise = \React\Promise\resolve();
+        }
+
+        $binaryInstaller = $this->binaryInstaller;
+        $downloadPath = $this->getPackageBasePath($package);
+        $filesystem = $this->filesystem;
+        return $promise->then(function () use ($binaryInstaller, $filesystem, $downloadPath, $package, $repo) {
+            $binaryInstaller->removeBinaries($package);
             $repo->removePackage($package);
 
-        $downloadPath = $this->getPackageBasePath($package);
             if (strpos($package->getName(), '/')) {
                 $packageVendorDir = dirname($downloadPath);
-            if (is_dir($packageVendorDir) && $this->filesystem->isDirEmpty($packageVendorDir)) {
+                if (is_dir($packageVendorDir) && $filesystem->isDirEmpty($packageVendorDir)) {
                     Silencer::call('rmdir', $packageVendorDir);
                 }
             }
+        });
     }
 
     /**
@@ -227,7 +252,7 @@ class LibraryInstaller implements InstallerInterface, BinaryPresenceInterface
     protected function installCode(PackageInterface $package)
     {
         $downloadPath = $this->getInstallPath($package);
-        $this->downloadManager->install($package, $downloadPath);
+        return $this->downloadManager->install($package, $downloadPath);
     }
 
     protected function updateCode(PackageInterface $initial, PackageInterface $target)
@@ -240,21 +265,31 @@ class LibraryInstaller implements InstallerInterface, BinaryPresenceInterface
             if (substr($initialDownloadPath, 0, strlen($targetDownloadPath)) === $targetDownloadPath
                 || substr($targetDownloadPath, 0, strlen($initialDownloadPath)) === $initialDownloadPath
             ) {
-                $this->removeCode($initial);
-                $this->installCode($target);
+                $promise = $this->removeCode($initial);
+                if (!$promise instanceof PromiseInterface) {
+                    $promise = \React\Promise\resolve();
+                }
 
-                return;
+                $self = $this;
+                return $promise->then(function () use ($self, $target) {
+                    $reflMethod = new \ReflectionMethod($self, 'installCode');
+                    $reflMethod->setAccessible(true);
+
+                    // equivalent of $this->installCode($target) with php 5.3 support
+                    // TODO remove this once 5.3 support is dropped
+                    return $reflMethod->invoke($self, $target);
+                });
             }
 
             $this->filesystem->rename($initialDownloadPath, $targetDownloadPath);
         }
-        $this->downloadManager->update($initial, $target, $targetDownloadPath);
+        return $this->downloadManager->update($initial, $target, $targetDownloadPath);
     }
 
     protected function removeCode(PackageInterface $package)
     {
         $downloadPath = $this->getPackageBasePath($package);
-        $this->downloadManager->remove($package, $downloadPath);
+        return $this->downloadManager->remove($package, $downloadPath);
     }
 
     protected function initializeVendorDir()

src/Composer/Installer/MetapackageInstaller.php

@@ -16,6 +16,9 @@ use Composer\Repository\InstalledRepositoryInterface;
 use Composer\Package\PackageInterface;
 use Composer\Package\Version\VersionParser;
 use Composer\IO\IOInterface;
+use Composer\DependencyResolver\Operation\UpdateOperation;
+use Composer\DependencyResolver\Operation\InstallOperation;
+use Composer\DependencyResolver\Operation\UninstallOperation;
 
 /**
  * Metapackage installation manager.
@@ -76,7 +79,7 @@ class MetapackageInstaller implements InstallerInterface
      */
     public function install(InstalledRepositoryInterface $repo, PackageInterface $package)
     {
-        $this->io->writeError("  - Installing <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>)");
+        $this->io->writeError("  - " . InstallOperation::format($package));
 
         $repo->addPackage(clone $package);
     }
@@ -90,11 +93,7 @@ class MetapackageInstaller implements InstallerInterface
             throw new \InvalidArgumentException('Package is not installed: '.$initial);
         }
 
-        $name = $target->getName();
-        $from = $initial->getFullPrettyVersion();
-        $to = $target->getFullPrettyVersion();
-        $actionName = VersionParser::isUpgrade($initial->getVersion(), $target->getVersion()) ? 'Upgrading' : 'Downgrading';
-        $this->io->writeError("  - " . $actionName . " <info>" . $name . "</info> (<comment>" . $from . "</comment> => <comment>" . $to . "</comment>)");
+        $this->io->writeError("  - " . UpdateOperation::format($initial, $target));
 
         $repo->removePackage($initial);
         $repo->addPackage(clone $target);
@@ -109,7 +108,7 @@ class MetapackageInstaller implements InstallerInterface
             throw new \InvalidArgumentException('Package is not installed: '.$package);
         }
 
-        $this->io->writeError("  - Removing <info>" . $package->getName() . "</info> (<comment>" . $package->getFullPrettyVersion() . "</comment>)");
+        $this->io->writeError("  - " . UninstallOperation::format($package));
 
         $repo->removePackage($package);
     }

src/Composer/Installer/PluginInstaller.php

@@ -16,6 +16,8 @@ use Composer\Composer;
 use Composer\IO\IOInterface;
 use Composer\Repository\InstalledRepositoryInterface;
 use Composer\Package\PackageInterface;
+use Composer\Util\Filesystem;
+use React\Promise\PromiseInterface;
 
 /**
  * Installer for plugin packages
@@ -33,9 +35,9 @@ class PluginInstaller extends LibraryInstaller
      * @param IOInterface $io
      * @param Composer    $composer
      */
-    public function __construct(IOInterface $io, Composer $composer)
+    public function __construct(IOInterface $io, Composer $composer, Filesystem $fs = null, BinaryInstaller $binaryInstaller = null)
     {
-        parent::__construct($io, $composer, 'composer-plugin');
+        parent::__construct($io, $composer, 'composer-plugin', $fs, $binaryInstaller);
         $this->installationManager = $composer->getInstallationManager();
     }
 
@@ -65,15 +67,20 @@ class PluginInstaller extends LibraryInstaller
      */
     public function install(InstalledRepositoryInterface $repo, PackageInterface $package)
     {
-        parent::install($repo, $package);
-        try {
-            $this->composer->getPluginManager()->registerPackage($package, true);
-        } catch (\Exception $e) {
-            // Rollback installation
-            $this->io->writeError('Plugin initialization failed ('.$e->getMessage().'), uninstalling plugin');
-            parent::uninstall($repo, $package);
-            throw $e;
+        $promise = parent::install($repo, $package);
+        if (!$promise instanceof PromiseInterface) {
+            $promise = \React\Promise\resolve();
         }
+
+        $pluginManager = $this->composer->getPluginManager();
+        $self = $this;
+        return $promise->then(function () use ($self, $pluginManager, $package, $repo) {
+            try {
+                $pluginManager->registerPackage($package, true);
+            } catch (\Exception $e) {
+                $self->rollbackInstall($e, $repo, $package);
+            }
+        });
     }
 
     /**
@@ -81,22 +88,38 @@ class PluginInstaller extends LibraryInstaller
      */
     public function update(InstalledRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target)
     {
-        parent::update($repo, $initial, $target);
-
-        try {
-            $this->composer->getPluginManager()->deactivatePackage($initial, true);
-            $this->composer->getPluginManager()->registerPackage($target, true);
-        } catch (\Exception $e) {
-            // Rollback installation
-            $this->io->writeError('Plugin initialization failed, uninstalling plugin');
-            parent::uninstall($repo, $target);
-            throw $e;
+        $promise = parent::update($repo, $initial, $target);
+        if (!$promise instanceof PromiseInterface) {
+            $promise = \React\Promise\resolve();
         }
+
+        $pluginManager = $this->composer->getPluginManager();
+        $self = $this;
+        return $promise->then(function () use ($self, $pluginManager, $initial, $target, $repo) {
+            try {
+                $pluginManager->deactivatePackage($initial, true);
+                $pluginManager->registerPackage($target, true);
+            } catch (\Exception $e) {
+                $self->rollbackInstall($e, $repo, $target);
+            }
+        });
     }
 
     public function uninstall(InstalledRepositoryInterface $repo, PackageInterface $package)
     {
         $this->composer->getPluginManager()->uninstallPackage($package, true);
+
+        return parent::uninstall($repo, $package);
+    }
+
+    /**
+     * TODO v3 should make this private once we can drop PHP 5.3 support
+     * @private
+     */
+    public function rollbackInstall(\Exception $e, InstalledRepositoryInterface $repo, PackageInterface $package)
+    {
+        $this->io->writeError('Plugin initialization failed ('.$e->getMessage().'), uninstalling plugin');
         parent::uninstall($repo, $package);
+        throw $e;
     }
 }

src/Composer/Installer/ProjectInstaller.php

@@ -29,11 +29,11 @@ class ProjectInstaller implements InstallerInterface
     private $downloadManager;
     private $filesystem;
 
-    public function __construct($installPath, DownloadManager $dm)
+    public function __construct($installPath, DownloadManager $dm, Filesystem $fs)
     {
         $this->installPath = rtrim(strtr($installPath, '\\', '/'), '/').'/';
         $this->downloadManager = $dm;
-        $this->filesystem = new Filesystem;
+        $this->filesystem = $fs;
     }
 
     /**
@@ -76,7 +76,7 @@ class ProjectInstaller implements InstallerInterface
      */
     public function prepare($type, PackageInterface $package, PackageInterface $prevPackage = null)
     {
-        $this->downloadManager->prepare($type, $package, $this->installPath, $prevPackage);
+        return $this->downloadManager->prepare($type, $package, $this->installPath, $prevPackage);
     }
 
     /**
@@ -84,7 +84,7 @@ class ProjectInstaller implements InstallerInterface
      */
     public function cleanup($type, PackageInterface $package, PackageInterface $prevPackage = null)
     {
-        $this->downloadManager->cleanup($type, $package, $this->installPath, $prevPackage);
+        return $this->downloadManager->cleanup($type, $package, $this->installPath, $prevPackage);
     }
 
     /**
@@ -92,7 +92,7 @@ class ProjectInstaller implements InstallerInterface
      */
     public function install(InstalledRepositoryInterface $repo, PackageInterface $package)
     {
-        $this->downloadManager->install($package, $this->installPath);
+        return $this->downloadManager->install($package, $this->installPath);
     }
 
     /**

src/Composer/Package/Archiver/ArchiveManager.php

@@ -25,7 +25,9 @@ use Composer\Json\JsonFile;
  */
 class ArchiveManager
 {
+    /** @var DownloadManager */
     protected $downloadManager;
+    /** @var Loop */
     protected $loop;
 
     /**

src/Composer/Package/BasePackage.php

@@ -233,7 +233,7 @@ abstract class BasePackage implements PackageInterface
         }
 
         // if source reference is a sha1 hash -- truncate
-        if ($truncate && \strlen($reference) === 40) {
+        if ($truncate && \strlen($reference) === 40 && $this->getSourceType() !== 'svn') {
             return $this->getPrettyVersion() . ' ' . substr($reference, 0, 7);
         }
 

src/Composer/Package/Loader/RootPackageLoader.php

@@ -58,7 +58,7 @@ class RootPackageLoader extends ArrayLoader
 
         $this->manager = $manager;
         $this->config = $config;
-        $this->versionGuesser = $versionGuesser ?: new VersionGuesser($config, new ProcessExecutor(), $this->versionParser);
+        $this->versionGuesser = $versionGuesser ?: new VersionGuesser($config, new ProcessExecutor($io), $this->versionParser);
         $this->io = $io;
     }
 

src/Composer/Package/Locker.php

@@ -57,7 +57,7 @@ class Locker
      * @param InstallationManager $installationManager  installation manager instance
      * @param string              $composerFileContents The contents of the composer file
      */
-    public function __construct(IOInterface $io, JsonFile $lockFile, InstallationManager $installationManager, $composerFileContents)
+    public function __construct(IOInterface $io, JsonFile $lockFile, InstallationManager $installationManager, $composerFileContents, ProcessExecutor $process = null)
     {
         $this->lockFile = $lockFile;
         $this->installationManager = $installationManager;
@@ -65,7 +65,7 @@ class Locker
         $this->contentHash = self::getContentHash($composerFileContents);
         $this->loader = new ArrayLoader(null, true);
         $this->dumper = new ArrayDumper();
-        $this->process = new ProcessExecutor($io);
+        $this->process = $process ?: new ProcessExecutor($io);
     }
 
     /**

src/Composer/Plugin/PluginManager.php

@@ -34,15 +34,23 @@ use Composer\Util\PackageSorter;
  */
 class PluginManager
 {
+    /** @var Composer */
     protected $composer;
+    /** @var IOInterface */
     protected $io;
+    /** @var Composer */
     protected $globalComposer;
+    /** @var VersionParser */
     protected $versionParser;
+    /** @var bool */
     protected $disablePlugins = false;
 
+    /** @var array<PluginInterface> */
     protected $plugins = array();
+    /** @var array<string, PluginInterface> */
     protected $registeredPlugins = array();
 
+    /** @var int */
     private static $classCounter = 0;
 
     /**

src/Composer/Plugin/PreFileDownloadEvent.php

@@ -32,18 +32,32 @@ class PreFileDownloadEvent extends Event
      */
     private $processedUrl;
 
+    /**
+     * @var string
+     */
+    private $type;
+
+    /**
+     * @var mixed
+     */
+    private $context;
+
     /**
      * Constructor.
      *
      * @param string          $name            The event name
      * @param HttpDownloader  $httpDownloader
      * @param string          $processedUrl
+     * @param string          $type
+     * @param mixed           $context
      */
-    public function __construct($name, HttpDownloader $httpDownloader, $processedUrl)
+    public function __construct($name, HttpDownloader $httpDownloader, $processedUrl, $type, $context = null)
     {
         parent::__construct($name);
         $this->httpDownloader = $httpDownloader;
         $this->processedUrl = $processedUrl;
+        $this->type = $type;
+        $this->context = $context;
     }
 
