[Filesystem] Fix usages of error_get_last()

Author: nicolas-grekas

Filesystem.php

@@ -21,6 +21,8 @@
  */
 class Filesystem
 {
+    private static $lastError;
+
     /**
      * Copies a file.
      *
@@ -95,12 +97,11 @@ public function mkdir($dirs, $mode = 0777)
                 continue;
             }
 
-            if (true !== @mkdir($dir, $mode, true)) {
-                $error = error_get_last();
+            if (!self::box('mkdir', $dir, $mode, true)) {
                 if (!is_dir($dir)) {
                     // The directory was not created by a concurrent process. Let's throw an exception with a developer friendly error message if we have one
-                    if ($error) {
-                        throw new IOException(sprintf('Failed to create "%s": %s.', $dir, $error['message']), 0, null, $dir);
+                    if (self::$lastError) {
+                        throw new IOException(sprintf('Failed to create "%s": %s.', $dir, self::$lastError), 0, null, $dir);
                     }
                     throw new IOException(sprintf('Failed to create "%s"', $dir), 0, null, $dir);
                 }
@@ -169,20 +170,17 @@ public function remove($files)
         foreach ($files as $file) {
             if (is_link($file)) {
                 // See https://bugs.php.net/52176
-                if (!@(unlink($file) || '\\' !== DIRECTORY_SEPARATOR || rmdir($file)) && file_exists($file)) {
-                    $error = error_get_last();
-                    throw new IOException(sprintf('Failed to remove symlink "%s": %s.', $file, $error['message']));
+                if (!(self::box('unlink', $file) || '\\' !== DIRECTORY_SEPARATOR || self::box('rmdir', $file)) && file_exists($file)) {
+                    throw new IOException(sprintf('Failed to remove symlink "%s": %s.', $file, self::$lastError));
                 }
             } elseif (is_dir($file)) {
                 $this->remove(new \FilesystemIterator($file, \FilesystemIterator::CURRENT_AS_PATHNAME | \FilesystemIterator::SKIP_DOTS));
 
-                if (!@rmdir($file) && file_exists($file)) {
-                    $error = error_get_last();
-                    throw new IOException(sprintf('Failed to remove directory "%s": %s.', $file, $error['message']));
+                if (!self::box('rmdir', $file) && file_exists($file)) {
+                    throw new IOException(sprintf('Failed to remove directory "%s": %s.', $file, self::$lastError));
                 }
-            } elseif (!@unlink($file) && file_exists($file)) {
-                $error = error_get_last();
-                throw new IOException(sprintf('Failed to remove file "%s": %s.', $file, $error['message']));
+            } elseif (!self::box('unlink', $file) && file_exists($file)) {
+                throw new IOException(sprintf('Failed to remove file "%s": %s.', $file, self::$lastError));
             }
         }
     }
@@ -336,19 +334,16 @@ public function symlink($originDir, $targetDir, $copyOnWindows = false)
 
         $this->mkdir(dirname($targetDir));
 
-        $ok = false;
         if (is_link($targetDir)) {
-            if (readlink($targetDir) != $originDir) {
-                $this->remove($targetDir);
-            } else {
-                $ok = true;
+            if (readlink($targetDir) === $originDir) {
+                return;
             }
+            $this->remove($targetDir);
         }
 
-        if (!$ok && true !== @symlink($originDir, $targetDir)) {
-            $report = error_get_last();
-            if (is_array($report)) {
-                if ('\\' === DIRECTORY_SEPARATOR && false !== strpos($report['message'], 'error code(1314)')) {
+        if (!self::box('symlink', $originDir, $targetDir)) {
+            if (null !== self::$lastError) {
+                if ('\\' === DIRECTORY_SEPARATOR && false !== strpos(self::$lastError, 'error code(1314)')) {
                     throw new IOException('Unable to create symlink due to error code 1314: \'A required privilege is not held by the client\'. Do you have the required Administrator-rights?', 0, null, $targetDir);
                 }
             }
@@ -580,4 +575,29 @@ private function toIterator($files)
 
         return $files;
     }
+
+    private static function box($func)
+    {
+        self::$lastError = null;
+        \set_error_handler(__CLASS__.'::handleError');
+        try {
+            $result = \call_user_func_array($func, \array_slice(\func_get_args(), 1));
+            \restore_error_handler();
+
+            return $result;
+        } catch (\Throwable $e) {
+        } catch (\Exception $e) {
+        }
+        \restore_error_handler();
+
+        throw $e;
+    }
+
+    /**
+     * @internal
+     */
+    public static function handleError($type, $msg)
+    {
+        self::$lastError = $msg;
+    }
 }