t/t3430-rebase-merges.sh - git - Git at Google

 #!/bin/sh
 #
 # Copyright (c) 2018 Johannes E. Schindelin
 #

 test_description='git rebase -i --rebase-merges

 This test runs git rebase "interactively", retaining the branch structure by
 recreating merge commits.

 Initial setup:

     -- B --                   (first)
    /       \
  A - C - D - E - H            (main)
    \    \       /
     \    F - G                (second)
      \
       Conflicting-G
 '
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME

 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-rebase.sh
 . "$TEST_DIRECTORY"/lib-log-graph.sh

 test_cmp_graph () {
 	cat >expect &&
 	lib_test_cmp_graph --boundary --format=%s "$@"
 }

 test_expect_success 'setup' '
 	write_script replace-editor.sh <<-\EOF &&
 	mv "$1" "$(git rev-parse --git-path ORIGINAL-TODO)"
 	cp script-from-scratch "$1"
 	EOF

 	test_commit A &&
 	git checkout -b first &&
 	test_commit B &&
 	b=$(git rev-parse --short HEAD) &&
 	git checkout main &&
 	test_commit C &&
 	c=$(git rev-parse --short HEAD) &&
 	test_commit D &&
 	d=$(git rev-parse --short HEAD) &&
 	git merge --no-commit B &&
 	test_tick &&
 	git commit -m E &&
 	git tag -m E E &&
 	e=$(git rev-parse --short HEAD) &&
 	git checkout -b second C &&
 	test_commit F &&
 	f=$(git rev-parse --short HEAD) &&
 	test_commit G &&
 	g=$(git rev-parse --short HEAD) &&
 	git checkout main &&
 	git merge --no-commit G &&
 	test_tick &&
 	git commit -m H &&
 	h=$(git rev-parse --short HEAD) &&
 	git tag -m H H &&
 	git checkout A &&
 	test_commit conflicting-G G.t
 '

 test_expect_success 'create completely different structure' '
 	cat >script-from-scratch <<-\EOF &&
 	label onto

 	# onebranch
 	pick G
 	pick D
 	label onebranch

 	# second
 	reset onto
 	pick B
 	label second

 	reset onto
 	merge -C H second
 	merge onebranch # Merge the topic branch '\''onebranch'\''
 	EOF
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
 	git rebase -i -r A main &&
 	test_cmp_graph <<-\EOF
 	*   Merge the topic branch '\''onebranch'\''
 	|\
 	| * D
 	| * G
 	* |   H
 	|\ \
 	| |/
 	|/|
 	| * B
 	|/
 	* A
 	EOF
 '

 test_expect_success 'generate correct todo list' '
 	cat >expect <<-EOF &&
 	label onto

 	reset onto
 	pick $b B
 	label E

 	reset onto
 	pick $c C
 	label branch-point
 	pick $f F
 	pick $g G
 	label H

 	reset branch-point # C
 	pick $d D
 	merge -C $e E # E
 	merge -C $h H # H

 	EOF

 	grep -v "^#" <.git/ORIGINAL-TODO >output &&
 	test_cmp expect output
 '

 test_expect_success '`reset` refuses to overwrite untracked files' '
 	git checkout -b refuse-to-reset &&
 	test_commit dont-overwrite-untracked &&
 	git checkout @{-1} &&
 	: >dont-overwrite-untracked.t &&
 	echo "reset refs/tags/dont-overwrite-untracked" >script-from-scratch &&
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_must_fail git rebase -ir HEAD &&
 	git rebase --abort
 '

 test_expect_success 'failed `merge -C` writes patch (may be rescheduled, too)' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout -b conflicting-merge A &&

 	: fail because of conflicting untracked file &&
 	>G.t &&
 	echo "merge -C H G" >script-from-scratch &&
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
 	test_must_fail git rebase -ir HEAD &&
 	grep "^merge -C .* G$" .git/rebase-merge/done &&
 	grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
 	test_path_is_file .git/rebase-merge/patch &&