     /**
@@ -55,7 +69,7 @@ class PreFileDownloadEvent extends Event
     }
 
     /**
-     * Retrieves the processed URL this remote filesystem will be used for
+     * Retrieves the processed URL that will be downloaded.
      *
      * @return string
      */
@@ -63,4 +77,36 @@ class PreFileDownloadEvent extends Event
     {
         return $this->processedUrl;
     }
+
+    /**
+     * Sets the processed URL that will be downloaded.
+     *
+     * @param string $processedUrl New processed URL
+     */
+    public function setProcessedUrl($processedUrl)
+    {
+        $this->processedUrl = $processedUrl;
+    }
+
+    /**
+     * Returns the type of this download (package, metadata).
+     *
+     * @return string
+     */
+    public function getType()
+    {
+        return $this->type;
+    }
+
+    /**
+     * Returns the context of this download, if any.
+     *
+     * If this download is of type package, the package object is returned.
+     *
+     * @return mixed
+     */
+    public function getContext()
+    {
+        return $this->context;
+    }
 }

src/Composer/Repository/ComposerRepository.php

@@ -23,6 +23,7 @@ use Composer\Config;
 use Composer\Composer;
 use Composer\Factory;
 use Composer\IO\IOInterface;
+use Composer\Semver\CompilingMatcher;
 use Composer\Util\HttpDownloader;
 use Composer\Util\Loop;
 use Composer\Plugin\PluginEvents;
@@ -764,7 +765,7 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
                 continue;
             }
 
-            if ($constraint && !$constraint->matches(new Constraint('==', $version))) {
+            if ($constraint && !CompilingMatcher::match($constraint, Constraint::OP_EQ, $version)) {
                 continue;
             }
 
@@ -1013,8 +1014,9 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         while ($retries--) {
             try {
                 if ($this->eventDispatcher) {
-                    $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename);
+                    $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename, 'metadata');
                     $this->eventDispatcher->dispatch($preFileDownloadEvent->getName(), $preFileDownloadEvent);
+                    $filename = $preFileDownloadEvent->getProcessedUrl();
                 }
 
                 $response = $this->httpDownloader->get($filename, $this->options);
@@ -1099,8 +1101,9 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         while ($retries--) {
             try {
                 if ($this->eventDispatcher) {
-                    $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename);
+                    $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename, 'metadata');
                     $this->eventDispatcher->dispatch($preFileDownloadEvent->getName(), $preFileDownloadEvent);
+                    $filename = $preFileDownloadEvent->getProcessedUrl();
                 }
 
                 $options = $this->options;
@@ -1155,18 +1158,19 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
         $retries = 3;
 
         if (isset($this->packagesNotFoundCache[$filename])) {
-            return new Promise(function ($resolve, $reject) { $resolve(array('packages' => array())); });
+            return \React\Promise\resolve(array('packages' => array()));
         }
 
         if (isset($this->freshMetadataUrls[$filename]) && $lastModifiedTime) {
             // make it look like we got a 304 response
-            return new Promise(function ($resolve, $reject) { $resolve(true); });
+            return \React\Promise\resolve(true);
         }
 
         $httpDownloader = $this->httpDownloader;
         if ($this->eventDispatcher) {
-            $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename);
+            $preFileDownloadEvent = new PreFileDownloadEvent(PluginEvents::PRE_FILE_DOWNLOAD, $this->httpDownloader, $filename, 'metadata');
             $this->eventDispatcher->dispatch($preFileDownloadEvent->getName(), $preFileDownloadEvent);
+            $filename = $preFileDownloadEvent->getProcessedUrl();
         }
 
         $options = $lastModifiedTime ? array('http' => array('header' => array('If-Modified-Since: '.$lastModifiedTime))) : array();

src/Composer/Repository/PlatformRepository.php

@@ -30,6 +30,7 @@ class PlatformRepository extends ArrayRepository
 {
     const PLATFORM_PACKAGE_REGEX = '{^(?:php(?:-64bit|-ipv6|-zts|-debug)?|hhvm|(?:ext|lib)-[a-z0-9](?:[_.-]?[a-z0-9]+)*|composer-(?:plugin|runtime)-api)$}iD';
 
+    private static $hhvmVersion;
     private $versionParser;
 
     /**
@@ -45,7 +46,7 @@ class PlatformRepository extends ArrayRepository
 
     public function __construct(array $packages = array(), array $overrides = array(), ProcessExecutor $process = null)
     {
-        $this->process = $process === null ? (new ProcessExecutor()) : $process;
+        $this->process = $process;
         foreach ($overrides as $name => $version) {
             $this->overrides[strtolower($name)] = array('name' => $name, 'version' => $version);
         }
@@ -251,22 +252,7 @@ class PlatformRepository extends ArrayRepository
             $this->addPackage($lib);
         }
 
-        $hhvmVersion = defined('HHVM_VERSION') ? HHVM_VERSION : null;
-        if ($hhvmVersion === null && !Platform::isWindows()) {
-            $finder = new ExecutableFinder();
-            $hhvm = $finder->find('hhvm');
-            if ($hhvm !== null) {
-                $exitCode = $this->process->execute(
-                    ProcessExecutor::escape($hhvm).
-                    ' --php -d hhvm.jit=0 -r "echo HHVM_VERSION;" 2>/dev/null',
-                    $hhvmVersion
-                );
-                if ($exitCode !== 0) {
-                    $hhvmVersion = null;
-                }
-            }
-        }
-        if ($hhvmVersion) {
+        if ($hhvmVersion = self::getHHVMVersion($this->process)) {
             try {
                 $prettyVersion = $hhvmVersion;
                 $version = $this->versionParser->normalize($prettyVersion);
@@ -362,4 +348,29 @@ class PlatformRepository extends ArrayRepository
     {
         return 'ext-' . str_replace(' ', '-', $name);
     }
+
+    private static function getHHVMVersion(ProcessExecutor $process = null)
+    {
+        if (null !== self::$hhvmVersion) {
+            return self::$hhvmVersion ?: null;
+        }
+
+        self::$hhvmVersion = defined('HHVM_VERSION') ? HHVM_VERSION : null;
+        if (self::$hhvmVersion === null && !Platform::isWindows()) {
+            self::$hhvmVersion = false;
+            $finder = new ExecutableFinder();
+            $hhvmPath = $finder->find('hhvm');
+            if ($hhvmPath !== null) {
+                $process = $process ?: new ProcessExecutor();
+                $exitCode = $process->execute(
+                    ProcessExecutor::escape($hhvmPath).
+                    ' --php -d hhvm.jit=0 -r "echo HHVM_VERSION;" 2>/dev/null',
+                    self::$hhvmVersion
+                );
+                if ($exitCode !== 0) {
+                    self::$hhvmVersion = false;
+                }
+            }
+        }
+    }
 }

src/Composer/Repository/RepositoryFactory.php

@@ -17,6 +17,7 @@ use Composer\IO\IOInterface;
 use Composer\Config;
 use Composer\EventDispatcher\EventDispatcher;
 use Composer\Util\HttpDownloader;
+use Composer\Util\ProcessExecutor;
 use Composer\Json\JsonFile;
 
 /**
@@ -114,9 +115,9 @@ class RepositoryFactory
      * @param  HttpDownloader    $httpDownloader
      * @return RepositoryManager
      */
-    public static function manager(IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $eventDispatcher = null)
+    public static function manager(IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $eventDispatcher = null, ProcessExecutor $process = null)
     {
-        $rm = new RepositoryManager($io, $config, $httpDownloader, $eventDispatcher);
+        $rm = new RepositoryManager($io, $config, $httpDownloader, $eventDispatcher, $process);
         $rm->setRepositoryClass('composer', 'Composer\Repository\ComposerRepository');
         $rm->setRepositoryClass('vcs', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('package', 'Composer\Repository\PackageRepository');

src/Composer/Repository/RepositoryManager.php

@@ -17,6 +17,7 @@ use Composer\Config;
 use Composer\EventDispatcher\EventDispatcher;
 use Composer\Package\PackageInterface;
 use Composer\Util\HttpDownloader;
+use Composer\Util\ProcessExecutor;
 
 /**
  * Repositories manager.
@@ -27,20 +28,30 @@ use Composer\Util\HttpDownloader;
  */
 class RepositoryManager
 {
+    /** @var InstalledRepositoryInterface */
     private $localRepository;
+    /** @var list<RepositoryInterface> */
     private $repositories = array();
+    /** @var array<string, string> */
     private $repositoryClasses = array();
+    /** @var IOInterface */
     private $io;
+    /** @var Config */
     private $config;
-    private $eventDispatcher;
+    /** @var HttpDownloader */
     private $httpDownloader;
+    /** @var ?EventDispatcher */
+    private $eventDispatcher;
+    /** @var ProcessExecutor */
+    private $process;
 
-    public function __construct(IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $eventDispatcher = null)
+    public function __construct(IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $eventDispatcher = null, ProcessExecutor $process = null)
     {
         $this->io = $io;
         $this->config = $config;
         $this->httpDownloader = $httpDownloader;
         $this->eventDispatcher = $eventDispatcher;
+        $this->process = $process ?: new ProcessExecutor($io);
     }
 
     /**
@@ -130,7 +141,7 @@ class RepositoryManager
             unset($config['only'], $config['exclude'], $config['canonical']);
         }
 
-        $repository = new $class($config, $this->io, $this->config, $this->httpDownloader, $this->eventDispatcher);
+        $repository = new $class($config, $this->io, $this->config, $this->httpDownloader, $this->eventDispatcher, $this->process);
 
         if (isset($filterConfig)) {
             $repository = new FilterRepository($repository, $filterConfig);

src/Composer/Repository/RepositorySet.php

@@ -19,6 +19,7 @@ use Composer\EventDispatcher\EventDispatcher;
 use Composer\IO\IOInterface;
 use Composer\IO\NullIO;
 use Composer\Package\BasePackage;
+use Composer\Package\AliasPackage;
 use Composer\Package\Version\VersionParser;
 use Composer\Repository\CompositeRepository;
 use Composer\Repository\PlatformRepository;
@@ -44,7 +45,7 @@ class RepositorySet
 
     /**
      * @var array[]
-     * @psalm-var list<array{package: string, version: string, alias: string, alias_normalized: string}>
+     * @psalm-var array<string, array<string, array{alias: string, alias_normalized: string}>>
      */
     private $rootAliases;
 
@@ -91,7 +92,7 @@ class RepositorySet
      */
     public function __construct($minimumStability = 'stable', array $stabilityFlags = array(), array $rootAliases = array(), array $rootReferences = array(), array $rootRequires = array())
     {
-        $this->rootAliases = $rootAliases;
+        $this->rootAliases = self::getRootAliasesPerPackage($rootAliases);
         $this->rootReferences = $rootReferences;
 
         $this->acceptableStabilities = array();
@@ -249,8 +250,22 @@ class RepositorySet
 
         $packages = array();
         foreach ($this->repositories as $repository) {
-            $packages = array_merge($packages, $repository->getPackages());
+            foreach ($repository->getPackages() as $package) {
+                $packages[] = $package;
+
+                if (isset($this->rootAliases[$package->getName()][$package->getVersion()])) {
+                    $alias = $this->rootAliases[$package->getName()][$package->getVersion()];
+                    while ($package instanceof AliasPackage) {
+                        $package = $package->getAliasOf();
                     }
+                    $aliasPackage = new AliasPackage($package, $alias['alias_normalized'], $alias['alias']);
+                    $aliasPackage->setRootPackageAlias(true);
+                    $packages[] = $aliasPackage;
+                }
+
+            }
+        }
+
         return new Pool($packages);
     }
 
@@ -270,4 +285,18 @@ class RepositorySet
 
         return $this->createPool($request, new NullIO());
     }
+
+    private static function getRootAliasesPerPackage(array $aliases)
+    {
+        $normalizedAliases = array();
+
+        foreach ($aliases as $alias) {
+            $normalizedAliases[$alias['package']][$alias['version']] = array(
+                'alias' => $alias['alias'],
+                'alias_normalized' => $alias['alias_normalized'],
+            );
+        }
+
+        return $normalizedAliases;
+    }
 }

src/Composer/Repository/Vcs/GitDriver.php

@@ -223,7 +223,6 @@ class GitDriver extends VcsDriver
         }
 
         $process = new ProcessExecutor($io);
-
         return $process->execute('git ls-remote --heads ' . ProcessExecutor::escape($url), $output) === 0;
     }
 }

src/Composer/Repository/Vcs/GitHubDriver.php

@@ -338,14 +338,12 @@ class GitHubDriver extends VcsDriver
             $this->branches = array();
             $resource = $this->getApiUrl() . '/repos/'.$this->owner.'/'.$this->repository.'/git/refs/heads?per_page=100';
 
-            $branchBlacklist = array('gh-pages');
-
             do {
                 $response = $this->getContents($resource);
                 $branchData = $response->decodeJson();
                 foreach ($branchData as $branch) {
                     $name = substr($branch['ref'], 11);
-                    if (!in_array($name, $branchBlacklist)) {
+                    if ($name !== 'gh-pages') {
                         $this->branches[$name] = $branch['object']['sha'];
                     }
                 }

src/Composer/Repository/Vcs/HgDriver.php

@@ -228,8 +228,8 @@ class HgDriver extends VcsDriver
             return false;
         }
 
-        $processExecutor = new ProcessExecutor($io);
-        $exit = $processExecutor->execute(sprintf('hg identify %s', ProcessExecutor::escape($url)), $ignored);
+        $process = new ProcessExecutor($io);
+        $exit = $process->execute(sprintf('hg identify %s', ProcessExecutor::escape($url)), $ignored);
 
         return $exit === 0;
     }

src/Composer/Repository/Vcs/SvnDriver.php

@@ -307,9 +307,8 @@ class SvnDriver extends VcsDriver
             return false;
         }
 
