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![Johannes Schindelin](/assets/img/avatar_default.png)
When we detect that a `merge` can be skipped because the merged commit is already an ancestor of HEAD, we do not need to commit, therefore writing the MERGE_HEAD file is useless. It is actually worse than useless: a subsequent `git commit` will pick it up and think that we want to merge that commit, still. To avoid that, move the code that writes the MERGE_HEAD file to a location where we already know that the `merge` cannot be skipped. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
416 lines
9.9 KiB
Bash
Executable file
416 lines
9.9 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2018 Johannes E. Schindelin
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#
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test_description='git rebase -i --rebase-merges
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This test runs git rebase "interactively", retaining the branch structure by
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recreating merge commits.
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Initial setup:
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-- B -- (first)
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/ \
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A - C - D - E - H (master)
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\ \ /
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\ F - G (second)
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\
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Conflicting-G
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'
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. ./test-lib.sh
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. "$TEST_DIRECTORY"/lib-rebase.sh
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test_cmp_graph () {
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cat >expect &&
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git log --graph --boundary --format=%s "$@" >output &&
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sed "s/ *$//" <output >output.trimmed &&
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test_cmp expect output.trimmed
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}
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test_expect_success 'setup' '
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write_script replace-editor.sh <<-\EOF &&
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mv "$1" "$(git rev-parse --git-path ORIGINAL-TODO)"
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cp script-from-scratch "$1"
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EOF
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test_commit A &&
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git checkout -b first &&
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test_commit B &&
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git checkout master &&
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test_commit C &&
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test_commit D &&
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git merge --no-commit B &&
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test_tick &&
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git commit -m E &&
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git tag -m E E &&
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git checkout -b second C &&
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test_commit F &&
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test_commit G &&
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git checkout master &&
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git merge --no-commit G &&
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test_tick &&
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git commit -m H &&
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git tag -m H H &&
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git checkout A &&
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test_commit conflicting-G G.t
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'
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test_expect_success 'create completely different structure' '
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cat >script-from-scratch <<-\EOF &&
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label onto
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# onebranch
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pick G
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pick D
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label onebranch
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# second
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reset onto
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pick B
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label second
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reset onto
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merge -C H second
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merge onebranch # Merge the topic branch '\''onebranch'\''
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EOF
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test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
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test_tick &&
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git rebase -i -r A master &&
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test_cmp_graph <<-\EOF
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* Merge the topic branch '\''onebranch'\''
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|\
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| * D
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| * G
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* | H
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|\ \
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| |/
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|/|
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| * B
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|/
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* A
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EOF
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'
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test_expect_success 'generate correct todo list' '
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cat >expect <<-\EOF &&
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label onto
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reset onto
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pick d9df450 B
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label E
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reset onto
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pick 5dee784 C
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label branch-point
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pick ca2c861 F
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pick 088b00a G
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label H
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reset branch-point # C
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pick 12bd07b D
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merge -C 2051b56 E # E
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merge -C 233d48a H # H
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EOF
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grep -v "^#" <.git/ORIGINAL-TODO >output &&
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test_cmp expect output
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'
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test_expect_success '`reset` refuses to overwrite untracked files' '
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git checkout -b refuse-to-reset &&
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test_commit dont-overwrite-untracked &&
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git checkout @{-1} &&
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: >dont-overwrite-untracked.t &&
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echo "reset refs/tags/dont-overwrite-untracked" >script-from-scratch &&
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test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
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test_must_fail git rebase -r HEAD &&
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git rebase --abort
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'
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test_expect_success 'failed `merge -C` writes patch (may be rescheduled, too)' '
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test_when_finished "test_might_fail git rebase --abort" &&
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git checkout -b conflicting-merge A &&
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: fail because of conflicting untracked file &&
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>G.t &&
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echo "merge -C H G" >script-from-scratch &&
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test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
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test_tick &&
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test_must_fail git rebase -ir HEAD &&
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grep "^merge -C .* G$" .git/rebase-merge/done &&
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grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
