Add completion on commands

src/Composer/Command/ArchiveCommand.php

@@ -27,6 +27,8 @@ use Composer\Util\Filesystem;
 use Composer\Util\Loop;
 use Composer\Util\Platform;
 use Composer\Util\ProcessExecutor;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -39,6 +41,17 @@ use Symfony\Component\Console\Output\OutputInterface;
  */
 class ArchiveCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        if ($this->completeAvailablePackage($input, $suggestions)) {
+            return;
+        }
+
+        if ($input->mustSuggestOptionValuesFor('format')) {
+            $suggestions->suggestValues(['tar', 'tar.gz', 'tar.bz2', 'zip']);
+        }
+    }
+
     /**
      * @return void
      */

src/Composer/Command/BaseCommand.php

@@ -20,10 +20,19 @@ use Composer\Filter\PlatformRequirementFilter\PlatformRequirementFilterFactory;
 use Composer\Filter\PlatformRequirementFilter\PlatformRequirementFilterInterface;
 use Composer\IO\IOInterface;
 use Composer\IO\NullIO;
+use Composer\Package\Package;
+use Composer\Package\PackageInterface;
 use Composer\Plugin\PreCommandRunEvent;
 use Composer\Package\Version\VersionParser;
 use Composer\Plugin\PluginEvents;
+use Composer\Repository\CompositeRepository;
+use Composer\Repository\InstalledRepository;
+use Composer\Repository\PlatformRepository;
+use Composer\Repository\RepositoryInterface;
+use Composer\Repository\RootPackageRepository;
 use Composer\Util\Platform;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Helper\Table;
 use Symfony\Component\Console\Helper\TableSeparator;
 use Symfony\Component\Console\Input\InputInterface;
@@ -317,7 +326,96 @@ abstract class BaseCommand extends Command
     }
 
     /**
-     * @param array<string> $requirements
+     * Suggestion values for "prefer-install" option
+     */
+    protected function completePreferInstall(CompletionInput $input, CompletionSuggestions $suggestions): bool
+    {
+        if ($input->mustSuggestOptionValuesFor('prefer-install')) {
+            $suggestions->suggestValues(['dist', 'source', 'auto']);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Suggest package names from installed ones.
+     */
+    protected function completeInstalledPackage(CompletionInput $input, CompletionSuggestions $suggestions): bool
+    {
+        if (!$input->mustSuggestArgumentValuesFor('packages') &&
+            !$input->mustSuggestArgumentValuesFor('package') &&
+            !$input->mustSuggestOptionValuesFor('ignore')
+        ) {
+            return false;
+        }
+
+        $composer = $this->getComposer();
+        $installedRepos = [new RootPackageRepository(clone $composer->getPackage())];
+
+        $locker = $composer->getLocker();
+        if ($locker->isLocked()) {
+            $installedRepos[] = $locker->getLockedRepository(true);
+        } else {
+            $installedRepos[] = $composer->getRepositoryManager()->getLocalRepository();
+        }
+
+        $installedRepo = new InstalledRepository($installedRepos);
+        $suggestions->suggestValues(array_map(function (PackageInterface $package) {
+            return $package->getName();
+        }, $installedRepo->getPackages()));
+
+        return true;
+    }
+
+    /**
+     * Suggest package names available on all configured repositories.
+     */
+    protected function completeAvailablePackage(CompletionInput $input, CompletionSuggestions $suggestions): bool
+    {
+        if (!$input->mustSuggestArgumentValuesFor('packages') &&
+            !$input->mustSuggestArgumentValuesFor('package') &&
+            !$input->mustSuggestOptionValuesFor('require') &&
+            !$input->mustSuggestOptionValuesFor('require-dev')
+        ) {
+            return false;
+        }
+
+        $composer = $this->getComposer();
+        $repos = new CompositeRepository($composer->getRepositoryManager()->getRepositories());
+
+        $packages = $repos->search('^'.preg_quote($input->getCompletionValue()), RepositoryInterface::SEARCH_NAME);
+
+        foreach (array_slice($packages, 0, 150) as $package) {
+            $suggestions->suggestValue($package['name']);
+        }
+
+        return true;
+    }
+
+    /**
+     * Suggests ext- packages from the ones available on the currently-running PHP
+     */
+    protected function completePlatformPackage(CompletionInput $input, CompletionSuggestions $suggestions): bool
+    {
+        if (!$input->mustSuggestOptionValuesFor('require') &&
+            !$input->mustSuggestOptionValuesFor('require-dev') &&
+            !str_starts_with($input->getCompletionValue(), 'ext-')
+        ) {
+            return false;
+        }
+
+        $repos = new PlatformRepository([], $this->getComposer()->getConfig()->get('platform') ?? []);
+        $suggestions->suggestValues(array_map(function (PackageInterface $package) {
+            return $package->getName();
+        }, $repos->getPackages()));
+
+        return true;
+    }
+
+    /**
+     * @param array<string, string> $requirements
      *
      * @return array<string, string>
      */

