Parse commit from packed refs if not available in refs dir. (#163)

* Add .idea to .gitignore

* Added alternative method for parsing current commit with test.

* Fixing test.

* Remove dependency on fs-extra.

1 files changed, 20 insertions, 1 deletions

diff --git a/lib/detectLocalGit.js b/lib/detectLocalGit.js
index ac8ed29..46a9e67 100644
--- a/lib/detectLocalGit.js
+++ b/lib/detectLocalGit.js
@@ -23,6 +23,25 @@ module.exports = function detectLocalGit() {
   if (!branch)
     return { git_commit: head };
 
-  var commit = fs.readFileSync(path.join(dir, '.git', 'refs', 'heads', branch), 'utf-8').trim();
+  var commit = _parseCommitHashFromRef(dir, branch);
+
   return { git_commit: commit, git_branch: branch };
 };
+
+function _parseCommitHashFromRef(dir, branch) {
+    var ref = path.join(dir, '.git', 'refs', 'heads', branch);
+    if (fs.existsSync(ref)) {
+        return fs.readFileSync(ref, 'utf-8').trim();
+    } else {
+        // ref does not exist; get it from packed-refs
+        var commit = '';
+        var packedRefs = path.join(dir, '.git', 'packed-refs');
+        var packedRefsText = fs.readFileSync(packedRefs, 'utf-8');
+        packedRefsText.split('\n').forEach(function (line) {
+            if (line.match('refs/heads/'+branch)) {
+                commit = line.split(' ')[0];
+            }
+        });
+        return commit;
+    }
+}