Adds a task to only have read permission for web server

Mage/Task/BuiltIn/Filesystem/PermissionsReadableOnlyByWebServerTask.php

@@ -0,0 +1,60 @@
+<?php
+namespace Mage\Task\BuiltIn\Filesystem;
+
+use Mage\Task\SkipException;
+
+/**
+ * Task for giving only to web server read permissions on given paths.
+ *
+ * Usage :
+ *   pre-deploy:
+ *     - filesystem/permissions-readable-only-by-web-server: {paths: /var/www/myapp/app/config/config.yml:/var/www/myapp/app/config/parameters.yml, recursive: false, checkPathsExist: true}
+ *     - filesystem/permissions-readable-only-by-web-server:
+ *         paths:
+ *             - /var/www/myapp/app/config/config.yml
+ *             - /var/www/myapp/app/config/parameters.yml
+ *         recursive: false
+ *         checkPathsExist: true
+ *   on-deploy:
+ *     - filesystem/permissions-readable-only-by-web-server: {paths: app/config/config.yml:app/config/parameters.yml, recursive: false, checkPathsExist: true}
+ *
+ * @author Jérémy Huet <jeremy.huet@gmail.com>
+ */
+class PermissionsReadableOnlyByWebServerTask extends PermissionsTask
+{
+    /**
+     * Set group with web server user and give group write permissions.
+     */
+    public function init()
+    {
+        parent::init();
+
+        $this->setGroup($this->getParameter('group', $this->getWebServerUser()))
+             ->setRights('040');
+    }
+
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return "Giving read permissions only to web server user for given paths [built-in]";
+    }
+
+    /**
+     * Tries to guess the web server user by going thru the running processes.
+     *
+     * @return string
+     * @throws SkipException
+     */
+    protected function getWebServerUser()
+    {
+        $this->runCommand("ps aux | grep -E '[a]pache|[h]ttpd|[_]www|[w]ww-data|[n]ginx' | grep -v root | head -1 | cut -d\  -f1", $webServerUser);
+
+        if (empty($webServerUser)) {
+            throw new SkipException("Can't guess web server user. Please check if it is running or force it by setting the group parameter");
+        }
+
+        return $webServerUser;
+    }
+}