git/t/t4069-remerge-diff.sh

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show, log: provide a --remerge-diff capability When this option is specified, we remerge all (two parent) merge commits and diff the actual merge commit to the automatically created version, in order to show how users removed conflict markers, resolved the different conflict versions, and potentially added new changes outside of conflict regions in order to resolve semantic merge problems (or, possibly, just to hide other random changes). This capability works by creating a temporary object directory and marking it as the primary object store. This makes it so that any blobs or trees created during the automatic merge are easily removable afterwards by just deleting all objects from the temporary object directory. There are a few ways that this implementation is suboptimal: * `log --remerge-diff` becomes slow, because the temporary object directory can fill with many loose objects while running * the log output can be muddied with misplaced "warning: cannot merge binary files" messages, since ll-merge.c unconditionally writes those messages to stderr while running instead of allowing callers to manage them. * important conflict and warning messages are simply dropped; thus for conflicts like modify/delete or rename/rename or file/directory which are not representable with content conflict markers, there may be no way for a user of --remerge-diff to know that there had been a conflict which was resolved (and which possibly motivated other changes in the merge commit). * when fixing the previous issue, note that some unimportant conflict and warning messages might start being included. We should instead make sure these remain dropped. Subsequent commits will address these issues. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-02-02 02:37:28 +00:00
#!/bin/sh
test_description='remerge-diff handling'
. ./test-lib.sh
# This test is ort-specific
if test "${GIT_TEST_MERGE_ALGORITHM}" != ort
then
skip_all="GIT_TEST_MERGE_ALGORITHM != ort"
test_done
fi
test_expect_success 'setup basic merges' '
test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
git add numbers &&
git commit -m base &&
git branch feature_a &&
git branch feature_b &&
git branch feature_c &&
git branch ab_resolution &&
git branch bc_resolution &&
git checkout feature_a &&
test_write_lines 1 2 three 4 5 6 7 eight 9 >numbers &&
git commit -a -m change_a &&
git checkout feature_b &&
test_write_lines 1 2 tres 4 5 6 7 8 9 >numbers &&
git commit -a -m change_b &&
git checkout feature_c &&
test_write_lines 1 2 3 4 5 6 7 8 9 10 >numbers &&
git commit -a -m change_c &&
git checkout bc_resolution &&
git merge --ff-only feature_b &&
# no conflict
git merge feature_c &&
git checkout ab_resolution &&
git merge --ff-only feature_a &&
# conflicts!
test_must_fail git merge feature_b &&
# Resolve conflict...and make another change elsewhere
test_write_lines 1 2 drei 4 5 6 7 acht 9 >numbers &&
git add numbers &&
git merge --continue
'
test_expect_success 'remerge-diff on a clean merge' '
git log -1 --oneline bc_resolution >expect &&
git show --oneline --remerge-diff bc_resolution >actual &&
test_cmp expect actual
'
test_expect_success 'remerge-diff on a clean merge with a filter' '
git show --oneline --remerge-diff --diff-filter=U bc_resolution >actual &&
test_must_be_empty actual
'
show, log: provide a --remerge-diff capability When this option is specified, we remerge all (two parent) merge commits and diff the actual merge commit to the automatically created version, in order to show how users removed conflict markers, resolved the different conflict versions, and potentially added new changes outside of conflict regions in order to resolve semantic merge problems (or, possibly, just to hide other random changes). This capability works by creating a temporary object directory and marking it as the primary object store. This makes it so that any blobs or trees created during the automatic merge are easily removable afterwards by just deleting all objects from the temporary object directory. There are a few ways that this implementation is suboptimal: * `log --remerge-diff` becomes slow, because the temporary object directory can fill with many loose objects while running * the log output can be muddied with misplaced "warning: cannot merge binary files" messages, since ll-merge.c unconditionally writes those messages to stderr while running instead of allowing callers to manage them. * important conflict and warning messages are simply dropped; thus for conflicts like modify/delete or rename/rename or file/directory which are not representable with content conflict markers, there may be no way for a user of --remerge-diff to know that there had been a conflict which was resolved (and which possibly motivated other changes in the merge commit). * when fixing the previous issue, note that some unimportant conflict and warning messages might start being included. We should instead make sure these remain dropped. Subsequent commits will address these issues. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-02-02 02:37:28 +00:00
test_expect_success 'remerge-diff with both a resolved conflict and an unrelated change' '
git log -1 --oneline ab_resolution >tmp &&
cat <<-EOF >>tmp &&
diff --git a/numbers b/numbers