-        $processExecutor = new ProcessExecutor($io);
-
-        $exit = $processExecutor->execute(
+        $process = new ProcessExecutor($io);
+        $exit = $process->execute(
             "svn info --non-interactive ".ProcessExecutor::escape($url),
             $ignoredOutput
         );
@@ -320,14 +319,14 @@ class SvnDriver extends VcsDriver
         }
 
         // Subversion client 1.7 and older
-        if (false !== stripos($processExecutor->getErrorOutput(), 'authorization failed:')) {
+        if (false !== stripos($process->getErrorOutput(), 'authorization failed:')) {
             // This is likely a remote Subversion repository that requires
             // authentication. We will handle actual authentication later.
             return true;
         }
 
         // Subversion client 1.8 and newer
-        if (false !== stripos($processExecutor->getErrorOutput(), 'Authentication failed')) {
+        if (false !== stripos($process->getErrorOutput(), 'Authentication failed')) {
             // This is likely a remote Subversion or newer repository that requires
             // authentication. We will handle actual authentication later.
             return true;

src/Composer/Repository/VcsRepository.php

@@ -53,7 +53,7 @@ class VcsRepository extends ArrayRepository implements ConfigurableRepositoryInt
     private $emptyReferences = array();
     private $versionTransportExceptions = array();
 
-    public function __construct(array $repoConfig, IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $dispatcher = null, array $drivers = null, VersionCacheInterface $versionCache = null)
+    public function __construct(array $repoConfig, IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $dispatcher = null, ProcessExecutor $process = null, array $drivers = null, VersionCacheInterface $versionCache = null)
     {
         parent::__construct();
         $this->drivers = $drivers ?: array(
@@ -78,7 +78,7 @@ class VcsRepository extends ArrayRepository implements ConfigurableRepositoryInt
         $this->repoConfig = $repoConfig;
         $this->versionCache = $versionCache;
         $this->httpDownloader = $httpDownloader;
-        $this->processExecutor = new ProcessExecutor($io);
+        $this->processExecutor = $process ?: new ProcessExecutor($io);
     }
 
     public function getRepoName()

src/Composer/SelfUpdate/Versions.php

@@ -63,7 +63,11 @@ class Versions
 
     public function getLatest($channel = null)
     {
-        $protocol = extension_loaded('openssl') ? 'https' : 'http';
+        if ($this->config->get('disable-tls') === true) {
+            $protocol = 'http';
+        } else {
+            $protocol = 'https';
+        }
         $versions = $this->httpDownloader->get($protocol . '://getcomposer.org/versions')->decodeJson();
 
         foreach ($versions[$channel ?: $this->getChannel()] as $version) {

src/Composer/Util/Filesystem.php

@@ -28,7 +28,7 @@ class Filesystem
 
     public function __construct(ProcessExecutor $executor = null)
     {
-        $this->processExecutor = $executor ?: new ProcessExecutor();
+        $this->processExecutor = $executor;
     }
 
     public function remove($file)
@@ -320,7 +320,7 @@ class Filesystem
         if (Platform::isWindows()) {
             // Try to copy & delete - this is a workaround for random "Access denied" errors.
             $command = sprintf('xcopy %s %s /E /I /Q /Y', ProcessExecutor::escape($source), ProcessExecutor::escape($target));
-            $result = $this->processExecutor->execute($command, $output);
+            $result = $this->getProcess()->execute($command, $output);
 
             // clear stat cache because external processes aren't tracked by the php stat cache
             clearstatcache();
@@ -334,7 +334,7 @@ class Filesystem
             // We do not use PHP's "rename" function here since it does not support
             // the case where $source, and $target are located on different partitions.
             $command = sprintf('mv %s %s', ProcessExecutor::escape($source), ProcessExecutor::escape($target));
-            $result = $this->processExecutor->execute($command, $output);
+            $result = $this->getProcess()->execute($command, $output);
 
             // clear stat cache because external processes aren't tracked by the php stat cache
             clearstatcache();
@@ -546,6 +546,10 @@ class Filesystem
      */
     protected function getProcess()
     {
+        if (!$this->processExecutor) {
+             $this->processExecutor = new ProcessExecutor();
+        }
+
         return $this->processExecutor;
     }
 

src/Composer/Util/Http/CurlDownloader.php

@@ -23,6 +23,7 @@ use Composer\Util\HttpDownloader;
 use React\Promise\Promise;
 
 /**
+ * @internal
  * @author Jordi Boggiano <j.boggiano@seld.be>
  * @author Nicolas Grekas <p@tchwork.com>
  */
@@ -90,6 +91,9 @@ class CurlDownloader
         $this->authHelper = new AuthHelper($io, $config);
     }
 
+    /**
+     * @return int internal job id
+     */
     public function download($resolve, $reject, $origin, $url, $options, $copyTo = null)
     {
         $attributes = array();
@@ -101,6 +105,9 @@ class CurlDownloader
         return $this->initDownload($resolve, $reject, $origin, $url, $options, $copyTo, $attributes);
     }
 
+    /**
+     * @return int internal job id
+     */
     private function initDownload($resolve, $reject, $origin, $url, $options, $copyTo = null, array $attributes = array())
     {
         $attributes = array_merge(array(
@@ -199,8 +206,29 @@ class CurlDownloader
         }
 
         $this->checkCurlResult(curl_multi_add_handle($this->multiHandle, $curlHandle));
-// TODO progress
+        // TODO progress
         //$params['notification'](STREAM_NOTIFY_RESOLVE, STREAM_NOTIFY_SEVERITY_INFO, '', 0, 0, 0, false);
+
+        return (int) $curlHandle;
+    }
+
+    public function abortRequest($id)
+    {
+        if (isset($this->jobs[$id]) && isset($this->jobs[$id]['handle'])) {
+            $job = $this->jobs[$id];
+            curl_multi_remove_handle($this->multiHandle, $job['handle']);
+            curl_close($job['handle']);
+            if (is_resource($job['headerHandle'])) {
+                fclose($job['headerHandle']);
+            }
+            if (is_resource($job['bodyHandle'])) {
+                fclose($job['bodyHandle']);
+            }
+            if ($job['filename']) {
+                @unlink($job['filename'].'~');
+            }
+            unset($this->jobs[$id]);
+        }
     }
 
     public function tick()
@@ -235,7 +263,7 @@ class CurlDownloader
             $statusCode = null;
             $response = null;
             try {
-// TODO progress
+                // TODO progress
                 //$this->onProgress($curlHandle, $job['callback'], $progress, $job['progress']);
                 if (CURLE_OK !== $errno || $error) {
                     throw new TransportException($error);
@@ -285,8 +313,6 @@ class CurlDownloader
                 // fail 4xx and 5xx responses and capture the response
                 if ($statusCode >= 400 && $statusCode <= 599) {
                     throw $this->failResponse($job, $response, $response->getStatusMessage());
-// TODO progress
-//                        $this->io->overwriteError("Downloading (<error>failed</error>)", false);
                 }
 
                 if ($job['attributes']['storeAuth']) {

src/Composer/Util/HttpDownloader.php

@@ -31,6 +31,7 @@ class HttpDownloader
     const STATUS_STARTED = 2;
     const STATUS_COMPLETED = 3;
     const STATUS_FAILED = 4;
+    const STATUS_ABORTED = 5;
 
     private $io;
     private $config;
@@ -44,6 +45,7 @@ class HttpDownloader
     private $rfs;
     private $idGen = 0;
     private $disabled;
+    private $allowAsync = false;
 
     /**
      * @param IOInterface $io         The IO instance
@@ -139,6 +141,10 @@ class HttpDownloader
             'origin' => Url::getOrigin($this->config, $request['url']),
         );
 
+        if (!$sync && !$this->allowAsync) {
+            throw new \LogicException('You must use the HttpDownloader instance which is part of a Composer\Loop instance to be able to run async http requests');
+        }
+
         // capture username/password from URL if there is one
         if (preg_match('{^https?://([^:/]+):([^@/]+)@([^/]+)}i', $request['url'], $match)) {
             $this->io->setAuthentication($job['origin'], rawurldecode($match[1]), rawurldecode($match[2]));
@@ -179,8 +185,20 @@ class HttpDownloader
 
         $downloader = $this;
         $io = $this->io;
+        $curl = $this->curl;
 
-        $canceler = function () {};
+        $canceler = function () use (&$job, $curl) {
+            if ($job['status'] === self::STATUS_QUEUED) {
+                $job['status'] = self::STATUS_ABORTED;
+            }
+            if ($job['status'] !== self::STATUS_STARTED) {
+                return;
+            }
+            $job['status'] = self::STATUS_ABORTED;
+            if (isset($job['curl_id'])) {
+                $curl->abortRequest($job['curl_id']);
+            }
+        };
 
         $promise = new Promise($resolver, $canceler);
         $promise->then(function ($response) use (&$job, $downloader) {
@@ -189,7 +207,6 @@ class HttpDownloader
 
             // TODO 3.0 this should be done directly on $this when PHP 5.3 is dropped
             $downloader->markJobDone();
-            $downloader->scheduleNextJob();
 
             return $response;
         }, function ($e) use (&$job, $downloader) {
@@ -197,7 +214,6 @@ class HttpDownloader
             $job['exception'] = $e;
 
             $downloader->markJobDone();
-            $downloader->scheduleNextJob();
 
             throw $e;
         });
@@ -239,9 +255,9 @@ class HttpDownloader
         }
 
         if ($job['request']['copyTo']) {
-            $this->curl->download($resolve, $reject, $origin, $url, $options, $job['request']['copyTo']);
+            $job['curl_id'] = $this->curl->download($resolve, $reject, $origin, $url, $options, $job['request']['copyTo']);
         } else {
-            $this->curl->download($resolve, $reject, $origin, $url, $options);
+            $job['curl_id'] = $this->curl->download($resolve, $reject, $origin, $url, $options);
         }
     }
 
@@ -253,49 +269,58 @@ class HttpDownloader
         $this->runningJobs--;
     }
 
-    /**
-     * @private
-     */
-    public function scheduleNextJob()
+    public function wait($index = null)
     {
-        foreach ($this->jobs as $job) {
-            if ($job['status'] === self::STATUS_QUEUED) {
-                $this->startJob($job['id']);
-                if ($this->runningJobs >= $this->maxJobs) {
+        while (true) {
+            if (!$this->countActiveJobs($index)) {
                 return;
             }
+
+            usleep(1000);
+        }
+    }
+
+    /**
+     * @internal
+     */
+    public function enableAsync()
+    {
+        $this->allowAsync = true;
+    }
+
+    /**
+     * @internal
+     *
+     * @return int number of active (queued or started) jobs
+     */
+    public function countActiveJobs($index = null)
+    {
+        if ($this->runningJobs < $this->maxJobs) {
+            foreach ($this->jobs as $job) {
+                if ($job['status'] === self::STATUS_QUEUED && $this->runningJobs < $this->maxJobs) {
+                    $this->startJob($job['id']);
                 }
             }
         }
 
-    public function wait($index = null, $progress = false)
-    {
-        while (true) {
         if ($this->curl) {
             $this->curl->tick();
         }
 
         if (null !== $index) {
-                if ($this->jobs[$index]['status'] === self::STATUS_COMPLETED || $this->jobs[$index]['status'] === self::STATUS_FAILED) {
-                    return;
+            return $this->jobs[$index]['status'] < self::STATUS_COMPLETED ? 1 : 0;
         }
-            } else {
-                $done = true;
+
+        $active = 0;
         foreach ($this->jobs as $job) {
-                    if (!in_array($job['status'], array(self::STATUS_COMPLETED, self::STATUS_FAILED), true)) {
-                        $done = false;
-                        break;
+            if ($job['status'] < self::STATUS_COMPLETED) {
+                $active++;
             } elseif (!$job['sync']) {
                 unset($this->jobs[$job['id']]);
             }
         }
-                if ($done) {
-                    return;
-                }
-            }
 
-            usleep(1000);
-        }
+        return $active;
     }
 
     private function getResponse($index)

src/Composer/Util/Loop.php

@@ -14,6 +14,7 @@ namespace Composer\Util;
 
 use Composer\Util\HttpDownloader;
 use React\Promise\Promise;
+use Symfony\Component\Console\Helper\ProgressBar;
 
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
@@ -21,13 +22,22 @@ use React\Promise\Promise;
 class Loop
 {
     private $httpDownloader;
+    private $processExecutor;
+    private $currentPromises;
 
-    public function __construct(HttpDownloader $httpDownloader)
+    public function __construct(HttpDownloader $httpDownloader = null, ProcessExecutor $processExecutor = null)
     {
         $this->httpDownloader = $httpDownloader;
+        if ($this->httpDownloader) {
+            $this->httpDownloader->enableAsync();
+        }
+        $this->processExecutor = $processExecutor;
+        if ($this->processExecutor) {
+            $this->processExecutor->enableAsync();
+        }
     }
 
-    public function wait(array $promises)
+    public function wait(array $promises, ProgressBar $progress = null)
     {
         /** @var \Exception|null */
         $uncaught = null;
@@ -39,10 +49,52 @@ class Loop
             }
         );
 
-        $this->httpDownloader->wait();
+        $this->currentPromises = $promises;
 
+        if ($progress) {
+            $totalJobs = 0;
+            if ($this->httpDownloader) {
+                $totalJobs += $this->httpDownloader->countActiveJobs();
+            }
+            if ($this->processExecutor) {
+                $totalJobs += $this->processExecutor->countActiveJobs();
+            }
+            $progress->start($totalJobs);
+        }
+
+        while (true) {
+            $activeJobs = 0;
+
+            if ($this->httpDownloader) {
+                $activeJobs += $this->httpDownloader->countActiveJobs();
+            }
+            if ($this->processExecutor) {
+                $activeJobs += $this->processExecutor->countActiveJobs();
+            }
+
+            if ($progress) {
+                $progress->setProgress($progress->getMaxSteps() - $activeJobs);
+            }
+
+            if (!$activeJobs) {
+                break;
+            }
+
+            usleep(5000);
+        }
+
+        $this->currentPromises = null;
         if ($uncaught) {
             throw $uncaught;
         }
     }
+
+    public function abortJobs()
+    {
+        if ($this->currentPromises) {
+            foreach ($this->currentPromises as $promise) {
+                $promise->cancel();
+            }
+        }
+    }
 }

src/Composer/Util/ProcessExecutor.php

@@ -16,18 +16,32 @@ use Composer\IO\IOInterface;
 use Symfony\Component\Process\Process;
 use Symfony\Component\Process\ProcessUtils;
 use Symfony\Component\Process\Exception\RuntimeException;
+use React\Promise\Promise;
 
