fetch+push tests: use "test_hook" and "test_when_finished" pattern

Change the "t5516-fetch-push.sh" test code to make use of the new
"test_hook" helper, and to use "test_when_finished" to have tests
clean up their own state, instead of relying on subsequent tests to
clean the trash directory.

Before this each test would have been responsible for cleaning up
after a preceding test (which may or may not have run, e.g. if --run
or "GIT_SKIP_TESTS" was used), now each test will instead clean up
after itself.

In order to use both "test_hook" and "test_when_finished" we need to
move them out of sub-shells, which requires some refactoring.

While we're at it split up the "push with negotiation" test, now the
middle of the test doesn't need to "rm event", and since it delimited
two halves that were testing two different things the end-state is
easier to read and reason about.

While changing these lines make the minor change from "-fr" to "-rf"
as the "rm" argument, some of them used it already, it's more common
in the test suite, and it leaves the end-state of the file with more
consistency.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5516-fetch-push.sh

@@ -23,13 +23,10 @@ D=$(pwd)
 
 mk_empty () {
 	repo_name="$1"
-	rm -fr "$repo_name" &&
+	test_when_finished "rm -rf \"$repo_name\"" &&
-	mkdir "$repo_name" &&
+	test_path_is_missing "$repo_name" &&
-	(
+	git init "$repo_name" &&
-		cd "$repo_name" &&
+	git -C "$repo_name" config receive.denyCurrentBranch warn
-		git init &&
-		git config receive.denyCurrentBranch warn
-	)
 }
 
 mk_test () {
@@ -58,40 +55,28 @@ mk_test () {
 mk_test_with_hooks() {
 	repo_name=$1
 	mk_test "$@" &&
-	(
+	test_hook -C "$repo_name" pre-receive <<-'EOF' &&
-		cd "$repo_name" &&
-		mkdir .git/hooks &&
-		cd .git/hooks &&
-
-		cat >pre-receive <<-'EOF' &&
-		#!/bin/sh
 	cat - >>pre-receive.actual
 	EOF
 
-		cat >update <<-'EOF' &&
+	test_hook -C "$repo_name" update <<-'EOF' &&
-		#!/bin/sh
 	printf "%s %s %s\n" "$@" >>update.actual
 	EOF
 
-		cat >post-receive <<-'EOF' &&
+	test_hook -C "$repo_name" post-receive <<-'EOF' &&
-		#!/bin/sh
 	cat - >>post-receive.actual
 	EOF
 
-		cat >post-update <<-'EOF' &&
+	test_hook -C "$repo_name" post-update <<-'EOF'
-		#!/bin/sh
 	for ref in "$@"
 	do
 		printf "%s\n" "$ref" >>post-update.actual
 	done
 	EOF
-
-		chmod +x pre-receive update post-receive post-update
-	)
 }
 
 mk_child() {
-	rm -rf "$2" &&
+	test_when_finished "rm -rf \"$2\"" &&
 	git clone "$1" "$2"
 }
 
@@ -196,32 +181,32 @@ grep_wrote () {
 	grep 'write_pack_file/wrote.*"value":"'$1'"' $2
 }
 
-test_expect_success 'push with negotiation' '
+test_expect_success 'push without negotiation' '
-	# Without negotiation
 	mk_empty testrepo &&
 	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
 	test_commit -C testrepo unrelated_commit &&
 	git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
-	echo now pushing without negotiation &&
+	test_when_finished "rm event" &&
 	GIT_TRACE2_EVENT="$(pwd)/event" git -c protocol.version=2 push testrepo refs/heads/main:refs/remotes/origin/main &&
-	grep_wrote 5 event && # 2 commits, 2 trees, 1 blob
+	grep_wrote 5 event # 2 commits, 2 trees, 1 blob
+'
 
-	# Same commands, but with negotiation
+test_expect_success 'push with negotiation' '
-	rm event &&
 	mk_empty testrepo &&
 	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
 	test_commit -C testrepo unrelated_commit &&
 	git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+	test_when_finished "rm event" &&
 	GIT_TRACE2_EVENT="$(pwd)/event" git -c protocol.version=2 -c push.negotiate=1 push testrepo refs/heads/main:refs/remotes/origin/main &&
 	grep_wrote 2 event # 1 commit, 1 tree
 '
 
 test_expect_success 'push with negotiation proceeds anyway even if negotiation fails' '
-	rm event &&
 	mk_empty testrepo &&
 	git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
 	test_commit -C testrepo unrelated_commit &&
 	git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+	test_when_finished "rm event" &&
 	GIT_TEST_PROTOCOL_VERSION=0 GIT_TRACE2_EVENT="$(pwd)/event" \
 		git -c push.negotiate=1 push testrepo refs/heads/main:refs/remotes/origin/main 2>err &&
 	grep_wrote 5 event && # 2 commits, 2 trees, 1 blob
@@ -667,7 +652,6 @@ test_expect_success 'push does not update local refs on failure' '
 
 	mk_test testrepo heads/main &&
 	mk_child testrepo child &&
-	mkdir testrepo/.git/hooks &&
 	echo "#!/no/frobnication/today" >testrepo/.git/hooks/pre-receive &&
 	chmod +x testrepo/.git/hooks/pre-receive &&
 	(
@@ -1329,7 +1313,7 @@ done
 
