Adding ssh protocol support to github-protocols.

src/Composer/Command/ConfigCommand.php

@@ -294,8 +294,8 @@ EOT
                     }
 
                     foreach ($vals as $val) {
-                        if (!in_array($val, array('git', 'https'))) {
-                            return 'valid protocols include: git, https';
+                        if (!in_array($val, array('git', 'https', 'ssh'))) {
+                            return 'valid protocols include: git, https, ssh';
                         }
                     }
 

src/Composer/Config.php

@@ -24,7 +24,7 @@ class Config
         'use-include-path' => false,
         'preferred-install' => 'auto',
         'notify-on-install' => true,
-        'github-protocols' => array('git', 'https'),
+        'github-protocols' => array('git', 'https', 'ssh'),
         'vendor-dir' => 'vendor',
         'bin-dir' => '{$vendor-dir}/bin',
         'cache-dir' => '{$home}/cache',
@@ -206,7 +206,7 @@ class Config
 
             case 'github-protocols':
                 if (reset($this->config['github-protocols']) === 'http') {
-                    throw new \RuntimeException('The http protocol for github is not available anymore, update your config\'s github-protocols to use "https" or "git"');
+                    throw new \RuntimeException('The http protocol for github is not available anymore, update your config\'s github-protocols to use "https" or "git" or "ssh"');
                 }
 
                 return $this->config[$key];

src/Composer/Downloader/GitDownloader.php

@@ -312,14 +312,19 @@ class GitDownloader extends VcsDownloader
         }
 
         // public github, autoswitch protocols
-        if (preg_match('{^(?:https?|git)(://'.$this->getGitHubDomainsRegex().'/.*)}', $url, $match)) {
+        if (preg_match('{^(?:https?|git)://'.$this->getGitHubDomainsRegex().'/(.*)}', $url, $match)) {
             $protocols = $this->config->get('github-protocols');
             if (!is_array($protocols)) {
                 throw new \RuntimeException('Config value "github-protocols" must be an array, got '.gettype($protocols));
             }
             $messages = array();
             foreach ($protocols as $protocol) {
-                $url = $protocol . $match[1];
+                if ('ssh' === $protocol) {
+                    $url = "git@" . $match[1] . ":" . $match[2];
+                } else {
+                    $url = $protocol ."://" . $match[1] . "/" . $match[2];
+                }
+
                 if (0 === $this->process->execute(call_user_func($commandCallable, $url), $ignoredOutput, $cwd)) {
                     return;
                 }