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test_path_is_file .git/rebase-merge/patch &&
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: fail because of merge conflict &&
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rm G.t .git/rebase-merge/patch &&
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git reset --hard conflicting-G &&
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test_must_fail git rebase --continue &&
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! grep "^merge -C .* G$" .git/rebase-merge/git-rebase-todo &&
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test_path_is_file .git/rebase-merge/patch
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'
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SQ="'"
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test_expect_success 'failed `merge <branch>` does not crash' '
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test_when_finished "test_might_fail git rebase --abort" &&
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git checkout conflicting-G &&
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echo "merge G" >script-from-scratch &&
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test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
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test_tick &&
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test_must_fail git rebase -ir HEAD &&
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! grep "^merge G$" .git/rebase-merge/git-rebase-todo &&
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grep "^Merge branch ${SQ}G${SQ}$" .git/rebase-merge/message
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'
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test_expect_success 'with a branch tip that was cherry-picked already' '
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git checkout -b already-upstream master &&
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base="$(git rev-parse --verify HEAD)" &&
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test_commit A1 &&
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test_commit A2 &&
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git reset --hard $base &&
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test_commit B1 &&
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test_tick &&
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git merge -m "Merge branch A" A2 &&
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git checkout -b upstream-with-a2 $base &&
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test_tick &&
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git cherry-pick A2 &&
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git checkout already-upstream &&
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test_tick &&
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git rebase -i -r upstream-with-a2 &&
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test_cmp_graph upstream-with-a2.. <<-\EOF
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* Merge branch A
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| * A1
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* | B1
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|/
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o A2
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EOF
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'
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test_expect_success 'do not rebase cousins unless asked for' '
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git checkout -b cousins master &&
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before="$(git rev-parse --verify HEAD)" &&
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test_tick &&
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git rebase -r HEAD^ &&
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test_cmp_rev HEAD $before &&
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test_tick &&
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git rebase --rebase-merges=rebase-cousins HEAD^ &&
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test_cmp_graph HEAD^.. <<-\EOF
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* Merge the topic branch '\''onebranch'\''
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|\
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| * D
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| * G
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|/
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o H
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EOF
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'
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test_expect_success 'refs/rewritten/* is worktree-local' '
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git worktree add wt &&
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cat >wt/script-from-scratch <<-\EOF &&
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label xyz
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exec GIT_DIR=../.git git rev-parse --verify refs/rewritten/xyz >a || :
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exec git rev-parse --verify refs/rewritten/xyz >b
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EOF
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test_config -C wt sequence.editor \""$PWD"/replace-editor.sh\" &&
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git -C wt rebase -i HEAD &&
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test_must_be_empty wt/a &&
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test_cmp_rev HEAD "$(cat wt/b)"
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'
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test_expect_success 'post-rewrite hook and fixups work for merges' '
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git checkout -b post-rewrite &&
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test_commit same1 &&
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git reset --hard HEAD^ &&
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test_commit same2 &&
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git merge -m "to fix up" same1 &&
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echo same old same old >same2.t &&
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test_tick &&
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git commit --fixup HEAD same2.t &&
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fixup="$(git rev-parse HEAD)" &&
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mkdir -p .git/hooks &&
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test_when_finished "rm .git/hooks/post-rewrite" &&
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echo "cat >actual" | write_script .git/hooks/post-rewrite &&
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test_tick &&
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git rebase -i --autosquash -r HEAD^^^ &&
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printf "%s %s\n%s %s\n%s %s\n%s %s\n" >expect $(git rev-parse \
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$fixup^^2 HEAD^2 \
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$fixup^^ HEAD^ \
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$fixup^ HEAD \
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$fixup HEAD) &&
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test_cmp expect actual
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'
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test_expect_success 'refuse to merge ancestors of HEAD' '
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echo "merge HEAD^" >script-from-scratch &&
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test_config -C wt sequence.editor \""$PWD"/replace-editor.sh\" &&
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before="$(git rev-parse HEAD)" &&
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git rebase -i HEAD &&
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test_cmp_rev HEAD $before
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'
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test_expect_success 'root commits' '
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git checkout --orphan unrelated &&
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(GIT_AUTHOR_NAME="Parsnip" GIT_AUTHOR_EMAIL="root@example.com" \
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test_commit second-root) &&
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test_commit third-root &&
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cat >script-from-scratch <<-\EOF &&
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pick third-root
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label first-branch
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reset [new root]
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pick second-root
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merge first-branch # Merge the 3rd root
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EOF
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test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
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test_tick &&
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git rebase -i --force --root -r &&
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test "Parsnip" = "$(git show -s --format=%an HEAD^)" &&
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test $(git rev-parse second-root^0) != $(git rev-parse HEAD^) &&
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test $(git rev-parse second-root:second-root.t) = \