 test_expect_success 'fetch follows tags by default' '
 	mk_test testrepo heads/main &&
-	rm -fr src dst &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
 	(
 		cd src &&
@@ -1339,6 +1323,7 @@ test_expect_success 'fetch follows tags by default' '
 		sed -n "p; s|refs/heads/main$|refs/remotes/origin/main|p" tmp1 |
 		sort -k 3 >../expect
 	) &&
+	test_when_finished "rm -rf dst" &&
 	git init dst &&
 	(
 		cd dst &&
@@ -1364,8 +1349,9 @@ test_expect_success 'peeled advertisements are not considered ref tips' '
 
 test_expect_success 'pushing a specific ref applies remote.$name.push as refmap' '
 	mk_test testrepo heads/main &&
-	rm -fr src dst &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
@@ -1388,8 +1374,9 @@ test_expect_success 'pushing a specific ref applies remote.$name.push as refmap'
 
 test_expect_success 'with no remote.$name.push, it is not used as refmap' '
 	mk_test testrepo heads/main &&
-	rm -fr src dst &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
@@ -1410,8 +1397,9 @@ test_expect_success 'with no remote.$name.push, it is not used as refmap' '
 
 test_expect_success 'with no remote.$name.push, upstream mapping is used' '
 	mk_test testrepo heads/main &&
-	rm -fr src dst &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
@@ -1439,8 +1427,9 @@ test_expect_success 'with no remote.$name.push, upstream mapping is used' '
 
 test_expect_success 'push does not follow tags by default' '
 	mk_test testrepo heads/main &&
-	rm -fr src dst &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
@@ -1462,8 +1451,9 @@ test_expect_success 'push does not follow tags by default' '
 
 test_expect_success 'push --follow-tags only pushes relevant tags' '
 	mk_test testrepo heads/main &&
-	rm -fr src dst &&
+	test_when_finished "rm -rf src" &&
 	git init src &&
+	test_when_finished "rm -rf dst" &&
 	git init --bare dst &&
 	(
 		cd src &&
@@ -1501,9 +1491,9 @@ EOF
 '
 
 test_expect_success 'pushing a tag pushes the tagged object' '
-	rm -rf dst.git &&
 	blob=$(echo unreferenced | git hash-object -w --stdin) &&
 	git tag -m foo tag-of-blob $blob &&
+	test_when_finished "rm -rf dst.git" &&
 	git init --bare dst.git &&
 	git push dst.git tag-of-blob &&
 	# the receiving index-pack should have noticed
@@ -1514,7 +1504,7 @@ test_expect_success 'pushing a tag pushes the tagged object' '
 '
 
 test_expect_success 'push into bare respects core.logallrefupdates' '
-	rm -rf dst.git &&
+	test_when_finished "rm -rf dst.git" &&
 	git init --bare dst.git &&
 	git -C dst.git config core.logallrefupdates true &&
 
@@ -1532,7 +1522,7 @@ test_expect_success 'push into bare respects core.logallrefupdates' '
 '
 
 test_expect_success 'fetch into bare respects core.logallrefupdates' '
-	rm -rf dst.git &&
+	test_when_finished "rm -rf dst.git" &&
 	git init --bare dst.git &&
 	(
 		cd dst.git &&
@@ -1553,6 +1543,7 @@ test_expect_success 'fetch into bare respects core.logallrefupdates' '
 '
 
 test_expect_success 'receive.denyCurrentBranch = updateInstead' '
+	mk_empty testrepo &&
 	git push testrepo main &&
 	(
 		cd testrepo &&
@@ -1655,7 +1646,7 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 	) &&
 
 	# (5) push into void
-	rm -fr void &&
+	test_when_finished "rm -rf void" &&
 	git init void &&
 	(
 		cd void &&
@@ -1677,15 +1668,13 @@ test_expect_success 'receive.denyCurrentBranch = updateInstead' '
 '
 
 test_expect_success 'updateInstead with push-to-checkout hook' '
-	rm -fr testrepo &&
+	test_when_finished "rm -rf testrepo" &&
 	git init testrepo &&
-	(
+	git -C testrepo pull .. main &&
-		cd testrepo &&
+	git -C testrepo reset --hard HEAD^^ &&
-		git pull .. main &&
+	git -C testrepo tag initial &&
-		git reset --hard HEAD^^ &&
+	git -C testrepo config receive.denyCurrentBranch updateInstead &&
-		git tag initial &&
+	test_hook -C testrepo push-to-checkout <<-\EOF &&
-		git config receive.denyCurrentBranch updateInstead &&
-		write_script .git/hooks/push-to-checkout <<-\EOF
 	echo >&2 updating from $(git rev-parse HEAD)
 	echo >&2 updating to "$1"
 
@@ -1696,7 +1685,6 @@ test_expect_success 'updateInstead with push-to-checkout hook' '
 		exit $status
 	}
 	EOF
-	) &&
 
 	# Try pushing into a pristine
 	git push testrepo main &&
@@ -1739,12 +1727,10 @@ test_expect_success 'updateInstead with push-to-checkout hook' '
 	) &&
 
 	# push into void
-	rm -fr void &&
+	test_when_finished "rm -rf void" &&
 	git init void &&
-	(
+	git -C void config receive.denyCurrentBranch updateInstead &&
-		cd void &&
+	test_hook -C void push-to-checkout <<-\EOF &&
-		git config receive.denyCurrentBranch updateInstead &&
-		write_script .git/hooks/push-to-checkout <<-\EOF
 	if git rev-parse --quiet --verify HEAD
 	then
 		has_head=yes
@@ -1767,7 +1753,6 @@ test_expect_success 'updateInstead with push-to-checkout hook' '
 		exit $status
 	}
 	EOF
-	) &&
 
 	git push void main &&
 	(