3 files changed, 347 insertions, 0 deletions
diff --git a/t/t7505-prepare-commit-msg-hook.sh b/t/t7505-prepare-commit-msg-hook.sh
new file mode 100755
index 0000000..2128142
--- /dev/null
+++ b/t/t7505-prepare-commit-msg-hook.sh
@@ -0,0 +1,311 @@
+#!/bin/sh
+
+test_description='prepare-commit-msg hook'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success 'set up commits for rebasing' '
+	test_commit root &&
+	test_commit a a a &&
+	test_commit b b b &&
+	git checkout -b rebase-me root &&
+	test_commit rebase-a a aa &&
+	test_commit rebase-b b bb &&
+	for i in $(test_seq 1 13)
+	do
+		test_commit rebase-$i c $i || return 1
+	done &&
+	git checkout main &&
+
+	cat >rebase-todo <<-EOF
+	pick $(git rev-parse rebase-a)
+	pick $(git rev-parse rebase-b)
+	fixup $(git rev-parse rebase-1)
+	fixup $(git rev-parse rebase-2)
+	pick $(git rev-parse rebase-3)
+	fixup $(git rev-parse rebase-4)
+	squash $(git rev-parse rebase-5)
+	reword $(git rev-parse rebase-6)
+	squash $(git rev-parse rebase-7)
+	fixup $(git rev-parse rebase-8)
+	fixup $(git rev-parse rebase-9)
+	edit $(git rev-parse rebase-10)
+	squash $(git rev-parse rebase-11)
+	squash $(git rev-parse rebase-12)
+	edit $(git rev-parse rebase-13)
+	EOF
+'
+
+test_expect_success 'with no hook' '
+
+	echo "foo" > file &&
+	git add file &&
+	git commit -m "first"
+
+'
+
+test_expect_success 'setup fake editor for interactive editing' '
+	write_script fake-editor <<-\EOF &&
+	exit 0
+	EOF
+
+	## Not using test_set_editor here so we can easily ensure the editor variable
+	## is only set for the editor tests
+	FAKE_EDITOR="$(pwd)/fake-editor" &&
+	export FAKE_EDITOR
+'
+
+test_expect_success 'setup prepare-commit-msg hook' '
+	test_hook --setup prepare-commit-msg <<\EOF
+GIT_DIR=$(git rev-parse --git-dir)
+if test -d "$GIT_DIR/rebase-merge"
+then
+	rebasing=1
+else
+	rebasing=0
+fi
+
+get_last_cmd () {
+	tail -n1 "$GIT_DIR/rebase-merge/done" | {
+		read cmd id _
+		git log --pretty="[$cmd %s]" -n1 $id
+	}
+}
+
+if test "$2" = commit
+then
+	if test $rebasing = 1
+	then
+		source="$3"
+	else
+		source=$(git rev-parse "$3")
+	fi
+else
+	source=${2-default}
+fi
+test "$GIT_EDITOR" = : && source="$source (no editor)"
+
+if test $rebasing = 1
+then
+	echo "$source $(get_last_cmd)" >"$1"
+else
+	sed -e "1s/.*/$source/" "$1" >msg.tmp
+	mv msg.tmp "$1"
+fi
+exit 0
+EOF
+'
+
+echo dummy template > "$(git rev-parse --git-dir)/template"
+
+test_expect_success 'with hook (-m)' '
+
+	echo "more" >> file &&
+	git add file &&
+	git commit -m "more" &&
+	test "$(git log -1 --pretty=format:%s)" = "message (no editor)"
+
+'
+
+test_expect_success 'with hook (-m editor)' '
+
+	echo "more" >> file &&
+	git add file &&
+	GIT_EDITOR="\"\$FAKE_EDITOR\"" git commit -e -m "more more" &&
+	test "$(git log -1 --pretty=format:%s)" = message
+
+'
+
+test_expect_success 'with hook (-t)' '
+
+	echo "more" >> file &&
+	git add file &&
+	git commit -t "$(git rev-parse --git-dir)/template" &&
+	test "$(git log -1 --pretty=format:%s)" = template
+
+'
+
+test_expect_success 'with hook (-F)' '
