Adding upstream version 1:2.43.0.upstream/1%2.43.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1086 insertions, 0 deletions

diff --git a/t/t7600-merge.sh b/t/t7600-merge.sh
new file mode 100755
index 0000000..e5ff073
--- /dev/null
+++ b/t/t7600-merge.sh
@@ -0,0 +1,1086 @@
+#!/bin/sh
+#
+# Copyright (c) 2007 Lars Hjemli
+#
+
+test_description='git merge
+
+Testing basic merge operations/option parsing.
+
+! [c0] commit 0
+ ! [c1] commit 1
+  ! [c2] commit 2
+   ! [c3] commit 3
+    ! [c4] c4
+     ! [c5] c5
+      ! [c6] c6
+       * [main] Merge commit 'c1'
+--------
+       - [main] Merge commit 'c1'
+ +     * [c1] commit 1
+      +  [c6] c6
+     +   [c5] c5
+    ++   [c4] c4
+   ++++  [c3] commit 3
+  +      [c2] commit 2
++++++++* [c0] commit 0
+'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-gpg.sh
+
+test_write_lines 1 2 3 4 5 6 7 8 9 >file
+cp file file.orig
+test_write_lines '1 X' 2 3 4 5 6 7 8 9 >file.1
+test_write_lines 1 2 '3 X' 4 5 6 7 8 9 >file.3
+test_write_lines 1 2 3 4 '5 X' 6 7 8 9 >file.5
+test_write_lines 1 2 3 4 5 6 7 8 '9 X' >file.9
+test_write_lines 1 2 3 4 5 6 7 8 '9 Y' >file.9y
+test_write_lines '1 X' 2 3 4 5 6 7 8 9 >result.1
+test_write_lines '1 X' 2 3 4 '5 X' 6 7 8 9 >result.1-5
+test_write_lines '1 X' 2 3 4 5 6 7 8 '9 X' >result.1-9
+test_write_lines '1 X' 2 3 4 '5 X' 6 7 8 '9 X' >result.1-5-9
+test_write_lines '1 X' 2 '3 X' 4 '5 X' 6 7 8 '9 X' >result.1-3-5-9
+test_write_lines 1 2 3 4 5 6 7 8 '9 Z' >result.9z
+
+create_merge_msgs () {
+	echo "Merge tag 'c2'" >msg.1-5 &&
+	echo "Merge tags 'c2' and 'c3'" >msg.1-5-9 &&
+	{
+		echo "Squashed commit of the following:" &&
+		echo &&
+		git log --no-merges ^HEAD c1
+	} >squash.1 &&
+	{
+		echo "Squashed commit of the following:" &&
+		echo &&
+		git log --no-merges ^HEAD c2
+	} >squash.1-5 &&
+	{
+		echo "Squashed commit of the following:" &&
+		echo &&
+		git log --no-merges ^HEAD c2 c3
+	} >squash.1-5-9 &&
+	{
+		echo "* tag 'c3':" &&
+		echo "  commit 3"
+	} >msg.log
+}
+
+verify_merge () {
+	test_cmp "$2" "$1" &&
+	git update-index --refresh &&
+	git diff --exit-code &&
+	if test -n "$3"
+	then
+		git show -s --pretty=tformat:%s HEAD >msg.act &&
+		test_cmp "$3" msg.act
+	fi
+}
+
+verify_head () {
+	echo "$1" >head.expected &&
+	git rev-parse HEAD >head.actual &&
+	test_cmp head.expected head.actual
+}
+
+verify_parents () {
+	test_write_lines "$@" >parents.expected &&
+	>parents.actual &&
+	i=1 &&
+	while test $i -le $#
+	do
+		git rev-parse HEAD^$i >>parents.actual &&
+		i=$(expr $i + 1) ||
+		return 1
+	done &&
+	test_must_fail git rev-parse --verify "HEAD^$i" &&
+	test_cmp parents.expected parents.actual
+}
+
+verify_mergeheads () {
+	test_write_lines "$@" >mergehead.expected &&
+	while read sha1 rest
+	do
+		git rev-parse $sha1 || return 1
+	done <.git/MERGE_HEAD >mergehead.actual &&
+	test_cmp mergehead.expected mergehead.actual
+}
+
+verify_no_mergehead () {
+	! test -e .git/MERGE_HEAD
+}
+
+test_expect_success 'setup' '
+	git add file &&
+	test_tick &&
+	git commit -m "commit 0" &&
+	git tag c0 &&
+	c0=$(git rev-parse HEAD) &&
+	cp file.1 file &&
+	git add file &&
+	cp file.1 other &&
+	git add other &&
+	test_tick &&
+	git commit -m "commit 1" &&
+	git tag c1 &&
+	c1=$(git rev-parse HEAD) &&
+	git reset --hard "$c0" &&
+	cp file.5 file &&
+	git add file &&
+	test_tick &&
+	git commit -m "commit 2" &&
+	git tag c2 &&
+	c2=$(git rev-parse HEAD) &&
+	git reset --hard "$c0" &&
+	cp file.9y file &&
+	git add file &&
+	test_tick &&