remerge CONFLICT (content): Merge conflict in numbers
show, log: provide a --remerge-diff capability When this option is specified, we remerge all (two parent) merge commits and diff the actual merge commit to the automatically created version, in order to show how users removed conflict markers, resolved the different conflict versions, and potentially added new changes outside of conflict regions in order to resolve semantic merge problems (or, possibly, just to hide other random changes). This capability works by creating a temporary object directory and marking it as the primary object store. This makes it so that any blobs or trees created during the automatic merge are easily removable afterwards by just deleting all objects from the temporary object directory. There are a few ways that this implementation is suboptimal: * `log --remerge-diff` becomes slow, because the temporary object directory can fill with many loose objects while running * the log output can be muddied with misplaced "warning: cannot merge binary files" messages, since ll-merge.c unconditionally writes those messages to stderr while running instead of allowing callers to manage them. * important conflict and warning messages are simply dropped; thus for conflicts like modify/delete or rename/rename or file/directory which are not representable with content conflict markers, there may be no way for a user of --remerge-diff to know that there had been a conflict which was resolved (and which possibly motivated other changes in the merge commit). * when fixing the previous issue, note that some unimportant conflict and warning messages might start being included. We should instead make sure these remain dropped. Subsequent commits will address these issues. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-02-02 02:37:28 +00:00
index a1fb731..6875544 100644
--- a/numbers
+++ b/numbers
@@ -1,13 +1,9 @@
1
2
-<<<<<<< b0ed5cb (change_a)
-three
-=======
-tres
->>>>>>> 6cd3f82 (change_b)
+drei
4
5
6
7
-eight
+acht
9
EOF
# Hashes above are sha1; rip them out so test works with sha256
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
git show --oneline --remerge-diff ab_resolution >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
test_expect_success 'pickaxe still includes additional headers for relevant changes' '
# reuses "expect" from the previous testcase
git log --oneline --remerge-diff -Sacht ab_resolution >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
test_expect_success 'can filter out additional headers with pickaxe' '
git show --remerge-diff --submodule=log --find-object=HEAD ab_resolution >actual &&
test_must_be_empty actual &&
git show --remerge-diff -S"not present" --all >actual &&
test_must_be_empty actual
'
test_expect_success 'setup non-content conflicts' '
git switch --orphan base &&
test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
test_write_lines a b c d e f g h i >letters &&
test_write_lines in the way >content &&
git add numbers letters content &&
git commit -m base &&
git branch side1 &&
git branch side2 &&
git checkout side1 &&
test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
git mv letters letters_side1 &&
git mv content file_or_directory &&
git add numbers &&
git commit -m side1 &&
git checkout side2 &&
git rm numbers &&
git mv letters letters_side2 &&
mkdir file_or_directory &&
echo hello >file_or_directory/world &&
git add file_or_directory/world &&
git commit -m side2 &&
git checkout -b resolution side1 &&
test_must_fail git merge side2 &&
test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
git add numbers &&
git add letters_side1 &&
git rm letters &&
git rm letters_side2 &&
git add file_or_directory~HEAD &&
git mv file_or_directory~HEAD wanted_content &&
git commit -m resolved
'
test_expect_success 'remerge-diff with non-content conflicts' '
git log -1 --oneline resolution >tmp &&
cat <<-EOF >>tmp &&
diff --git a/file_or_directory~HASH (side1) b/wanted_content
similarity index 100%
rename from file_or_directory~HASH (side1)
rename to wanted_content
remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
diff --git a/letters b/letters
remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
diff --git a/letters_side2 b/letters_side2
deleted file mode 100644
index b236ae5..0000000
--- a/letters_side2
+++ /dev/null
@@ -1,9 +0,0 @@
-a
-b
-c
-d
-e
-f
-g
-h
-i
diff --git a/numbers b/numbers
remerge CONFLICT (modify/delete): numbers deleted in HASH (side2) and modified in HASH (side1). Version HASH (side1) of numbers left in tree.
EOF
# We still have some sha1 hashes above; rip them out so test works
# with sha256
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
git show --oneline --remerge-diff resolution >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
test_expect_success 'remerge-diff w/ diff-filter=U: all conflict headers, no diff content' '
git log -1 --oneline resolution >tmp &&
cat <<-EOF >>tmp &&
diff --git a/file_or_directory~HASH (side1) b/file_or_directory~HASH (side1)
remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
diff --git a/letters b/letters
remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
diff --git a/numbers b/numbers
remerge CONFLICT (modify/delete): numbers deleted in HASH (side2) and modified in HASH (side1). Version HASH (side1) of numbers left in tree.
