Per user persistent storage

src/Host/Storage.php

@@ -14,6 +14,73 @@
 
 class Storage
 {
+	/**
+	 * In a multi user environment where multiple projects are located on the same instance(s)
+	 *	if two or more users are deploying at the same time on the same environment, 
+	 *	the generated hosts files are overwritten or worse, the deploy will fail 
+	 *	due to file permissions
+	 *
+	 * Make the persistent storage folder configurable or use the system tmp 
+	 *	as default if not possible
+	 * 
+	 * @return string
+	 * @throws Exception
+	 */
+	private static function _getPersistentStorageLocation() {
+		$config = \Deployer\Deployer::get()->config;
+
+		// use the system temporary folder and the current pid as default 
+		// persistent storage in case we can't use the configured value
+		// or we can't create the default location
+		$tmp = sys_get_temp_dir() . '/' . posix_getpid();
+
+		// get the location for the deployer configuration
+		$deployerConfig = $config->has('deployer_config') ? $config->get('deployer_config') : null;
+
+		if ( !is_null($deployerConfig) ) {
+			// check if the folder exists and it's writable
+			if ( !(is_dir($deployerConfig) && is_writable($deployerConfig)) ) {
+				throw new Exception("Deployer folder `$deployerConfig` doesn't exists or doesn't writable.");
+			}
+		} else {
+			// not configured, generate deployer folder name
+
+			// use the home dir of the current user 
+			// and the repository name
+			$userInfo = posix_getpwuid(posix_getuid());
+
+			// if for some reason we couldn't find a valid home folder
+			// or if it's not writable, use the default location
+			if ( !isset($userInfo['dir']) || !(is_dir($userInfo['dir']) && is_writable($userInfo['dir'])) ) {
+				return $tmp;
+			}
+
+			// we have a folder name
+			$deployerConfig = $userInfo['dir'] . '/.deployer';
+
+			//if it doesn't exists, create it
+			if ( !file_exists($deployerConfig) ) {
+				mkdir($deployerConfig, 0777, true);
+			} 
+
+			//it exists, check if it's a folder and if it's writable
+			if ( !(is_dir($deployerConfig) && is_writable($deployerConfig)) ) {
+				return $tmp;
+			}
+		}
+
+		// we will store the persistent data per repository
+		$configRepository = $config->has('repository') ? $config->get('repository') : null;
+		if (empty($configRepository)) {
+			return $tmp;
+		} 
+
+		// we now have the repository name
+		$repository = str_replace('/', '_', substr($configRepository, (strrpos($configRepository, ':') + 1)));
+
+		return $deployerConfig . '/' . $repository;
+	}
+
     /**
      * @param Host[] $hosts
      */
@@ -27,7 +94,7 @@ public static function persist(array $hosts)
                 $values[$key] = $host->get($key);
             }
 
-            $file = sys_get_temp_dir() . '/' . $host->getHostname() . '.dep';
+            $file = self::_getPersistentStorageLocation() . '/' . $host->getHostname() . '.dep';
             $values['host_config_storage'] = $file;
 
             $persistentCollection = new PersistentCollection($file, $values);