From 974373dc40bfe5d2fc89e6b1fdf64af215a78440 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andre=CC=81=20Cruz?= <andremiguelcruz@msn.com>
Date: Tue, 30 Apr 2013 19:19:59 +0100
Subject: [PATCH] Throw an error if already resolving.

---
 lib/resolve/Resolver.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/resolve/Resolver.js b/lib/resolve/Resolver.js
index 0bdf4e65..3c09954e 100644
--- a/lib/resolve/Resolver.js
+++ b/lib/resolve/Resolver.js
@@ -45,6 +45,15 @@ Resolver.prototype.hasNew = function (canonicalPkg) {
 Resolver.prototype.resolve = function () {
     var that = this;
 
+    // If already resolving, throw an error
+    // We don't actually reject a promise because this is a
+    // serious logic error
+    if (this._resolving) {
+        throw new Error('Already resolving');
+    }
+
+    this._resolving = true;
+
     // Create temporary dir
     return this._createTempDir()
     // Resolve self
@@ -62,9 +71,11 @@ Resolver.prototype.resolve = function () {
         ]);
     })
     .then(function () {
+        that._resolving = false;
         // Resolve with the folder
         return that._tempDir;
     }, function (err) {
+        that._resolving = false;
         // If something went wrong, unset the temporary dir
         that._tempDir = null;
         throw err;