t/t7600-merge.sh - jrn/git - Git at Google

 #!/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
        * [master] Merge commit 'c1'
 --------
        - [master] Merge commit 'c1'
  +     * [c1] commit 1
       +  [c6] c6
      +   [c5] c5
     ++   [c4] c4
    ++++  [c3] commit 3
   +      [c2] commit 2
 +++++++* [c0] commit 0
 '

 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-gpg.sh

 printf '%s\n' 1 2 3 4 5 6 7 8 9 >file
 printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >file.1
 printf '%s\n' 1 2 3 4 '5 X' 6 7 8 9 >file.5
 printf '%s\n' 1 2 3 4 5 6 7 8 '9 X' >file.9
 printf '%s\n' 1 2 3 4 5 6 7 8 '9 Y' >file.9y
 printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >result.1
 printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 9 >result.1-5
 printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 '9 X' >result.1-5-9
 printf '%s\n' 1 2 3 4 5 6 7 8 '9 Z' >result.9z
 >empty

 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 &&
 	: >msg.nologff &&
 	: >msg.nolognoff &&
 	{
 		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 () {
 	printf '%s\n' "$@" >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 () {
 	printf '%s\n' "$@" >mergehead.expected &&
 	while read sha1 rest
 	do
 		git rev-parse $sha1
 	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=$(git rev-parse HEAD) &&
 	cp file.1 file &&
 	git add file &&
 	test_tick &&
 	git commit -m "commit 1" &&
 	git tag c1 &&
 	c1=$(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_i18ngrep "[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 master &&
 	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 master" &&
 	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 <<-EOF
 		Squashed commit of the following:

 		$(git show -s c7)

 		# Conflicts:
 		#	file
 		EOF
 	} >expect &&
 	git cat-file commit HEAD | sed -e '1,/^$/d' >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.master.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.master.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.master.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.master.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.master.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.master.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.master.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.master.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.master.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.master.mergeoptions with merge.ff' '
 	git reset --hard c0 &&
 	test_config branch.master.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_cmp 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 '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.master.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_cmp msg.nologff msg.act &&

 	git reset --hard c0 &&
 	test_config branch.master.mergeoptions "--no-ff" &&
 	git merge --no-log c2 &&
 	git show -s --pretty=format:%b HEAD >msg.act &&
 	test_cmp msg.nolognoff 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_i18ngrep "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
 '

 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
 		done
 	done >file &&
 	git add file &&
 	git commit -m base &&

 	# one side changes the first line of each to "master"
 	sed s/-1/-master/ <file >tmp &&
 	mv tmp file &&
 	git commit -am master &&

 	# 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 master
 '

 test_expect_success 'merge detects mod-256 conflicts (resolve)' '
 	git reset --hard &&
 	test_must_fail git merge -s resolve master
 '

 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_done
	#!/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
	* [master] Merge commit 'c1'
	--------
	- [master] Merge commit 'c1'
	+ * [c1] commit 1
	+ [c6] c6
	+ [c5] c5
	++ [c4] c4
	++++ [c3] commit 3
	+ [c2] commit 2
	+++++++* [c0] commit 0
	'

	. ./test-lib.sh
	. "$TEST_DIRECTORY"/lib-gpg.sh

	printf '%s\n' 1 2 3 4 5 6 7 8 9 >file
	printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >file.1
	printf '%s\n' 1 2 3 4 '5 X' 6 7 8 9 >file.5
	printf '%s\n' 1 2 3 4 5 6 7 8 '9 X' >file.9
	printf '%s\n' 1 2 3 4 5 6 7 8 '9 Y' >file.9y
	printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >result.1
	printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 9 >result.1-5
	printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 '9 X' >result.1-5-9
	printf '%s\n' 1 2 3 4 5 6 7 8 '9 Z' >result.9z
	>empty

	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 &&
	: >msg.nologff &&
	: >msg.nolognoff &&
	{
	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 () {
	printf '%s\n' "$@" >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 () {
	printf '%s\n' "$@" >mergehead.expected &&
	while read sha1 rest
	do
	git rev-parse $sha1
	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=$(git rev-parse HEAD) &&
	cp file.1 file &&
	git add file &&
	test_tick &&
	git commit -m "commit 1" &&
	git tag c1 &&
	c1=$(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_i18ngrep "[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 master &&
	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 master" &&
	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 <<-EOF
	Squashed commit of the following:

	$(git show -s c7)

	# Conflicts:
	# file
	EOF
	} >expect &&
	git cat-file commit HEAD \| sed -e '1,/^$/d' >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.master.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.master.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.master.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.master.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.master.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.master.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.master.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.master.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.master.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.master.mergeoptions with merge.ff' '
	git reset --hard c0 &&
	test_config branch.master.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_cmp 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 '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.master.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_cmp msg.nologff msg.act &&

	git reset --hard c0 &&
	test_config branch.master.mergeoptions "--no-ff" &&
	git merge --no-log c2 &&
	git show -s --pretty=format:%b HEAD >msg.act &&
	test_cmp msg.nolognoff 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_i18ngrep "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
	'

	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
	done
	done >file &&
	git add file &&
	git commit -m base &&

	# one side changes the first line of each to "master"
	sed s/-1/-master/ <file >tmp &&
	mv tmp file &&
	git commit -am master &&

	# 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 master
	'

	test_expect_success 'merge detects mod-256 conflicts (resolve)' '
	git reset --hard &&
	test_must_fail git merge -s resolve master
	'

	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_done