Don't assume that file binary exists on *nix OS

Certain lightweight distributions such as Alpine Linux (popular for smaller Docker images) do not include it by default.
symfony · Apr 12, 2018 · 825f359 · 825f359
1 parent 1067468
commit 825f359
Showing 1 changed file with 11 additions and 1 deletion.
diff --git a/src/Symfony/Component/HttpFoundation/File/MimeType/FileBinaryMimeTypeGuesser.php b/src/Symfony/Component/HttpFoundation/File/MimeType/FileBinaryMimeTypeGuesser.php
@@ -43,7 +43,7 @@ public function __construct($cmd = 'file -b --mime %s 2>/dev/null')
      */
     public static function isSupported()
     {
-        return '\\' !== DIRECTORY_SEPARATOR && function_exists('passthru') && function_exists('escapeshellarg');
+        return '\\' !== DIRECTORY_SEPARATOR && function_exists('passthru') && function_exists('escapeshellarg') && static::hasFileBinary();
     }
 
     /**
@@ -82,4 +82,14 @@ public function guess($path)
 
         return $match[1];
     }
+
+    /**
+     * @return bool
+     */
+    private static function hasFileBinary()
+    {
+        static $result;
+
+        return isset($result) ? $result : ($result = null !== shell_exec('command -v file'));
+    }
 }