+
+	echo "more" >> file &&
+	git add file &&
+	(echo more | git commit -F -) &&
+	test "$(git log -1 --pretty=format:%s)" = "message (no editor)"
+
+'
+
+test_expect_success 'with hook (-F editor)' '
+
+	echo "more" >> file &&
+	git add file &&
+	(echo more more | GIT_EDITOR="\"\$FAKE_EDITOR\"" git commit -e -F -) &&
+	test "$(git log -1 --pretty=format:%s)" = message
+
+'
+
+test_expect_success 'with hook (-C)' '
+
+	head=$(git rev-parse HEAD) &&
+	echo "more" >> file &&
+	git add file &&
+	git commit -C $head &&
+	test "$(git log -1 --pretty=format:%s)" = "$head (no editor)"
+
+'
+
+test_expect_success 'with hook (editor)' '
+
+	echo "more more" >> file &&
+	git add file &&
+	GIT_EDITOR="\"\$FAKE_EDITOR\"" git commit &&
+	test "$(git log -1 --pretty=format:%s)" = default
+
+'
+
+test_expect_success 'with hook (--amend)' '
+
+	head=$(git rev-parse HEAD) &&
+	echo "more" >> file &&
+	git add file &&
+	GIT_EDITOR="\"\$FAKE_EDITOR\"" git commit --amend &&
+	test "$(git log -1 --pretty=format:%s)" = "$head"
+
+'
+
+test_expect_success 'with hook (-c)' '
+
+	head=$(git rev-parse HEAD) &&
+	echo "more" >> file &&
+	git add file &&
+	GIT_EDITOR="\"\$FAKE_EDITOR\"" git commit -c $head &&
+	test "$(git log -1 --pretty=format:%s)" = "$head"
+
+'
+
+test_expect_success 'with hook (merge)' '
+
+	test_when_finished "git checkout -f main" &&
+	git checkout -B other HEAD@{1} &&
+	echo "more" >>file &&
+	git add file &&
+	git commit -m other &&
+	git checkout - &&
+	git merge --no-ff other &&
+	test "$(git log -1 --pretty=format:%s)" = "merge (no editor)"
+'
+
+test_expect_success 'with hook and editor (merge)' '
+
+	test_when_finished "git checkout -f main" &&
+	git checkout -B other HEAD@{1} &&
+	echo "more" >>file &&
+	git add file &&
+	git commit -m other &&
+	git checkout - &&
+	env GIT_EDITOR="\"\$FAKE_EDITOR\"" git merge --no-ff -e other &&
+	test "$(git log -1 --pretty=format:%s)" = "merge"
+'
+
+test_rebase () {
+	expect=$1 &&
+	mode=$2 &&
+	test_expect_$expect "with hook (rebase ${mode:--i})" '
+		test_when_finished "\
+			git rebase --abort
+			git checkout -f main
+			git branch -D tmp" &&
+		git checkout -b tmp rebase-me &&
+		GIT_SEQUENCE_EDITOR="cp rebase-todo" &&
+		GIT_EDITOR="\"$FAKE_EDITOR\"" &&
+		(
+			export GIT_SEQUENCE_EDITOR GIT_EDITOR &&
+			test_must_fail git rebase -i $mode b &&
+			echo x >a &&
+			git add a &&
+			test_must_fail git rebase --continue &&
+			echo x >b &&
+			git add b &&
+			git commit &&
+			git rebase --continue &&
+			echo y >a &&
+			git add a &&
+			git commit &&
+			git rebase --continue &&
+			echo y >b &&
+			git add b &&
+			git rebase --continue
+		) &&
+		git log --pretty=%s -g -n18 HEAD@{1} >actual &&
+		test_cmp "$TEST_DIRECTORY/t7505/expected-rebase${mode:--i}" actual
+	'
+}
+
+test_rebase success
+
+test_expect_success 'with hook (cherry-pick)' '
+	test_when_finished "git checkout -f main" &&
+	git checkout -B other b &&
+	git cherry-pick rebase-1 &&
+	test "$(git log -1 --pretty=format:%s)" = "message (no editor)"
+'
+
