Removed code duplication with abstract hasMetadataRepository method

which checks if vcs metadata is present in the package

Fixed a bug with -vvv mode. When .git folder is missing from package
in normal mode, -v mode, -vv mode the program throws the exception about missing .git folder
in -vvv mode an exception about inability to read logs

src/Composer/Downloader/GitDownloader.php

@@ -72,9 +72,8 @@ class GitDownloader extends VcsDownloader
     public function doUpdate(PackageInterface $initial, PackageInterface $target, $path, $url)
     {
         GitUtil::cleanEnv();
-        $path = $this->normalizePath($path);
+        if (!$this->hasMetadataRepository($path)) {
-        if (!is_dir($path.'/.git')) {
+            throw new VcsMissingMetadataException('The .git directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
-            throw new \RuntimeException('The .git directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
         }
 
         $ref = $target->getSourceReference();
@@ -100,8 +99,7 @@ class GitDownloader extends VcsDownloader
     public function getLocalChanges(PackageInterface $package, $path)
     {
         GitUtil::cleanEnv();
-        $path = $this->normalizePath($path);
+        if (!$this->hasMetadataRepository($path)) {
-        if (!is_dir($path.'/.git')) {
             return;
         }
 
@@ -371,4 +369,17 @@ class GitDownloader extends VcsDownloader
 
         return $path;
     }
+
+    /**
+     * Checks if VCS metadata repository has been initialized
+     * repository example: .git|.svn|.hg
+     *
+     * @param string $path
+     * @return bool
+     */
+    protected function hasMetadataRepository($path)
+    {
+        $path = $this->normalizePath($path);
+        return is_dir($path.'/.git');
+    }
 }

src/Composer/Downloader/HgDownloader.php

@@ -47,8 +47,8 @@ class HgDownloader extends VcsDownloader
         $ref = ProcessExecutor::escape($target->getSourceReference());
         $this->io->writeError("    Updating to ".$target->getSourceReference());
 
-        if (!is_dir($path.'/.hg')) {
+        if (!$this->hasMetadataRepository($path)) {
-            throw new \RuntimeException('The .hg directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
+            throw new VcsMissingMetadataException('The .hg directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
         }
 
         $command = sprintf('hg pull %s && hg up %s', $url, $ref);
@@ -84,4 +84,16 @@ class HgDownloader extends VcsDownloader
 
         return $output;
     }
+
+    /**
+     * Checks if VCS metadata repository has been initialized
+     * repository example: .git|.svn|.hg
+     *
+     * @param string $path
+     * @return bool
+     */
+    protected function hasMetadataRepository($path)
+    {
+        return is_dir($path . '/.hg');
+    }
 }

src/Composer/Downloader/PerforceDownloader.php

@@ -104,4 +104,16 @@ class PerforceDownloader extends VcsDownloader
     {
         $this->perforce = $perforce;
     }
+
+    /**
+     * Checks if VCS metadata repository has been initialized
+     * repository example: .git|.svn|.hg
+     *
+     * @param string $path
+     * @return bool
+     */
+    protected function hasMetadataRepository($path)
+    {
+        return true;
+    }
 }

src/Composer/Downloader/SvnDownloader.php

@@ -52,8 +52,8 @@ class SvnDownloader extends VcsDownloader
         SvnUtil::cleanEnv();
         $ref = $target->getSourceReference();
 
-        if (!is_dir($path.'/.svn')) {
+        if (!$this->hasMetadataRepository($path)) {
-            throw new \RuntimeException('The .svn directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
+            throw new VcsMissingMetadataException('The .svn directory is missing from '.$path.', see https://getcomposer.org/commit-deps for more information');
         }
 
         $flags = "";
@@ -72,7 +72,7 @@ class SvnDownloader extends VcsDownloader
      */
     public function getLocalChanges(PackageInterface $package, $path)
     {
-        if (!is_dir($path.'/.svn')) {
+        if (!$this->hasMetadataRepository($path)) {
             return;
         }
 
@@ -188,4 +188,16 @@ class SvnDownloader extends VcsDownloader
             throw new \RuntimeException("Could not reset changes\n\n:".$this->process->getErrorOutput());
         }
     }
+
+    /**
+     * Checks if VCS metadata repository has been initialized
+     * repository example: .git|.svn|.hg
+     *
+     * @param string $path
+     * @return bool
+     */
+    protected function hasMetadataRepository($path)
+    {
+        return is_dir($path.'/.svn');
+    }
 }

src/Composer/Downloader/VcsDownloader.php

@@ -111,6 +111,8 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
 
         $this->cleanChanges($initial, $path, true);
         $urls = $target->getSourceUrls();
+
+        $exception = null;
         while ($url = array_shift($urls)) {
             try {
                 if (Filesystem::isLocalPath($url)) {
@@ -118,22 +120,24 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
                 }
                 $this->doUpdate($initial, $target, $path, $url);
                 break;
-            } catch (\Exception $e) {
+            } catch (\Exception $exception) {
                 if ($this->io->isDebug()) {
-                    $this->io->writeError('Failed: ['.get_class($e).'] '.$e->getMessage());
+                    $this->io->writeError('Failed: ['.get_class($exception).'] '.$exception->getMessage());
                 } elseif (count($urls)) {
                     $this->io->writeError('    Failed, trying the next URL');
-                } else {
-                    // in case of failed update, try to reapply the changes before aborting
-                    $this->reapplyChanges($path);
-
-                    throw $e;
                 }
             }
         }
 
         $this->reapplyChanges($path);
 
+        if (!$this->hasMetadataRepository($path) && !$urls && $exception) {
+            if (!$this->io->isDebug()) {
+                $this->io->write('    The VCS directory is missing from vendor package, see https://getcomposer.org/commit-deps for more information');
+            }
+            throw $exception;
+        }
+
         // print the commit logs if in verbose mode
         if ($this->io->isVerbose()) {
             $message = 'Pulling in changes:';
@@ -236,4 +240,13 @@ abstract class VcsDownloader implements DownloaderInterface, ChangeReportInterfa
      * @return string
      */
     abstract protected function getCommitLogs($fromReference, $toReference, $path);
+
+    /**
+     * Checks if VCS metadata repository has been initialized
+     * repository example: .git|.svn|.hg
+     *
+     * @param string $path
+     * @return bool
+     */
+    abstract protected function hasMetadataRepository($path);
 }

src/Composer/Downloader/VcsMissingMetadataException.php

@@ -0,0 +1,30 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: bogdans
+ * Date: 2/4/16
+ * Time: 1:16 AM
+ */
+
+namespace Composer\Downloader;
+
+/**
+ * Exception thrown when missing .git|.svn|.hg folders, which contain VSC metadata
+ *
+ * @author Bogdans Ozerkins <b.ozerkins@gmail.com>
+ */
+class VcsMissingMetadataException extends \RuntimeException
+{
+    /**
+     * Construct the exception. Note: The message is NOT binary safe.
+     * @link http://php.net/manual/en/exception.construct.php
+     * @param string $message [optional] The Exception message to throw.
+     * @param int $code [optional] The Exception code.
+     * @param \Exception $previous [optional] The previous exception used for the exception chaining. Since 5.3.0
+     * @since 5.1.0
+     */
+    public function __construct($message = '', $code = 0, \Exception $previous = null)
+    {
+        parent::__construct("Missing VSC metadata exception: \n".$message, $code, $previous);
+    }
+}