bug symfony#16292 fix race condition at mkdir (symfony#16258) (ewgRa)

This PR was submitted for the 2.8 branch but it was merged into the 2.3 branch instead (closes symfony#16292).

Discussion
----------

fix race condition at mkdir (symfony#16258)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#16258
| License       | MIT
| Doc PR        |

Commits
-------

2c2836c fix race condition at mkdir (symfony#16258)

Author: fabpot

src/Symfony/Component/HttpKernel/HttpCache/Store.php

@@ -32,12 +32,16 @@ class Store implements StoreInterface
      * Constructor.
      *
      * @param string $root The path to the cache directory
+     *
+     * @throws \RuntimeException
      */
     public function __construct($root)
     {
         $this->root = $root;
         if (!is_dir($this->root)) {
-            mkdir($this->root, 0777, true);
+            if (false === @mkdir($this->root, 0777, true) && !is_dir($this->root)) {
+                throw new \RuntimeException(sprintf('Unable to create the store directory (%s).', $this->root));
+            }
         }
         $this->keyCache = new \SplObjectStorage();
         $this->locks = array();
@@ -74,7 +78,7 @@ public function cleanup()
     public function lock(Request $request)
     {
         $path = $this->getPath($this->getCacheKey($request).'.lck');
-        if (!is_dir(dirname($path)) && false === @mkdir(dirname($path), 0777, true)) {
+        if (!is_dir(dirname($path)) && false === @mkdir(dirname($path), 0777, true) && !is_dir(dirname($path))) {
             return false;
         }
 
@@ -338,7 +342,7 @@ private function load($key)
     private function save($key, $data)
     {
         $path = $this->getPath($key);
-        if (!is_dir(dirname($path)) && false === @mkdir(dirname($path), 0777, true)) {
+        if (!is_dir(dirname($path)) && false === @mkdir(dirname($path), 0777, true) && !is_dir(dirname($path))) {
             return false;
         }
 

src/Symfony/Component/HttpKernel/Profiler/FileProfilerStorage.php

@@ -41,8 +41,8 @@ public function __construct($dsn)
         }
         $this->folder = substr($dsn, 5);
 
-        if (!is_dir($this->folder)) {
-            mkdir($this->folder, 0777, true);
+        if (!is_dir($this->folder) && false === @mkdir($this->folder, 0777, true) && !is_dir($this->folder)) {
+            throw new \RuntimeException(sprintf('Unable to create the storage directory (%s).', $this->folder));
         }
     }
 
@@ -125,6 +125,8 @@ public function read($token)
 
     /**
      * {@inheritdoc}
+     *
+     * @throws \RuntimeException
      */
     public function write(Profile $profile)
     {
@@ -134,8 +136,8 @@ public function write(Profile $profile)
         if (!$profileIndexed) {
             // Create directory
             $dir = dirname($file);
-            if (!is_dir($dir)) {
-                mkdir($dir, 0777, true);
+            if (!is_dir($dir) && false === @mkdir($dir, 0777, true) && !is_dir($dir)) {
+                throw new \RuntimeException(sprintf('Unable to create the storage directory (%s).', $dir));
             }
         }