check-attr: move to the top of working tree when in non-bare repository

Lasse Makholm noticed that running "git check-attr" from a place
totally unrelated to $GIT_DIR and $GIT_WORK_TREE does not give
expected results.  I think it is because the command does not say it
wants to call setup_work_tree().

We still need to support use cases where only a bare repository is
involved, so unconditionally requiring a working tree would not work
well.  Instead, make a call only in a non-bare repository.

We may want to see if we want to do a similar fix in the opposite
direction to check-ignore.  The command unconditionally requires a
working tree, but it should be usable in a bare repository just like
check-attr attempts to be.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
index 0554b130f2..6e6aef5988 100755
--- a/t/t0003-attributes.sh
+++ b/t/t0003-attributes.sh
@@ -196,6 +196,16 @@ test_expect_success 'root subdir attribute test' '
 	attr_check subdir/a/i unspecified
 '
 
+test_expect_success 'using --git-dir and --work-tree' '
+	mkdir unreal real &&
+	git init real &&
+	echo "file test=in-real" >real/.gitattributes &&
+	(
+		cd unreal &&
+		attr_check file in-real "--git-dir ../real/.git --work-tree ../real"
+	)
+'
+
 test_expect_success 'setup bare' '
 	git clone --bare . bare.git
 '