+	git commit -m "commit 7" &&
+	git tag c7 &&
+	git reset --hard "$c0" &&
+	cp file.9 file &&
+	git add file &&
+	test_tick &&
+	git commit -m "commit 3" &&
+	git tag c3 &&
+	c3=$(git rev-parse HEAD) &&
+	git reset --hard "$c0" &&
+	create_merge_msgs
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'test option parsing' '
+	test_must_fail git merge -$ c1 &&
+	test_must_fail git merge --no-such c1 &&
+	test_must_fail git merge -s foobar c1 &&
+	test_must_fail git merge -s=foobar c1 &&
+	test_must_fail git merge -m &&
+	test_must_fail git merge --abort foobar &&
+	test_must_fail git merge --abort --quiet &&
+	test_must_fail git merge --continue foobar &&
+	test_must_fail git merge --continue --quiet &&
+	test_must_fail git merge
+'
+
+test_expect_success 'merge -h with invalid index' '
+	mkdir broken &&
+	(
+		cd broken &&
+		git init &&
+		>.git/index &&
+		test_expect_code 129 git merge -h 2>usage
+	) &&
+	test_grep "[Uu]sage: git merge" broken/usage
+'
+
+test_expect_success 'reject non-strategy with a git-merge-foo name' '
+	test_must_fail git merge -s index c1
+'
+
+test_expect_success 'merge c0 with c1' '
+	echo "OBJID HEAD@{0}: merge c1: Fast-forward" >reflog.expected &&
+
+	git reset --hard c0 &&
+	git merge c1 &&
+	verify_merge file result.1 &&
+	verify_head "$c1" &&
+
+	git reflog -1 >reflog.actual &&
+	sed "s/$_x05[0-9a-f]*/OBJID/g" reflog.actual >reflog.fuzzy &&
+	test_cmp reflog.expected reflog.fuzzy
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c0 with c1 with --ff-only' '
+	git reset --hard c0 &&
+	git merge --ff-only c1 &&
+	git merge --ff-only HEAD c0 c1 &&
+	verify_merge file result.1 &&
+	verify_head "$c1"
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge from unborn branch' '
+	git checkout -f main &&
+	test_might_fail git branch -D kid &&
+
+	echo "OBJID HEAD@{0}: initial pull" >reflog.expected &&
+
+	git checkout --orphan kid &&
+	test_when_finished "git checkout -f main" &&
+	git rm -fr . &&
+	test_tick &&
+	git merge --ff-only c1 &&
+	verify_merge file result.1 &&
+	verify_head "$c1" &&
+
+	git reflog -1 >reflog.actual &&
+	sed "s/$_x05[0-9a-f][0-9a-f]/OBJID/g" reflog.actual >reflog.fuzzy &&
+	test_cmp reflog.expected reflog.fuzzy
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2' '
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c2 &&
+	verify_merge file result.1-5 msg.1-5 &&
+	verify_parents $c1 $c2
+'
+
+test_expect_success 'merge --squash c3 with c7' '
+	git reset --hard c3 &&
+	test_must_fail git merge --squash c7 &&
+	cat result.9z >file &&
+	git commit --no-edit -a &&
+
+	cat >expect <<-EOF &&
+	Squashed commit of the following:
+
+	$(git show -s c7)
+
+	# Conflicts:
+	#	file
+	EOF
+	git cat-file commit HEAD >raw &&
+	sed -e "1,/^$/d" raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'merge --squash --autostash conflict does not attempt to apply autostash' '
+	git reset --hard c3 &&
+	>unrelated &&
+	git add unrelated &&
+	test_must_fail git merge --squash c7 --autostash >out 2>err &&
+	! grep "Applying autostash resulted in conflicts." err &&
+	grep "When finished, apply stashed changes with \`git stash pop\`" out
+'
+
+test_expect_success 'merge c3 with c7 with commit.cleanup = scissors' '
+	git config commit.cleanup scissors &&
+	git reset --hard c3 &&
+	test_must_fail git merge c7 &&
+	cat result.9z >file &&
+	git commit --no-edit -a &&
+
+	cat >expect <<-\EOF &&
+	Merge tag '"'"'c7'"'"'
+
+	# ------------------------ >8 ------------------------
+	# Do not modify or remove the line above.