 	: fail because of merge conflict &&
 	rm G.t .git/rebase-merge/patch &&
 	git reset --hard conflicting-G &&
 	test_must_fail git rebase --continue &&
 	! grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
 	test_path_is_file .git/rebase-merge/patch
 '

 test_expect_success 'failed `merge <branch>` does not crash' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout conflicting-G &&

 	echo "merge G" >script-from-scratch &&
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
 	test_must_fail git rebase -ir HEAD &&
 	! grep "^merge G$" .git/rebase-merge/git-rebase-todo &&
 	grep "^Merge branch ${SQ}G${SQ}$" .git/rebase-merge/message
 '

 test_expect_success 'merge -c commits before rewording and reloads todo-list' '
 	cat >script-from-scratch <<-\EOF &&
 	merge -c E B
 	merge -c H G
 	EOF

 	git checkout -b merge-c H &&
 	(
 		set_reword_editor &&
 		GIT_SEQUENCE_EDITOR="\"$PWD/replace-editor.sh\"" \
 			git rebase -i -r D
 	) &&
 	check_reworded_commits E H
 '

 test_expect_success 'merge -c rewords when a strategy is given' '
 	git checkout -b merge-c-with-strategy H &&
 	write_script git-merge-override <<-\EOF &&
 	echo overridden$1 >G.t
 	git add G.t
 	EOF

 	PATH="$PWD:$PATH" \
 	GIT_SEQUENCE_EDITOR="echo merge -c H G >" \
 	GIT_EDITOR="echo edited >>" \
 		git rebase --no-ff -ir -s override -Xxopt E &&
 	test_write_lines overridden--xopt >expect &&
 	test_cmp expect G.t &&
 	test_write_lines H "" edited "" >expect &&
 	git log --format=%B -1 >actual &&
 	test_cmp expect actual

 '
 test_expect_success 'with a branch tip that was cherry-picked already' '
 	git checkout -b already-upstream main &&
 	base="$(git rev-parse --verify HEAD)" &&

 	test_commit A1 &&
 	test_commit A2 &&
 	git reset --hard $base &&
 	test_commit B1 &&
 	test_tick &&
 	git merge -m "Merge branch A" A2 &&

 	git checkout -b upstream-with-a2 $base &&
 	test_tick &&
 	git cherry-pick A2 &&

 	git checkout already-upstream &&
 	test_tick &&
 	git rebase -i -r upstream-with-a2 &&
 	test_cmp_graph upstream-with-a2.. <<-\EOF
 	*   Merge branch A
 	|\
 	| * A1
 	* | B1
 	|/
 	o A2
 	EOF
 '

 test_expect_success 'do not rebase cousins unless asked for' '
 	git checkout -b cousins main &&
 	before="$(git rev-parse --verify HEAD)" &&
 	test_tick &&
 	git rebase -r HEAD^ &&
 	test_cmp_rev HEAD $before &&
 	test_tick &&
 	git rebase --rebase-merges=rebase-cousins HEAD^ &&
 	test_cmp_graph HEAD^.. <<-\EOF
 	*   Merge the topic branch '\''onebranch'\''
 	|\
 	| * D
 	| * G
 	|/
 	o H
 	EOF
 '

 test_expect_success 'refs/rewritten/* is worktree-local' '
 	git worktree add wt &&
 	cat >wt/script-from-scratch <<-\EOF &&
 	label xyz
 	exec GIT_DIR=../.git git rev-parse --verify refs/rewritten/xyz >a || :
 	exec git rev-parse --verify refs/rewritten/xyz >b
 	EOF

 	test_config -C wt sequence.editor \""$PWD"/replace-editor.sh\" &&
 	git -C wt rebase -i HEAD &&
 	test_must_be_empty wt/a &&
 	test_cmp_rev HEAD "$(cat wt/b)"
 '

 test_expect_success '--abort cleans up refs/rewritten' '
 	git checkout -b abort-cleans-refs-rewritten H &&
 	GIT_SEQUENCE_EDITOR="echo break >>" git rebase -ir @^ &&
 	git rev-parse --verify refs/rewritten/onto &&
 	git rebase --abort &&
 	test_must_fail git rev-parse --verify refs/rewritten/onto
 '

