Set permissions on log file creation instead of every write.

lib/private/Log/Owncloud.php

@@ -51,14 +51,8 @@ public static function init() {
 		 * Fall back to default log file if specified logfile does not exist
 		 * and can not be created.
 		 */
-		if (!\file_exists(self::$logFile)) {
-			if (!\is_writable(\dirname(self::$logFile))) {
-				self::$logFile = $defaultLogFile;
-			} else {
-				if (!\touch(self::$logFile)) {
-					self::$logFile = $defaultLogFile;
-				}
-			}
+		if (!self::createLogFile(self::$logFile)) {
+			self::$logFile = $defaultLogFile;
 		}
 	}
 
@@ -125,11 +119,11 @@ public static function writeExtra($app, $message, $level, $conditionalLogFile, $
 			if ($conditionalLogFile[0] !== '/') {
 				$conditionalLogFile = \OC::$server->getConfig()->getSystemValue('datadirectory') . "/" . $conditionalLogFile;
 			}
+			self::createLogFile($conditionalLogFile);
 			$handle = @\fopen($conditionalLogFile, 'a');
-			@\chmod($conditionalLogFile, 0640);
 		} else {
+			self::createLogFile(self::$logFile);
 			$handle = @\fopen(self::$logFile, 'a');
-			@\chmod(self::$logFile, 0640);
 		}
 		if ($handle) {
 			\fwrite($handle, $entry."\n");
@@ -143,6 +137,23 @@ public static function writeExtra($app, $message, $level, $conditionalLogFile, $
 		}
 	}
 
+	/**
+	 * create a log file and chmod it to the correct permissions
+	 * @param string $logFile
+	 * @return boolean
+	 */
+	public static function createLogFile($logFile) {
+		if (\file_exists($logFile) ) {
+			return true;
+		} else {
+			if (\is_writable(\dirname($logFile)) && \touch($logFile)) {
+				@\chmod($logFile, 0640);
+				return true;
+			}
+		}
+		return false;
+	}
+
 	/**
 	 * @return string
 	 */