+	# Everything below it will be ignored.
+	#
+	# Conflicts:
+	#	file
+	EOF
+	git cat-file commit HEAD >raw &&
+	sed -e "1,/^$/d" raw >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'merge c3 with c7 with --squash commit.cleanup = scissors' '
+	git config commit.cleanup scissors &&
+	git reset --hard c3 &&
+	test_must_fail git merge --squash c7 &&
+	cat result.9z >file &&
+	git commit --no-edit -a &&
+
+	cat >expect <<-EOF &&
+	Squashed commit of the following:
+
+	$(git show -s c7)
+
+	# ------------------------ >8 ------------------------
+	# Do not modify or remove the line above.
+	# Everything below it will be ignored.
+	#
+	# Conflicts:
+	#	file
+	EOF
+	git cat-file commit HEAD >raw &&
+	sed -e "1,/^$/d" raw >actual &&
+	test_cmp expect actual
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 and c3' '
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c2 c3 &&
+	verify_merge file result.1-5-9 msg.1-5-9 &&
+	verify_parents $c1 $c2 $c3
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merges with --ff-only' '
+	git reset --hard c1 &&
+	test_tick &&
+	test_must_fail git merge --ff-only c2 &&
+	test_must_fail git merge --ff-only c3 &&
+	test_must_fail git merge --ff-only c2 c3 &&
+	git reset --hard c0 &&
+	git merge c3 &&
+	verify_head $c3
+'
+
+test_expect_success 'merges with merge.ff=only' '
+	git reset --hard c1 &&
+	test_tick &&
+	test_config merge.ff "only" &&
+	test_must_fail git merge c2 &&
+	test_must_fail git merge c3 &&
+	test_must_fail git merge c2 c3 &&
+	git reset --hard c0 &&
+	git merge c3 &&
+	verify_head $c3
+'
+
+test_expect_success 'merge c0 with c1 (no-commit)' '
+	git reset --hard c0 &&
+	git merge --no-commit c1 &&
+	verify_merge file result.1 &&
+	verify_head $c1
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 (no-commit)' '
+	git reset --hard c1 &&
+	git merge --no-commit c2 &&
+	verify_merge file result.1-5 &&
+	verify_head $c1 &&
+	verify_mergeheads $c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 and c3 (no-commit)' '
+	git reset --hard c1 &&
+	git merge --no-commit c2 c3 &&
+	verify_merge file result.1-5-9 &&
+	verify_head $c1 &&
+	verify_mergeheads $c2 $c3
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c0 with c1 (squash)' '
+	git reset --hard c0 &&
+	git merge --squash c1 &&
+	verify_merge file result.1 &&
+	verify_head $c0 &&
+	verify_no_mergehead &&
+	test_cmp squash.1 .git/SQUASH_MSG
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c0 with c1 (squash, ff-only)' '
+	git reset --hard c0 &&
+	git merge --squash --ff-only c1 &&
+	verify_merge file result.1 &&
+	verify_head $c0 &&
+	verify_no_mergehead &&
+	test_cmp squash.1 .git/SQUASH_MSG
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 (squash)' '
+	git reset --hard c1 &&
+	git merge --squash c2 &&
+	verify_merge file result.1-5 &&
+	verify_head $c1 &&
+	verify_no_mergehead &&
+	test_cmp squash.1-5 .git/SQUASH_MSG
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'unsuccessful merge of c1 with c2 (squash, ff-only)' '
+	git reset --hard c1 &&
+	test_must_fail git merge --squash --ff-only c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 and c3 (squash)' '
+	git reset --hard c1 &&
+	git merge --squash c2 c3 &&
+	verify_merge file result.1-5-9 &&
+	verify_head $c1 &&
+	verify_no_mergehead &&
+	test_cmp squash.1-5-9 .git/SQUASH_MSG
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 (no-commit in config)' '
+	git reset --hard c1 &&
+	test_config branch.main.mergeoptions "--no-commit" &&
+	git merge c2 &&
+	verify_merge file result.1-5 &&
+	verify_head $c1 &&
+	verify_mergeheads $c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 (log in config)' '