src/Composer/Command/CreateProjectCommand.php

@@ -33,6 +33,8 @@ use Composer\Repository\InstalledArrayRepository;
 use Composer\Repository\RepositorySet;
 use Composer\Script\ScriptEvents;
 use Composer\Util\Silencer;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -55,6 +57,11 @@ use Composer\Package\Version\VersionParser;
  */
 class CreateProjectCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeAvailablePackage($input, $suggestions) || $this->completePreferInstall($input, $suggestions);
+    }
+
     /**
      * @var SuggestedPackagesReporter
      */

src/Composer/Command/DependsCommand.php

@@ -12,6 +12,8 @@
 
 namespace Composer\Command;
 
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Input\InputArgument;
@@ -22,6 +24,11 @@ use Symfony\Component\Console\Input\InputOption;
  */
 class DependsCommand extends BaseDependencyCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeInstalledPackage($input, $suggestions);
+    }
+
     /**
      * Configure command metadata.
      *

src/Composer/Command/ExecCommand.php

@@ -12,6 +12,8 @@
 
 namespace Composer\Command;
 
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -22,6 +24,13 @@ use Symfony\Component\Console\Input\InputArgument;
  */
 class ExecCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        if ($input->mustSuggestArgumentValuesFor('binary')) {
+            $suggestions->suggestValues($this->getBinaries(false));
+        }
+    }
+
     /**
      * @return void
      */
@@ -52,14 +61,11 @@ EOT
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         $composer = $this->requireComposer();
+        if ($input->getOption('list') || !$input->getArgument('binary')) {
+            $bins = $this->getBinaries(true);
+            if (count($bins) > 0) {
                 $binDir = $composer->getConfig()->get('bin-dir');
-        if ($input->getOption('list') || null === $input->getArgument('binary')) {
-            $bins = glob($binDir . '/*');
-            $bins = array_merge($bins, array_map(function ($e) {
-                return "$e (local)";
-            }, $composer->getPackage()->getBinaries()));
 
-            if (!$bins) {
                 throw new \RuntimeException("No binaries found in composer.json or in bin-dir ($binDir)");
             }
 
@@ -70,13 +76,6 @@ EOT
             );
 
             foreach ($bins as $bin) {
-                // skip .bat copies
-                if (isset($previousBin) && $bin === $previousBin.'.bat') {
-                    continue;
-                }
-
-                $previousBin = $bin;
-                $bin = basename($bin);
                 $this->getIO()->write(
                     <<<EOT
 <info>- $bin</info>
@@ -105,4 +104,30 @@ EOT
 
         return $dispatcher->dispatchScript('__exec_command', true, $input->getArgument('args'));
     }
+
+    private function getBinaries(bool $forDisplay): array
+    {
+        $composer = $this->getComposer();
+        $binDir = $composer->getConfig()->get('bin-dir');
+        $bins = glob($binDir . '/*');
+        $localBins = $composer->getPackage()->getBinaries();
+        if ($forDisplay) {
+            $localBins = array_map(function ($e) {
+                return "$e (local)";
+            }, $localBins);
+        }
+
+        $binaries = [];
+        foreach (array_merge($bins, $localBins) as $bin) {
+            // skip .bat copies
+            if (isset($previousBin) && $bin === $previousBin.'.bat') {
+                continue;
+            }
+
+            $previousBin = $bin;
+            $binaries[] = basename($bin);
+        }
+
+        return $binaries;
+    }
 }

