f94bfa1516
To show a remerge diff, the merge needs to be recreated. For that to work, the merge base(s) need to be found, which means that the commits' parents have to be traversed until common ancestors are found (if any). However, one optimization that hails all the way back tocb115748ec(Some more memory leak avoidance, 2006-06-17) is to release the commit's list of parents immediately after showing it _and to set that parent list to `NULL`_. This can break the merge base computation. This problem is most obvious when traversing the commits in reverse: In that instance, if a parent of a merge commit has been shown as part of the `git log` command, by the time the merge commit's diff needs to be computed, that parent commit's list of parent commits will have been set to `NULL` and as a result no merge base will be found (even if one should be found). Traversing commits in reverse is far from the only circumstance in which this problem occurs, though. There are many avenues to traversing at least one commit in the revision walk that will later be part of a merge base computation, for example when not even walking any revisions in `git show <merge1> <merge2>` where `<merge1>` is part of the commit graph between the parents of `<merge2>`. Another way to force a scenario where a commit is traversed before it has to be traversed again as part of a merge base computation is to start with two revisions (where the first one is reachable from the second but not in a first-parent ancestry) and show the commit log with `--topo-order` and `--first-parent`. Let's fix this by special-casing the `remerge_diff` mode, similar to what we did with reflogs inf35650dff6(log: do not free parents when walking reflog, 2017-07-07). Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
328 lines
9.2 KiB
Bash
Executable File
328 lines
9.2 KiB
Bash
Executable File
#!/bin/sh
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test_description='remerge-diff handling'
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. ./test-lib.sh
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# This test is ort-specific
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if test "${GIT_TEST_MERGE_ALGORITHM}" != ort
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then
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skip_all="GIT_TEST_MERGE_ALGORITHM != ort"
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test_done
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fi
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test_expect_success 'setup basic merges' '
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test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
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git add numbers &&
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git commit -m base &&
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git branch feature_a &&
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git branch feature_b &&
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git branch feature_c &&
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git branch ab_resolution &&
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git branch bc_resolution &&
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git checkout feature_a &&
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test_write_lines 1 2 three 4 5 6 7 eight 9 >numbers &&
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git commit -a -m change_a &&
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git checkout feature_b &&
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test_write_lines 1 2 tres 4 5 6 7 8 9 >numbers &&
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git commit -a -m change_b &&
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git checkout feature_c &&
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test_write_lines 1 2 3 4 5 6 7 8 9 10 >numbers &&
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git commit -a -m change_c &&
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git checkout bc_resolution &&
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git merge --ff-only feature_b &&
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# no conflict
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git merge feature_c &&
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git checkout ab_resolution &&
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git merge --ff-only feature_a &&
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# conflicts!
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test_must_fail git merge feature_b &&
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# Resolve conflict...and make another change elsewhere
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test_write_lines 1 2 drei 4 5 6 7 acht 9 >numbers &&
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git add numbers &&
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git merge --continue
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'
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test_expect_success 'remerge-diff on a clean merge' '
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git log -1 --oneline bc_resolution >expect &&
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git show --oneline --remerge-diff bc_resolution >actual &&
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test_cmp expect actual
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'
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test_expect_success 'remerge-diff on a clean merge with a filter' '
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git show --oneline --remerge-diff --diff-filter=U bc_resolution >actual &&
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test_must_be_empty actual
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'
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test_expect_success 'remerge-diff with both a resolved conflict and an unrelated change' '
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git log -1 --oneline ab_resolution >tmp &&
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cat <<-EOF >>tmp &&
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diff --git a/numbers b/numbers
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remerge CONFLICT (content): Merge conflict in numbers
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index a1fb731..6875544 100644
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--- a/numbers
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+++ b/numbers
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@@ -1,13 +1,9 @@
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1
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2
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-<<<<<<< b0ed5cb (change_a)
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-three
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-=======
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-tres
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->>>>>>> 6cd3f82 (change_b)
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+drei
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4
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5
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6
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7
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-eight
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+acht
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9
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EOF
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# Hashes above are sha1; rip them out so test works with sha256
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
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git show --oneline --remerge-diff ab_resolution >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'pickaxe still includes additional headers for relevant changes' '
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# reuses "expect" from the previous testcase
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git log --oneline --remerge-diff -Sacht ab_resolution >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'can filter out additional headers with pickaxe' '
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git show --remerge-diff --submodule=log --find-object=HEAD ab_resolution >actual &&
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test_must_be_empty actual &&
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git show --remerge-diff -S"not present" --all >actual &&
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test_must_be_empty actual
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'
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test_expect_success 'setup non-content conflicts' '
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git switch --orphan base &&
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test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
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test_write_lines a b c d e f g h i >letters &&
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test_write_lines in the way >content &&
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git add numbers letters content &&
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git commit -m base &&
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git branch side1 &&
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git branch side2 &&
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git checkout side1 &&
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test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
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git mv letters letters_side1 &&
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git mv content file_or_directory &&
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git add numbers &&
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git commit -m side1 &&
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git checkout side2 &&
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git rm numbers &&
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git mv letters letters_side2 &&
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mkdir file_or_directory &&
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echo hello >file_or_directory/world &&
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git add file_or_directory/world &&
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git commit -m side2 &&
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git checkout -b resolution side1 &&
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test_must_fail git merge side2 &&
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test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
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git add numbers &&
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git add letters_side1 &&
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git rm letters &&
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git rm letters_side2 &&
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git add file_or_directory~HEAD &&
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git mv file_or_directory~HEAD wanted_content &&
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git commit -m resolved
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'
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test_expect_success 'remerge-diff with non-content conflicts' '
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git log -1 --oneline resolution >tmp &&
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cat <<-EOF >>tmp &&
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diff --git a/file_or_directory~HASH (side1) b/wanted_content
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similarity index 100%
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rename from file_or_directory~HASH (side1)
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rename to wanted_content
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remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
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diff --git a/letters b/letters
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remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
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diff --git a/letters_side2 b/letters_side2
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deleted file mode 100644
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index b236ae5..0000000
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--- a/letters_side2
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+++ /dev/null
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@@ -1,9 +0,0 @@
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-a
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-b
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-c
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-d
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-e
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-f
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-g
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-h
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-i
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diff --git a/numbers b/numbers
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remerge CONFLICT (modify/delete): numbers deleted in HASH (side2) and modified in HASH (side1). Version HASH (side1) of numbers left in tree.
