MAGETWO-67590: Fix filesystem permission issues #5372

Author: Oleksii Korshenko

lib/internal/Magento/Framework/Filesystem/Driver/File.php

@@ -843,6 +843,13 @@ public function fileUnlock($resource)
      */
     public function getAbsolutePath($basePath, $path, $scheme = null)
     {
+        // check if the path given is already an absolute path containing the
+        // basepath. so if the basepath starts at position 0 in the path, we
+        // must not concatinate them again because path is already absolute.
+        if (0 === strpos($path, $basePath)) {
+            return $this->getScheme($scheme) . $path;
+        }
+
         return $this->getScheme($scheme) . $basePath . ltrim($this->fixSeparator($path), '/');
     }
 

lib/internal/Magento/Framework/Filesystem/Driver/Http.php

@@ -213,6 +213,13 @@ public function fileReadLine($resource, $length, $ending = null)
      */
     public function getAbsolutePath($basePath, $path, $scheme = null)
     {
+        // check if the path given is already an absolute path containing the
+        // basepath. so if the basepath starts at position 0 in the path, we
+        // must not concatinate them again because path is already absolute.
+        if (0 === strpos($path, $basePath)) {
+            return $this->getScheme() . $path;
+        }
+
         return $this->getScheme() . $basePath . $path;
     }
 

lib/internal/Magento/Framework/Filesystem/Test/Unit/Driver/FileTest.php

@@ -30,14 +30,14 @@ public function testGetAbsolutePath($basePath, $path, $expected)
         $file = new File();
         $this->assertEquals($expected, $file->getAbsolutePath($basePath, $path));
     }
-    
+
     public function dataProviderForTestGetAbsolutePath()
     {
         return [
             ['/root/path/', 'sub', '/root/path/sub'],
             ['/root/path/', '/sub', '/root/path/sub'],
             ['/root/path/', '../sub', '/root/path/../sub'],
-            ['/root/path/', '/root/path/sub', '/root/path/root/path/sub'],
+            ['/root/path/', '/root/path/sub', '/root/path/sub'],
         ];
     }