src/Composer/Command/GlobalCommand.php

@@ -16,6 +16,9 @@ use Composer\Factory;
 use Composer\Pcre\Preg;
 use Composer\Util\Filesystem;
 use Composer\Util\Platform;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\StringInput;
@@ -26,6 +29,16 @@ use Symfony\Component\Console\Output\OutputInterface;
  */
 class GlobalCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $application = $this->getApplication();
+        if ($input->mustSuggestArgumentValuesFor('command-name')) {
+            $suggestions->suggestValues(array_filter(array_map(function (Command $command) {
+                return $command->isHidden() ? null : $command->getName();
+            }, $application->all())));
+        }
+    }
+
     /**
      * @return void
      */

src/Composer/Command/HomeCommand.php

@@ -18,6 +18,8 @@ use Composer\Repository\RootPackageRepository;
 use Composer\Repository\RepositoryFactory;
 use Composer\Util\Platform;
 use Composer\Util\ProcessExecutor;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputInterface;
@@ -28,6 +30,11 @@ use Symfony\Component\Console\Output\OutputInterface;
  */
 class HomeCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeInstalledPackage($input, $suggestions);
+    }
+
     /**
      * @inheritDoc
      *

src/Composer/Command/InitCommand.php

@@ -23,6 +23,8 @@ use Composer\Repository\PlatformRepository;
 use Composer\Repository\RepositoryFactory;
 use Composer\Util\Filesystem;
 use Composer\Util\Silencer;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -42,6 +44,14 @@ class InitCommand extends BaseCommand
     /** @var array<string, string> */
     private $gitConfig;
 
+    /** @var RepositorySet[] */
+    private $repositorySets;
+
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeAvailablePackage($input, $suggestions);
+    }
+
     /**
      * @inheritDoc
      *

src/Composer/Command/InstallCommand.php

@@ -16,6 +16,8 @@ use Composer\Installer;
 use Composer\Plugin\CommandEvent;
 use Composer\Plugin\PluginEvents;
 use Composer\Util\HttpDownloader;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputArgument;
@@ -29,6 +31,11 @@ use Symfony\Component\Console\Output\OutputInterface;
  */
 class InstallCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completePreferInstall($input, $suggestions) || $this->completeInstalledPackage($input, $suggestions);
+    }
+
     /**
      * @return void
      */

src/Composer/Command/OutdatedCommand.php

@@ -12,6 +12,8 @@
 
 namespace Composer\Command;
 
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\ArrayInput;
@@ -23,6 +25,11 @@ use Symfony\Component\Console\Output\OutputInterface;
  */
 class OutdatedCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeInstalledPackage($input, $suggestions);
+    }
+
     /**
      * @return void
      */

src/Composer/Command/ProhibitsCommand.php

@@ -12,6 +12,8 @@
 
 namespace Composer\Command;
 
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Input\InputArgument;
@@ -22,6 +24,11 @@ use Symfony\Component\Console\Input\InputOption;
  */
 class ProhibitsCommand extends BaseDependencyCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeAvailablePackage($input, $suggestions);
+    }
+
     /**
      * Configure command metadata.
      *

src/Composer/Command/ReinstallCommand.php

@@ -22,6 +22,8 @@ use Composer\Plugin\CommandEvent;
 use Composer\Plugin\PluginEvents;
 use Composer\Script\ScriptEvents;
 use Composer\Util\Platform;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputArgument;
@@ -32,6 +34,11 @@ use Symfony\Component\Console\Output\OutputInterface;
  */
 class ReinstallCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeInstalledPackage($input, $suggestions) || $this->completePreferInstall($input, $suggestions);
+    }
+
     /**
      * @return void
      */

