Use git rev-parse --git-dir to find a git dir

lib/git-hooks.js

@@ -1,6 +1,7 @@
 var path = require('path');
 var util = require('util');
 var spawn = require('child_process').spawn;
+var execSync = require('child_process').execSync;
 var fs = require('fs');
 var fsHelpers = require('./fs-helpers');
 
@@ -165,27 +166,21 @@ function spawnHook(hookName, args) {
 }
 
 /**
- * Returns the closest git directory.
- * It starts looking from the current directory and does it up to the fs root.
- * It returns undefined in case where the specified directory isn't found.
+ * Runs git rev-parse to find the git directory of the currentPath.
  *
  * @param {String} [currentPath] Current started path to search.
  * @returns {String|undefined}
  */
 function getClosestGitPath(currentPath) {
-    currentPath = currentPath || process.cwd();
-
-    var dirnamePath = path.join(currentPath, '.git');
-
-    if (fsHelpers.exists(dirnamePath)) {
-        return dirnamePath;
-    }
-
-    var nextPath = path.resolve(currentPath, '..');
-
-    if (nextPath === currentPath) {
-        return;
+    try {
+        var result = execSync('git rev-parse --absolute-git-dir', {cwd: currentPath}).toString();
+        return result.replace(/\n/g, '');
+    } catch (error) {
+        if (error.status === 128) {
+            // No git dir?
+            return undefined;
+        }
+        // Throw any other errors
+        throw error;
     }
-
-    return getClosestGitPath(nextPath);
 }