 test_expect_success '--quit cleans up refs/rewritten' '
 	git checkout -b quit-cleans-refs-rewritten H &&
 	GIT_SEQUENCE_EDITOR="echo break >>" git rebase -ir @^ &&
 	git rev-parse --verify refs/rewritten/onto &&
 	git rebase --quit &&
 	test_must_fail git rev-parse --verify refs/rewritten/onto
 '

 test_expect_success 'post-rewrite hook and fixups work for merges' '
 	git checkout -b post-rewrite H &&
 	test_commit same1 &&
 	git reset --hard HEAD^ &&
 	test_commit same2 &&
 	git merge -m "to fix up" same1 &&
 	echo same old same old >same2.t &&
 	test_tick &&
 	git commit --fixup HEAD same2.t &&
 	fixup="$(git rev-parse HEAD)" &&

 	mkdir -p .git/hooks &&
 	test_when_finished "rm .git/hooks/post-rewrite" &&
 	echo "cat >actual" | write_script .git/hooks/post-rewrite &&

 	test_tick &&
 	git rebase -i --autosquash -r HEAD^^^ &&
 	printf "%s %s\n%s %s\n%s %s\n%s %s\n" >expect $(git rev-parse \
 		$fixup^^2 HEAD^2 \
 		$fixup^^ HEAD^ \
 		$fixup^ HEAD \
 		$fixup HEAD) &&
 	test_cmp expect actual
 '

 test_expect_success 'refuse to merge ancestors of HEAD' '
 	echo "merge HEAD^" >script-from-scratch &&
 	test_config -C wt sequence.editor \""$PWD"/replace-editor.sh\" &&
 	before="$(git rev-parse HEAD)" &&
 	git rebase -i HEAD &&
 	test_cmp_rev HEAD $before
 '

 test_expect_success 'root commits' '
 	git checkout --orphan unrelated &&
 	(GIT_AUTHOR_NAME="Parsnip" GIT_AUTHOR_EMAIL="root@example.com" \
 	 test_commit second-root) &&
 	test_commit third-root &&
 	cat >script-from-scratch <<-\EOF &&
 	pick third-root
 	label first-branch
 	reset [new root]
 	pick second-root
 	merge first-branch # Merge the 3rd root
 	EOF
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
 	git rebase -i --force-rebase --root -r &&
 	test "Parsnip" = "$(git show -s --format=%an HEAD^)" &&
 	test $(git rev-parse second-root^0) != $(git rev-parse HEAD^) &&
 	test $(git rev-parse second-root:second-root.t) = \
 		$(git rev-parse HEAD^:second-root.t) &&
 	test_cmp_graph HEAD <<-\EOF &&
 	*   Merge the 3rd root
 	|\
 	| * third-root
 	* second-root
 	EOF

 	: fast forward if possible &&
 	before="$(git rev-parse --verify HEAD)" &&
 	test_might_fail git config --unset sequence.editor &&
 	test_tick &&
 	git rebase -i --root -r &&
 	test_cmp_rev HEAD $before
 '

 test_expect_success 'a "merge" into a root commit is a fast-forward' '
 	head=$(git rev-parse HEAD) &&
 	cat >script-from-scratch <<-EOF &&
 	reset [new root]
 	merge $head
 	EOF
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
 	git rebase -i -r HEAD^ &&
 	test_cmp_rev HEAD $head
 '

 test_expect_success 'A root commit can be a cousin, treat it that way' '
 	git checkout --orphan khnum &&
 	test_commit yama &&
 	git checkout -b asherah main &&
 	test_commit shamkat &&
 	git merge --allow-unrelated-histories khnum &&
 	test_tick &&
 	git rebase -f -r HEAD^ &&
 	test_cmp_rev ! HEAD^2 khnum &&
 	test_cmp_graph HEAD^.. <<-\EOF &&
 	*   Merge branch '\''khnum'\'' into asherah
 	|\
 	| * yama
 	o shamkat
 	EOF
 	test_tick &&
 	git rebase --rebase-merges=rebase-cousins HEAD^ &&
 	test_cmp_graph HEAD^.. <<-\EOF
 	*   Merge branch '\''khnum'\'' into asherah
 	|\
 	| * yama
 	|/
 	o shamkat
 	EOF
 '