 /**
  * @author Robert Schönthal <seroscho@googlemail.com>
+ * @author Jordi Boggiano <j.boggiano@seld.be>
  */
 class ProcessExecutor
 {
+    const STATUS_QUEUED = 1;
+    const STATUS_STARTED = 2;
+    const STATUS_COMPLETED = 3;
+    const STATUS_FAILED = 4;
+    const STATUS_ABORTED = 5;
+
     protected static $timeout = 300;
 
     protected $captureOutput;
     protected $errorOutput;
     protected $io;
 
+    private $jobs = array();
+    private $runningJobs = 0;
+    private $maxJobs = 10;
+    private $idGen = 0;
+    private $allowAsync = false;
+
     public function __construct(IOInterface $io = null)
     {
         $this->io = $io;
@@ -112,6 +126,192 @@ class ProcessExecutor
         return $process->getExitCode();
     }
 
+    /**
+     * starts a process on the commandline in async mode
+     *
+     * @param  string $command the command to execute
+     * @param  mixed  $output  the output will be written into this var if passed by ref
+     *                         if a callable is passed it will be used as output handler
+     * @param  string $cwd     the working directory
+     * @return int    statuscode
+     */
+    public function executeAsync($command, $cwd = null)
+    {
+        if (!$this->allowAsync) {
+            throw new \LogicException('You must use the ProcessExecutor instance which is part of a Composer\Loop instance to be able to run async processes');
+        }
+
+        $job = array(
+            'id' => $this->idGen++,
+            'status' => self::STATUS_QUEUED,
+            'command' => $command,
+            'cwd' => $cwd,
+        );
+
+        $resolver = function ($resolve, $reject) use (&$job) {
+            $job['status'] = ProcessExecutor::STATUS_QUEUED;
+            $job['resolve'] = $resolve;
+            $job['reject'] = $reject;
+        };
+
+        $self = $this;
+        $io = $this->io;
+
+        $canceler = function () use (&$job) {
+            if ($job['status'] === self::STATUS_QUEUED) {
+                $job['status'] = self::STATUS_ABORTED;
+            }
+            if ($job['status'] !== self::STATUS_STARTED) {
+                return;
+            }
+            $job['status'] = self::STATUS_ABORTED;
+            try {
+                if (defined('SIGINT')) {
+                    $job['process']->signal(SIGINT);
+                }
+            } catch (\Exception $e) {
+                // signal can throw in various conditions, but we don't care if it fails
+            }
+            $job['process']->stop(1);
+        };
+
+        $promise = new Promise($resolver, $canceler);
+        $promise = $promise->then(function () use (&$job, $self) {
+            if ($job['process']->isSuccessful()) {
+                $job['status'] = ProcessExecutor::STATUS_COMPLETED;
+            } else {
+                $job['status'] = ProcessExecutor::STATUS_FAILED;
+            }
+
+            // TODO 3.0 this should be done directly on $this when PHP 5.3 is dropped
+            $self->markJobDone();
+
+            return $job['process'];
+        }, function ($e) use (&$job, $self) {
+            $job['status'] = ProcessExecutor::STATUS_FAILED;
+
+            $self->markJobDone();
+
+            throw $e;
+        });
+        $this->jobs[$job['id']] =& $job;
+
+        if ($this->runningJobs < $this->maxJobs) {
+            $this->startJob($job['id']);
+        }
+
+        return $promise;
+    }
+
+    private function startJob($id)
+    {
+        $job =& $this->jobs[$id];
+        if ($job['status'] !== self::STATUS_QUEUED) {
+            return;
+        }
+
+        // start job
+        $job['status'] = self::STATUS_STARTED;
+        $this->runningJobs++;
+
+        $command = $job['command'];
+        $cwd = $job['cwd'];
+
+        if ($this->io && $this->io->isDebug()) {
+            $safeCommand = preg_replace_callback('{://(?P<user>[^:/\s]+):(?P<password>[^@\s/]+)@}i', function ($m) {
+                if (preg_match('{^[a-f0-9]{12,}$}', $m['user'])) {
+                    return '://***:***@';
+                }
+
+                return '://'.$m['user'].':***@';
+            }, $command);
+            $safeCommand = preg_replace("{--password (.*[^\\\\]\') }", '--password \'***\' ', $safeCommand);
+            $this->io->writeError('Executing async command ('.($cwd ?: 'CWD').'): '.$safeCommand);
+        }
+
+        // make sure that null translate to the proper directory in case the dir is a symlink
+        // and we call a git command, because msysgit does not handle symlinks properly
+        if (null === $cwd && Platform::isWindows() && false !== strpos($command, 'git') && getcwd()) {
+            $cwd = realpath(getcwd());
+        }
+
+        // TODO in v3, commands should be passed in as arrays of cmd + args
+        if (method_exists('Symfony\Component\Process\Process', 'fromShellCommandline')) {
+            $process = Process::fromShellCommandline($command, $cwd, null, null, static::getTimeout());
+        } else {
+            $process = new Process($command, $cwd, null, null, static::getTimeout());
+        }
+
+        $job['process'] = $process;
+
+        $process->start();
+    }
+
+    public function wait($index = null)
+    {
+        while (true) {
+            if (!$this->countActiveJobs($index)) {
+                return;
+            }
+
+            usleep(1000);
+        }
+    }
+
+    /**
+     * @internal
+     */
+    public function enableAsync()
+    {
+        $this->allowAsync = true;
+    }
+
+    /**
+     * @internal
+     *
+     * @return int number of active (queued or started) jobs
+     */
+    public function countActiveJobs($index = null)
+    {
+        // tick
+        foreach ($this->jobs as $job) {
+            if ($job['status'] === self::STATUS_STARTED) {
+                if (!$job['process']->isRunning()) {
+                    call_user_func($job['resolve'], $job['process']);
+                }
+            }
+
+            if ($this->runningJobs < $this->maxJobs) {
+                if ($job['status'] === self::STATUS_QUEUED) {
+                    $this->startJob($job['id']);
+                }
+            }
+        }
+
+        if (null !== $index) {
+            return $this->jobs[$index]['status'] < self::STATUS_COMPLETED ? 1 : 0;
+        }
+
+        $active = 0;
+        foreach ($this->jobs as $job) {
+            if ($job['status'] < self::STATUS_COMPLETED) {
+                $active++;
+            } else {
+                unset($this->jobs[$job['id']]);
+            }
+        }
+
+        return $active;
+    }
+
+    /**
+     * @private
+     */
+    public function markJobDone()
+    {
+        $this->runningJobs--;
+    }
+
     public function splitLines($output)
     {
         $output = trim($output);

src/Composer/Util/RemoteFilesystem.php

@@ -20,6 +20,7 @@ use Composer\Util\HttpDownloader;
 use Composer\Util\Http\Response;
 
 /**
+ * @internal
  * @author François Pluchino <francois.pluchino@opendisplay.com>
  * @author Jordi Boggiano <j.boggiano@seld.be>
  * @author Nils Adermann <naderman@naderman.de>
@@ -54,8 +55,9 @@ class RemoteFilesystem
      * @param Config      $config     The config
      * @param array       $options    The options
      * @param bool        $disableTls
+     * @param AuthHelper  $authHelper
      */
-    public function __construct(IOInterface $io, Config $config, array $options = array(), $disableTls = false)
+    public function __construct(IOInterface $io, Config $config, array $options = array(), $disableTls = false, AuthHelper $authHelper = null)
     {
         $this->io = $io;
 
@@ -70,7 +72,7 @@ class RemoteFilesystem
         // handle the other externally set options normally.
         $this->options = array_replace_recursive($this->options, $options);
         $this->config = $config;
-        $this->authHelper = new AuthHelper($io, $config);
+        $this->authHelper = isset($authHelper) ? $authHelper : new AuthHelper($io, $config);
     }
 
     /**

tests/Composer/Test/Downloader/FileDownloaderTest.php

@@ -139,8 +139,8 @@ class FileDownloaderTest extends TestCase
             ->will($this->returnValue($path.'/vendor'));
 
         try {
-            $promise = $downloader->download($packageMock, $path);
             $loop = new Loop($this->httpDownloader);
+            $promise = $downloader->download($packageMock, $path);
             $loop->wait(array($promise));
 
             $this->fail('Download was expected to throw');
@@ -225,8 +225,8 @@ class FileDownloaderTest extends TestCase
         touch($dlFile);
 
         try {
-            $promise = $downloader->download($packageMock, $path);
             $loop = new Loop($this->httpDownloader);
+            $promise = $downloader->download($packageMock, $path);
             $loop->wait(array($promise));
 
             $this->fail('Download was expected to throw');
@@ -296,8 +296,8 @@ class FileDownloaderTest extends TestCase
         mkdir(dirname($dlFile), 0777, true);
         touch($dlFile);
 
-        $promise = $downloader->download($newPackage, $path, $oldPackage);
         $loop = new Loop($this->httpDownloader);
+        $promise = $downloader->download($newPackage, $path, $oldPackage);
         $loop->wait(array($promise));
 
         $downloader->update($oldPackage, $newPackage, $path);

tests/Composer/Test/Downloader/XzDownloaderTest.php

@@ -70,8 +70,8 @@ class XzDownloaderTest extends TestCase
         $downloader = new XzDownloader($io, $config, $httpDownloader = new HttpDownloader($io, $this->getMockBuilder('Composer\Config')->getMock()), null, null, null);
 
         try {
-            $promise = $downloader->download($packageMock, $this->testDir.'/install-path');
             $loop = new Loop($httpDownloader);
+            $promise = $downloader->download($packageMock, $this->testDir.'/install-path');
             $loop->wait(array($promise));
             $downloader->install($packageMock, $this->testDir.'/install-path');
 

tests/Composer/Test/Downloader/ZipDownloaderTest.php

@@ -60,9 +60,6 @@ class ZipDownloaderTest extends TestCase
         }
     }
 
-    /**
-     * @group only
-     */
     public function testErrorMessages()
     {
         if (!class_exists('ZipArchive')) {
@@ -92,8 +89,8 @@ class ZipDownloaderTest extends TestCase
         $this->setPrivateProperty('hasSystemUnzip', false);
 
         try {
-            $promise = $downloader->download($this->package, $path = sys_get_temp_dir().'/composer-zip-test');
             $loop = new Loop($this->httpDownloader);
+            $promise = $downloader->download($this->package, $path = sys_get_temp_dir().'/composer-zip-test');
             $loop->wait(array($promise));
             $downloader->install($this->package, $path);
 
@@ -125,7 +122,8 @@ class ZipDownloaderTest extends TestCase
             ->will($this->returnValue(false));
 
         $this->setPrivateProperty('zipArchiveObject', $zipArchive, $downloader);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
     /**
@@ -150,12 +148,10 @@ class ZipDownloaderTest extends TestCase
             ->will($this->throwException(new \ErrorException('Not a directory')));
 
         $this->setPrivateProperty('zipArchiveObject', $zipArchive, $downloader);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
-    /**
-     * @group only
-     */
     public function testZipArchiveOnlyGood()
     {
         if (!class_exists('ZipArchive')) {
@@ -174,45 +170,66 @@ class ZipDownloaderTest extends TestCase
             ->will($this->returnValue(true));
 
         $this->setPrivateProperty('zipArchiveObject', $zipArchive, $downloader);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
     /**
      * @expectedException \Exception
-     * @expectedExceptionMessage Failed to execute (1) unzip
+     * @expectedExceptionMessage Failed to extract : (1) unzip
      */
     public function testSystemUnzipOnlyFailed()
     {
-        if (!class_exists('ZipArchive')) {
-            $this->markTestSkipped('zip extension missing');
-        }
-
+        $this->setPrivateProperty('isWindows', false);
         $this->setPrivateProperty('hasSystemUnzip', true);
         $this->setPrivateProperty('hasZipArchive', false);
+
+        $procMock = $this->getMockBuilder('Symfony\Component\Process\Process')->disableOriginalConstructor()->getMock();
+        $procMock->expects($this->any())
+            ->method('getExitCode')
+            ->will($this->returnValue(1));
+        $procMock->expects($this->any())
+            ->method('isSuccessful')
+            ->will($this->returnValue(false));
+        $procMock->expects($this->any())
+            ->method('getErrorOutput')
+            ->will($this->returnValue('output'));
+
         $processExecutor = $this->getMockBuilder('Composer\Util\ProcessExecutor')->getMock();
         $processExecutor->expects($this->at(0))
-            ->method('execute')
-            ->will($this->returnValue(1));
+            ->method('executeAsync')
+            ->will($this->returnValue(\React\Promise\resolve($procMock)));
 
-        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, $processExecutor);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, null, $processExecutor);
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
     public function testSystemUnzipOnlyGood()
     {
-        if (!class_exists('ZipArchive')) {
-            $this->markTestSkipped('zip extension missing');
-        }
-
+        $this->setPrivateProperty('isWindows', false);
         $this->setPrivateProperty('hasSystemUnzip', true);
         $this->setPrivateProperty('hasZipArchive', false);
+
+        $procMock = $this->getMockBuilder('Symfony\Component\Process\Process')->disableOriginalConstructor()->getMock();
+        $procMock->expects($this->any())
+            ->method('getExitCode')
+            ->will($this->returnValue(0));
+        $procMock->expects($this->any())
+            ->method('isSuccessful')
+            ->will($this->returnValue(true));
+        $procMock->expects($this->any())
+            ->method('getErrorOutput')
+            ->will($this->returnValue('output'));
+
         $processExecutor = $this->getMockBuilder('Composer\Util\ProcessExecutor')->getMock();
         $processExecutor->expects($this->at(0))
-            ->method('execute')
-            ->will($this->returnValue(0));
+            ->method('executeAsync')
+            ->will($this->returnValue(\React\Promise\resolve($procMock)));
 
