merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/t/t5543-atomic-push.sh

@@ -0,0 +1,194 @@
+#!/bin/sh
+
+test_description='pushing to a repository using the atomic push option'
+
+. ./test-lib.sh
+
+mk_repo_pair () {
+	rm -rf workbench upstream &&
+	test_create_repo upstream &&
+	test_create_repo workbench &&
+	(
+		cd upstream &&
+		git config receive.denyCurrentBranch warn
+	) &&
+	(
+		cd workbench &&
+		git remote add up ../upstream
+	)
+}
+
+# Compare the ref ($1) in upstream with a ref value from workbench ($2)
+# i.e. test_refs second HEAD@{2}
+test_refs () {
+	test $# = 2 &&
+	git -C upstream rev-parse --verify "$1" >expect &&
+	git -C workbench rev-parse --verify "$2" >actual &&
+	test_cmp expect actual
+}
+
+test_expect_success 'atomic push works for a single branch' '
+	mk_repo_pair &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git push --mirror up &&
+		test_commit two &&
+		git push --atomic up master
+	) &&
+	test_refs master master
+'
+
+test_expect_success 'atomic push works for two branches' '
+	mk_repo_pair &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git branch second &&
+		git push --mirror up &&
+		test_commit two &&
+		git checkout second &&
+		test_commit three &&
+		git push --atomic up master second
+	) &&
+	test_refs master master &&
+	test_refs second second
+'
+
+test_expect_success 'atomic push works in combination with --mirror' '
+	mk_repo_pair &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git checkout -b second &&
+		test_commit two &&
+		git push --atomic --mirror up
+	) &&
+	test_refs master master &&
+	test_refs second second
+'
+
+test_expect_success 'atomic push works in combination with --force' '
+	mk_repo_pair &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git branch second master &&
+		test_commit two_a &&
+		git checkout second &&
+		test_commit two_b &&
+		test_commit three_b &&
+		test_commit four &&
+		git push --mirror up &&
+		# The actual test is below
+		git checkout master &&
+		test_commit three_a &&
+		git checkout second &&
+		git reset --hard HEAD^ &&
+		git push --force --atomic up master second
+	) &&
+	test_refs master master &&
+	test_refs second second
+'
+
+# set up two branches where master can be pushed but second can not
+# (non-fast-forward). Since second can not be pushed the whole operation
+# will fail and leave master untouched.
+test_expect_success 'atomic push fails if one branch fails' '
+	mk_repo_pair &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git checkout -b second master &&
+		test_commit two &&
+		test_commit three &&
+		test_commit four &&
+		git push --mirror up &&
+		git reset --hard HEAD~2 &&
+		test_commit five &&
+		git checkout master &&
+		test_commit six &&
+		test_must_fail git push --atomic --all up
+	) &&
+	test_refs master HEAD@{7} &&
+	test_refs second HEAD@{4}
+'
+
+test_expect_success 'atomic push fails if one tag fails remotely' '
+	# prepare the repo
+	mk_repo_pair &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git checkout -b second master &&
+		test_commit two &&
+		git push --mirror up
+	) &&
+	# a third party modifies the server side:
+	(
+		cd upstream &&
+		git checkout second &&
+		git tag test_tag second
+	) &&
+	# see if we can now push both branches.
+	(
+		cd workbench &&
+		git checkout master &&
+		test_commit three &&
+		git checkout second &&
+		test_commit four &&
+		git tag test_tag &&
+		test_must_fail git push --tags --atomic up master second
+	) &&
+	test_refs master HEAD@{3} &&
+	test_refs second HEAD@{1}
+'
+
+test_expect_success 'atomic push obeys update hook preventing a branch to be pushed' '
+	mk_repo_pair &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git checkout -b second master &&
+		test_commit two &&
+		git push --mirror up
+	) &&
+	(
+		cd upstream &&
+		HOOKDIR="$(git rev-parse --git-dir)/hooks" &&
+		HOOK="$HOOKDIR/update" &&
+		mkdir -p "$HOOKDIR" &&
+		write_script "$HOOK" <<-\EOF
+			# only allow update to master from now on
+			test "$1" = "refs/heads/master"
+		EOF
+	) &&
+	(
+		cd workbench &&
+		git checkout master &&
+		test_commit three &&
+		git checkout second &&
+		test_commit four &&
+		test_must_fail git push --atomic up master second
+	) &&
+	test_refs master HEAD@{3} &&
+	test_refs second HEAD@{1}
+'
+
+test_expect_success 'atomic push is not advertised if configured' '
+	mk_repo_pair &&
+	(
+		cd upstream &&
+		git config receive.advertiseatomic 0
+	) &&
+	(
+		cd workbench &&
+		test_commit one &&
+		git push --mirror up &&
+		test_commit two &&
+		test_must_fail git push --atomic up master
+	) &&
+	test_refs master HEAD@{1}
+'
+
+test_done