 test_expect_success 'labels that are object IDs are rewritten' '
 	git checkout -b third B &&
 	test_commit I &&
 	third=$(git rev-parse HEAD) &&
 	git checkout -b labels main &&
 	git merge --no-commit third &&
 	test_tick &&
 	git commit -m "Merge commit '\''$third'\'' into labels" &&
 	echo noop >script-from-scratch &&
 	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
 	test_tick &&
 	git rebase -i -r A &&
 	grep "^label $third-" .git/ORIGINAL-TODO &&
 	! grep "^label $third$" .git/ORIGINAL-TODO
 '

 test_expect_success 'octopus merges' '
 	git checkout -b three &&
 	test_commit before-octopus &&
 	test_commit three &&
 	git checkout -b two HEAD^ &&
 	test_commit two &&
 	git checkout -b one HEAD^ &&
 	test_commit one &&
 	test_tick &&
 	(GIT_AUTHOR_NAME="Hank" GIT_AUTHOR_EMAIL="hank@sea.world" \
 	 git merge -m "Tüntenfüsch" two three) &&

 	: fast forward if possible &&
 	before="$(git rev-parse --verify HEAD)" &&
 	test_tick &&
 	git rebase -i -r HEAD^^ &&
 	test_cmp_rev HEAD $before &&

 	test_tick &&
 	git rebase -i --force-rebase -r HEAD^^ &&
 	test "Hank" = "$(git show -s --format=%an HEAD)" &&
 	test "$before" != $(git rev-parse HEAD) &&
 	test_cmp_graph HEAD^^.. <<-\EOF
 	*-.   Tüntenfüsch
 	|\ \
 	| | * three
 	| * | two
 	| |/
 	* / one
 	|/
 	o before-octopus
 	EOF
 '

 test_expect_success 'with --autosquash and --exec' '
 	git checkout -b with-exec H &&
 	echo Booh >B.t &&
 	test_tick &&
 	git commit --fixup B B.t &&
 	write_script show.sh <<-\EOF &&
 	subject="$(git show -s --format=%s HEAD)"
 	content="$(git diff HEAD^ HEAD | tail -n 1)"
 	echo "$subject: $content"
 	EOF
 	test_tick &&
 	git rebase -ir --autosquash --exec ./show.sh A >actual &&
 	grep "B: +Booh" actual &&
 	grep "E: +Booh" actual &&
 	grep "G: +G" actual
 '

 test_expect_success '--continue after resolving conflicts after a merge' '
 	git checkout -b already-has-g E &&
 	git cherry-pick E..G &&
 	test_commit H2 &&

 	git checkout -b conflicts-in-merge H &&
 	test_commit H2 H2.t conflicts H2-conflict &&
 	test_must_fail git rebase -r already-has-g &&
 	grep conflicts H2.t &&
 	echo resolved >H2.t &&
 	git add -u &&
 	git rebase --continue &&
 	test_must_fail git rev-parse --verify HEAD^2 &&
 	test_path_is_missing .git/MERGE_HEAD
 '

 test_expect_success '--rebase-merges with strategies' '
 	git checkout -b with-a-strategy F &&
 	test_tick &&
 	git merge -m "Merge conflicting-G" conflicting-G &&

 	: first, test with a merge strategy option &&
 	git rebase -ir -Xtheirs G &&
 	echo conflicting-G >expect &&
 	test_cmp expect G.t &&

 	: now, try with a merge strategy other than recursive &&
 	git reset --hard @{1} &&
 	write_script git-merge-override <<-\EOF &&
 	echo overridden$1 >>G.t
 	git add G.t
 	EOF
 	PATH="$PWD:$PATH" git rebase -ir -s override -Xxopt G &&
 	test_write_lines G overridden--xopt >expect &&
 	test_cmp expect G.t
 '

 test_expect_success '--rebase-merges with commit that can generate bad characters for filename' '
 	git checkout -b colon-in-label E &&
 	git merge -m "colon: this should work" G &&
 	git rebase --rebase-merges --force-rebase E
 '

 test_expect_success '--rebase-merges with message matched with onto label' '
 	git checkout -b onto-label E &&
 	git merge -m onto G &&
 	git rebase --rebase-merges --force-rebase E &&
 	test_cmp_graph <<-\EOF
 	*   onto
 	|\
 	| * G
 	| * F
 	* |   E
 	|\ \
 	| * | B
 	* | | D
 	| |/
 	|/|
 	* | C
 	|/
 	* A
 	EOF
 '

 test_done
	#!/bin/sh
	#
	# Copyright (c) 2018 Johannes E. Schindelin
	#

	test_description='git rebase -i --rebase-merges

	This test runs git rebase "interactively", retaining the branch structure by
	recreating merge commits.

