Added separated handling of root paths

Author: jaytaph

src/Symfony/Component/Filesystem/Filesystem.php

@@ -330,8 +330,13 @@ public function makePathRelative($endPath, $startPath)
         // Determine how deep the start path is relative to the common path (ie, "web/bundles" = 2 levels)
         $depth = count($startPathArr) - $index;
 
-        // Repeated "../" for each level need to reach the common path
-        $traverser = str_repeat('../', $depth);
+        // When we need to traverse from the start, and we are starting from a root path, don't add '../'
+        if ($startPath[0] == '/' && $index == 0 && $depth == 1) {
+            $traverser = '';
+        } else {
+            // Repeated "../" for each level need to reach the common path
+            $traverser = str_repeat('../', $depth);
+        }
 
         $endPathRemainder = implode('/', array_slice($endPathArr, $index));
 

src/Symfony/Component/Filesystem/Tests/FilesystemTest.php

@@ -781,6 +781,8 @@ public function providePathsForMakePathRelative()
             array('/a/aab/bb', '/a/aa/', '../aab/bb/'),
             array('/a/aab/bb/', '/a/aa', '../aab/bb/'),
             array('/a/aab/bb/', '/a/aa/', '../aab/bb/'),
+            array('/a/aab/bb/', '/', 'a/aab/bb/'),
+            array('/a/aab/bb/', '/b/aab', '../../a/aab/bb/'),
         );
 
         if ('\\' === DIRECTORY_SEPARATOR) {