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merge-recursive: apply collision handling unification to recursive case

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In the en/merge-path-collision topic (see commit ac193e0e0a, "Merge
branch 'en/merge-path-collision'", 2019-01-04), all the "file collision"
conflict types were modified for consistency.  In particular,
rename/add, rename/rename(2to1) and each rename/add piece of a
rename/rename(1to2)/add[/add] conflict were made to behave like add/add
conflicts have always been handled.

However, this consistency was not enforced when opt->priv->call_depth >
0 for rename/rename conflicts.  Update rename/rename(1to2) and
rename/rename(2to1) conflicts in the recursive case to also be
consistent.  As an added bonus, this simplifies the code considerably.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2020-02-27 00:05:05 +00:00 committed by Junio C Hamano
parent 2d2118b814
commit 802050400a
2 changed files with 77 additions and 114 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

152
merge-recursive.c
View File

@ -1557,35 +1557,6 @@ static int handle_file_collision(struct merge_options *opt,
b, a);
}
/*
* In the recursive case, we just opt to undo renames
*/
if (opt->priv->call_depth && (prev_path1 || prev_path2)) {
/* Put first file (a->oid, a->mode) in its original spot */
if (prev_path1) {
if (update_file(opt, 1, a, prev_path1))
return -1;
} else {
if (update_file(opt, 1, a, collide_path))
return -1;
}
/* Put second file (b->oid, b->mode) in its original spot */
if (prev_path2) {
if (update_file(opt, 1, b, prev_path2))
return -1;
} else {
if (update_file(opt, 1, b, collide_path))
return -1;
}
/* Don't leave something at collision path if unrenaming both */
if (prev_path1 && prev_path2)
remove_file(opt, 1, collide_path, 0);
return 0;
}
/* Remove rename sources if rename/add or rename/rename(2to1) */
if (prev_path1)
remove_file(opt, 1, prev_path1,
@ -1746,85 +1717,56 @@ static int handle_rename_rename_1to2(struct merge_options *opt,
return -1;
free(path_desc);
if (opt->priv->call_depth) {
/*
* FIXME: For rename/add-source conflicts (if we could detect
* such), this is wrong. We should instead find a unique
* pathname and then either rename the add-source file to that
* unique path, or use that unique path instead of src here.
*/
if (update_file(opt, 0, &mfi.blob, o->path))
if (opt->priv->call_depth)
remove_file_from_index(opt->repo->index, o->path);
/*
* For each destination path, we need to see if there is a
* rename/add collision. If not, we can write the file out
* to the specified location.
*/
add = &ci->ren1->dst_entry->stages[flip_stage(2)];
if (is_valid(add)) {
add->path = mfi.blob.path = a->path;
if (handle_file_collision(opt, a->path,
NULL, NULL,
ci->ren1->branch,
ci->ren2->branch,
&mfi.blob, add) < 0)
return -1;
/*
* Above, we put the merged content at the merge-base's
* path. Now we usually need to delete both a->path and
* b->path. However, the rename on each side of the merge
* could also be involved in a rename/add conflict. In
* such cases, we should keep the added file around,
* resolving the conflict at that path in its favor.
*/
add = &ci->ren1->dst_entry->stages[flip_stage(2)];
if (is_valid(add)) {
if (update_file(opt, 0, add, a->path))
return -1;
}
else
remove_file_from_index(opt->repo->index, a->path);
add = &ci->ren2->dst_entry->stages[flip_stage(3)];
if (is_valid(add)) {
if (update_file(opt, 0, add, b->path))
return -1;
}
else
remove_file_from_index(opt->repo->index, b->path);
} else {
/*
* For each destination path, we need to see if there is a
* rename/add collision. If not, we can write the file out
* to the specified location.
*/
add = &ci->ren1->dst_entry->stages[flip_stage(2)];
if (is_valid(add)) {
add->path = mfi.blob.path = a->path;
if (handle_file_collision(opt, a->path,
NULL, NULL,
ci->ren1->branch,
ci->ren2->branch,
&mfi.blob, add) < 0)
return -1;
} else {
char *new_path = find_path_for_conflict(opt, a->path,
ci->ren1->branch,
ci->ren2->branch);
if (update_file(opt, 0, &mfi.blob,
new_path ? new_path : a->path))
return -1;
free(new_path);
if (update_stages(opt, a->path, NULL, a, NULL))
return -1;
}
char *new_path = find_path_for_conflict(opt, a->path,
ci->ren1->branch,
ci->ren2->branch);
if (update_file(opt, 0, &mfi.blob,
new_path ? new_path : a->path))
return -1;
free(new_path);
if (!opt->priv->call_depth &&
update_stages(opt, a->path, NULL, a, NULL))
return -1;
}
add = &ci->ren2->dst_entry->stages[flip_stage(3)];
if (is_valid(add)) {
add->path = mfi.blob.path = b->path;
if (handle_file_collision(opt, b->path,
NULL, NULL,
ci->ren1->branch,
ci->ren2->branch,
add, &mfi.blob) < 0)
return -1;
} else {
char *new_path = find_path_for_conflict(opt, b->path,
ci->ren2->branch,
ci->ren1->branch);
if (update_file(opt, 0, &mfi.blob,
new_path ? new_path : b->path))
return -1;
free(new_path);
if (update_stages(opt, b->path, NULL, NULL, b))
return -1;
}
add = &ci->ren2->dst_entry->stages[flip_stage(3)];
if (is_valid(add)) {
add->path = mfi.blob.path = b->path;
if (handle_file_collision(opt, b->path,
NULL, NULL,
ci->ren1->branch,
ci->ren2->branch,
add, &mfi.blob) < 0)
return -1;
} else {
char *new_path = find_path_for_conflict(opt, b->path,
ci->ren2->branch,
ci->ren1->branch);
if (update_file(opt, 0, &mfi.blob,
new_path ? new_path : b->path))
return -1;
free(new_path);
if (!opt->priv->call_depth &&
update_stages(opt, b->path, NULL, NULL, b))
return -1;
}
return 0;