	Initial setup:

	-- B -- (first)
	/ \
	A - C - D - E - H (main)
	\ \ /
	\ F - G (second)
	\
	Conflicting-G
	'
	GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
	export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME

	. ./test-lib.sh
	. "$TEST_DIRECTORY"/lib-rebase.sh
	. "$TEST_DIRECTORY"/lib-log-graph.sh

	test_cmp_graph () {
	cat >expect &&
	lib_test_cmp_graph --boundary --format=%s "$@"
	}

	test_expect_success 'setup' '
	write_script replace-editor.sh <<-\EOF &&
	mv "$1" "$(git rev-parse --git-path ORIGINAL-TODO)"
	cp script-from-scratch "$1"
	EOF

	test_commit A &&
	git checkout -b first &&
	test_commit B &&
	b=$(git rev-parse --short HEAD) &&
	git checkout main &&
	test_commit C &&
	c=$(git rev-parse --short HEAD) &&
	test_commit D &&
	d=$(git rev-parse --short HEAD) &&
	git merge --no-commit B &&
	test_tick &&
	git commit -m E &&
	git tag -m E E &&
	e=$(git rev-parse --short HEAD) &&
	git checkout -b second C &&
	test_commit F &&
	f=$(git rev-parse --short HEAD) &&
	test_commit G &&
	g=$(git rev-parse --short HEAD) &&
	git checkout main &&
	git merge --no-commit G &&
	test_tick &&
	git commit -m H &&
	h=$(git rev-parse --short HEAD) &&
	git tag -m H H &&
	git checkout A &&
	test_commit conflicting-G G.t
	'

	test_expect_success 'create completely different structure' '
	cat >script-from-scratch <<-\EOF &&
	label onto

	# onebranch
	pick G
	pick D
	label onebranch

	# second
	reset onto
	pick B
	label second

	reset onto
	merge -C H second
	merge onebranch # Merge the topic branch '\''onebranch'\''
	EOF
	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
	test_tick &&
	git rebase -i -r A main &&
	test_cmp_graph <<-\EOF
	* Merge the topic branch '\''onebranch'\''
	\|\
	\| * D
	\| * G
	* \| H
	\|\ \
	\| \|/
	\|/\|
	\| * B
	\|/
	* A
	EOF
	'

	test_expect_success 'generate correct todo list' '
	cat >expect <<-EOF &&
	label onto

	reset onto
	pick $b B
	label E

	reset onto
	pick $c C
	label branch-point
	pick $f F
	pick $g G
	label H

	reset branch-point # C
	pick $d D
	merge -C $e E # E
	merge -C $h H # H

	EOF

	grep -v "^#" <.git/ORIGINAL-TODO >output &&
	test_cmp expect output
	'

	test_expect_success '`reset` refuses to overwrite untracked files' '
	git checkout -b refuse-to-reset &&
	test_commit dont-overwrite-untracked &&
	git checkout @{-1} &&
	: >dont-overwrite-untracked.t &&
	echo "reset refs/tags/dont-overwrite-untracked" >script-from-scratch &&
	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
	test_must_fail git rebase -ir HEAD &&
	git rebase --abort
	'

	test_expect_success 'failed `merge -C` writes patch (may be rescheduled, too)' '
	test_when_finished "test_might_fail git rebase --abort" &&
	git checkout -b conflicting-merge A &&

	: fail because of conflicting untracked file &&
	>G.t &&
	echo "merge -C H G" >script-from-scratch &&
	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
	test_tick &&
	test_must_fail git rebase -ir HEAD &&
	grep "^merge -C .* G$" .git/rebase-merge/done &&
	grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
	test_path_is_file .git/rebase-merge/patch &&

