From 92e1541b7052bf9d3b4924c3504a7c8d773a52c7 Mon Sep 17 00:00:00 2001
From: Peter Cottle <petermcottle@gmail.com>
Date: Sun, 4 Nov 2012 17:14:29 -0800
Subject: [PATCH] cherry pick error

---
 src/git.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/git.js b/src/git.js
index 15e2d614..a515cf5b 100644
--- a/src/git.js
+++ b/src/git.js
@@ -464,6 +464,15 @@ GitEngine.prototype.cherrypickStarter = function() {
 
 GitEngine.prototype.cherrypick = function(ref) {
   var commit = this.getCommitFromRef(ref);
+  // check if we already have that
+  var set = this.getUpstreamSet('HEAD');
+  if (set[commit.get('id')]) {
+    throw new GitError({
+      msg: "We already have that commit in our changes history! You can't cherry-pick it " +
+           "if it shows up in git log."
+    });
+  }
+
   // alter the ID slightly
   var id = this.rebaseAltID(commit.get('id'));