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$(git rev-parse HEAD^:second-root.t) &&
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test_cmp_graph HEAD <<-\EOF &&
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* Merge the 3rd root
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| * third-root
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* second-root
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EOF
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: fast forward if possible &&
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before="$(git rev-parse --verify HEAD)" &&
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test_might_fail git config --unset sequence.editor &&
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test_tick &&
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git rebase -i --root -r &&
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test_cmp_rev HEAD $before
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'
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test_expect_success 'a "merge" into a root commit is a fast-forward' '
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head=$(git rev-parse HEAD) &&
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cat >script-from-scratch <<-EOF &&
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reset [new root]
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merge $head
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EOF
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test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
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test_tick &&
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git rebase -i -r HEAD^ &&
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test_cmp_rev HEAD $head
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'
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test_expect_success 'A root commit can be a cousin, treat it that way' '
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git checkout --orphan khnum &&
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test_commit yama &&
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git checkout -b asherah master &&
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test_commit shamkat &&
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git merge --allow-unrelated-histories khnum &&
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test_tick &&
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git rebase -f -r HEAD^ &&
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! test_cmp_rev HEAD^2 khnum &&
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test_cmp_graph HEAD^.. <<-\EOF &&
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* Merge branch '\''khnum'\'' into asherah
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| * yama
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o shamkat
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EOF
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test_tick &&
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git rebase --rebase-merges=rebase-cousins HEAD^ &&
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test_cmp_graph HEAD^.. <<-\EOF
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* Merge branch '\''khnum'\'' into asherah
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| * yama
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|/
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o shamkat
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EOF
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'
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test_expect_success 'labels that are object IDs are rewritten' '
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git checkout -b third B &&
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test_commit I &&
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third=$(git rev-parse HEAD) &&
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git checkout -b labels master &&
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git merge --no-commit third &&
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test_tick &&
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git commit -m "Merge commit '\''$third'\'' into labels" &&
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echo noop >script-from-scratch &&
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test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
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test_tick &&
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git rebase -i -r A &&
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grep "^label $third-" .git/ORIGINAL-TODO &&
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! grep "^label $third$" .git/ORIGINAL-TODO
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'
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test_expect_success 'octopus merges' '
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git checkout -b three &&
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test_commit before-octopus &&
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test_commit three &&
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git checkout -b two HEAD^ &&
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test_commit two &&
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git checkout -b one HEAD^ &&
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test_commit one &&
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test_tick &&
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(GIT_AUTHOR_NAME="Hank" GIT_AUTHOR_EMAIL="hank@sea.world" \
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git merge -m "Tüntenfüsch" two three) &&
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: fast forward if possible &&
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before="$(git rev-parse --verify HEAD)" &&
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test_tick &&
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git rebase -i -r HEAD^^ &&
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test_cmp_rev HEAD $before &&
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test_tick &&
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git rebase -i --force -r HEAD^^ &&
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test "Hank" = "$(git show -s --format=%an HEAD)" &&
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test "$before" != $(git rev-parse HEAD) &&
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test_cmp_graph HEAD^^.. <<-\EOF
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*-. Tüntenfüsch
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|\ \
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| | * three
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| * | two
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* | one
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|/
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o before-octopus
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EOF
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'
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test_expect_success 'with --autosquash and --exec' '
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git checkout -b with-exec H &&
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echo Booh >B.t &&
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test_tick &&
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git commit --fixup B B.t &&
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write_script show.sh <<-\EOF &&
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subject="$(git show -s --format=%s HEAD)"
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content="$(git diff HEAD^! | tail -n 1)"
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echo "$subject: $content"
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EOF
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test_tick &&
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git rebase -ir --autosquash --exec ./show.sh A >actual &&
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grep "B: +Booh" actual &&
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grep "E: +Booh" actual &&
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grep "G: +G" actual
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'
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test_expect_success '--continue after resolving conflicts after a merge' '
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git checkout -b already-has-g E &&
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git cherry-pick E..G &&
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test_commit H2 &&
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git checkout -b conflicts-in-merge H &&
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test_commit H2 H2.t conflicts H2-conflict &&
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test_must_fail git rebase -r already-has-g &&
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grep conflicts H2.t &&
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echo resolved >H2.t &&
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git add -u &&
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git rebase --continue &&
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test_must_fail git rev-parse --verify HEAD^2 &&
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test_path_is_missing .git/MERGE_HEAD
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'
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test_done
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