From a176db6937e62cbae43086a729bf47c76214cbd6 Mon Sep 17 00:00:00 2001
From: Tuncer Ayaz <tuncer.ayaz@gmail.com>
Date: Thu, 2 Feb 2012 22:50:32 +0100
Subject: [PATCH] Fix Dialyzer (race condition) warning

---
 src/rebar_utils.erl | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/rebar_utils.erl b/src/rebar_utils.erl
index afb8c00..113dd21 100644
--- a/src/rebar_utils.erl
+++ b/src/rebar_utils.erl
@@ -190,10 +190,11 @@ expand_env_variable(InStr, VarName, RawVarValue) ->
 
 vcs_vsn(Vcs, Dir) ->
     Key = {Vcs, Dir},
-    case ets:lookup(rebar_vsn_cache, Key) of
-        [{Key, VsnString}] ->
-            VsnString;
-        [] ->
+    try ets:lookup_element(rebar_vsn_cache, Key, 2) of
+        VsnString ->
+            VsnString
+    catch
+        error:badarg ->
             VsnString = vcs_vsn_1(Vcs, Dir),
             ets:insert(rebar_vsn_cache, {Key, VsnString}),
             VsnString