From 7e35e914c1aa24957107c666c76f1d834ebae90a Mon Sep 17 00:00:00 2001
From: Daiderd Jordan <daiderd@gmail.com>
Date: Fri, 14 Dec 2018 20:07:23 +0100
Subject: [PATCH] fetchGit: allow fetching explicit refs

Trying to fetch refs that are not in refs/heads currently fails because
it looks for refs/heads/refs/foo instead of refs/foo.

eg.

	builtins.fetchGit {
	  url = https://github.com/NixOS/nixpkgs.git;
	  ref = "refs/pull/1024/head;
	}
---
 src/libexpr/primops/fetchGit.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/libexpr/primops/fetchGit.cc b/src/libexpr/primops/fetchGit.cc
index b46d2f258..588b0fa4d 100644
--- a/src/libexpr/primops/fetchGit.cc
+++ b/src/libexpr/primops/fetchGit.cc
@@ -94,7 +94,11 @@ GitInfo exportGit(ref<Store> store, const std::string & uri,
         runProgram("git", true, { "init", "--bare", cacheDir });
     }
 
-    Path localRefFile = cacheDir + "/refs/heads/" + *ref;
+    Path localRefFile;
+    if (ref->compare(0, 5, "refs/") == 0)
+        localRefFile = cacheDir + "/" + *ref;
+    else
+        localRefFile = cacheDir + "/refs/heads/" + *ref;
 
     bool doFetch;
     time_t now = time(0);