EOF
# We still have some sha1 hashes above; rip them out so test works
# with sha256
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
git show --oneline --remerge-diff --diff-filter=U resolution >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
test_expect_success 'submodule formatting ignores additional headers' '
# Reuses "expect" from last testcase
git show --oneline --remerge-diff --diff-filter=U --submodule=log >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
test_expect_success 'remerge-diff w/ diff-filter=R: relevant file + conflict header' '
git log -1 --oneline resolution >tmp &&
cat <<-EOF >>tmp &&
diff --git a/file_or_directory~HASH (side1) b/wanted_content
similarity index 100%
rename from file_or_directory~HASH (side1)
rename to wanted_content
remerge CONFLICT (file/directory): directory in the way of file_or_directory from HASH (side1); moving it to file_or_directory~HASH (side1) instead.
EOF
# We still have some sha1 hashes above; rip them out so test works
# with sha256
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
git show --oneline --remerge-diff --diff-filter=R resolution >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
test_expect_success 'remerge-diff w/ pathspec: limits to relevant file including conflict header' '
git log -1 --oneline resolution >tmp &&
cat <<-EOF >>tmp &&
diff --git a/letters b/letters
remerge CONFLICT (rename/rename): letters renamed to letters_side1 in HASH (side1) and to letters_side2 in HASH (side2).
diff --git a/letters_side2 b/letters_side2
deleted file mode 100644
index b236ae5..0000000
--- a/letters_side2
+++ /dev/null
@@ -1,9 +0,0 @@
-a
-b
-c
-d
-e
-f
-g
-h
-i
EOF
# We still have some sha1 hashes above; rip them out so test works
# with sha256
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
git show --oneline --remerge-diff resolution -- "letters*" >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
test_expect_success 'setup non-content conflicts' '
git switch --orphan newbase &&
test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
git add numbers &&
git commit -m base &&
git branch newside1 &&
git branch newside2 &&
git checkout newside1 &&
test_write_lines 1 2 three 4 5 6 7 8 9 >numbers &&
git add numbers &&
git commit -m side1 &&
git checkout newside2 &&
test_write_lines 1 2 drei 4 5 6 7 8 9 >numbers &&
git add numbers &&
git commit -m side2 &&
git checkout -b newresolution newside1 &&
test_must_fail git merge newside2 &&
git checkout --theirs numbers &&
git add -u numbers &&
git commit -m resolved
'
test_expect_success 'remerge-diff turns off history simplification' '
git log -1 --oneline newresolution >tmp &&
cat <<-EOF >>tmp &&
diff --git a/numbers b/numbers
remerge CONFLICT (content): Merge conflict in numbers
index 070e9e7..5335e78 100644
--- a/numbers
+++ b/numbers
@@ -1,10 +1,6 @@
1
2
-<<<<<<< 96f1e45 (side1)
-three
-=======
drei
->>>>>>> 4fd522f (side2)
4
5
6
EOF
# We still have some sha1 hashes above; rip them out so test works
# with sha256
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
git show --oneline --remerge-diff newresolution -- numbers >tmp &&
sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
test_cmp expect actual
'
show, log: provide a --remerge-diff capability When this option is specified, we remerge all (two parent) merge commits and diff the actual merge commit to the automatically created version, in order to show how users removed conflict markers, resolved the different conflict versions, and potentially added new changes outside of conflict regions in order to resolve semantic merge problems (or, possibly, just to hide other random changes). This capability works by creating a temporary object directory and marking it as the primary object store. This makes it so that any blobs or trees created during the automatic merge are easily removable afterwards by just deleting all objects from the temporary object directory. There are a few ways that this implementation is suboptimal: * `log --remerge-diff` becomes slow, because the temporary object directory can fill with many loose objects while running * the log output can be muddied with misplaced "warning: cannot merge binary files" messages, since ll-merge.c unconditionally writes those messages to stderr while running instead of allowing callers to manage them. * important conflict and warning messages are simply dropped; thus for conflicts like modify/delete or rename/rename or file/directory which are not representable with content conflict markers, there may be no way for a user of --remerge-diff to know that there had been a conflict which was resolved (and which possibly motivated other changes in the merge commit). * when fixing the previous issue, note that some unimportant conflict and warning messages might start being included. We should instead make sure these remain dropped. Subsequent commits will address these issues. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-02-02 02:37:28 +00:00
test_done