Fix VCS drivers to always use identifiers and not tag names since those can change or disappear

src/Composer/Repository/Vcs/GitBitbucketDriver.php

@@ -65,9 +65,7 @@ class GitBitbucketDriver extends VcsDriver implements VcsDriverInterface
      */
     public function getSource($identifier)
     {
-        $label = array_search($identifier, $this->getTags()) ?: $identifier;
-
-        return array('type' => 'git', 'url' => $this->getUrl(), 'reference' => $label);
+        return array('type' => 'git', 'url' => $this->getUrl(), 'reference' => $identifier);
     }
 
     /**
@@ -75,10 +73,9 @@ class GitBitbucketDriver extends VcsDriver implements VcsDriverInterface
      */
     public function getDist($identifier)
     {
-        $label = array_search($identifier, $this->getTags()) ?: $identifier;
-        $url = $this->getScheme() . '://bitbucket.org/'.$this->owner.'/'.$this->repository.'/get/'.$label.'.zip';
+        $url = $this->getScheme() . '://bitbucket.org/'.$this->owner.'/'.$this->repository.'/get/'.$identifier.'.zip';
 
-        return array('type' => 'zip', 'url' => $url, 'reference' => $label, 'shasum' => '');
+        return array('type' => 'zip', 'url' => $url, 'reference' => $identifier, 'shasum' => '');
     }
 
     /**

src/Composer/Repository/Vcs/GitHubDriver.php

@@ -87,7 +87,6 @@ class GitHubDriver extends VcsDriver
         if ($this->gitDriver) {
             return $this->gitDriver->getSource($identifier);
         }
-        $label = array_search($identifier, $this->getTags()) ?: $identifier;
         if ($this->isPrivate) {
             // Private GitHub repositories should be accessed using the
             // SSH version of the URL.
@@ -96,7 +95,7 @@ class GitHubDriver extends VcsDriver
             $url = $this->getUrl();
         }
 
-        return array('type' => 'git', 'url' => $url, 'reference' => $label);
+        return array('type' => 'git', 'url' => $url, 'reference' => $identifier);
     }
 
     /**
@@ -107,10 +106,9 @@ class GitHubDriver extends VcsDriver
         if ($this->gitDriver) {
             return $this->gitDriver->getDist($identifier);
         }
-        $label = array_search($identifier, $this->getTags()) ?: $identifier;
-        $url = 'https://api.github.com/repos/'.$this->owner.'/'.$this->repository.'/zipball/'.$label;
+        $url = 'https://api.github.com/repos/'.$this->owner.'/'.$this->repository.'/zipball/'.$identifier;
 
-        return array('type' => 'zip', 'url' => $url, 'reference' => $label, 'shasum' => '');
+        return array('type' => 'zip', 'url' => $url, 'reference' => $identifier, 'shasum' => '');
     }
 
     /**

src/Composer/Repository/Vcs/HgBitbucketDriver.php

@@ -68,9 +68,7 @@ class HgBitbucketDriver extends VcsDriver
      */
     public function getSource($identifier)
     {
-        $label = array_search($identifier, $this->getTags()) ?: $identifier;
-
-        return array('type' => 'hg', 'url' => $this->getUrl(), 'reference' => $label);
+        return array('type' => 'hg', 'url' => $this->getUrl(), 'reference' => $identifier);
     }
 
     /**
@@ -78,10 +76,9 @@ class HgBitbucketDriver extends VcsDriver
      */
     public function getDist($identifier)
     {
-        $label = array_search($identifier, $this->getTags()) ?: $identifier;
-        $url = $this->getScheme() . '://bitbucket.org/'.$this->owner.'/'.$this->repository.'/get/'.$label.'.zip';
+        $url = $this->getScheme() . '://bitbucket.org/'.$this->owner.'/'.$this->repository.'/get/'.$identifier.'.zip';
 
-        return array('type' => 'zip', 'url' => $url, 'reference' => $label, 'shasum' => '');
+        return array('type' => 'zip', 'url' => $url, 'reference' => $identifier, 'shasum' => '');
     }
 
     /**

src/Composer/Repository/Vcs/HgDriver.php

@@ -98,9 +98,7 @@ class HgDriver extends VcsDriver
      */
     public function getSource($identifier)
     {
-        $label = array_search($identifier, (array) $this->tags) ? : $identifier;
-
-        return array('type' => 'hg', 'url' => $this->getUrl(), 'reference' => $label);
+        return array('type' => 'hg', 'url' => $this->getUrl(), 'reference' => $identifier);
     }
 
     /**