	: fail because of merge conflict &&
	rm G.t .git/rebase-merge/patch &&
	git reset --hard conflicting-G &&
	test_must_fail git rebase --continue &&
	! grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
	test_path_is_file .git/rebase-merge/patch
	'

	test_expect_success 'failed `merge <branch>` does not crash' '
	test_when_finished "test_might_fail git rebase --abort" &&
	git checkout conflicting-G &&

	echo "merge G" >script-from-scratch &&
	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
	test_tick &&
	test_must_fail git rebase -ir HEAD &&
	! grep "^merge G$" .git/rebase-merge/git-rebase-todo &&
	grep "^Merge branch ${SQ}G${SQ}$" .git/rebase-merge/message
	'

	test_expect_success 'merge -c commits before rewording and reloads todo-list' '
	cat >script-from-scratch <<-\EOF &&
	merge -c E B
	merge -c H G
	EOF

	git checkout -b merge-c H &&
	(
	set_reword_editor &&
	GIT_SEQUENCE_EDITOR="\"$PWD/replace-editor.sh\"" \
	git rebase -i -r D
	) &&
	check_reworded_commits E H
	'

	test_expect_success 'merge -c rewords when a strategy is given' '
	git checkout -b merge-c-with-strategy H &&
	write_script git-merge-override <<-\EOF &&
	echo overridden$1 >G.t
	git add G.t
	EOF

	PATH="$PWD:$PATH" \
	GIT_SEQUENCE_EDITOR="echo merge -c H G >" \
	GIT_EDITOR="echo edited >>" \
	git rebase --no-ff -ir -s override -Xxopt E &&
	test_write_lines overridden--xopt >expect &&
	test_cmp expect G.t &&
	test_write_lines H "" edited "" >expect &&
	git log --format=%B -1 >actual &&
	test_cmp expect actual

	'
	test_expect_success 'with a branch tip that was cherry-picked already' '
	git checkout -b already-upstream main &&
	base="$(git rev-parse --verify HEAD)" &&

	test_commit A1 &&
	test_commit A2 &&
	git reset --hard $base &&
	test_commit B1 &&
	test_tick &&
	git merge -m "Merge branch A" A2 &&

	git checkout -b upstream-with-a2 $base &&
	test_tick &&
	git cherry-pick A2 &&

	git checkout already-upstream &&
	test_tick &&
	git rebase -i -r upstream-with-a2 &&
	test_cmp_graph upstream-with-a2.. <<-\EOF
	* Merge branch A
	\|\
	\| * A1
	* \| B1
	\|/
	o A2
	EOF
	'

	test_expect_success 'do not rebase cousins unless asked for' '
	git checkout -b cousins main &&
	before="$(git rev-parse --verify HEAD)" &&
	test_tick &&
	git rebase -r HEAD^ &&
	test_cmp_rev HEAD $before &&
	test_tick &&
	git rebase --rebase-merges=rebase-cousins HEAD^ &&
	test_cmp_graph HEAD^.. <<-\EOF
	* Merge the topic branch '\''onebranch'\''
	\|\
	\| * D
	\| * G
	\|/
	o H
	EOF
	'

	test_expect_success 'refs/rewritten/* is worktree-local' '
	git worktree add wt &&
	cat >wt/script-from-scratch <<-\EOF &&
	label xyz
	exec GIT_DIR=../.git git rev-parse --verify refs/rewritten/xyz >a \|\| :
	exec git rev-parse --verify refs/rewritten/xyz >b
	EOF

	test_config -C wt sequence.editor \""$PWD"/replace-editor.sh\" &&
	git -C wt rebase -i HEAD &&
	test_must_be_empty wt/a &&
	test_cmp_rev HEAD "$(cat wt/b)"
	'

	test_expect_success '--abort cleans up refs/rewritten' '
	git checkout -b abort-cleans-refs-rewritten H &&
	GIT_SEQUENCE_EDITOR="echo break >>" git rebase -ir @^ &&
	git rev-parse --verify refs/rewritten/onto &&
	git rebase --abort &&
	test_must_fail git rev-parse --verify refs/rewritten/onto
	'