-        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, $processExecutor);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, null, $processExecutor);
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
     public function testNonWindowsFallbackGood()
@@ -225,10 +242,21 @@ class ZipDownloaderTest extends TestCase
         $this->setPrivateProperty('hasSystemUnzip', true);
         $this->setPrivateProperty('hasZipArchive', true);
 
+        $procMock = $this->getMockBuilder('Symfony\Component\Process\Process')->disableOriginalConstructor()->getMock();
+        $procMock->expects($this->any())
+            ->method('getExitCode')
+            ->will($this->returnValue(1));
+        $procMock->expects($this->any())
+            ->method('isSuccessful')
+            ->will($this->returnValue(false));
+        $procMock->expects($this->any())
+            ->method('getErrorOutput')
+            ->will($this->returnValue('output'));
+
         $processExecutor = $this->getMockBuilder('Composer\Util\ProcessExecutor')->getMock();
         $processExecutor->expects($this->at(0))
-            ->method('execute')
-            ->will($this->returnValue(1));
+            ->method('executeAsync')
+            ->will($this->returnValue(\React\Promise\resolve($procMock)));
 
         $zipArchive = $this->getMockBuilder('ZipArchive')->getMock();
         $zipArchive->expects($this->at(0))
@@ -238,9 +266,10 @@ class ZipDownloaderTest extends TestCase
             ->method('extractTo')
             ->will($this->returnValue(true));
 
-        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, $processExecutor);
+        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, null, $processExecutor);
         $this->setPrivateProperty('zipArchiveObject', $zipArchive, $downloader);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
     /**
@@ -257,10 +286,21 @@ class ZipDownloaderTest extends TestCase
         $this->setPrivateProperty('hasSystemUnzip', true);
         $this->setPrivateProperty('hasZipArchive', true);
 
+        $procMock = $this->getMockBuilder('Symfony\Component\Process\Process')->disableOriginalConstructor()->getMock();
+        $procMock->expects($this->any())
+            ->method('getExitCode')
+            ->will($this->returnValue(1));
+        $procMock->expects($this->any())
+            ->method('isSuccessful')
+            ->will($this->returnValue(false));
+        $procMock->expects($this->any())
+            ->method('getErrorOutput')
+            ->will($this->returnValue('output'));
+
         $processExecutor = $this->getMockBuilder('Composer\Util\ProcessExecutor')->getMock();
         $processExecutor->expects($this->at(0))
-          ->method('execute')
-          ->will($this->returnValue(1));
+          ->method('executeAsync')
+          ->will($this->returnValue(\React\Promise\resolve($procMock)));
 
         $zipArchive = $this->getMockBuilder('ZipArchive')->getMock();
         $zipArchive->expects($this->at(0))
@@ -270,9 +310,10 @@ class ZipDownloaderTest extends TestCase
           ->method('extractTo')
           ->will($this->returnValue(false));
 
-        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, $processExecutor);
+        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, null, $processExecutor);
         $this->setPrivateProperty('zipArchiveObject', $zipArchive, $downloader);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
     public function testWindowsFallbackGood()
@@ -298,9 +339,10 @@ class ZipDownloaderTest extends TestCase
             ->method('extractTo')
             ->will($this->returnValue(false));
 
-        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, $processExecutor);
+        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, null, $processExecutor);
         $this->setPrivateProperty('zipArchiveObject', $zipArchive, $downloader);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
     }
 
     /**
@@ -330,9 +372,28 @@ class ZipDownloaderTest extends TestCase
           ->method('extractTo')
           ->will($this->returnValue(false));
 
-        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, $processExecutor);
+        $downloader = new MockedZipDownloader($this->io, $this->config, $this->httpDownloader, null, null, null, $processExecutor);
         $this->setPrivateProperty('zipArchiveObject', $zipArchive, $downloader);
-        $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $promise = $downloader->extract($this->package, 'testfile.zip', 'vendor/dir');
+        $this->wait($promise);
+    }
+
+    private function wait($promise)
+    {
+        if (null === $promise) {
+            return;
+        }
+
+        $e = null;
+        $promise->then(function () {
+            // noop
+        }, function ($ex) use (&$e) {
+            $e = $ex;
+        });
+
+        if ($e) {
+            throw $e;
+        }
     }
 }
 
@@ -350,6 +411,6 @@ class MockedZipDownloader extends ZipDownloader
 
     public function extract(PackageInterface $package, $file, $path)
     {
-        parent::extract($package, $file, $path);
+        return parent::extract($package, $file, $path);
     }
 }

tests/Composer/Test/Fixtures/installer/aliases-with-require-dev.test

@@ -0,0 +1,90 @@
+--TEST--
+Aliases are loaded when splitting require-dev from require (https://github.com/composer/composer/issues/8954)
+--COMPOSER--
+{
+    "repositories": [
+        {
+            "type": "package",
+            "package": [
+                {
+                    "name": "a/aliased", "version": "dev-next", "replace": { "a/aliased-replaced": "self.version" }
+                },
+                {
+                    "name": "b/requirer", "version": "2.3.0",
+                    "require": { "a/aliased-replaced": "^4.0" }
+                },
+                {
+                    "name": "a/aliased2", "version": "dev-next", "replace": { "a/aliased-replaced2": "self.version" }
+                },
+                {
+                    "name": "b/requirer2", "version": "2.3.0",
+                    "require": { "a/aliased-replaced": "^4.0", "a/aliased-replaced2": "^4.0" }
+                }
+            ]
+        }
+    ],
+    "require": {
+        "a/aliased": "dev-next as 4.1.0-RC2",
+        "b/requirer": "2.3.0"
+    },
+    "require-dev": {
+        "a/aliased2": "dev-next as 4.1.0-RC2",
+        "b/requirer2": "2.3.0"
+    }
+}
+--RUN--
+update
+--EXPECT-LOCK--
+{
+    "packages": [
+        {
+            "name": "a/aliased", "version": "dev-next",
+            "type": "library",
+            "replace": { "a/aliased-replaced": "self.version" }
+        },
+        {
+            "name": "b/requirer", "version": "2.3.0",
+            "require": { "a/aliased-replaced": "^4.0" },
+            "type": "library"
+        }
+    ],
+    "packages-dev": [
+        {
+            "name": "a/aliased2", "version": "dev-next",
+            "type": "library",
+            "replace": { "a/aliased-replaced2": "self.version" }
+        },
+        {
+            "name": "b/requirer2", "version": "2.3.0",
+            "require": { "a/aliased-replaced": "^4.0", "a/aliased-replaced2": "^4.0" },
+            "type": "library"
+        }
+    ],
+    "aliases": [{
+        "package": "a/aliased2",
+        "version": "dev-next",
+        "alias": "4.1.0-RC2",
+        "alias_normalized": "4.1.0.0-RC2"
+    }, {
+        "package": "a/aliased",
+        "version": "dev-next",
+        "alias": "4.1.0-RC2",
+        "alias_normalized": "4.1.0.0-RC2"
+    }],
+    "minimum-stability": "stable",
+    "stability-flags": {
+        "a/aliased": 20,
+        "a/aliased2": 20
+    },
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
+--EXPECT--
+Installing a/aliased (dev-next)
+Marking a/aliased (4.1.0-RC2) as installed, alias of a/aliased (dev-next)
+Installing b/requirer (2.3.0)
+Installing a/aliased2 (dev-next)
+Marking a/aliased2 (4.1.0-RC2) as installed, alias of a/aliased2 (dev-next)
+Installing b/requirer2 (2.3.0)

tests/Composer/Test/Fixtures/installer/github-issues-4795-2.test

@@ -2,8 +2,8 @@
 
 See Github issue #4795 ( github.com/composer/composer/issues/4795 ).
 
-Composer\Installer::whitelistUpdateDependencies should not output a warning for dependencies that need to be updated
-that are also a root package, when that root package is also explicitly whitelisted.
+Composer\Installer::allowListUpdateDependencies should not output a warning for dependencies that need to be updated
+that are also a root package, when that root package is also explicitly allowed.
 
 --COMPOSER--
 {

tests/Composer/Test/Fixtures/installer/github-issues-4795.test

@@ -2,8 +2,8 @@
 
 See Github issue #4795 ( github.com/composer/composer/issues/4795 ).
 
-Composer\Installer::whitelistUpdateDependencies intentionally ignores root requirements even if said package is also a
-dependency of one the requirements that is whitelisted for update.
+Composer\Installer::allowListUpdateDependencies intentionally ignores root requirements even if said package is also a
+dependency of one the requirements that is allowed for update.
 
 --COMPOSER--
 {

tests/Composer/Test/Fixtures/installer/install-from-lock-removes-package.test

@@ -6,8 +6,8 @@ Install from a lock file that deleted a package
         {
             "type": "package",
             "package": [
-                { "name": "whitelisted/pkg", "version": "1.1.0" },
-                { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "fixed/dependency": "1.0.0", "old/dependency": "1.0.0" } },
+                { "name": "allowed/pkg", "version": "1.1.0" },
+                { "name": "allowed/pkg", "version": "1.0.0", "require": { "fixed/dependency": "1.0.0", "old/dependency": "1.0.0" } },
                 { "name": "fixed/dependency", "version": "1.1.0" },
                 { "name": "fixed/dependency", "version": "1.0.0" },
                 { "name": "old/dependency", "version": "1.0.0" }
@@ -15,14 +15,14 @@ Install from a lock file that deleted a package
         }
     ],
     "require": {
-        "whitelisted/pkg": "1.*",
+        "allowed/pkg": "1.*",
         "fixed/dependency": "1.*"
     }
 }
 --LOCK--
 {
     "packages": [
-        { "name": "whitelisted/pkg", "version": "1.1.0" },
+        { "name": "allowed/pkg", "version": "1.1.0" },
         { "name": "fixed/dependency", "version": "1.0.0" }
     ],
     "packages-dev": [],
@@ -33,7 +33,7 @@ Install from a lock file that deleted a package
 }
 --INSTALLED--
 [
-    { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "old/dependency": "1.0.0", "fixed/dependency": "1.0.0" } },
+    { "name": "allowed/pkg", "version": "1.0.0", "require": { "old/dependency": "1.0.0", "fixed/dependency": "1.0.0" } },
     { "name": "fixed/dependency", "version": "1.0.0" },
     { "name": "old/dependency", "version": "1.0.0" }
 ]
@@ -41,4 +41,4 @@ Install from a lock file that deleted a package
 install
 --EXPECT--
 Removing old/dependency (1.0.0)
-Upgrading whitelisted/pkg (1.0.0 => 1.1.0)
+Upgrading allowed/pkg (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/partial-update-forces-dev-reference-from-lock-for-non-updated-packages.test

@@ -1,5 +1,5 @@
 --TEST--
-Partial update forces updates dev reference from lock file for non whitelisted packages
+Partial update forces updates dev reference from lock file for non allowed packages
 --COMPOSER--
 {
     "repositories": [