+	git reset --hard c1 &&
+	git merge --log c2 &&
+	git show -s --pretty=tformat:%s%n%b >expect &&
+
+	test_config branch.main.mergeoptions "--log" &&
+	git reset --hard c1 &&
+	git merge c2 &&
+	git show -s --pretty=tformat:%s%n%b >actual &&
+
+	test_cmp expect actual
+'
+
+test_expect_success 'merge c1 with c2 (log in config gets overridden)' '
+	git reset --hard c1 &&
+	git merge c2 &&
+	git show -s --pretty=tformat:%s%n%b >expect &&
+
+	test_config branch.main.mergeoptions "--no-log" &&
+	test_config merge.log "true" &&
+	git reset --hard c1 &&
+	git merge c2 &&
+	git show -s --pretty=tformat:%s%n%b >actual &&
+
+	test_cmp expect actual
+'
+
+test_expect_success 'merge c1 with c2 (squash in config)' '
+	git reset --hard c1 &&
+	test_config branch.main.mergeoptions "--squash" &&
+	git merge c2 &&
+	verify_merge file result.1-5 &&
+	verify_head $c1 &&
+	verify_no_mergehead &&
+	test_cmp squash.1-5 .git/SQUASH_MSG
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'override config option -n with --summary' '
+	git reset --hard c1 &&
+	test_config branch.main.mergeoptions "-n" &&
+	test_tick &&
+	git merge --summary c2 >diffstat.txt &&
+	verify_merge file result.1-5 msg.1-5 &&
+	verify_parents $c1 $c2 &&
+	if ! grep "^ file |  *2 +-$" diffstat.txt
+	then
+		echo "[OOPS] diffstat was not generated with --summary"
+		false
+	fi
+'
+
+test_expect_success 'override config option -n with --stat' '
+	git reset --hard c1 &&
+	test_config branch.main.mergeoptions "-n" &&
+	test_tick &&
+	git merge --stat c2 >diffstat.txt &&
+	verify_merge file result.1-5 msg.1-5 &&
+	verify_parents $c1 $c2 &&
+	if ! grep "^ file |  *2 +-$" diffstat.txt
+	then
+		echo "[OOPS] diffstat was not generated with --stat"
+		false
+	fi
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'override config option --stat' '
+	git reset --hard c1 &&
+	test_config branch.main.mergeoptions "--stat" &&
+	test_tick &&
+	git merge -n c2 >diffstat.txt &&
+	verify_merge file result.1-5 msg.1-5 &&
+	verify_parents $c1 $c2 &&
+	if grep "^ file |  *2 +-$" diffstat.txt
+	then
+		echo "[OOPS] diffstat was generated"
+		false
+	fi
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 (override --no-commit)' '
+	git reset --hard c1 &&
+	test_config branch.main.mergeoptions "--no-commit" &&
+	test_tick &&
+	git merge --commit c2 &&
+	verify_merge file result.1-5 msg.1-5 &&
+	verify_parents $c1 $c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c2 (override --squash)' '
+	git reset --hard c1 &&
+	test_config branch.main.mergeoptions "--squash" &&
+	test_tick &&
+	git merge --no-squash c2 &&
+	verify_merge file result.1-5 msg.1-5 &&
+	verify_parents $c1 $c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c0 with c1 (no-ff)' '
+	git reset --hard c0 &&
+	test_tick &&
+	git merge --no-ff c1 &&
+	verify_merge file result.1 &&
+	verify_parents $c0 $c1
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c0 with c1 (merge.ff=false)' '
+	git reset --hard c0 &&
+	test_config merge.ff "false" &&
+	test_tick &&
+	git merge c1 &&
+	verify_merge file result.1 &&
+	verify_parents $c0 $c1
+'
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'combine branch.main.mergeoptions with merge.ff' '
+	git reset --hard c0 &&
+	test_config branch.main.mergeoptions "--ff" &&
+	test_config merge.ff "false" &&
+	test_tick &&
+	git merge c1 &&
+	verify_merge file result.1 &&
+	verify_parents "$c0"
+'
+
+test_expect_success 'tolerate unknown values for merge.ff' '
+	git reset --hard c0 &&
+	test_config merge.ff "something-new" &&
+	test_tick &&
+	git merge c1 2>message &&
+	verify_head "$c1" &&
