X-Git-Url: http://aleph1.co.uk/gitweb/?a=blobdiff_plain;f=vendor%2Fsymfony%2Fhttp-foundation%2FFile%2FMimeType%2FFileBinaryMimeTypeGuesser.php;h=34e015ee5c4f17f9b8e5b471cd0523bf1d5ffa59;hb=4e1bfbf98b844da83b18aca92ef00f11a4735806;hp=f917a06d6ccbf421ffc8d98ae05a9dca8ce729c7;hpb=a2bd1bf0c2c1f1a17d188f4dc0726a45494cefae;p=yaffs-website

diff --git a/vendor/symfony/http-foundation/File/MimeType/FileBinaryMimeTypeGuesser.php b/vendor/symfony/http-foundation/File/MimeType/FileBinaryMimeTypeGuesser.php
index f917a06d6..34e015ee5 100644
--- a/vendor/symfony/http-foundation/File/MimeType/FileBinaryMimeTypeGuesser.php
+++ b/vendor/symfony/http-foundation/File/MimeType/FileBinaryMimeTypeGuesser.php
@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\HttpFoundation\File\MimeType;
 
-use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
+use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
 
 /**
  * Guesses the mime type with the binary "file" (only available on *nix).
@@ -24,8 +24,6 @@ class FileBinaryMimeTypeGuesser implements MimeTypeGuesserInterface
     private $cmd;
 
     /**
-     * Constructor.
-     *
      * The $cmd pattern must contain a "%s" string that will be replaced
      * with the file name to guess.
      *
@@ -45,7 +43,21 @@ class FileBinaryMimeTypeGuesser implements MimeTypeGuesserInterface
      */
     public static function isSupported()
     {
-        return '\\' !== DIRECTORY_SEPARATOR && function_exists('passthru') && function_exists('escapeshellarg');
+        static $supported = null;
+
+        if (null !== $supported) {
+            return $supported;
+        }
+
+        if ('\\' === \DIRECTORY_SEPARATOR || !\function_exists('passthru') || !\function_exists('escapeshellarg')) {
+            return $supported = false;
+        }
+
+        ob_start();
+        passthru('command -v file', $exitStatus);
+        $binPath = trim(ob_get_clean());
+
+        return $supported = 0 === $exitStatus && '' !== $binPath;
     }
 
     /**