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e379fdf34f
While it makes sense to allow merging unrelated histories of two projects that started independently into one, in the way "gitk" was merged to "git" itself aka "the coolest merge ever", such a merge is still an unusual event. Worse, if somebody creates an independent history by starting from a tarball of an established project and sends a pull request to the original project, "git merge" however happily creates such a merge without any sign of something unusual is happening. Teach "git merge" to refuse to create such a merge by default, unless the user passes a new "--allow-unrelated-histories" option to tell it that the user is aware that two unrelated projects are merged. Because such a "two project merge" is a rare event, a configuration option to always allow such a merge is not added. We could add the same option to "git pull" and have it passed through to underlying "git merge". I do not have a fundamental opposition against such a feature, but this commit does not do so and instead leaves it as low-hanging fruit for others, because such a "two project merge" would be done after fetching the other project into some location in the working tree of an existing project and making sure how well they fit together, it is sufficient to allow a local merge without such an option pass-through from "git pull" to "git merge". Many tests that are updated by this patch does the pass-through manually by turning: git pull something into its equivalent: git fetch something && git merge --allow-unrelated-histories FETCH_HEAD If somebody is inclined to add such an option, updated tests in this change need to be adjusted back to: git pull --allow-unrelated-histories something Signed-off-by: Junio C Hamano <gitster@pobox.com>
281 lines
6.2 KiB
Bash
Executable file
281 lines
6.2 KiB
Bash
Executable file
#!/bin/sh
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test_description='git rebase --root
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Tests if git rebase --root --onto <newparent> can rebase the root commit.
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'
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. ./test-lib.sh
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log_with_names () {
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git rev-list --topo-order --parents --pretty="tformat:%s" HEAD |
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git name-rev --stdin --name-only --refs=refs/heads/$1
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}
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test_expect_success 'prepare repository' '
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test_commit 1 A &&
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test_commit 2 A &&
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git symbolic-ref HEAD refs/heads/other &&
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rm .git/index &&
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test_commit 3 B &&
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test_commit 1b A 1 &&
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test_commit 4 B
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'
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test_expect_success 'rebase --root fails with too many args' '
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git checkout -B fail other &&
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test_must_fail git rebase --onto master --root fail fail
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'
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test_expect_success 'setup pre-rebase hook' '
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mkdir -p .git/hooks &&
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cat >.git/hooks/pre-rebase <<EOF &&
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#!$SHELL_PATH
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echo "\$1,\$2" >.git/PRE-REBASE-INPUT
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EOF
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chmod +x .git/hooks/pre-rebase
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'
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cat > expect <<EOF
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4
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3
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2
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1
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EOF
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test_expect_success 'rebase --root --onto <newbase>' '
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git checkout -b work other &&
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git rebase --root --onto master &&
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git log --pretty=tformat:"%s" > rebased &&
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test_cmp expect rebased
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'
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test_expect_success 'pre-rebase got correct input (1)' '
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test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
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'
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test_expect_success 'rebase --root --onto <newbase> <branch>' '
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git branch work2 other &&
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git rebase --root --onto master work2 &&
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git log --pretty=tformat:"%s" > rebased2 &&
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test_cmp expect rebased2
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'
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test_expect_success 'pre-rebase got correct input (2)' '
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test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work2
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'
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test_expect_success 'rebase -i --root --onto <newbase>' '
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git checkout -b work3 other &&
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git rebase -i --root --onto master &&
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git log --pretty=tformat:"%s" > rebased3 &&
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test_cmp expect rebased3
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'
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test_expect_success 'pre-rebase got correct input (3)' '
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test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
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'
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test_expect_success 'rebase -i --root --onto <newbase> <branch>' '
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git branch work4 other &&
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git rebase -i --root --onto master work4 &&
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git log --pretty=tformat:"%s" > rebased4 &&
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test_cmp expect rebased4
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'
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test_expect_success 'pre-rebase got correct input (4)' '
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test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work4
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'
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test_expect_success 'rebase -i -p with linear history' '
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git checkout -b work5 other &&
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git rebase -i -p --root --onto master &&
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git log --pretty=tformat:"%s" > rebased5 &&
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test_cmp expect rebased5
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'
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test_expect_success 'pre-rebase got correct input (5)' '
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test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
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'
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test_expect_success 'set up merge history' '
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git checkout other^ &&
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git checkout -b side &&
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test_commit 5 C &&
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git checkout other &&
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git merge side
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'
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cat > expect-side <<'EOF'
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commit work6 work6~1 work6^2
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Merge branch 'side' into other
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commit work6^2 work6~2
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5
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commit work6~1 work6~2
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4
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commit work6~2 work6~3
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3
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commit work6~3 work6~4
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2
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commit work6~4
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1
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EOF
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test_expect_success 'rebase -i -p with merge' '
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git checkout -b work6 other &&
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git rebase -i -p --root --onto master &&
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log_with_names work6 > rebased6 &&
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test_cmp expect-side rebased6
