Apply realpath only if valid directory was returned

Author: BrainMaestro

src/helpers.php

@@ -47,13 +47,13 @@ function global_hook_dir()
      */
     function git_dir()
     {
-        $gitDir = realpath(trim(shell_exec('git rev-parse --git-common-dir')));
+        $gitDir = trim(shell_exec('git rev-parse --git-common-dir'));
         if ($gitDir === null || $gitDir === '' || $gitDir === '--git-common-dir') {
             // the version of git does not support `--git-common-dir`
             // we fallback to `--git-dir` which and lose worktree support
             return realpath(trim(shell_exec('git rev-parse --git-dir')));
         }
 
-        return $gitDir;
+        return realpath($gitDir);
     }
 }