git/t/t3509-cherry-pick-merge-df.sh
Elijah Newren 86273e5764 merge-recursive: D/F conflicts where was_a_dir/file -> was_a_dir
In merge-recursive.c, whenever there was a rename where a file name on one
side of the rename matches a directory name on the other side of the merge,
then the very first check that

  string_list_has_string(&o->current_directory_set, ren1_dst)

would trigger forcing it into marking it as a rename/directory conflict.

However, if the path is only renamed on one side and a simple three-way
merge between the separate files resolves cleanly, then we don't need to
mark it as a rename/directory conflict.  So, we can simply move the check
for rename/directory conflicts after we've verified that there isn't a
rename/rename conflict and that a threeway content merge doesn't work.

This changes the particular error message one gets in the case where the
directory name that a file on one side of the rename matches is not also
part of the rename pair.  For example, with commits containing the files:

  COMMON    -> (HEAD,           MERGE )
  ---------    ---------------  -------
  sub/file1 -> (sub/file1,      newsub)
  <NULL>    -> (newsub/newfile, <NULL>)

then previously when one tried to merge MERGE into HEAD, one would get

  CONFLICT (rename/directory): Rename sub/file1->newsub in HEAD directory newsub added in merge
  Renaming sub/file1 to newsub~HEAD instead
  Adding newsub/newfile
  Automatic merge failed; fix conflicts and then commit the result.
After this patch, the error message will instead become:
  Removing newsub
  Adding newsub/newfile
  CONFLICT (file/directory): There is a directory with name newsub in merge. Adding newsub as newsub~HEAD
  Automatic merge failed; fix conflicts and then commit the result.

That makes more sense to me, because git can't know that there's a conflict
until after it's tried resolving paths involving newsub/newfile to see if
they are still in the way at the end (and if newsub/newfile is not in the
way at the end, there should be no conflict at all, which did not hold with
git previously).

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-09-09 17:03:02 -07:00

101 lines
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Executable file

#!/bin/sh
test_description='Test cherry-pick with directory/file conflicts'
. ./test-lib.sh
test_expect_success SYMLINKS 'Setup rename across paths each below D/F conflicts' '
mkdir a &&
>a/f &&
git add a &&
git commit -m a &&
mkdir b &&
ln -s ../a b/a &&
git add b &&
git commit -m b &&
git checkout -b branch &&
rm b/a &&
mv a b/a &&
ln -s b/a a &&
git add . &&
git commit -m swap &&
>f1 &&
git add f1 &&
git commit -m f1
'
test_expect_success SYMLINKS 'Cherry-pick succeeds with rename across D/F conflicts' '
git reset --hard &&
git checkout master^0 &&
git cherry-pick branch
'
test_expect_success 'Setup rename with file on one side matching directory name on other' '
git checkout --orphan nick-testcase &&
git rm -rf . &&
>empty &&
git add empty &&
git commit -m "Empty file" &&
git checkout -b simple &&
mv empty file &&
mkdir empty &&
mv file empty &&
git add empty/file &&
git commit -m "Empty file under empty dir" &&
echo content >newfile &&
git add newfile &&
git commit -m "New file"
'
test_expect_success 'Cherry-pick succeeds with was_a_dir/file -> was_a_dir (resolve)' '
git reset --hard &&
git checkout -q nick-testcase^0 &&
git cherry-pick --strategy=resolve simple
'
test_expect_success 'Cherry-pick succeeds with was_a_dir/file -> was_a_dir (recursive)' '
git reset --hard &&
git checkout -q nick-testcase^0 &&
git cherry-pick --strategy=recursive simple
'
test_expect_success 'Setup rename with file on one side matching different dirname on other' '
git reset --hard &&
git checkout --orphan mergeme &&
git rm -rf . &&
mkdir sub &&
mkdir othersub &&
echo content > sub/file &&
echo foo > othersub/whatever &&
git add -A &&
git commit -m "Common commmit" &&
git rm -rf othersub &&
git mv sub/file othersub &&
git commit -m "Commit to merge" &&
git checkout -b newhead mergeme~1 &&
>independent-change &&
git add independent-change &&
git commit -m "Completely unrelated change"
'
test_expect_success 'Cherry-pick with rename to different D/F conflict succeeds (resolve)' '
git reset --hard &&
git checkout -q newhead^0 &&
git cherry-pick --strategy=resolve mergeme
'
test_expect_success 'Cherry-pick with rename to different D/F conflict succeeds (recursive)' '
git reset --hard &&
git checkout -q newhead^0 &&
git cherry-pick --strategy=recursive mergeme
'
test_done