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+#!/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 (master)
+ \ \ /
+ \ F - G (second)
+ \
+ Conflicting-G
+'
+. ./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 master &&
+ 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=$(git rev-parse --short HEAD) &&
+ git checkout master &&
+ git merge --no-commit G &&
+ test_tick &&
+ git commit -m H &&
+ h=$(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 master &&
+ 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}$" .git/rebase-merge/message
+'
+
+test_expect_success 'fast-forward merge -c still rewords' '
+ git checkout -b fast-forward-merge-c H &&
+ (
+ set_fake_editor &&
+ FAKE_COMMIT_MESSAGE=edited \
+ GIT_SEQUENCE_EDITOR="echo merge -c H G >" \
+ git rebase -ir @^
+ ) &&
+ echo edited >expected &&
+ git log --pretty=format:%B -1 >actual &&
+ test_cmp expected actual
+'
+
+test_expect_success 'with a branch tip that was cherry-picked already' '
+ git checkout -b already-upstream master &&
+ base="$(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 $base &&
+ test_tick &&
+ git cherry-pick A2 &&
+
+ git checkout already-upstream &&
+ test_tick &&
+ git rebase -i -r upstream-with-a2 &&
+ test_cmp_graph upstream-with-a2.. <<-\EOF
+ * Merge branch A
+ |\
+ | * A1
+ * | B1
+ |/
+ o A2
+ EOF
+'
+
+test_expect_success 'do not rebase cousins unless asked for' '
+ git checkout -b cousins master &&
+ before="$(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 $head
+'
+
+test_expect_success 'A root commit can be a cousin, treat it that way' '
+ git checkout --orphan khnum &&
+ test_commit yama &&
+ git checkout -b asherah master &&
+ test_commit shamkat &&
+ git merge --allow-unrelated-histories khnum &&
+ test_tick &&
+ git rebase -f -r HEAD^ &&
+ test_cmp_rev ! HEAD^2 khnum &&
+ test_cmp_graph HEAD^.. <<-\EOF &&
+ * Merge branch '\''khnum'\'' into asherah
+ |\
+ | * yama
+ o shamkat
+ EOF
+ test_tick &&
+ git rebase --rebase-merges=rebase-cousins HEAD^ &&
+ test_cmp_graph HEAD^.. <<-\EOF
+ * Merge branch '\''khnum'\'' into asherah
+ |\
+ | * yama
+ |/
+ o shamkat
+ EOF
+'
+
+test_expect_success 'labels that are object IDs are rewritten' '
+ git checkout -b third B &&
+ test_commit I &&
+ third=$(git rev-parse HEAD) &&
+ git checkout -b labels master &&
+ 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="$(git diff HEAD^! | tail -n 1)"
+ echo "$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