guaranteeing that cache keys don't exceed 140 characters

Author: weaverryan

src/Downloader.php

@@ -447,6 +447,9 @@ private static function generateCacheKey(string $url): string
         $url = preg_replace('{^https://api.github.com/repos/([^/]++/[^/]++)/contents/}', '$1/', $url);
         $url = preg_replace('{^https://raw.githubusercontent.com/([^/]++/[^/]++)/}', '$1/', $url);
 
-        return preg_replace('{[^a-z0-9.]}i', '-', $url);
+        $key = preg_replace('{[^a-z0-9.]}i', '-', $url);
+
+        // eCryptfs can have problems with filenames longer than around 143 chars
+        return \strlen($key) > 140 ? md5($url) : $key;
     }
 }