+	test_must_be_empty message
+'
+
+test_expect_success 'combining --squash and --no-ff is refused' '
+	git reset --hard c0 &&
+	test_must_fail git merge --squash --no-ff c1 &&
+	test_must_fail git merge --no-ff --squash c1
+'
+
+test_expect_success 'combining --squash and --commit is refused' '
+	git reset --hard c0 &&
+	test_must_fail git merge --squash --commit c1 &&
+	test_must_fail git merge --commit --squash c1
+'
+
+test_expect_success 'option --ff-only overwrites --no-ff' '
+	git merge --no-ff --ff-only c1 &&
+	test_must_fail git merge --no-ff --ff-only c2
+'
+
+test_expect_success 'option --no-ff overrides merge.ff=only config' '
+	git reset --hard c0 &&
+	test_config merge.ff only &&
+	git merge --no-ff c1
+'
+
+test_expect_success 'merge c0 with c1 (ff overrides no-ff)' '
+	git reset --hard c0 &&
+	test_config branch.main.mergeoptions "--no-ff" &&
+	git merge --ff c1 &&
+	verify_merge file result.1 &&
+	verify_head $c1
+'
+
+test_expect_success 'merge log message' '
+	git reset --hard c0 &&
+	git merge --no-log c2 &&
+	git show -s --pretty=format:%b HEAD >msg.act &&
+	test_must_be_empty msg.act &&
+
+	git reset --hard c0 &&
+	test_config branch.main.mergeoptions "--no-ff" &&
+	git merge --no-log c2 &&
+	git show -s --pretty=format:%b HEAD >msg.act &&
+	test_must_be_empty msg.act &&
+
+	git merge --log c3 &&
+	git show -s --pretty=format:%b HEAD >msg.act &&
+	test_cmp msg.log msg.act &&
+
+	git reset --hard HEAD^ &&
+	test_config merge.log "yes" &&
+	git merge c3 &&
+	git show -s --pretty=format:%b HEAD >msg.act &&
+	test_cmp msg.log msg.act
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c0, c2, c0, and c1' '
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c0 c2 c0 c1 &&
+	verify_merge file result.1-5 &&
+	verify_parents $c1 $c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c0, c2, c0, and c1' '
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c0 c2 c0 c1 &&
+	verify_merge file result.1-5 &&
+	verify_parents $c1 $c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge c1 with c1 and c2' '
+	git reset --hard c1 &&
+	test_tick &&
+	git merge c1 c2 &&
+	verify_merge file result.1-5 &&
+	verify_parents $c1 $c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge fast-forward in a dirty tree' '
+	git reset --hard c0 &&
+	mv file file1 &&
+	cat file1 >file &&
+	rm -f file1 &&
+	git merge c2
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'in-index merge' '
+	git reset --hard c0 &&
+	git merge --no-ff -s resolve c1 >out &&
+	test_grep "Wonderful." out &&
+	verify_parents $c0 $c1
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'refresh the index before merging' '
+	git reset --hard c1 &&
+	cp file file.n && mv -f file.n file &&
+	git merge c3
+'
+
+test_expect_success 'merge with --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9 &&
+	git merge --autostash c2 2>err &&
+	test_grep "Applied autostash." err &&
+	git show HEAD:file >merge-result &&
+	test_cmp result.1-5 merge-result &&
+	test_cmp result.1-5-9 file
+'
+
+test_expect_success 'merge with merge.autoStash' '
+	test_config merge.autoStash true &&
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9 &&
+	git merge c2 2>err &&
+	test_grep "Applied autostash." err &&
+	git show HEAD:file >merge-result &&
+	test_cmp result.1-5 merge-result &&
+	test_cmp result.1-5-9 file
+'
+
+test_expect_success 'fast-forward merge with --autostash' '
+	git reset --hard c0 &&
+	git merge-file file file.orig file.5 &&
+	git merge --autostash c1 2>err &&
+	test_grep "Applied autostash." err &&
+	test_cmp result.1-5 file
+'
+
+test_expect_success 'failed fast-forward merge with --autostash' '