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EOF
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# We still have some sha1 hashes above; rip them out so test works
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# with sha256
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
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git show --oneline --remerge-diff resolution >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'remerge-diff w/ diff-filter=U: all conflict headers, no diff content' '
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git log -1 --oneline resolution >tmp &&
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cat <<-EOF >>tmp &&
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diff --git a/file_or_directory~HASH (side1) b/file_or_directory~HASH (side1)
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remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
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diff --git a/letters b/letters
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remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
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diff --git a/numbers b/numbers
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remerge CONFLICT (modify/delete): numbers deleted in HASH (side2) and modified in HASH (side1). Version HASH (side1) of numbers left in tree.
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EOF
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# We still have some sha1 hashes above; rip them out so test works
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# with sha256
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
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git show --oneline --remerge-diff --diff-filter=U resolution >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'submodule formatting ignores additional headers' '
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# Reuses "expect" from last testcase
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git show --oneline --remerge-diff --diff-filter=U --submodule=log >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'remerge-diff w/ diff-filter=R: relevant file + conflict header' '
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git log -1 --oneline resolution >tmp &&
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cat <<-EOF >>tmp &&
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diff --git a/file_or_directory~HASH (side1) b/wanted_content
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similarity index 100%
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rename from file_or_directory~HASH (side1)
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rename to wanted_content
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remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
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EOF
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# We still have some sha1 hashes above; rip them out so test works
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# with sha256
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
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git show --oneline --remerge-diff --diff-filter=R resolution >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'remerge-diff w/ pathspec: limits to relevant file including conflict header' '
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git log -1 --oneline resolution >tmp &&
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cat <<-EOF >>tmp &&
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diff --git a/letters b/letters
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remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
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diff --git a/letters_side2 b/letters_side2
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deleted file mode 100644
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index b236ae5..0000000
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--- a/letters_side2
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+++ /dev/null
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@@ -1,9 +0,0 @@
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-a
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-b
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-c
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-d
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-e
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-f
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-g
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-h
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-i
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EOF
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# We still have some sha1 hashes above; rip them out so test works
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# with sha256
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
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git show --oneline --remerge-diff resolution -- "letters*" >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'setup non-content conflicts' '
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git switch --orphan newbase &&
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test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
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git add numbers &&
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git commit -m base &&
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git branch newside1 &&
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git branch newside2 &&
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git checkout newside1 &&
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test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
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git add numbers &&
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git commit -m side1 &&
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git checkout newside2 &&
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test_write_lines 1 2 drei 4 5 6 7 8 9 >numbers &&
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git add numbers &&
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git commit -m side2 &&
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git checkout -b newresolution newside1 &&
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test_must_fail git merge newside2 &&
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git checkout --theirs numbers &&
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git add -u numbers &&
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git commit -m resolved
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'
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test_expect_success 'remerge-diff turns off history simplification' '
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git log -1 --oneline newresolution >tmp &&
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cat <<-EOF >>tmp &&
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diff --git a/numbers b/numbers
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remerge CONFLICT (content): Merge conflict in numbers
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index 070e9e7..5335e78 100644
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--- a/numbers
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+++ b/numbers
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@@ -1,10 +1,6 @@
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1
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2
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-<<<<<<< 96f1e45 (side1)
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-three
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-=======
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drei
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->>>>>>> 4fd522f (side2)
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4
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5
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6
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EOF
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# We still have some sha1 hashes above; rip them out so test works
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# with sha256
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
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git show --oneline --remerge-diff newresolution -- numbers >tmp &&
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sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
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test_cmp expect actual
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'
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test_expect_success 'remerge-diff with --reverse' '
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git log -1 --remerge-diff --oneline ab_resolution^ >expect &&
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git log -1 --remerge-diff --oneline ab_resolution >>expect &&
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git log -2 --remerge-diff --oneline ab_resolution --reverse >actual &&
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test_cmp expect actual
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'
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test_done
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