src/Composer/Command/RemoveCommand.php

@@ -20,6 +20,8 @@ use Composer\Plugin\CommandEvent;
 use Composer\Plugin\PluginEvents;
 use Composer\Json\JsonFile;
 use Composer\Factory;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputArgument;
@@ -32,6 +34,11 @@ use Composer\Package\BasePackage;
  */
 class RemoveCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeInstalledPackage($input, $suggestions);
+    }
+
     /**
      * @return void
      */

src/Composer/Command/RequireCommand.php

@@ -14,6 +14,8 @@ namespace Composer\Command;
 
 use Composer\DependencyResolver\Request;
 use Composer\Util\Filesystem;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputOption;
@@ -58,6 +60,11 @@ class RequireCommand extends BaseCommand
     /** @var bool */
     private $dependencyResolutionCompleted = false;
 
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completePlatformPackage($input, $suggestions) || $this->completeAvailablePackage($input, $suggestions) || $this->completePreferInstall($input, $suggestions);
+    }
+
     /**
      * @return void
      */

src/Composer/Command/RunScriptCommand.php

@@ -16,6 +16,8 @@ use Composer\Script\Event as ScriptEvent;
 use Composer\Script\ScriptEvents;
 use Composer\Util\ProcessExecutor;
 use Composer\Util\Platform;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\InputArgument;
@@ -44,6 +46,13 @@ class RunScriptCommand extends BaseCommand
         ScriptEvents::POST_AUTOLOAD_DUMP,
     );
 
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        if ($input->mustSuggestArgumentValuesFor('script')) {
+            $suggestions->suggestValues(array_keys($this->getComposer()->getPackage()->getScripts()));
+        }
+    }
+
     /**
      * @return void
      */

src/Composer/Command/SearchCommand.php

@@ -14,6 +14,8 @@ namespace Composer\Command;
 
 use Composer\Factory;
 use Composer\Json\JsonFile;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputArgument;
@@ -30,6 +32,13 @@ use Composer\Plugin\PluginEvents;
  */
 class SearchCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        if ($input->mustSuggestOptionValuesFor('format')) {
+            $suggestions->suggestValues(['json', 'text']);
+        }
+    }
+
     /**
      * @return void
      */

src/Composer/Command/ShowCommand.php

@@ -20,7 +20,6 @@ use Composer\Package\BasePackage;
 use Composer\Package\CompletePackageInterface;
 use Composer\Package\Link;
 use Composer\Package\AliasPackage;
-use Composer\Package\Package;
 use Composer\Package\PackageInterface;
 use Composer\Package\Version\VersionParser;
 use Composer\Package\Version\VersionSelector;
@@ -41,6 +40,8 @@ use Composer\Semver\Constraint\ConstraintInterface;
 use Composer\Semver\Semver;
 use Composer\Spdx\SpdxLicenses;
 use Composer\Util\PackageInfo;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Formatter\OutputFormatterStyle;
 use Symfony\Component\Console\Input\InputArgument;
@@ -64,6 +65,17 @@ class ShowCommand extends BaseCommand
     /** @var ?RepositorySet */
     private $repositorySet;
 
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        if ($this->completeInstalledPackage($input, $suggestions)) {
+            return;
+        }
+
+        if ($input->mustSuggestOptionValuesFor('format')) {
+            $suggestions->suggestValues(['json', 'text']);
+        }
+    }
+
     /**
      * @return void
      */

src/Composer/Command/SuggestsCommand.php

@@ -16,6 +16,8 @@ use Composer\Repository\PlatformRepository;
 use Composer\Repository\RootPackageRepository;
 use Composer\Repository\InstalledRepository;
 use Composer\Installer\SuggestedPackagesReporter;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -23,6 +25,11 @@ use Symfony\Component\Console\Output\OutputInterface;
 
 class SuggestsCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeInstalledPackage($input, $suggestions);
+    }
+
     /**
      * @return void
      */