+	git reset --hard c0 &&
+	git merge-file file file.orig file.5 &&
+	cp file.5 other &&
+	test_when_finished "rm other" &&
+	test_must_fail git merge --autostash c1 2>err &&
+	test_grep "Applied autostash." err &&
+	test_cmp file.5 file
+'
+
+test_expect_success 'octopus merge with --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.3 &&
+	git merge --autostash c2 c3 2>err &&
+	test_grep "Applied autostash." err &&
+	git show HEAD:file >merge-result &&
+	test_cmp result.1-5-9 merge-result &&
+	test_cmp result.1-3-5-9 file
+'
+
+test_expect_success 'failed merge (exit 2) with --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.5 &&
+	test_must_fail git merge -s recursive --autostash c2 c3 2>err &&
+	test_grep "Applied autostash." err &&
+	test_cmp result.1-5 file
+'
+
+test_expect_success 'conflicted merge with --autostash, --abort restores stash' '
+	git reset --hard c3 &&
+	cp file.1 file &&
+	test_must_fail git merge --autostash c7 &&
+	git merge --abort 2>err &&
+	test_grep "Applied autostash." err &&
+	test_cmp file.1 file
+'
+
+test_expect_success 'completed merge (git commit) with --no-commit and --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9 &&
+	git diff >expect &&
+	git merge --no-commit --autostash c2 &&
+	git stash show -p MERGE_AUTOSTASH >actual &&
+	test_cmp expect actual &&
+	git commit 2>err &&
+	test_grep "Applied autostash." err &&
+	git show HEAD:file >merge-result &&
+	test_cmp result.1-5 merge-result &&
+	test_cmp result.1-5-9 file
+'
+
+test_expect_success 'completed merge (git merge --continue) with --no-commit and --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9 &&
+	git diff >expect &&
+	git merge --no-commit --autostash c2 &&
+	git stash show -p MERGE_AUTOSTASH >actual &&
+	test_cmp expect actual &&
+	git merge --continue 2>err &&
+	test_grep "Applied autostash." err &&
+	git show HEAD:file >merge-result &&
+	test_cmp result.1-5 merge-result &&
+	test_cmp result.1-5-9 file
+'
+
+test_expect_success 'aborted merge (merge --abort) with --no-commit and --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9 &&
+	git diff >expect &&
+	git merge --no-commit --autostash c2 &&
+	git stash show -p MERGE_AUTOSTASH >actual &&
+	test_cmp expect actual &&
+	git merge --abort 2>err &&
+	test_grep "Applied autostash." err &&
+	git diff >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'aborted merge (reset --hard) with --no-commit and --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9 &&
+	git diff >expect &&
+	git merge --no-commit --autostash c2 &&
+	git stash show -p MERGE_AUTOSTASH >actual &&
+	test_cmp expect actual &&
+	git reset --hard 2>err &&
+	test_grep "Autostash exists; creating a new stash entry." err &&
+	git diff --exit-code
+'
+
+test_expect_success 'quit merge with --no-commit and --autostash' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9 &&
+	git diff >expect &&
+	git merge --no-commit --autostash c2 &&
+	git stash show -p MERGE_AUTOSTASH >actual &&
+	test_cmp expect actual &&
+	git diff HEAD >expect &&
+	git merge --quit 2>err &&
+	test_grep "Autostash exists; creating a new stash entry." err &&
+	git diff HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'merge with conflicted --autostash changes' '
+	git reset --hard c1 &&
+	git merge-file file file.orig file.9y &&
+	git diff >expect &&
+	test_when_finished "test_might_fail git stash drop" &&
+	git merge --autostash c3 2>err &&
+	test_grep "Applying autostash resulted in conflicts." err &&
+	git show HEAD:file >merge-result &&
+	test_cmp result.1-9 merge-result &&
+	git stash show -p >actual &&
+	test_cmp expect actual
+'
+
