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

<?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;
    }
}