[PATCH 1/2] t5516-fetch-push: fix 'push with dry-run' test

["SZEDER Gábor" <szeder.dev@gmail.com>]

In a while-at-it cleanup replacing a 'cd dir && <...> && cd ..' with a
subshell, commit 28391a80a9 (receive-pack: allow deletion of corrupt
refs, 2007-11-29) also moved the assignment of the $old_commit
variable to that subshell.  This variable, however, is used outside of
that subshell as a parameter of check_push_result(), to check that a
ref still points to the commit where it is supposed to.  With the
variable remaining unset outside the subshell check_push_result()
doesn't perform that check at all.

Use 'git -C <dir> cmd...', so we don't need to change directory, and
thus don't need the subshell either when setting $old_commit.

Furthermore, change check_push_result() to require at least three
parameters (the repo, the oid, and at least one ref), so it will catch
similar issues earlier should they ever arise.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 t/t5516-fetch-push.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 82239138d5..832b79ad40 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -94,6 +94,9 @@ mk_child() {
 }
 
 check_push_result () {
+	test $# -ge 3 ||
+	error "bug in the test script: check_push_result requires at least 3 parameters"
+
 	repo_name="$1"
 	shift
 
@@ -553,10 +556,7 @@ test_expect_success 'branch.*.pushremote config order is irrelevant' '
 test_expect_success 'push with dry-run' '
 
 	mk_test testrepo heads/master &&
-	(
-		cd testrepo &&
-		old_commit=$(git show-ref -s --verify refs/heads/master)
-	) &&
+	old_commit=$(git -C testrepo show-ref -s --verify refs/heads/master) &&
 	git push --dry-run testrepo : &&
 	check_push_result testrepo $old_commit heads/master
 '
-- 
2.17.0.756.gcf614c5aff