+cat >expected.branch <<\EOF
+Merge branch 'c5-branch' (early part)
+EOF
+cat >expected.tag <<\EOF
+Merge commit 'c5~1'
+EOF
+
+test_expect_success 'merge early part of c2' '
+	git reset --hard c3 &&
+	echo c4 >c4.c &&
+	git add c4.c &&
+	git commit -m c4 &&
+	git tag c4 &&
+	echo c5 >c5.c &&
+	git add c5.c &&
+	git commit -m c5 &&
+	git tag c5 &&
+	git reset --hard c3 &&
+	echo c6 >c6.c &&
+	git add c6.c &&
+	git commit -m c6 &&
+	git tag c6 &&
+	git branch -f c5-branch c5 &&
+	git merge c5-branch~1 &&
+	git show -s --pretty=tformat:%s HEAD >actual.branch &&
+	git reset --keep HEAD^ &&
+	git merge c5~1 &&
+	git show -s --pretty=tformat:%s HEAD >actual.tag &&
+	test_cmp expected.branch actual.branch &&
+	test_cmp expected.tag actual.tag
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'merge --no-ff --no-commit && commit' '
+	git reset --hard c0 &&
+	git merge --no-ff --no-commit c1 &&
+	EDITOR=: git commit &&
+	verify_parents $c0 $c1
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'amending no-ff merge commit' '
+	EDITOR=: git commit --amend &&
+	verify_parents $c0 $c1
+'
+
+test_debug 'git log --graph --decorate --oneline --all'
+
+cat >editor <<\EOF
+#!/bin/sh
+# Add a new message string that was not in the template
+(
+	echo "Merge work done on the side branch c1"
+	echo
+	cat "$1"
+) >"$1.tmp" && mv "$1.tmp" "$1"
+# strip comments and blank lines from end of message
+sed -e '/^#/d' "$1" | sed -e :a -e '/^\n*$/{$d;N;ba' -e '}' >expected
+EOF
+chmod 755 editor
+
+test_expect_success 'merge --no-ff --edit' '
+	git reset --hard c0 &&
+	EDITOR=./editor git merge --no-ff --edit c1 &&
+	verify_parents $c0 $c1 &&
+	git cat-file commit HEAD >raw &&
+	grep "work done on the side branch" raw &&
+	sed "1,/^$/d" >actual raw &&
+	test_cmp expected actual
+'
+
+test_expect_success 'merge annotated/signed tag w/o tracking' '
+	test_when_finished "rm -rf dst; git tag -d anno1" &&
+	git tag -a -m "anno c1" anno1 c1 &&
+	git init dst &&
+	git rev-parse c1 >dst/expect &&
+	(
+		# c0 fast-forwards to c1 but because this repository
+		# is not a "downstream" whose refs/tags follows along
+		# tag from the "upstream", this pull defaults to --no-ff
+		cd dst &&
+		git pull .. c0 &&
+		git pull .. anno1 &&
+		git rev-parse HEAD^2 >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success 'merge annotated/signed tag w/ tracking' '
+	test_when_finished "rm -rf dst; git tag -d anno1" &&
+	git tag -a -m "anno c1" anno1 c1 &&
+	git init dst &&
+	git rev-parse c1 >dst/expect &&
+	(
+		# c0 fast-forwards to c1 and because this repository
+		# is a "downstream" whose refs/tags follows along
+		# tag from the "upstream", this pull defaults to --ff
+		cd dst &&
+		git remote add origin .. &&
+		git pull origin c0 &&
+		git fetch origin &&
+		git merge anno1 &&
+		git rev-parse HEAD >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success GPG 'merge --ff-only tag' '
+	git reset --hard c0 &&
+	git commit --allow-empty -m "A newer commit" &&
+	git tag -s -m "A newer commit" signed &&
+	git reset --hard c0 &&
+
+	git merge --ff-only signed &&
+	git rev-parse signed^0 >expect &&
+	git rev-parse HEAD >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success GPG 'merge --no-edit tag should skip editor' '
+	git reset --hard c0 &&
+	git commit --allow-empty -m "A newer commit" &&
+	git tag -f -s -m "A newer commit" signed &&
+	git reset --hard c0 &&
+
+	EDITOR=false git merge --no-edit --no-ff signed &&
+	git rev-parse signed^0 >expect &&
+	git rev-parse HEAD^2 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'set up mod-256 conflict scenario' '
+	# 256 near-identical stanzas...