src/Composer/Command/UpdateCommand.php

@@ -24,6 +24,8 @@ use Composer\Package\Version\VersionParser;
 use Composer\Util\HttpDownloader;
 use Composer\Semver\Constraint\MultiConstraint;
 use Composer\Package\Link;
+use Symfony\Component\Console\Completion\CompletionInput;
+use Symfony\Component\Console\Completion\CompletionSuggestions;
 use Symfony\Component\Console\Helper\Table;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -37,6 +39,11 @@ use Symfony\Component\Console\Question\Question;
  */
 class UpdateCommand extends BaseCommand
 {
+    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
+    {
+        $this->completeInstalledPackage($input, $suggestions) || $this->completePreferInstall($input, $suggestions);
+    }
+
     /**
      * @return void
      */

src/Composer/Package/Version/VersionGuesser.php

@@ -74,6 +74,12 @@ class VersionGuesser
             return null;
         }
 
+        // bypass version guessing in bash completions as it takes time to create
+        // new processes and the root version is usually not that important
+        if (isset($_SERVER['argv'][1]) && $_SERVER['argv'][1] === '_complete') {
+            return null;
+        }
+
         $versionData = $this->guessGitVersion($packageConfig, $path);
         if (null !== $versionData && null !== $versionData['version']) {
             return $this->postprocess($versionData);

src/Composer/Util/HttpDownloader.php

@@ -44,8 +44,12 @@ class HttpDownloader
     private $config;
     /** @var array<Job> */
     private $jobs = array();
+    /** @var bool */
+    private $disableTls;
     /** @var mixed[] */
     private $options = array();
+    /** @var mixed[]|null */
+    private $tlsDefaultOptions = null;
     /** @var int */
     private $runningJobs = 0;
     /** @var int */
@@ -73,22 +77,19 @@ class HttpDownloader
 
         $this->disabled = (bool) Platform::getEnv('COMPOSER_DISABLE_NETWORK');
 
-        // Setup TLS options
-        // The cafile option can be set via config.json
-        if ($disableTls === false) {
-            $this->options = StreamContextFactory::getTlsDefaults($options, $io);
+        if ($disableTls === true) {
+            // make sure the tlsDefaultOptions are not loaded later
+            $this->tlsDefaultOptions = [];
         }
 
-        // handle the other externally set options normally.
-        $this->options = array_replace_recursive($this->options, $options);
+        $this->disableTls = $disableTls;
+        $this->options = $options;
         $this->config = $config;
 
         if (self::isCurlEnabled()) {
             $this->curl = new CurlDownloader($io, $config, $options, $disableTls);
         }
 
-        $this->rfs = new RemoteFilesystem($io, $config, $options, $disableTls);
-
         if (is_numeric($maxJobs = Platform::getEnv('COMPOSER_MAX_PARALLEL_HTTP'))) {
             $this->maxJobs = max(1, min(50, (int) $maxJobs));
         }
@@ -171,7 +172,13 @@ class HttpDownloader
      */
     public function getOptions()
     {
-        return $this->options;
+        if ($this->tlsDefaultOptions === null) {
+            // Setup TLS options
+            // The cafile option can be set via config.json
+            $this->tlsDefaultOptions = StreamContextFactory::getTlsDefaults($this->options, $this->io);
+        }
+
+        return array_replace_recursive($this->tlsDefaultOptions, $this->options);
     }
 
     /**
@@ -191,7 +198,7 @@ class HttpDownloader
      */
     private function addJob(array $request, bool $sync = false): array
     {
-        $request['options'] = array_replace_recursive($this->options, $request['options']);
+        $request['options'] = array_replace_recursive($this->getOptions(), $request['options']);
 
         /** @var Job */
         $job = array(
@@ -211,8 +218,6 @@ class HttpDownloader
             $this->io->setAuthentication($job['origin'], rawurldecode($match[1]), rawurldecode($match[2]));
         }
 
