The git remote cache deployment task.

This tasks uses a remote checkout on the server to provide the release.
In our use case this remote cache resides in $to/$shared/git-remote-cache,
variable 'shared' is substituted with "shared" by default. At this time, the
remote cache is not build automatically, you need to provide a clean
checkout before you can start using it.

Mage/Command/BuiltIn/DeployCommand.php

@@ -311,6 +311,10 @@ class DeployCommand extends AbstractCommand implements RequiresEnvironment
                         $deployStrategy = 'deployment/strategy/tar-gz';
                         break;
 
+                    case 'remote-cache':
+                        $deployStrategy = 'deployment/strategy/git-remote-cache';
+                        break;
+
                     case 'guess':
                     default:
                         if ($this->getConfig()->release('enabled', false) == true) {

Mage/Task/BuiltIn/Deployment/Strategy/GitRemoteCacheTask.php

@@ -0,0 +1,137 @@
+<?php
+namespace Mage\Task\BuiltIn\Deployment\Strategy;
+
+use Exception;
+use Mage\Task\AbstractTask;
+use Mage\Task\ErrorWithMessageException;
+use Mage\Task\Releases\IsReleaseAware;
+use Mage\Task\SkipException;
+
+/**
+ * The git remote cache deployment task.
+ *
+ * This tasks uses a remote checkout on the server to provide the release.
+ * In our use case this remote cache resides in $to/$shared/git-remote-cache,
+ * $shared is substituted with "shared" by default. At this time, the remote cache
+ * is not build automatically, you need to provide a clean checkout before you can
+ * start using it.
+ *
+ * @package Mage\Task\BuiltIn\Deployment\Strategy
+ * @author Mario Mueller <mueller@freshcells.de>
+ */
+class GitRemoteCacheTask extends AbstractTask implements IsReleaseAware
+{
+    /**
+     * Returns the Title of the Task
+     * @return string
+     */
+    public function getName()
+    {
+        return 'Deploy via remote cached git repository [built-in]';
+    }
+
+    /**
+     * Runs the task
+     *
+     * @return boolean
+     * @throws Exception
+     * @throws ErrorWithMessageException
+     * @throws SkipException
+     */
+    public function run()
+    {
+        $overrideRelease = $this->getParameter('overrideRelease', false);
+
+        if ($overrideRelease == true) {
+            $releaseToOverride = false;
+            $resultFetch = $this->runCommandRemote('ls -ld current | cut -d"/" -f2', $releaseToOverride);
+            if ($resultFetch && is_numeric($releaseToOverride)) {
+                $this->getConfig()->setReleaseId($releaseToOverride);
+            }
+        }
+
+        $excludes = array(
+            '.git',
+            '.svn',
+            '.mage',
+            '.gitignore',
+            '.gitkeep',
+            'nohup.out'
+        );
+
+        // Look for User Excludes
+        $userExcludes = $this->getConfig()->deployment('excludes', array());
+
+        $deployToDirectory = $this->getConfig()->deployment('to');
+        if ($this->getConfig()->release('enabled', false) == true) {
+            $releasesDirectory = $this->getConfig()->release('directory', 'releases');
+
+            $deployToDirectory = rtrim($this->getConfig()->deployment('to'), '/')
+                . '/' . $releasesDirectory
+                . '/' . $this->getConfig()->getReleaseId();
+            $this->runCommandRemote('mkdir -p ' . $releasesDirectory . '/' . $this->getConfig()->getReleaseId());
+        }
+
+        $branch = $this->getParameter('branch');
+        $remote = $this->getParameter('remote', 'origin');
+
+        $remoteCacheParam = $this->getParameter('remote_cache', 'shared/git-remote-cache');
+        $remoteCacheFolder = rtrim($this->getConfig()->deployment('to'), '/') . '/' . $remoteCacheParam;
+
+        // Don't use -C as git 1.7 does not support it
+        $command = 'cd ' . $remoteCacheFolder . ' && /usr/bin/env git fetch ' . $remote;
+        $result = $this->runCommandRemote($command);
+
+        $command = 'cd ' . $remoteCacheFolder . ' && /usr/bin/env git checkout ' . $branch;
+        $result = $this->runCommandRemote($command) && $result;
+
+        $command = 'cd ' . $remoteCacheFolder . ' && /usr/bin/env git pull --rebase ' . $branch;
+        $result = $this->runCommandRemote($command) && $result;
+
+        $excludes = array_merge($excludes, $userExcludes);
+        $excludeCmd = '';
+        foreach ($excludes as $excludeFile) {
+            $excludeCmd .= ' --exclude=' . $excludeFile;
+        }
+
+        $command = 'cd ' . $remoteCacheFolder . ' && /usr/bin/env git archive ' . $branch . ' | tar -x -C ' . $deployToDirectory . ' ' . $excludeCmd;
+        $result = $this->runCommandRemote($command) && $result;
+
+        // Count Releases
+        if ($this->getConfig()->release('enabled', false) == true) {
+            $releasesDirectory = $this->getConfig()->release('directory', 'releases');
+            $symlink = $this->getConfig()->release('symlink', 'current');
+
+            if (substr($symlink, 0, 1) == '/') {
+                $releasesDirectory = rtrim($this->getConfig()->deployment('to'), '/') . '/' . $releasesDirectory;
+            }
+
+            $maxReleases = $this->getConfig()->release('max', false);
+            if (($maxReleases !== false) && ($maxReleases > 0)) {
+                $releasesList = '';
+                $countReleasesFetch = $this->runCommandRemote('ls -1 ' . $releasesDirectory, $releasesList);
+                $releasesList = trim($releasesList);
+
+                if ($countReleasesFetch && $releasesList != '') {
+                    $releasesList = explode(PHP_EOL, $releasesList);
+                    if (count($releasesList) > $maxReleases) {
+                        $releasesToDelete = array_diff($releasesList, array($this->getConfig()->getReleaseId()));
+                        sort($releasesToDelete);
+                        $releasesToDeleteCount = count($releasesToDelete) - $maxReleases;
+                        $releasesToDelete = array_slice($releasesToDelete, 0, $releasesToDeleteCount + 1);
+
+                        foreach ($releasesToDelete as $releaseIdToDelete) {
+                            $directoryToDelete = $releasesDirectory . '/' . $releaseIdToDelete;
+                            if ($directoryToDelete != '/') {
+                                $command = 'rm -rf ' . $directoryToDelete;
+                                $result = $result && $this->runCommandRemote($command);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        return $result;
+    }
+}