	test_expect_success '--quit cleans up refs/rewritten' '
	git checkout -b quit-cleans-refs-rewritten H &&
	GIT_SEQUENCE_EDITOR="echo break >>" git rebase -ir @^ &&
	git rev-parse --verify refs/rewritten/onto &&
	git rebase --quit &&
	test_must_fail git rev-parse --verify refs/rewritten/onto
	'

	test_expect_success 'post-rewrite hook and fixups work for merges' '
	git checkout -b post-rewrite H &&
	test_commit same1 &&
	git reset --hard HEAD^ &&
	test_commit same2 &&
	git merge -m "to fix up" same1 &&
	echo same old same old >same2.t &&
	test_tick &&
	git commit --fixup HEAD same2.t &&
	fixup="$(git rev-parse HEAD)" &&

	mkdir -p .git/hooks &&
	test_when_finished "rm .git/hooks/post-rewrite" &&
	echo "cat >actual" \| write_script .git/hooks/post-rewrite &&

	test_tick &&
	git rebase -i --autosquash -r HEAD^^^ &&
	printf "%s %s\n%s %s\n%s %s\n%s %s\n" >expect $(git rev-parse \
	$fixup^^2 HEAD^2 \
	$fixup^^ HEAD^ \
	$fixup^ HEAD \
	$fixup HEAD) &&
	test_cmp expect actual
	'

	test_expect_success 'refuse to merge ancestors of HEAD' '
	echo "merge HEAD^" >script-from-scratch &&
	test_config -C wt sequence.editor \""$PWD"/replace-editor.sh\" &&
	before="$(git rev-parse HEAD)" &&
	git rebase -i HEAD &&
	test_cmp_rev HEAD $before
	'

	test_expect_success 'root commits' '
	git checkout --orphan unrelated &&
	(GIT_AUTHOR_NAME="Parsnip" GIT_AUTHOR_EMAIL="root@example.com" \
	test_commit second-root) &&
	test_commit third-root &&
	cat >script-from-scratch <<-\EOF &&
	pick third-root
	label first-branch
	reset [new root]
	pick second-root
	merge first-branch # Merge the 3rd root
	EOF
	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
	test_tick &&
	git rebase -i --force-rebase --root -r &&
	test "Parsnip" = "$(git show -s --format=%an HEAD^)" &&
	test $(git rev-parse second-root^0) != $(git rev-parse HEAD^) &&
	test $(git rev-parse second-root:second-root.t) = \
	$(git rev-parse HEAD^:second-root.t) &&
	test_cmp_graph HEAD <<-\EOF &&
	* Merge the 3rd root
	\|\
	\| * third-root
	* second-root
	EOF

	: fast forward if possible &&
	before="$(git rev-parse --verify HEAD)" &&
	test_might_fail git config --unset sequence.editor &&
	test_tick &&
	git rebase -i --root -r &&
	test_cmp_rev HEAD $before
	'

	test_expect_success 'a "merge" into a root commit is a fast-forward' '
	head=$(git rev-parse HEAD) &&
	cat >script-from-scratch <<-EOF &&
	reset [new root]
	merge $head
	EOF
	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
	test_tick &&
	git rebase -i -r HEAD^ &&
	test_cmp_rev HEAD $head
	'

	test_expect_success 'A root commit can be a cousin, treat it that way' '
	git checkout --orphan khnum &&
	test_commit yama &&
	git checkout -b asherah main &&
	test_commit shamkat &&
	git merge --allow-unrelated-histories khnum &&
	test_tick &&
	git rebase -f -r HEAD^ &&
	test_cmp_rev ! HEAD^2 khnum &&
	test_cmp_graph HEAD^.. <<-\EOF &&
	* Merge branch '\''khnum'\'' into asherah
	\|\
	\| * yama
	o shamkat
	EOF
	test_tick &&
	git rebase --rebase-merges=rebase-cousins HEAD^ &&
	test_cmp_graph HEAD^.. <<-\EOF
	* Merge branch '\''khnum'\'' into asherah
	\|\
	\| * yama
	\|/
	o shamkat
	EOF
	'