tests/Composer/Test/Fixtures/installer/update-allow-list-locked-require.test

@@ -1,13 +1,13 @@
 --TEST--
-Update with a package whitelist only updates those packages if they are not present in composer.json
+Update with a package allow list only updates those packages if they are not present in composer.json
 --COMPOSER--
 {
     "repositories": [
         {
             "type": "package",
             "package": [
-                { "name": "whitelisted/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0", "fixed/dependency": "1.*" } },
-                { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0", "fixed/dependency": "1.*" } },
+                { "name": "allowed/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0", "fixed/dependency": "1.*" } },
+                { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0", "fixed/dependency": "1.*" } },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "fixed/dependency", "version": "1.1.0", "require": { "fixed/sub-dependency": "1.*" } },
@@ -18,13 +18,13 @@ Update with a package whitelist only updates those packages if they are not pres
         }
     ],
     "require": {
-        "whitelisted/pkg": "1.*",
+        "allowed/pkg": "1.*",
         "fixed/dependency": "1.*"
     }
 }
 --INSTALLED--
 [
-    { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0", "fixed/dependency": "1.*" } },
+    { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0", "fixed/dependency": "1.*" } },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "fixed/dependency", "version": "1.0.0", "require": { "fixed/sub-dependency": "1.*" } },
     { "name": "fixed/sub-dependency", "version": "1.0.0" }
@@ -32,7 +32,7 @@ Update with a package whitelist only updates those packages if they are not pres
 --LOCK--
 {
     "packages": [
-        { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0", "fixed/dependency": "1.*" } },
+        { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0", "fixed/dependency": "1.*" } },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "fixed/dependency", "version": "1.0.0", "require": { "fixed/sub-dependency": "1.*" } },
         { "name": "fixed/sub-dependency", "version": "1.0.0" }
@@ -47,7 +47,7 @@ Update with a package whitelist only updates those packages if they are not pres
     "platform-dev": []
 }
 --RUN--
-update whitelisted/pkg dependency/pkg
+update allowed/pkg dependency/pkg
 --EXPECT--
 Upgrading dependency/pkg (1.0.0 => 1.1.0)
-Upgrading whitelisted/pkg (1.0.0 => 1.1.0)
+Upgrading allowed/pkg (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-allow-list-patterns-with-all-dependencies.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist pattern and all-dependencies flag updates packages and their dependencies, even if defined as root dependency, matching the pattern
+Update with a package allow list pattern and all-dependencies flag updates packages and their dependencies, even if defined as root dependency, matching the pattern
 --COMPOSER--
 {
     "repositories": [
@@ -8,10 +8,10 @@ Update with a package whitelist pattern and all-dependencies flag updates packag
             "package": [
                 { "name": "fixed/pkg", "version": "1.1.0" },
                 { "name": "fixed/pkg", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component1", "version": "1.1.0" },
-                { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.*" } },
-                { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
+                { "name": "allowed/pkg-component1", "version": "1.1.0" },
+                { "name": "allowed/pkg-component1", "version": "1.0.0" },
+                { "name": "allowed/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.*" } },
+                { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "unrelated/pkg", "version": "1.1.0", "require": { "unrelated/pkg-dependency": "1.*" }  },
@@ -23,8 +23,8 @@ Update with a package whitelist pattern and all-dependencies flag updates packag
     ],
     "require": {
         "fixed/pkg": "1.*",
-        "whitelisted/pkg-component1": "1.*",
-        "whitelisted/pkg-component2": "1.*",
+        "allowed/pkg-component1": "1.*",
+        "allowed/pkg-component2": "1.*",
         "dependency/pkg": "1.*",
         "unrelated/pkg": "1.*"
     }
@@ -32,8 +32,8 @@ Update with a package whitelist pattern and all-dependencies flag updates packag
 --INSTALLED--
 [
     { "name": "fixed/pkg", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+    { "name": "allowed/pkg-component1", "version": "1.0.0" },
+    { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
     { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -42,8 +42,8 @@ Update with a package whitelist pattern and all-dependencies flag updates packag
 {
     "packages": [
         { "name": "fixed/pkg", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+        { "name": "allowed/pkg-component1", "version": "1.0.0" },
+        { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
         { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -58,8 +58,8 @@ Update with a package whitelist pattern and all-dependencies flag updates packag
     "platform-dev": []
 }
 --RUN--
-update whitelisted/pkg-* --with-all-dependencies
+update allowed/pkg-* --with-all-dependencies
 --EXPECT--
-Upgrading whitelisted/pkg-component1 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component1 (1.0.0 => 1.1.0)
 Upgrading dependency/pkg (1.0.0 => 1.1.0)
-Upgrading whitelisted/pkg-component2 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component2 (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-allow-list-patterns-with-dependencies.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist only updates those packages and their dependencies matching the pattern but no dependencies defined as roo package
+Update with a package allow list only updates those packages and their dependencies matching the pattern but no dependencies defined as roo package
 --COMPOSER--
 {
     "repositories": [
@@ -8,10 +8,10 @@ Update with a package whitelist only updates those packages and their dependenci
             "package": [
                 { "name": "fixed/pkg", "version": "1.1.0" },
                 { "name": "fixed/pkg", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component1", "version": "1.1.0" },
-                { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.*", "root/pkg-dependency": "1.*" } },
-                { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.*", "root/pkg-dependency": "1.*" } },
+                { "name": "allowed/pkg-component1", "version": "1.1.0" },
+                { "name": "allowed/pkg-component1", "version": "1.0.0" },
+                { "name": "allowed/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.*", "root/pkg-dependency": "1.*" } },
+                { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.*", "root/pkg-dependency": "1.*" } },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "root/pkg-dependency", "version": "1.1.0" },
@@ -25,8 +25,8 @@ Update with a package whitelist only updates those packages and their dependenci
     ],
     "require": {
         "fixed/pkg": "1.*",
-        "whitelisted/pkg-component1": "1.*",
-        "whitelisted/pkg-component2": "1.*",
+        "allowed/pkg-component1": "1.*",
+        "allowed/pkg-component2": "1.*",
         "root/pkg-dependency": "1.*",
         "unrelated/pkg": "1.*"
     }
@@ -34,8 +34,8 @@ Update with a package whitelist only updates those packages and their dependenci
 --INSTALLED--
 [
     { "name": "fixed/pkg", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+    { "name": "allowed/pkg-component1", "version": "1.0.0" },
+    { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
     { "name": "root/pkg-dependency", "version": "1.0.0" },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
@@ -45,8 +45,8 @@ Update with a package whitelist only updates those packages and their dependenci
 {
     "packages": [
         { "name": "fixed/pkg", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+        { "name": "allowed/pkg-component1", "version": "1.0.0" },
+        { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
         { "name": "root/pkg-dependency", "version": "1.0.0" },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
@@ -60,8 +60,8 @@ Update with a package whitelist only updates those packages and their dependenci
     "prefer-lowest": false
 }
 --RUN--
-update whitelisted/pkg-* --with-dependencies
+update allowed/pkg-* --with-dependencies
 --EXPECT--
-Upgrading whitelisted/pkg-component1 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component1 (1.0.0 => 1.1.0)
 Upgrading dependency/pkg (1.0.0 => 1.1.0)
-Upgrading whitelisted/pkg-component2 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component2 (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-allow-list-patterns-with-root-dependencies.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist only updates those packages and their dependencies matching the pattern
+Update with a package allow list only updates those packages and their dependencies matching the pattern
 --COMPOSER--
 {
     "repositories": [
@@ -8,16 +8,16 @@ Update with a package whitelist only updates those packages and their dependenci
             "package": [
                 { "name": "fixed/pkg", "version": "1.1.0" },
                 { "name": "fixed/pkg", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component1", "version": "1.1.0", "require": { "whitelisted/pkg-component2": "1.1.0" } },
-                { "name": "whitelisted/pkg-component1", "version": "1.0.0", "require": { "whitelisted/pkg-component2": "1.0.0" } },
-                { "name": "whitelisted/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0", "whitelisted/pkg-component5": "1.0.0" } },
-                { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
-                { "name": "whitelisted/pkg-component3", "version": "1.1.0", "require": { "whitelisted/pkg-component4": "1.1.0" } },
-                { "name": "whitelisted/pkg-component3", "version": "1.0.0", "require": { "whitelisted/pkg-component4": "1.0.0" } },
-                { "name": "whitelisted/pkg-component4", "version": "1.1.0" },
-                { "name": "whitelisted/pkg-component4", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component5", "version": "1.1.0" },
-                { "name": "whitelisted/pkg-component5", "version": "1.0.0" },
+                { "name": "allowed/pkg-component1", "version": "1.1.0", "require": { "allowed/pkg-component2": "1.1.0" } },
+                { "name": "allowed/pkg-component1", "version": "1.0.0", "require": { "allowed/pkg-component2": "1.0.0" } },
+                { "name": "allowed/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0", "allowed/pkg-component5": "1.0.0" } },
+                { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+                { "name": "allowed/pkg-component3", "version": "1.1.0", "require": { "allowed/pkg-component4": "1.1.0" } },
+                { "name": "allowed/pkg-component3", "version": "1.0.0", "require": { "allowed/pkg-component4": "1.0.0" } },
+                { "name": "allowed/pkg-component4", "version": "1.1.0" },
+                { "name": "allowed/pkg-component4", "version": "1.0.0" },
+                { "name": "allowed/pkg-component5", "version": "1.1.0" },
+                { "name": "allowed/pkg-component5", "version": "1.0.0" },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "unrelated/pkg", "version": "1.1.0", "require": { "unrelated/pkg-dependency": "1.*" }  },
@@ -29,20 +29,20 @@ Update with a package whitelist only updates those packages and their dependenci
     ],
     "require": {
         "fixed/pkg": "1.*",
-        "whitelisted/pkg-component1": "1.*",
-        "whitelisted/pkg-component2": "1.*",
-        "whitelisted/pkg-component3": "1.0.0",
+        "allowed/pkg-component1": "1.*",
+        "allowed/pkg-component2": "1.*",
+        "allowed/pkg-component3": "1.0.0",
         "unrelated/pkg": "1.*"
     }
 }
 --INSTALLED--
 [
     { "name": "fixed/pkg", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component1", "version": "1.0.0", "require": { "whitelisted/pkg-component2": "1.0.0" } },
-    { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
-    { "name": "whitelisted/pkg-component3", "version": "1.0.0", "require": { "whitelisted/pkg-component4": "1.0.0" } },
-    { "name": "whitelisted/pkg-component4", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component5", "version": "1.0.0" },
+    { "name": "allowed/pkg-component1", "version": "1.0.0", "require": { "allowed/pkg-component2": "1.0.0" } },
+    { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+    { "name": "allowed/pkg-component3", "version": "1.0.0", "require": { "allowed/pkg-component4": "1.0.0" } },
+    { "name": "allowed/pkg-component4", "version": "1.0.0" },
+    { "name": "allowed/pkg-component5", "version": "1.0.0" },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
     { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -51,11 +51,11 @@ Update with a package whitelist only updates those packages and their dependenci
 {
     "packages": [
         { "name": "fixed/pkg", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component1", "version": "1.0.0", "require": { "whitelisted/pkg-component2": "1.0.0" } },
-        { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
-        { "name": "whitelisted/pkg-component3", "version": "1.0.0", "require": { "whitelisted/pkg-component4": "1.0.0" } },
-        { "name": "whitelisted/pkg-component4", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component5", "version": "1.0.0" },
+        { "name": "allowed/pkg-component1", "version": "1.0.0", "require": { "allowed/pkg-component2": "1.0.0" } },
+        { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+        { "name": "allowed/pkg-component3", "version": "1.0.0", "require": { "allowed/pkg-component4": "1.0.0" } },
+        { "name": "allowed/pkg-component4", "version": "1.0.0" },
+        { "name": "allowed/pkg-component5", "version": "1.0.0" },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
         { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -70,8 +70,8 @@ Update with a package whitelist only updates those packages and their dependenci
     "platform-dev": []
 }
 --RUN--
-update whitelisted/pkg-* foobar --with-dependencies
+update allowed/pkg-* foobar --with-dependencies
 --EXPECT--
 Upgrading dependency/pkg (1.0.0 => 1.1.0)
-Upgrading whitelisted/pkg-component2 (1.0.0 => 1.1.0)
-Upgrading whitelisted/pkg-component1 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component2 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component1 (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-allow-list-patterns-without-dependencies.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist only updates those packages matching the pattern
+Update with a package allow list only updates those packages matching the pattern
 --COMPOSER--
 {
     "repositories": [
@@ -8,10 +8,10 @@ Update with a package whitelist only updates those packages matching the pattern
             "package": [
                 { "name": "fixed/pkg", "version": "1.1.0" },
                 { "name": "fixed/pkg", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component1", "version": "1.1.0" },
-                { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-                { "name": "whitelisted/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.*" } },
-                { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
+                { "name": "allowed/pkg-component1", "version": "1.1.0" },
+                { "name": "allowed/pkg-component1", "version": "1.0.0" },
+                { "name": "allowed/pkg-component2", "version": "1.1.0", "require": { "dependency/pkg": "1.*" } },
+                { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "unrelated/pkg", "version": "1.1.0", "require": { "unrelated/pkg-dependency": "1.*" }  },
@@ -23,16 +23,16 @@ Update with a package whitelist only updates those packages matching the pattern
     ],
     "require": {
         "fixed/pkg": "1.*",
-        "whitelisted/pkg-component1": "1.*",
-        "whitelisted/pkg-component2": "1.*",
+        "allowed/pkg-component1": "1.*",
+        "allowed/pkg-component2": "1.*",
         "unrelated/pkg": "1.*"
     }
 }
 --INSTALLED--
 [
     { "name": "fixed/pkg", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-    { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+    { "name": "allowed/pkg-component1", "version": "1.0.0" },
+    { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
     { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -41,8 +41,8 @@ Update with a package whitelist only updates those packages matching the pattern
 {
     "packages": [
         { "name": "fixed/pkg", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component1", "version": "1.0.0" },
-        { "name": "whitelisted/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+        { "name": "allowed/pkg-component1", "version": "1.0.0" },
+        { "name": "allowed/pkg-component2", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
         { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -55,7 +55,7 @@ Update with a package whitelist only updates those packages matching the pattern
     "prefer-lowest": false
 }
 --RUN--
-update whitelisted/pkg-*
+update allowed/pkg-*
 --EXPECT--
-Upgrading whitelisted/pkg-component1 (1.0.0 => 1.1.0)
-Upgrading whitelisted/pkg-component2 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component1 (1.0.0 => 1.1.0)
+Upgrading allowed/pkg-component2 (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-allow-list-patterns.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist only updates those corresponding to the pattern
+Update with a package allow list only updates those corresponding to the pattern
 --COMPOSER--
 {
     "repositories": [

