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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>
184 lines
3.6 KiB
Bash
Executable file
184 lines
3.6 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2007 Junio C Hamano
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#
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test_description='per path merge controlled by merge attribute'
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. ./test-lib.sh
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test_expect_success setup '
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for f in text binary union
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do
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echo Initial >$f && git add $f || return 1
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done &&
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test_tick &&
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git commit -m Initial &&
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git branch side &&
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for f in text binary union
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do
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echo Master >>$f && git add $f || return 1
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done &&
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test_tick &&
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git commit -m Master &&
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git checkout side &&
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for f in text binary union
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do
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echo Side >>$f && git add $f || return 1
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done &&
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test_tick &&
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git commit -m Side &&
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git tag anchor
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'
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test_expect_success merge '
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{
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echo "binary -merge"
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echo "union merge=union"
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} >.gitattributes &&
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if git merge master
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then
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echo Gaah, should have conflicted
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false
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else
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echo Ok, conflicted.
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fi
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'
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test_expect_success 'check merge result in index' '
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git ls-files -u | grep binary &&
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git ls-files -u | grep text &&
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! (git ls-files -u | grep union)
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'
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test_expect_success 'check merge result in working tree' '
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git cat-file -p HEAD:binary >binary-orig &&
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grep "<<<<<<<" text &&
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cmp binary-orig binary &&
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! grep "<<<<<<<" union &&
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grep Master union &&
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grep Side union
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'
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test_expect_success 'retry the merge with longer context' '
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echo text conflict-marker-size=32 >>.gitattributes &&
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git checkout -m text &&
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sed -ne "/^\([<=>]\)\1\1\1*/{
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s/ .*$//
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p
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}" >actual text &&
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grep ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>" actual &&
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grep "================================" actual &&
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grep "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<" actual
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'
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cat >./custom-merge <<\EOF
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#!/bin/sh
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orig="$1" ours="$2" theirs="$3" exit="$4" path=$5
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(
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echo "orig is $orig"
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echo "ours is $ours"
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echo "theirs is $theirs"
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echo "path is $path"
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echo "=== orig ==="
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cat "$orig"
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echo "=== ours ==="
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cat "$ours"
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echo "=== theirs ==="
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cat "$theirs"
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) >"$ours+"
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cat "$ours+" >"$ours"
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rm -f "$ours+"
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exit "$exit"
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EOF
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chmod +x ./custom-merge
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test_expect_success 'custom merge backend' '
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echo "* merge=union" >.gitattributes &&
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echo "text merge=custom" >>.gitattributes &&
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git reset --hard anchor &&
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git config --replace-all \
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merge.custom.driver "./custom-merge %O %A %B 0 %P" &&
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git config --replace-all \
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merge.custom.name "custom merge driver for testing" &&
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git merge master &&
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cmp binary union &&
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sed -e 1,3d text >check-1 &&
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o=$(git unpack-file master^:text) &&
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a=$(git unpack-file side^:text) &&
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b=$(git unpack-file master:text) &&
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sh -c "./custom-merge $o $a $b 0 'text'" &&
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sed -e 1,3d $a >check-2 &&
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cmp check-1 check-2 &&
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rm -f $o $a $b
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'
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test_expect_success 'custom merge backend' '
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git reset --hard anchor &&
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git config --replace-all \
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merge.custom.driver "./custom-merge %O %A %B 1 %P" &&
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git config --replace-all \
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merge.custom.name "custom merge driver for testing" &&
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if git merge master
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then
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echo "Eh? should have conflicted"
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false
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else
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echo "Ok, conflicted"
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fi &&
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cmp binary union &&
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sed -e 1,3d text >check-1 &&
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o=$(git unpack-file master^:text) &&
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a=$(git unpack-file anchor:text) &&
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b=$(git unpack-file master:text) &&
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sh -c "./custom-merge $o $a $b 0 'text'" &&
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sed -e 1,3d $a >check-2 &&
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cmp check-1 check-2 &&
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sed -e 1,3d -e 4q $a >check-3 &&
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echo "path is text" >expect &&
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cmp expect check-3 &&
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rm -f $o $a $b
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'
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test_expect_success 'up-to-date merge without common ancestor' '
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test_create_repo repo1 &&
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test_create_repo repo2 &&
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test_tick &&
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(
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cd repo1 &&
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>a &&
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git add a &&
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git commit -m initial
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) &&
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test_tick &&
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(
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cd repo2 &&
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git commit --allow-empty -m initial
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) &&
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test_tick &&
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(
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cd repo1 &&
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git fetch ../repo2 master &&
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git merge --allow-unrelated-histories FETCH_HEAD
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)
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'
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test_done
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