	test_expect_success 'labels that are object IDs are rewritten' '
	git checkout -b third B &&
	test_commit I &&
	third=$(git rev-parse HEAD) &&
	git checkout -b labels main &&
	git merge --no-commit third &&
	test_tick &&
	git commit -m "Merge commit '\''$third'\'' into labels" &&
	echo noop >script-from-scratch &&
	test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
	test_tick &&
	git rebase -i -r A &&
	grep "^label $third-" .git/ORIGINAL-TODO &&
	! grep "^label $third$" .git/ORIGINAL-TODO
	'

	test_expect_success 'octopus merges' '
	git checkout -b three &&
	test_commit before-octopus &&
	test_commit three &&
	git checkout -b two HEAD^ &&
	test_commit two &&
	git checkout -b one HEAD^ &&
	test_commit one &&
	test_tick &&
	(GIT_AUTHOR_NAME="Hank" GIT_AUTHOR_EMAIL="hank@sea.world" \
	git merge -m "Tüntenfüsch" two three) &&

	: fast forward if possible &&
	before="$(git rev-parse --verify HEAD)" &&
	test_tick &&
	git rebase -i -r HEAD^^ &&
	test_cmp_rev HEAD $before &&

	test_tick &&
	git rebase -i --force-rebase -r HEAD^^ &&
	test "Hank" = "$(git show -s --format=%an HEAD)" &&
	test "$before" != $(git rev-parse HEAD) &&
	test_cmp_graph HEAD^^.. <<-\EOF
	*-. Tüntenfüsch
	\|\ \
	\| \| * three
	\| * \| two
	\| \|/
	* / one
	\|/
	o before-octopus
	EOF
	'

	test_expect_success 'with --autosquash and --exec' '
	git checkout -b with-exec H &&
	echo Booh >B.t &&
	test_tick &&
	git commit --fixup B B.t &&
	write_script show.sh <<-\EOF &&
	subject="$(git show -s --format=%s HEAD)"
	content="$(git diff HEAD^ HEAD \| tail -n 1)"
	echo "$subject: $content"
	EOF
	test_tick &&
	git rebase -ir --autosquash --exec ./show.sh A >actual &&
	grep "B: +Booh" actual &&
	grep "E: +Booh" actual &&
	grep "G: +G" actual
	'

	test_expect_success '--continue after resolving conflicts after a merge' '
	git checkout -b already-has-g E &&
	git cherry-pick E..G &&
	test_commit H2 &&

	git checkout -b conflicts-in-merge H &&
	test_commit H2 H2.t conflicts H2-conflict &&
	test_must_fail git rebase -r already-has-g &&
	grep conflicts H2.t &&
	echo resolved >H2.t &&
	git add -u &&
	git rebase --continue &&
	test_must_fail git rev-parse --verify HEAD^2 &&
	test_path_is_missing .git/MERGE_HEAD
	'

	test_expect_success '--rebase-merges with strategies' '
	git checkout -b with-a-strategy F &&
	test_tick &&
	git merge -m "Merge conflicting-G" conflicting-G &&

	: first, test with a merge strategy option &&
	git rebase -ir -Xtheirs G &&
	echo conflicting-G >expect &&
	test_cmp expect G.t &&

	: now, try with a merge strategy other than recursive &&
	git reset --hard @{1} &&
	write_script git-merge-override <<-\EOF &&
	echo overridden$1 >>G.t
	git add G.t
	EOF
	PATH="$PWD:$PATH" git rebase -ir -s override -Xxopt G &&
	test_write_lines G overridden--xopt >expect &&
	test_cmp expect G.t
	'

	test_expect_success '--rebase-merges with commit that can generate bad characters for filename' '
	git checkout -b colon-in-label E &&
	git merge -m "colon: this should work" G &&
	git rebase --rebase-merges --force-rebase E
	'

	test_expect_success '--rebase-merges with message matched with onto label' '
	git checkout -b onto-label E &&
	git merge -m onto G &&
	git rebase --rebase-merges --force-rebase E &&
	test_cmp_graph <<-\EOF
	* onto
	\|\
	\| * G
	\| * F
	* \| E
	\|\ \
	\| * \| B
	* \| \| D
	\| \|/
	\|/\|
	* \| C
	\|/
	* A
	EOF
	'

	test_done