tests/Composer/Test/Fixtures/installer/update-allow-list-removes-unused.test

@@ -1,13 +1,13 @@
 --TEST--
-Update with a package whitelist removes unused packages
+Update with a package allow list removes unused packages
 --COMPOSER--
 {
     "repositories": [
         {
             "type": "package",
             "package": [
-                { "name": "whitelisted/pkg", "version": "1.1.0" },
-                { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "fixed/dependency": "1.0.0", "old/dependency": "1.0.0" } },
+                { "name": "allowed/pkg", "version": "1.1.0" },
+                { "name": "allowed/pkg", "version": "1.0.0", "require": { "fixed/dependency": "1.0.0", "old/dependency": "1.0.0" } },
                 { "name": "fixed/dependency", "version": "1.1.0" },
                 { "name": "fixed/dependency", "version": "1.0.0" },
                 { "name": "old/dependency", "version": "1.0.0" }
@@ -15,20 +15,20 @@ Update with a package whitelist removes unused packages
         }
     ],
     "require": {
-        "whitelisted/pkg": "1.*",
+        "allowed/pkg": "1.*",
         "fixed/dependency": "1.*"
     }
 }
 --INSTALLED--
 [
-    { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "old/dependency": "1.0.0", "fixed/dependency": "1.0.0" } },
+    { "name": "allowed/pkg", "version": "1.0.0", "require": { "old/dependency": "1.0.0", "fixed/dependency": "1.0.0" } },
     { "name": "fixed/dependency", "version": "1.0.0" },
     { "name": "old/dependency", "version": "1.0.0" }
 ]
 --LOCK--
 {
     "packages": [
-        { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "old/dependency": "1.0.0", "fixed/dependency": "1.0.0" } },
+        { "name": "allowed/pkg", "version": "1.0.0", "require": { "old/dependency": "1.0.0", "fixed/dependency": "1.0.0" } },
         { "name": "fixed/dependency", "version": "1.0.0" },
         { "name": "old/dependency", "version": "1.0.0" }
     ],
@@ -42,7 +42,7 @@ Update with a package whitelist removes unused packages
     "platform-dev": []
 }
 --RUN--
-update --with-dependencies whitelisted/pkg
+update --with-dependencies allowed/pkg
 --EXPECT--
 Removing old/dependency (1.0.0)
-Upgrading whitelisted/pkg (1.0.0 => 1.1.0)
+Upgrading allowed/pkg (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-allow-list-with-dependencies.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist only updates those packages and their dependencies listed as command arguments
+Update with a package allow list only updates those packages and their dependencies listed as command arguments
 --COMPOSER--
 {
     "repositories": [
@@ -8,8 +8,8 @@ Update with a package whitelist only updates those packages and their dependenci
             "package": [
                 { "name": "fixed/pkg", "version": "1.1.0" },
                 { "name": "fixed/pkg", "version": "1.0.0" },
-                { "name": "whitelisted/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0" } },
-                { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+                { "name": "allowed/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0" } },
+                { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "unrelated/pkg", "version": "1.1.0", "require": { "unrelated/pkg-dependency": "1.*" }  },
@@ -21,14 +21,14 @@ Update with a package whitelist only updates those packages and their dependenci
     ],
     "require": {
         "fixed/pkg": "1.*",
-        "whitelisted/pkg": "1.*",
+        "allowed/pkg": "1.*",
         "unrelated/pkg": "1.*"
     }
 }
 --INSTALLED--
 [
     { "name": "fixed/pkg", "version": "1.0.0" },
-    { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+    { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
     { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -37,7 +37,7 @@ Update with a package whitelist only updates those packages and their dependenci
 {
     "packages": [
         { "name": "fixed/pkg", "version": "1.0.0" },
-        { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+        { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
         { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -50,7 +50,7 @@ Update with a package whitelist only updates those packages and their dependenci
     "prefer-lowest": false
 }
 --RUN--
-update whitelisted/pkg --with-dependencies
+update allowed/pkg --with-dependencies
 --EXPECT--
 Upgrading dependency/pkg (1.0.0 => 1.1.0)
-Upgrading whitelisted/pkg (1.0.0 => 1.1.0)
+Upgrading allowed/pkg (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-allow-list-with-dependency-conflict.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist only updates whitelisted packages if no dependency conflicts
+Update with a package allow list only updates allowed packages if no dependency conflicts
 --COMPOSER--
 {
     "repositories": [
@@ -8,8 +8,8 @@ Update with a package whitelist only updates whitelisted packages if no dependen
             "package": [
                 { "name": "fixed/pkg", "version": "1.1.0" },
                 { "name": "fixed/pkg", "version": "1.0.0" },
-                { "name": "whitelisted/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0" } },
-                { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+                { "name": "allowed/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.1.0" } },
+                { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "unrelated/pkg", "version": "1.1.0", "require": { "unrelated/pkg-dependency": "1.*" }  },
@@ -21,14 +21,14 @@ Update with a package whitelist only updates whitelisted packages if no dependen
     ],
     "require": {
         "fixed/pkg": "1.*",
-        "whitelisted/pkg": "1.*",
+        "allowed/pkg": "1.*",
         "unrelated/pkg": "1.*"
     }
 }
 --INSTALLED--
 [
     { "name": "fixed/pkg", "version": "1.0.0" },
-    { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+    { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
     { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -37,7 +37,7 @@ Update with a package whitelist only updates whitelisted packages if no dependen
 {
     "packages": [
         { "name": "fixed/pkg", "version": "1.0.0" },
-        { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
+        { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.0.0" } },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
         { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -50,5 +50,5 @@ Update with a package whitelist only updates whitelisted packages if no dependen
     "prefer-lowest": false
 }
 --RUN--
-update whitelisted/pkg
+update allowed/pkg
 --EXPECT--

tests/Composer/Test/Fixtures/installer/update-allow-list.test

@@ -1,5 +1,5 @@
 --TEST--
-Update with a package whitelist only updates those packages listed as command arguments
+Update with a package allow list only updates those packages listed as command arguments
 --COMPOSER--
 {
     "repositories": [
@@ -8,8 +8,8 @@ Update with a package whitelist only updates those packages listed as command ar
             "package": [
                 { "name": "fixed/pkg", "version": "1.1.0" },
                 { "name": "fixed/pkg", "version": "1.0.0" },
-                { "name": "whitelisted/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.*" } },
-                { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
+                { "name": "allowed/pkg", "version": "1.1.0", "require": { "dependency/pkg": "1.*" } },
+                { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
                 { "name": "dependency/pkg", "version": "1.1.0" },
                 { "name": "dependency/pkg", "version": "1.0.0" },
                 { "name": "unrelated/pkg", "version": "1.1.0", "require": { "unrelated/pkg-dependency": "1.*" }  },
@@ -21,14 +21,14 @@ Update with a package whitelist only updates those packages listed as command ar
     ],
     "require": {
         "fixed/pkg": "1.*",
-        "whitelisted/pkg": "1.*",
+        "allowed/pkg": "1.*",
         "unrelated/pkg": "1.*"
     }
 }
 --INSTALLED--
 [
     { "name": "fixed/pkg", "version": "1.0.0" },
-    { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency": "1.*" } },
+    { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency": "1.*" } },
     { "name": "dependency/pkg", "version": "1.0.0" },
     { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated-dependency": "1.*" } },
     { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -37,7 +37,7 @@ Update with a package whitelist only updates those packages listed as command ar
 {
     "packages": [
         { "name": "fixed/pkg", "version": "1.0.0" },
-        { "name": "whitelisted/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
+        { "name": "allowed/pkg", "version": "1.0.0", "require": { "dependency/pkg": "1.*" } },
         { "name": "dependency/pkg", "version": "1.0.0" },
         { "name": "unrelated/pkg", "version": "1.0.0", "require": { "unrelated/pkg-dependency": "1.*" } },
         { "name": "unrelated/pkg-dependency", "version": "1.0.0" }
@@ -52,6 +52,6 @@ Update with a package whitelist only updates those packages listed as command ar
     "platform-dev": []
 }
 --RUN--
-update whitelisted/pkg
+update allowed/pkg
 --EXPECT--
-Upgrading whitelisted/pkg (1.0.0 => 1.1.0)
+Upgrading allowed/pkg (1.0.0 => 1.1.0)

tests/Composer/Test/Fixtures/installer/update-changes-url.test

@@ -3,10 +3,10 @@ Update updates URLs for updated packages if they have changed
 
 a/a is dev and gets everything updated as it updates to a new ref
 b/b is a tag and gets everything updated by updating the package URL directly
-c/c is a tag and not whitelisted and remains unchanged
+c/c is a tag and not allowlisted and remains unchanged
 d/d is dev but with a #ref so it should get URL updated but not the reference
 e/e is dev and newly installed with a #ref so it should get the correct URL but with the #111 ref
-f/f is dev but not whitelisted and remains unchanged
+f/f is dev but not allowlisted and remains unchanged
 g/g is dev and installed in a different ref than the #ref, so it gets updated and gets the new URL but not the new ref
 --COMPOSER--
 {

tests/Composer/Test/Fixtures/installer/update-with-all-dependencies.test

@@ -2,7 +2,7 @@
 
 See Github issue #6661 ( github.com/composer/composer/issues/6661 ).
 
-When `--with-all-dependencies` is used, Composer\Installer::whitelistUpdateDependencies should update the dependencies of all whitelisted packages, even if the dependency is a root requirement.
+When `--with-all-dependencies` is used, Composer should update the dependencies of all allowed packages, even if the dependency is a root requirement.
 
 --COMPOSER--
 {

tests/Composer/Test/Mock/FactoryMock.php

@@ -23,6 +23,7 @@ use Composer\EventDispatcher\EventDispatcher;
 use Composer\IO\IOInterface;
 use Composer\Test\TestCase;
 use Composer\Util\Loop;
+use Composer\Util\ProcessExecutor;
 
 class FactoryMock extends Factory
 {
@@ -47,7 +48,7 @@ class FactoryMock extends Factory
         return new InstallationManagerMock();
     }
 
-    protected function createDefaultInstallers(Installer\InstallationManager $im, Composer $composer, IOInterface $io)
+    protected function createDefaultInstallers(Installer\InstallationManager $im, Composer $composer, IOInterface $io, ProcessExecutor $process = null)
     {
     }
 

tests/Composer/Test/Package/Archiver/ArchiveManagerTest.php

@@ -18,6 +18,7 @@ use Composer\Package\Archiver\ArchiveManager;
 use Composer\Package\PackageInterface;
 use Composer\Util\Loop;
 use Composer\Test\Mock\FactoryMock;
+use Composer\Util\ProcessExecutor;
 
 class ArchiveManagerTest extends ArchiverTest
 {
@@ -36,7 +37,8 @@ class ArchiveManagerTest extends ArchiverTest
         $dm = $factory->createDownloadManager(
             $io = new NullIO,
             $config = FactoryMock::createConfig(),
-            $httpDownloader = $factory->createHttpDownloader($io, $config)
+            $httpDownloader = $factory->createHttpDownloader($io, $config),
+            new ProcessExecutor($io)
         );
         $loop = new Loop($httpDownloader);
         $this->manager = $factory->createArchiveManager($factory->createConfig(), $dm, $loop);

tests/Composer/Test/Package/BasePackageTest.php

@@ -81,7 +81,7 @@ class BasePackageTest extends TestCase
         $createPackage = function ($arr) use ($self) {
             $package = $self->getMockForAbstractClass('\Composer\Package\BasePackage', array(), '', false);
             $package->expects($self->once())->method('isDev')->will($self->returnValue(true));
-            $package->expects($self->once())->method('getSourceType')->will($self->returnValue('git'));
+            $package->expects($self->any())->method('getSourceType')->will($self->returnValue('git'));
             $package->expects($self->once())->method('getPrettyVersion')->will($self->returnValue('PrettyVersion'));
             $package->expects($self->any())->method('getSourceReference')->will($self->returnValue($arr['sourceReference']));
 

tests/Composer/Test/Repository/ComposerRepositoryTest.php

@@ -189,16 +189,19 @@ class ComposerRepositoryTest extends TestCase
             ->getMock();
 
         $httpDownloader->expects($this->at(0))
+            ->method('enableAsync');
+
+        $httpDownloader->expects($this->at(1))
             ->method('get')
             ->with($url = 'http://example.org/packages.json')
             ->willReturn(new \Composer\Util\Http\Response(array('url' => $url), 200, array(), json_encode(array('search' => '/search.json?q=%query%&type=%type%'))));
 
-        $httpDownloader->expects($this->at(1))
+        $httpDownloader->expects($this->at(2))
             ->method('get')
             ->with($url = 'http://example.org/search.json?q=foo&type=composer-plugin')
             ->willReturn(new \Composer\Util\Http\Response(array('url' => $url), 200, array(), json_encode($result)));
 
-        $httpDownloader->expects($this->at(2))
+        $httpDownloader->expects($this->at(3))
             ->method('get')
             ->with($url = 'http://example.org/search.json?q=foo&type=library')
             ->willReturn(new \Composer\Util\Http\Response(array('url' => $url), 200, array(), json_encode(array())));
@@ -291,6 +294,9 @@ class ComposerRepositoryTest extends TestCase
             ->getMock();
 
         $httpDownloader->expects($this->at(0))
+            ->method('enableAsync');
+
+        $httpDownloader->expects($this->at(1))
             ->method('get')
             ->with($url = 'http://example.org/packages.json')
             ->willReturn(new \Composer\Util\Http\Response(array('url' => $url), 200, array(), json_encode(array(

tests/Composer/Test/Repository/PlatformRepositoryTest.php

@@ -14,11 +14,15 @@ namespace Composer\Test\Repository;
 
 use Composer\Repository\PlatformRepository;
 use Composer\Test\TestCase;
+use Composer\Util\ProcessExecutor;
+use Composer\Package\Version\VersionParser;
 use Composer\Util\Platform;
 use Symfony\Component\Process\ExecutableFinder;
 
-class PlatformRepositoryTest extends TestCase {
-    public function testHHVMVersionWhenExecutingInHHVM() {
+class PlatformRepositoryTest extends TestCase
+{
+    public function testHHVMVersionWhenExecutingInHHVM()
+    {
         if (!defined('HHVM_VERSION_ID')) {
             $this->markTestSkipped('Not running with HHVM');
             return;
@@ -36,7 +40,8 @@ class PlatformRepositoryTest extends TestCase {
         );
     }
 
-    public function testHHVMVersionWhenExecutingInPHP() {
+    public function testHHVMVersionWhenExecutingInPHP()
+    {
         if (defined('HHVM_VERSION_ID')) {
             $this->markTestSkipped('Running with HHVM');
             return;
@@ -54,17 +59,18 @@ class PlatformRepositoryTest extends TestCase {
         if ($hhvm === null) {
             $this->markTestSkipped('HHVM is not installed');
         }
-        $process = $this->getMockBuilder('Composer\Util\ProcessExecutor')->getMock();
-        $process->expects($this->once())->method('execute')->will($this->returnCallback(
-            function($command, &$out) {
-                $this->assertContains('HHVM_VERSION', $command);
-                $out = '4.0.1-dev';
-                return 0;
-            }
-        ));
-        $repository = new PlatformRepository(array(), array(), $process);
+        $repository = new PlatformRepository(array(), array());
         $package = $repository->findPackage('hhvm', '*');
         $this->assertNotNull($package, 'failed to find HHVM package');
-        $this->assertSame('4.0.1.0-dev', $package->getVersion());
+
+        $process = new ProcessExecutor();
+        $exitCode = $process->execute(
+            ProcessExecutor::escape($hhvm).
+            ' --php -d hhvm.jit=0 -r "echo HHVM_VERSION;" 2>/dev/null',
+            $version
+        );
+        $parser = new VersionParser;
+
+        $this->assertSame($parser->normalize($version), $package->getVersion());
     }
 }

tests/Composer/Test/Util/RemoteFilesystemTest.php

@@ -12,32 +12,25 @@
 
 namespace Composer\Test\Util;
 
