From 2b5ef661116a5e51dbcb06706360fe1e4365c5fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Wed, 18 Nov 2009 16:42:35 +0000
Subject: [PATCH] Ask `nix-prefetch-git' to leave `.git' in the output.

---
 src/lib/Hydra/Helper/AddBuilds.pm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/lib/Hydra/Helper/AddBuilds.pm b/src/lib/Hydra/Helper/AddBuilds.pm
index 99013ac8..9df15dd1 100644
--- a/src/lib/Hydra/Helper/AddBuilds.pm
+++ b/src/lib/Hydra/Helper/AddBuilds.pm
@@ -238,7 +238,12 @@ 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";
+
+	# Checked out code often wants to be able to run `git
+	# describe', e.g., code that uses Gnulib's `git-version-gen'
+	# script.  Thus, we leave `.git' in there.
+	$ENV{"NIX_PREFETCH_GIT_LEAVE_DOT_GIT"} = "1";
+
         my $stdout; my $stderr;
 	(my $res, $stdout, $stderr) = captureStdoutStderr(
 	    "nix-prefetch-git", $uri);