From b240b939271ada4379f6a778470aefd8991e88d4 Mon Sep 17 00:00:00 2001
From: isaacs <i@izs.me>
Date: Mon, 3 Oct 2011 17:36:30 -0700
Subject: [PATCH] Fix #1491 Don't try to mkdir('/')

---
 lib/utils/mkdir-p.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/utils/mkdir-p.js b/lib/utils/mkdir-p.js
index e5245da71f4..212e50295db 100644
--- a/lib/utils/mkdir-p.js
+++ b/lib/utils/mkdir-p.js
@@ -27,6 +27,12 @@ function mkdir (ensure, mode, uid, gid, cb_) {
 
   ensure = path.resolve(ensure).replace(/\/+$/, '')
 
+  // mkdir("/") should not do anything, since that always exists.
+  if (!ensure
+      || (process.platform === "win32" && p.match(/^[a-zA-Z]:(\\|\/)?$/))) {
+    return cb_()
+  }
+
   if (mkdirCache.hasOwnProperty(ensure)) {
     return mkdirCache[ensure].push(cb_)
   }