From 5274ba6907cc12d6e6556ff85cb0e4819bd3f730 Mon Sep 17 00:00:00 2001
From: Gerrit Pape <pape@smarden.org>
Date: Wed, 20 Feb 2008 15:10:17 +0000
Subject: [PATCH] git-clone.sh: properly configure remote even if remote's head
 is dangling

When cloning a remote repository which's HEAD refers to a nonexistent
ref, git-clone cloned all existing refs, but failed to write the
configuration for 'remote'.  Now it detects the dangling remote HEAD,
refuses to checkout any local branch since HEAD refers to nowhere, but
properly writes the configuration for 'remote', so that subsequent
'git fetch's don't fail.

The problem was reported by Daniel Jacobowitz through
 http://bugs.debian.org/466581

Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 git-clone.sh           | 18 +++++++++++++-----
 t/t5701-clone-local.sh |  8 ++++++++
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/git-clone.sh b/git-clone.sh
index b4e858c38..0d686c3a0 100755
--- a/git-clone.sh
+++ b/git-clone.sh
@@ -409,11 +409,12 @@ else
 	cd "$D" || exit
 fi
 
-if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
+if test -z "$bare"
 then
 	# a non-bare repository is always in separate-remote layout
 	remote_top="refs/remotes/$origin"
-	head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
+	head_sha1=
+	test ! -r "$GIT_DIR/REMOTE_HEAD" || head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 	case "$head_sha1" in
 	'ref: refs/'*)
 		# Uh-oh, the remote told us (http transport done against
@@ -470,9 +471,16 @@ then
 		git config branch."$head_points_at".merge "refs/heads/$head_points_at"
 		;;
 	'')
-		# Source had detached HEAD pointing nowhere
-		git update-ref --no-deref HEAD "$head_sha1" &&
-		rm -f "refs/remotes/$origin/HEAD"
+		if test -z "$head_sha1"
+		then
+			# Source had nonexistent ref in HEAD
+			echo >&2 "Warning: Remote HEAD refers to nonexistent ref, unable to checkout."
+			no_checkout=t
+		else
+			# Source had detached HEAD pointing nowhere
+			git update-ref --no-deref HEAD "$head_sha1" &&
+			rm -f "refs/remotes/$origin/HEAD"
+		fi
 		;;
 	esac
 
diff --git a/t/t5701-clone-local.sh b/t/t5701-clone-local.sh
index 822ac8c28..59a165a6d 100755
--- a/t/t5701-clone-local.sh
+++ b/t/t5701-clone-local.sh
@@ -63,4 +63,12 @@ test_expect_success 'Even without -l, local will make a hardlink' '
 	test 0 = $copied
 '
 
+test_expect_success 'local clone of repo with nonexistent ref in HEAD' '
+	cd "$D" &&
+	echo "ref: refs/heads/nonexistent" > a.git/HEAD &&
+	git clone a d &&
+	cd d &&
+	git fetch &&
+	test ! -e .git/refs/remotes/origin/HEAD'
+
 test_done
-- 
2.30.2