+use Composer\Config;
+use Composer\IO\ConsoleIO;
+use Composer\IO\IOInterface;
+use Composer\Util\AuthHelper;
 use Composer\Util\RemoteFilesystem;
 use Composer\Test\TestCase;
+use PHPUnit\Framework\MockObject\MockObject;
+use ReflectionMethod;
+use ReflectionProperty;
 
 class RemoteFilesystemTest extends TestCase
 {
-    private function getConfigMock()
-    {
-        $config = $this->getMockBuilder('Composer\Config')->getMock();
-        $config->expects($this->any())
-            ->method('get')
-            ->will($this->returnCallback(function ($key) {
-                if ($key === 'github-domains' || $key === 'gitlab-domains') {
-                    return array();
-                }
-            }));
-
-        return $config;
-    }
-
     public function testGetOptionsForUrl()
     {
-        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $io = $this->getIOInterfaceMock();
         $io
             ->expects($this->once())
             ->method('hasAuthentication')
-            ->will($this->returnValue(false))
+            ->willReturn(false)
         ;
 
         $res = $this->callGetOptionsForUrl($io, array('http://example.org', array()));
@@ -46,16 +39,16 @@ class RemoteFilesystemTest extends TestCase
 
     public function testGetOptionsForUrlWithAuthorization()
     {
-        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $io = $this->getIOInterfaceMock();
         $io
             ->expects($this->once())
             ->method('hasAuthentication')
-            ->will($this->returnValue(true))
+            ->willReturn(true)
         ;
         $io
             ->expects($this->once())
             ->method('getAuthentication')
-            ->will($this->returnValue(array('username' => 'login', 'password' => 'password')))
+            ->willReturn(array('username' => 'login', 'password' => 'password'))
         ;
 
         $options = $this->callGetOptionsForUrl($io, array('http://example.org', array()));
@@ -71,17 +64,17 @@ class RemoteFilesystemTest extends TestCase
 
     public function testGetOptionsForUrlWithStreamOptions()
     {
-        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $io = $this->getIOInterfaceMock();
         $io
             ->expects($this->once())
             ->method('hasAuthentication')
-            ->will($this->returnValue(true))
+            ->willReturn(true)
         ;
 
         $io
             ->expects($this->once())
             ->method('getAuthentication')
-            ->will($this->returnValue(array('username' => null, 'password' => null)))
+            ->willReturn(array('username' => null, 'password' => null))
         ;
 
         $streamOptions = array('ssl' => array(
@@ -94,17 +87,17 @@ class RemoteFilesystemTest extends TestCase
 
     public function testGetOptionsForUrlWithCallOptionsKeepsHeader()
     {
-        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $io = $this->getIOInterfaceMock();
         $io
             ->expects($this->once())
             ->method('hasAuthentication')
-            ->will($this->returnValue(true))
+            ->willReturn(true)
         ;
 
         $io
             ->expects($this->once())
             ->method('getAuthentication')
-            ->will($this->returnValue(array('username' => null, 'password' => null)))
+            ->willReturn(array('username' => null, 'password' => null))
         ;
 
         $streamOptions = array('http' => array(
@@ -127,14 +120,14 @@ class RemoteFilesystemTest extends TestCase
 
     public function testCallbackGetFileSize()
     {
-        $fs = new RemoteFilesystem($this->getMockBuilder('Composer\IO\IOInterface')->getMock(), $this->getConfigMock());
+        $fs = new RemoteFilesystem($this->getIOInterfaceMock(), $this->getConfigMock());
         $this->callCallbackGet($fs, STREAM_NOTIFY_FILE_SIZE_IS, 0, '', 0, 0, 20);
         $this->assertAttributeEquals(20, 'bytesMax', $fs);
     }
 
     public function testCallbackGetNotifyProgress()
     {
-        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $io = $this->getIOInterfaceMock();
         $io
             ->expects($this->once())
             ->method('overwriteError')
@@ -150,21 +143,21 @@ class RemoteFilesystemTest extends TestCase
 
     public function testCallbackGetPassesThrough404()
     {
-        $fs = new RemoteFilesystem($this->getMockBuilder('Composer\IO\IOInterface')->getMock(), $this->getConfigMock());
+        $fs = new RemoteFilesystem($this->getIOInterfaceMock(), $this->getConfigMock());
 
         $this->assertNull($this->callCallbackGet($fs, STREAM_NOTIFY_FAILURE, 0, 'HTTP/1.1 404 Not Found', 404, 0, 0));
     }
 
     public function testGetContents()
     {
-        $fs = new RemoteFilesystem($this->getMockBuilder('Composer\IO\IOInterface')->getMock(), $this->getConfigMock());
+        $fs = new RemoteFilesystem($this->getIOInterfaceMock(), $this->getConfigMock());
 
         $this->assertContains('testGetContents', $fs->getContents('http://example.org', 'file://'.__FILE__));
     }
 
     public function testCopy()
     {
-        $fs = new RemoteFilesystem($this->getMockBuilder('Composer\IO\IOInterface')->getMock(), $this->getConfigMock());
+        $fs = new RemoteFilesystem($this->getIOInterfaceMock(), $this->getConfigMock());
 
         $file = tempnam(sys_get_temp_dir(), 'c');
         $this->assertTrue($fs->copy('http://example.org', 'file://'.__FILE__, $file));
@@ -173,17 +166,96 @@ class RemoteFilesystemTest extends TestCase
         unlink($file);
     }
 
+    /**
+     * @expectedException \Composer\Downloader\TransportException
+     */
+    public function testCopyWithNoRetryOnFailure()
+    {
+        $fs = $this->getRemoteFilesystemWithMockedMethods(array('getRemoteContents'));
+
+        $fs->expects($this->once())->method('getRemoteContents')
+            ->willReturnCallback(function ($originUrl, $fileUrl, $ctx, &$http_response_header) {
+
+                $http_response_header = array('http/1.1 401 unauthorized');
+
+                return '';
+
+            });
+
+
+        $file = tempnam(sys_get_temp_dir(), 'z');
+        unlink($file);
+
+        $fs->copy(
+            'http://example.org',
+            'file://' . __FILE__,
+            $file,
+            true,
+            array('retry-auth-failure' => false)
+        );
+    }
+
+    public function testCopyWithSuccessOnRetry()
+    {
+        $authHelper = $this->getAuthHelperWithMockedMethods(array('promptAuthIfNeeded'));
+        $fs = $this->getRemoteFilesystemWithMockedMethods(array('getRemoteContents'), $authHelper);
+
+        $authHelper->expects($this->once())
+            ->method('promptAuthIfNeeded')
+            ->willReturn(array(
+                'storeAuth' => true,
+                'retry' => true
+            ));
+
+        $fs->expects($this->at(0))
+            ->method('getRemoteContents')
+            ->willReturnCallback(function ($originUrl, $fileUrl, $ctx, &$http_response_header) {
+
+                $http_response_header = array('http/1.1 401 unauthorized');
+
+                return '';
+
+            });
+
+        $fs->expects($this->at(1))
+            ->method('getRemoteContents')
+            ->willReturnCallback(function ($originUrl, $fileUrl, $ctx, &$http_response_header) {
+
+                $http_response_header = array('http/1.1 200 OK');
+
+                return '<?php $copied = "Copied"; ';
+
+            });
+
+
+        $file = tempnam(sys_get_temp_dir(), 'z');
+
+        $copyResult = $fs->copy(
+            'http://example.org',
+            'file://' . __FILE__,
+            $file,
+            true,
+            array('retry-auth-failure' => true)
+        );
+
+        $this->assertTrue($copyResult);
+        $this->assertFileExists($file);
+        $this->assertContains('Copied', file_get_contents($file));
+
+        unlink($file);
+    }
+
     /**
      * @group TLS
      */
     public function testGetOptionsForUrlCreatesSecureTlsDefaults()
     {
-        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $io = $this->getIOInterfaceMock();
 
         $res = $this->callGetOptionsForUrl($io, array('example.org', array('ssl' => array('cafile' => '/some/path/file.crt'))), array(), 'http://www.example.org');
 
         $this->assertTrue(isset($res['ssl']['ciphers']));
-        $this->assertRegExp("|!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA|", $res['ssl']['ciphers']);
+        $this->assertRegExp('|!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA|', $res['ssl']['ciphers']);
         $this->assertTrue($res['ssl']['verify_peer']);
         $this->assertTrue($res['ssl']['SNI_enabled']);
         $this->assertEquals(7, $res['ssl']['verify_depth']);
@@ -220,6 +292,7 @@ class RemoteFilesystemTest extends TestCase
      */
     public function testBitBucketPublicDownload($url, $contents)
     {
+        /** @var ConsoleIO $io */
         $io = $this
             ->getMockBuilder('Composer\IO\ConsoleIO')
             ->disableOriginalConstructor()
@@ -242,6 +315,7 @@ class RemoteFilesystemTest extends TestCase
      */
     public function testBitBucketPublicDownloadWithAuthConfigured($url, $contents)
     {
+        /** @var MockObject|ConsoleIO $io */
         $io = $this
             ->getMockBuilder('Composer\IO\ConsoleIO')
             ->disableOriginalConstructor()
@@ -249,13 +323,12 @@ class RemoteFilesystemTest extends TestCase
 
         $domains = array();
         $io
-            ->expects($this->any())
             ->method('hasAuthentication')
-            ->will($this->returnCallback(function ($arg) use (&$domains) {
+            ->willReturnCallback(function ($arg) use (&$domains) {
                 $domains[] = $arg;
                 // first time is called with bitbucket.org, then it redirects to bbuseruploads.s3.amazonaws.com so next time we have no auth configured
                 return $arg === 'bitbucket.org';
-            }));
+            });
         $io
             ->expects($this->at(1))
             ->method('getAuthentication')
@@ -275,11 +348,11 @@ class RemoteFilesystemTest extends TestCase
         $this->assertEquals(array('bitbucket.org', 'bbuseruploads.s3.amazonaws.com'), $domains);
     }
 
-    protected function callGetOptionsForUrl($io, array $args = array(), array $options = array(), $fileUrl = '')
+    private function callGetOptionsForUrl($io, array $args = array(), array $options = array(), $fileUrl = '')
     {
         $fs = new RemoteFilesystem($io, $this->getConfigMock(), $options);
-        $ref = new \ReflectionMethod($fs, 'getOptionsForUrl');
-        $prop = new \ReflectionProperty($fs, 'fileUrl');
+        $ref = new ReflectionMethod($fs, 'getOptionsForUrl');
+        $prop = new ReflectionProperty($fs, 'fileUrl');
         $ref->setAccessible(true);
         $prop->setAccessible(true);
 
@@ -288,17 +361,80 @@ class RemoteFilesystemTest extends TestCase
         return $ref->invokeArgs($fs, $args);
     }
 
-    protected function callCallbackGet(RemoteFilesystem $fs, $notificationCode, $severity, $message, $messageCode, $bytesTransferred, $bytesMax)
+    /**
+     * @return MockObject|Config
+     */
+    private function getConfigMock()
     {
-        $ref = new \ReflectionMethod($fs, 'callbackGet');
+        $config = $this->getMockBuilder('Composer\Config')->getMock();
+        $config
+            ->method('get')
+            ->willReturnCallback(function ($key) {
+                if ($key === 'github-domains' || $key === 'gitlab-domains') {
+                    return array();
+                }
+
+                return null;
+            });
+
+        return $config;
+    }
+
+    private function callCallbackGet(RemoteFilesystem $fs, $notificationCode, $severity, $message, $messageCode, $bytesTransferred, $bytesMax)
+    {
+        $ref = new ReflectionMethod($fs, 'callbackGet');
         $ref->setAccessible(true);
         $ref->invoke($fs, $notificationCode, $severity, $message, $messageCode, $bytesTransferred, $bytesMax);
     }
 
-    protected function setAttribute($object, $attribute, $value)
+    private function setAttribute($object, $attribute, $value)
     {
-        $attr = new \ReflectionProperty($object, $attribute);
+        $attr = new ReflectionProperty($object, $attribute);
         $attr->setAccessible(true);
         $attr->setValue($object, $value);
     }
+
+    /**
+     * @return MockObject|IOInterface
+     */
+    private function getIOInterfaceMock()
+    {
+        return $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+    }
+
+    /**
+     * @param array $mockedMethods
+     * @param AuthHelper $authHelper
+     *
+     * @return RemoteFilesystem|MockObject
+     */
+    private function getRemoteFilesystemWithMockedMethods(array $mockedMethods, AuthHelper $authHelper = null)
+    {
+        return $this->getMockBuilder('Composer\Util\RemoteFilesystem')
+            ->setConstructorArgs(array(
+                $this->getIOInterfaceMock(),
+                $this->getConfigMock(),
+                array(),
+                false,
+                $authHelper
+            ))
+            ->setMethods($mockedMethods)
+            ->getMock();
+    }
+
+    /**
+     * @param array $mockedMethods
+     *
+     * @return AuthHelper|MockObject
+     */
+    private function getAuthHelperWithMockedMethods(array $mockedMethods)
+    {
+        return $this->getMockBuilder('Composer\Util\AuthHelper')
+            ->setConstructorArgs(array(
+                $this->getIOInterfaceMock(),
+                $this->getConfigMock()
+            ))
+            ->setMethods($mockedMethods)
+            ->getMock();
+    }
 }