+test_expect_success 'with hook and editor (cherry-pick)' '
+	test_when_finished "git checkout -f main" &&
+	git checkout -B other b &&
+	git cherry-pick -e rebase-1 &&
+	test "$(git log -1 --pretty=format:%s)" = merge
+'
+
+test_expect_success 'setup: commit-msg hook that always fails' '
+	test_hook --setup --clobber prepare-commit-msg <<-\EOF
+	exit 1
+	EOF
+'
+
+test_expect_success 'with failing hook' '
+
+	test_when_finished "git checkout -f main" &&
+	head=$(git rev-parse HEAD) &&
+	echo "more" >> file &&
+	git add file &&
+	test_must_fail env GIT_EDITOR="\"\$FAKE_EDITOR\"" git commit -c $head
+
+'
+
+test_expect_success 'with failing hook (--no-verify)' '
+
+	test_when_finished "git checkout -f main" &&
+	head=$(git rev-parse HEAD) &&
+	echo "more" >> file &&
+	git add file &&
+	test_must_fail env GIT_EDITOR="\"\$FAKE_EDITOR\"" git commit --no-verify -c $head
+
+'
+
+test_expect_success 'with failing hook (merge)' '
+
+	test_when_finished "git checkout -f main" &&
+	git checkout -B other HEAD@{1} &&
+	echo "more" >> file &&
+	git add file &&
+	test_hook --remove prepare-commit-msg &&
+	git commit -m other &&
+	test_hook --setup prepare-commit-msg <<-\EOF &&
+	exit 1
+	EOF
+	git checkout - &&
+	test_must_fail git merge --no-ff other
+
+'
+
+test_expect_success 'with failing hook (cherry-pick)' '
+	test_when_finished "git checkout -f main" &&
+	git checkout -B other b &&
+	test_must_fail git cherry-pick rebase-1 2>actual &&
+	test $(grep -c prepare-commit-msg actual) = 1
+'
+
+test_done
diff --git a/t/t7505/expected-rebase-i b/t/t7505/expected-rebase-i
new file mode 100644
index 0000000..93bada5
--- /dev/null
+++ b/t/t7505/expected-rebase-i
@@ -0,0 +1,18 @@
+message [edit rebase-13]
+message (no editor) [edit rebase-13]
+message [squash rebase-12]
+message (no editor) [squash rebase-11]
+default [edit rebase-10]
+message (no editor) [edit rebase-10]
+message [fixup rebase-9]
+message (no editor) [fixup rebase-8]
+message (no editor) [squash rebase-7]
+HEAD [reword rebase-6]
+message (no editor) [reword rebase-6]
+message [squash rebase-5]
+message (no editor) [fixup rebase-4]
+message (no editor) [pick rebase-3]
+message (no editor) [fixup rebase-2]
+message (no editor) [fixup rebase-1]
+merge [pick rebase-b]
+message [pick rebase-a]
diff --git a/t/t7505/expected-rebase-p b/t/t7505/expected-rebase-p
new file mode 100644
index 0000000..93bada5
--- /dev/null
+++ b/t/t7505/expected-rebase-p
@@ -0,0 +1,18 @@
+message [edit rebase-13]
+message (no editor) [edit rebase-13]
+message [squash rebase-12]
+message (no editor) [squash rebase-11]
+default [edit rebase-10]
+message (no editor) [edit rebase-10]
+message [fixup rebase-9]
+message (no editor) [fixup rebase-8]
+message (no editor) [squash rebase-7]
+HEAD [reword rebase-6]
+message (no editor) [reword rebase-6]
+message [squash rebase-5]
+message (no editor) [fixup rebase-4]
+message (no editor) [pick rebase-3]
+message (no editor) [fixup rebase-2]
+message (no editor) [fixup rebase-1]
+merge [pick rebase-b]
+message [pick rebase-a]