-        $rfs = $this->rfs;
-
         if ($this->canUseCurl($job)) {
             $resolver = function ($resolve, $reject) use (&$job): void {
                 $job['status'] = HttpDownloader::STATUS_QUEUED;
@@ -285,6 +290,15 @@ class HttpDownloader
         return array($job, $promise);
     }
 
+    private function getRFS(): RemoteFilesystem
+    {
+        if (null === $this->rfs) {
+            $this->rfs = new RemoteFilesystem($this->io, $this->config, $this->options, $this->disableTls);
+        }
+
+        return $this->rfs;
+    }
+
     /**
      * @param  int  $id
      * @return void

tests/Composer/Test/CompletionFunctionalTest.php

@@ -0,0 +1,109 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Test;
+
+use Composer\Console\Application;
+use Symfony\Component\Console\Tester\CommandCompletionTester;
+
+/**
+ * Validate autocompletion for all commands.
+ *
+ * @author Jérôme Tamarelle <jerome@tamarelle.net>
+ */
+class CompletionFunctionalTest extends TestCase
+{
+    public function getCommandSuggestions(): iterable
+    {
+        $randomProject = '104corp/cache';
+        $installedPackages = ['composer/semver', 'psr/log'];
+        $preferInstall = ['dist', 'source', 'auto'];
+
+        yield ['archive ', [$randomProject]];
+        yield ['archive symfony/http-', ['symfony/http-kernel', 'symfony/http-foundation']];
+        yield ['archive --format ', ['tar', 'zip']];
+
+        yield ['create-project ', [$randomProject]];
+        yield ['create-project symfony/skeleton --prefer-install ', $preferInstall];
+
+        yield ['depends ', $installedPackages];
+        yield ['why ', $installedPackages];
+
+        yield ['exec ', ['composer', 'compile']];
+
+        yield ['browse ', $installedPackages];
+        yield ['home -H ', $installedPackages];
+
+        yield ['init --require ', [$randomProject]];
+        yield ['init --require-dev foo/bar --require-dev ', [$randomProject]];
+
+        yield ['install --prefer-install ', $preferInstall];
+        yield ['install ', $installedPackages];
+
+        yield ['outdated ', $installedPackages];
+
+        yield ['prohibits ', [$randomProject]];
+        yield ['why-not symfony/http-ker', ['symfony/http-kernel']];
+
+        yield ['reinstall --prefer-install ', $preferInstall];
+        yield ['reinstall ', $installedPackages];
+
+        yield ['remove ', $installedPackages];
+
+        yield ['require --prefer-install ', $preferInstall];
+        yield ['require ', [$randomProject]];
+        yield ['require --dev symfony/http-', ['symfony/http-kernel', 'symfony/http-foundation']];
+
+        yield ['run-script ', ['compile', 'test', 'phpstan']];
+        yield ['run-script test ', null];
+
+        yield ['search --format ', ['text', 'json']];
+
+        yield ['show --format ', ['text', 'json']];
+        yield ['info ', $installedPackages];
+
+        yield ['suggests ', $installedPackages];
+
+        yield ['update --prefer-install ', $preferInstall];
+        yield ['update ', $installedPackages];
+    }
+
+    /**
+     * @dataProvider getCommandSuggestions
+     *
+     * @param string $input The command that is typed
+     * @param string[]|null $expectedSuggestions Sample expected suggestions. Null if nothing is expected.
+     */
+    public function testComplete(string $input, ?array $expectedSuggestions): void
+    {
+        $input = explode(' ', $input);
+        $commandName = array_shift($input);
+        $command = $this->getApplication()->get($commandName);
+
+        $tester = new CommandCompletionTester($command);
+        $suggestions = $tester->complete($input);
+
+        if (null === $expectedSuggestions) {
+            $this->assertEmpty($suggestions);
+
+            return;
+        }
+
+        $diff = array_diff($expectedSuggestions, $suggestions);
+        $this->assertEmpty($diff, sprintf('Suggestions must contain "%s". Got "%s".', implode('", "', $diff), implode('", "', $suggestions)));
+    }
+
+    private function getApplication(): Application
+    {
+        return new Application();
+    }
+}