From 42229f1040079c959ea47ed4232b008bf1e7b6db Mon Sep 17 00:00:00 2001
From: "William A. Kennington III" <william@wkennington.com>
Date: Thu, 9 Jan 2014 23:11:22 -0600
Subject: [PATCH] nix-prefetch-git: Convert relative submodule URLS to absolute
 URLS

nix-prefetch-git does not convert relative submodule urls into absolute
urls based on the parent's origin. This patch adds support for
repositories which are using the relative url syntax.
---
 pkgs/build-support/fetchgit/nix-prefetch-git | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/build-support/fetchgit/nix-prefetch-git b/pkgs/build-support/fetchgit/nix-prefetch-git
index 0afae009dc57..8d0de055c756 100755
--- a/pkgs/build-support/fetchgit/nix-prefetch-git
+++ b/pkgs/build-support/fetchgit/nix-prefetch-git
@@ -148,6 +148,12 @@ init_submodules(){
             git config -f .gitmodules --get-regexp submodule\.[^.]*\.path |
             sed -n "s,^\(.*\)\.path $dir\$,\\1,p")
         local url=$(git config -f .gitmodules --get ${name}.url);
+
+        # Get Absolute URL if we have a relative URL
+        if ! echo "$url" | grep '^[a-zA-Z]\+://' >/dev/null 2>&1; then
+          url="$(git config --get remote.origin.url)/$url"
+        fi
+
         clone "$dir" "$url" "$hash" "";
     done;
 }