+	for i in $(test_seq 1 256); do
+		for j in 1 2 3 4 5; do
+			echo $i-$j || return 1
+		done
+	done >file &&
+	git add file &&
+	git commit -m base &&
+
+	# one side changes the first line of each to "main"
+	sed s/-1/-main/ file >tmp &&
+	mv tmp file &&
+	git commit -am main &&
+
+	# and the other to "side"; merging the two will
+	# yield 256 separate conflicts
+	git checkout -b side HEAD^ &&
+	sed s/-1/-side/ file >tmp &&
+	mv tmp file &&
+	git commit -am side
+'
+
+test_expect_success 'merge detects mod-256 conflicts (recursive)' '
+	git reset --hard &&
+	test_must_fail git merge -s recursive main
+'
+
+test_expect_success 'merge detects mod-256 conflicts (resolve)' '
+	git reset --hard &&
+	test_must_fail git merge -s resolve main
+'
+
+test_expect_success 'merge nothing into void' '
+	git init void &&
+	(
+		cd void &&
+		git remote add up .. &&
+		git fetch up &&
+		test_must_fail git merge FETCH_HEAD
+	)
+'
+
+test_expect_success 'merge can be completed with --continue' '
+	git reset --hard c0 &&
+	git merge --no-ff --no-commit c1 &&
+	git merge --continue &&
+	verify_parents $c0 $c1
+'
+
+write_script .git/FAKE_EDITOR <<EOF
+# kill -TERM command added below.
+EOF
+
+test_expect_success EXECKEEPSPID 'killed merge can be completed with --continue' '
+	git reset --hard c0 &&
+	! "$SHELL_PATH" -c '\''
+	  echo kill -TERM $$ >>.git/FAKE_EDITOR
+	  GIT_EDITOR=.git/FAKE_EDITOR
+	  export GIT_EDITOR
+	  exec git merge --no-ff --edit c1'\'' &&
+	git merge --continue &&
+	verify_parents $c0 $c1
+'
+
+test_expect_success 'merge --quit' '
+	git init merge-quit &&
+	(
+		cd merge-quit &&
+		test_commit base &&
+		echo one >>base.t &&
+		git commit -am one &&
+		git branch one &&
+		git checkout base &&
+		echo two >>base.t &&
+		git commit -am two &&
+		test_must_fail git -c rerere.enabled=true merge one &&
+		test_path_is_file .git/MERGE_HEAD &&
+		test_path_is_file .git/MERGE_MODE &&
+		test_path_is_file .git/MERGE_MSG &&
+		git rerere status >rerere.before &&
+		git merge --quit &&
+		test_path_is_missing .git/MERGE_HEAD &&
+		test_path_is_missing .git/MERGE_MODE &&
+		test_path_is_missing .git/MERGE_MSG &&
+		git rerere status >rerere.after &&
+		test_must_be_empty rerere.after &&
+		! test_cmp rerere.after rerere.before
+	)
+'
+
+test_expect_success 'merge suggests matching remote refname' '
+	git commit --allow-empty -m not-local &&
+	git update-ref refs/remotes/origin/not-local HEAD &&
+	git reset --hard HEAD^ &&
+
+	# This is white-box testing hackery; we happen to know
+	# that reading packed refs is more picky about the memory
+	# ownership of strings we pass to for_each_ref() callbacks.
+	git pack-refs --all --prune &&
+
+	test_must_fail git merge not-local 2>stderr &&
+	grep origin/not-local stderr
+'
+
+test_expect_success 'suggested names are not ambiguous' '
+	git update-ref refs/heads/origin/not-local HEAD &&
+	test_must_fail git merge not-local 2>stderr &&
+	grep remotes/origin/not-local stderr
+'
+
+test_done