[PATCH 3/3] t5403: do not use access repos with GIT_DIR when worktree is involved

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Setting GIT_DIR alone means worktree is current directory for legacy
reasons. Avoid using that, instead go to the worktree and execute
commands there.

The troublesome command is "GIT_DIR=clone2/.git git add clone2/b". The
real worktree is clone2, but that command tells git worktree is $(pwd).
What does user expect to add then? Should the new entry in index be "b"
or "clone2/b"?

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 t/t5403-post-checkout-hook.sh |   17 ++++++++++-------
 1 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/t/t5403-post-checkout-hook.sh b/t/t5403-post-checkout-hook.sh
index 6643f32..3459539 100755
--- a/t/t5403-post-checkout-hook.sh
+++ b/t/t5403-post-checkout-hook.sh
@@ -13,10 +13,13 @@ test_expect_success setup '
 	git commit -m setup &&
 	git clone ./. clone1 &&
 	git clone ./. clone2 &&
-	GIT_DIR=clone2/.git git branch new2 &&
-	echo Data for commit1. >clone2/b &&
-	GIT_DIR=clone2/.git git add clone2/b &&
-	GIT_DIR=clone2/.git git commit -m new2
+	(
+		cd clone2 &&
+		git branch new2 &&
+		echo Data for commit1. >b &&
+		git add b &&
+		git commit -m new2
+	)
 '
 
 for clone in 1 2; do
@@ -45,7 +48,7 @@ test_expect_success 'post-checkout runs as expected ' '
 '
 
 test_expect_success 'post-checkout args are correct with git checkout -b ' '
-	GIT_DIR=clone1/.git git checkout -b new1 &&
+	( cd clone1 && git checkout -b new1 ) &&
 	old=$(awk "{print \$1}" clone1/.git/post-checkout.args) &&
 	new=$(awk "{print \$2}" clone1/.git/post-checkout.args) &&
 	flag=$(awk "{print \$3}" clone1/.git/post-checkout.args) &&
@@ -53,7 +56,7 @@ test_expect_success 'post-checkout args are correct with git checkout -b ' '
 '
 
 test_expect_success 'post-checkout receives the right args with HEAD changed ' '
-	GIT_DIR=clone2/.git git checkout new2 &&
+	( cd clone2 && git checkout new2 ) &&
 	old=$(awk "{print \$1}" clone2/.git/post-checkout.args) &&
 	new=$(awk "{print \$2}" clone2/.git/post-checkout.args) &&
 	flag=$(awk "{print \$3}" clone2/.git/post-checkout.args) &&
@@ -61,7 +64,7 @@ test_expect_success 'post-checkout receives the right args with HEAD changed ' '
 '
 
 test_expect_success 'post-checkout receives the right args when not switching branches ' '
-	GIT_DIR=clone2/.git git checkout master b &&
+	( cd clone2 && git checkout master b ) &&
 	old=$(awk "{print \$1}" clone2/.git/post-checkout.args) &&
 	new=$(awk "{print \$2}" clone2/.git/post-checkout.args) &&
 	flag=$(awk "{print \$3}" clone2/.git/post-checkout.args) &&
-- 
1.7.3.1.256.g2539c.dirty