From a56802f7c001699f2292afeb90dd9bad99391939 Mon Sep 17 00:00:00 2001
From: Jaakko Manninen <jaakko@rocketpack.fi>
Date: Thu, 31 Jan 2013 13:45:36 +0200
Subject: dont call cb unless defined in unlock, warn if unlocking twice

---
 lib/cache.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/cache.js b/lib/cache.js
index 33df21720..acde8bbf7 100644
--- a/lib/cache.js
+++ b/lib/cache.js
@@ -1096,8 +1096,12 @@ function LockFile(path) {
 LockFile.prototype.unlock = function(cb) {
   var self = this
 
-  if (!this.locked)
-    return cb()
+  if (!this.locked) {
+    console.trace()
+    console.warn('LockFile.unlock() called twice for '+this.path)
+    if (cb) cb()
+    return
+  }
 
   lockFile.unlock(this.path, function(er) {
     self.locked = false
-- 
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