From cdfc96194c564bc283db037fe8d91dc05c294c57 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Wed, 18 Nov 2009 16:25:47 +0000
Subject: [PATCH] Use $NIX_PREFETCH_GIT_CHECKOUT_HOOK to produce a
 `.git-version' file.

---
 src/lib/Hydra/Helper/AddBuilds.pm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lib/Hydra/Helper/AddBuilds.pm b/src/lib/Hydra/Helper/AddBuilds.pm
index 77f377d3..99013ac8 100644
--- a/src/lib/Hydra/Helper/AddBuilds.pm
+++ b/src/lib/Hydra/Helper/AddBuilds.pm
@@ -238,6 +238,7 @@ sub fetchInputGit {
 	print STDERR "checking out Git input from $uri";
 	$ENV{"NIX_HASH_ALGO"} = "sha256";
 	$ENV{"PRINT_PATH"} = "1";
+	$ENV{"NIX_PREFETCH_GIT_CHECKOUT_HOOK"} = "git describe > .git-version";
         my $stdout; my $stderr;
 	(my $res, $stdout, $stderr) = captureStdoutStderr(
 	    "nix-prefetch-git", $uri);