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'
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test_expect_success 'set up second root and merge' '
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git symbolic-ref HEAD refs/heads/third &&
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rm .git/index &&
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rm A B C &&
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test_commit 6 D &&
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git checkout other &&
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git merge --allow-unrelated-histories third
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'
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cat > expect-third <<'EOF'
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commit work7 work7~1 work7^2
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Merge branch 'third' into other
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commit work7^2 work7~4
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6
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commit work7~1 work7~2 work7~1^2
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Merge branch 'side' into other
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commit work7~1^2 work7~3
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5
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commit work7~2 work7~3
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4
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commit work7~3 work7~4
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3
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commit work7~4 work7~5
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2
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commit work7~5
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1
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EOF
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test_expect_success 'rebase -i -p with two roots' '
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git checkout -b work7 other &&
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git rebase -i -p --root --onto master &&
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log_with_names work7 > rebased7 &&
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test_cmp expect-third rebased7
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'
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test_expect_success 'setup pre-rebase hook that fails' '
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mkdir -p .git/hooks &&
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cat >.git/hooks/pre-rebase <<EOF &&
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#!$SHELL_PATH
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false
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EOF
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chmod +x .git/hooks/pre-rebase
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'
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test_expect_success 'pre-rebase hook stops rebase' '
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git checkout -b stops1 other &&
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test_must_fail git rebase --root --onto master &&
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test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops1 &&
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test 0 = $(git rev-list other...stops1 | wc -l)
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'
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test_expect_success 'pre-rebase hook stops rebase -i' '
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git checkout -b stops2 other &&
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test_must_fail git rebase --root --onto master &&
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test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops2 &&
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test 0 = $(git rev-list other...stops2 | wc -l)
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'
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test_expect_success 'remove pre-rebase hook' '
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rm -f .git/hooks/pre-rebase
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'
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test_expect_success 'set up a conflict' '
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git checkout master &&
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echo conflict > B &&
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git add B &&
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git commit -m conflict
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'
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test_expect_success 'rebase --root with conflict (first part)' '
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git checkout -b conflict1 other &&
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test_must_fail git rebase --root --onto master &&
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git ls-files -u | grep "B$"
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'
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test_expect_success 'fix the conflict' '
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echo 3 > B &&
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git add B
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'
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cat > expect-conflict <<EOF
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6
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5
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4
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3
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conflict
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2
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1
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EOF
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test_expect_success 'rebase --root with conflict (second part)' '
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git rebase --continue &&
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git log --pretty=tformat:"%s" > conflict1 &&
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test_cmp expect-conflict conflict1
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'
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test_expect_success 'rebase -i --root with conflict (first part)' '
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git checkout -b conflict2 other &&
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test_must_fail git rebase -i --root --onto master &&
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git ls-files -u | grep "B$"
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'
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test_expect_success 'fix the conflict' '
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echo 3 > B &&
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git add B
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'
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test_expect_success 'rebase -i --root with conflict (second part)' '
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git rebase --continue &&
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git log --pretty=tformat:"%s" > conflict2 &&
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test_cmp expect-conflict conflict2
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'
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cat >expect-conflict-p <<\EOF
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commit conflict3 conflict3~1 conflict3^2
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Merge branch 'third' into other
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commit conflict3^2 conflict3~4
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6
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commit conflict3~1 conflict3~2 conflict3~1^2
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Merge branch 'side' into other
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commit conflict3~1^2 conflict3~3
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5
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commit conflict3~2 conflict3~3
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4
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commit conflict3~3 conflict3~4
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3
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commit conflict3~4 conflict3~5
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conflict
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commit conflict3~5 conflict3~6
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2
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commit conflict3~6
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1
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EOF
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test_expect_success 'rebase -i -p --root with conflict (first part)' '
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git checkout -b conflict3 other &&
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test_must_fail git rebase -i -p --root --onto master &&
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git ls-files -u | grep "B$"
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'
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test_expect_success 'fix the conflict' '
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echo 3 > B &&
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git add B
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'
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test_expect_success 'rebase -i -p --root with conflict (second part)' '
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git rebase --continue &&
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log_with_names conflict3 >out &&
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test_cmp expect-conflict-p out
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'
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test_done
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