Re: [PATCH 1/3] t6423: add tests of dual directory rename plus add/add conflict

[Jonathan Tan <jonathantanmy@google.com>]

"Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com> writes:

> From: Elijah Newren <newren@gmail.com>
> 
> This is an attempt at minimalizing a testcase reported by Glen Choo
> with tensorflow where merge-ort would report an assertion failure:
> 
>     Assertion failed: (ci->filemask == 2 || ci->filemask == 4), function apply_directory_rename_modifications, file merge-ort.c, line 2410

First of all, thanks for this fix - I've verified with Glen Choo's test
cases and it does fix it.

> diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh
> index 479db32cd62..296c04f8046 100755
> --- a/t/t6423-merge-rename-directories.sh
> +++ b/t/t6423-merge-rename-directories.sh
> @@ -5199,6 +5199,108 @@ test_expect_success '12k: Directory rename with sibling causes rename-to-self' '
>  	)
>  '
>  
> +# Testcase 12l, Both sides rename a directory into the other side, both add
> +#   a file with after directory renames are the same filename
> +#   Commit O: sub1/file,                 sub2/other
> +#   Commit A: sub3/file,                 sub2/{other, new_add_add_file_1}
> +#   Commit B: sub1/{file, newfile}, sub1/sub2/{other, new_add_add_file_2}
> +#
> +#   In words:
> +#     A: sub1/ -> sub3/, add sub2/new_add_add_file_1
> +#     B: sub2/ -> sub1/sub2, add sub1/newfile, add sub1/sub2/new_add_add_file_2
> +#
> +#   Expected: sub3/{file, newfile, sub2/other}
> +#             CONFLICT (add/add): sub3/sub2/new_add_add_file

The "expected" might need to be updated. After all patches are applied,
this is the tree I get (note that it's "sub1/sub2/new_add_add_file, not
"sub3/sub2/new_add_add_file"):

  .
  |-- sub1
  |   `-- sub2
  |       `-- new_add_add_file
  `-- sub3
      |-- file
      |-- newfile
      `-- sub2
          `-- other

Also, at first glance, "newfile" shouldn't belong in a minimal
reproduction, but it somehow changes the output. When I apply this diff
(to the state after all patches are applied):

  diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh
  index 4286ae987c..9472fb7233 100755
  --- a/t/t6423-merge-rename-directories.sh
  +++ b/t/t6423-merge-rename-directories.sh
  @@ -5237,7 +5237,6 @@ test_setup_12l () {
   
                  git checkout B &&
                  echo dissimilar >sub2/new_add_add_file &&
  -               echo brand >sub1/newfile &&
                  git add sub1 sub2 &&
                  git mv sub2 sub1 &&
                  test_tick &&
  @@ -5255,14 +5254,14 @@ test_expect_merge_algorithm failure success '12l (B into A): Rename into each ot
                  test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 &&
   
                  git ls-files -s >out &&
  -               test_line_count = 5 out &&
  +               test_line_count = 4 out &&
   
                  git rev-parse >actual \
  -                       :0:sub3/file :0:sub3/newfile :0:sub3/sub2/other \
  +                       :0:sub3/file :0:sub3/sub2/other \
                          :2:sub1/sub2/new_add_add_file \
                          :3:sub1/sub2/new_add_add_file &&
                  git rev-parse >expect \
  -                       O:sub1/file  B:sub1/newfile O:sub2/other \
  +                       O:sub1/file  O:sub2/other \
                          A:sub2/new_add_add_file \
                          B:sub1/sub2/new_add_add_file &&
                  test_cmp expect actual &&

I get:

  .
  |-- sub1
  |   `-- sub2
  |       |-- new_add_add_file
  |       `-- other
  `-- sub3
      `-- file

(Note the path to "other".) I haven't figured out what's going on,
though.