From 0f47c27ccf104554ddae40e4c9fad11f9479aa9a Mon Sep 17 00:00:00 2001
From: Niklas Keller <me@kelunik.com>
Date: Wed, 9 Dec 2015 21:45:28 +0100
Subject: [PATCH] Fix #6: Ignore UID / GID @ chown if -1

---
 lib/BlockingDriver.php | 16 +++++++++-------
 lib/functions.php      |  6 +++---
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/lib/BlockingDriver.php b/lib/BlockingDriver.php
index 5542c3a..202b74a 100644
--- a/lib/BlockingDriver.php
+++ b/lib/BlockingDriver.php
@@ -247,17 +247,19 @@ class BlockingDriver implements Driver {
      * {@inheritdoc}
      */
     public function chown($path, $uid, $gid) {
-        if (!@\chown($path, $uid)) {
+        if ($uid !== -1 && !@\chown($path, $uid)) {
             return new Failure(new FilesystemException(
                 \error_get_last()["message"]
             ));
-        } elseif (!@\chgrp($path, $gid)) {
-            return new Failure(new FilesystemException(
-                \error_get_last()["message"]
-            ));
-        } else {
-            return new Success;
         }
+
+        if ($gid !== -1 && !@\chgrp($path, $gid)) {
+            return new Failure(new FilesystemException(
+                \error_get_last()["message"]
+            ));
+        }
+
+        return new Success;
     }
 
     /**
diff --git a/lib/functions.php b/lib/functions.php
index 2aa8d59..543454c 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -240,11 +240,11 @@ function chmod($path, $mode) {
  * chown a file or directory
  *
  * @param string $path
- * @param int $uid
- * @param int $gid
+ * @param int $uid -1 to ignore
+ * @param int $gid -1 to ignore
  * @return \Amp\Promise<null>
  */
-function chown($path, $uid, $gid) {
+function chown($path, $uid, $gid = -1) {
     return filesystem()->chown($path, $uid, $gid);
 }