39
t/t6036-recursive-corner-cases.sh
View File

@ -60,9 +60,9 @@ test_expect_success 'merge simple rename+criss-cross with no modifications' '
test_must_fail git merge -s recursive R2^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
test_line_count = 5 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
@ -133,9 +133,9 @@ test_expect_success 'merge criss-cross + rename merges with basic modification'
test_must_fail git merge -s recursive R2^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
test_line_count = 5 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
@ -218,8 +218,18 @@ test_expect_success 'git detects differently handled merges conflict' '
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
C:new_a D:new_a E:new_a &&
git cat-file -p C:new_a >ours &&
git cat-file -p C:a >theirs &&
>empty &&
test_must_fail git merge-file \
-L "Temporary merge branch 1" \
-L "" \
-L "Temporary merge branch 2" \
ours empty theirs &&
sed -e "s/^\([<=>]\)/\1\1\1/" ours >ours-tweaked &&
git hash-object ours-tweaked >expect &&
git rev-parse >>expect \
D:new_a E:new_a &&
git rev-parse >actual \
:1:new_a :2:new_a :3:new_a &&
test_cmp expect actual &&
@ -257,7 +267,8 @@ test_expect_success 'git detects differently handled merges conflict, swapped' '
ctime=$(git log --no-walk --date=raw --format=%cd C | awk "{print \$1}") &&
newctime=$(($btime+1)) &&
git fast-export --no-data --all | sed -e s/$ctime/$newctime/ | git fast-import --force --quiet &&
# End of differences; rest is copy-paste of last test
# End of most differences; rest is copy-paste of last test,
# other than swapping C:a and C:new_a due to order switch
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
@ -269,8 +280,18 @@ test_expect_success 'git detects differently handled merges conflict, swapped' '
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
C:new_a D:new_a E:new_a &&
git cat-file -p C:a >ours &&
git cat-file -p C:new_a >theirs &&
>empty &&
test_must_fail git merge-file \
-L "Temporary merge branch 1" \
-L "" \
-L "Temporary merge branch 2" \
ours empty theirs &&
sed -e "s/^\([<=>]\)/\1\1\1/" ours >ours-tweaked &&
git hash-object ours-tweaked >expect &&
git rev-parse >>expect \
D:new_a E:new_a &&
git rev-parse >actual \
:1:new_a :2:new_a :3:new_a &&
test_cmp expect actual &&