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index: add a diff test for smudging a file which becomes empty

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Even though the file is empty and thus the size in the entry matches, we
should be able to detect it as a difference.
This commit is contained in:
Carlos Martín Nieto 2015-06-22 14:17:39 +02:00
parent 27133caf3c
commit 6e611f7c3c
1 changed files with 43 additions and 0 deletions
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43
tests/index/racy.c
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@ -98,3 +98,46 @@ void test_index_racy__write_index_just_after_file(void)
git_diff_free(diff);
git_index_free(index);
}
void test_index_racy__empty_file_after_smudge(void)
{
git_index *index;
git_diff *diff;
git_buf path = GIT_BUF_INIT;
int i, found_race = 0;
const git_index_entry *entry;
/* Make sure we do have a timestamp */
cl_git_pass(git_repository_index(&index, g_repo));
cl_git_pass(git_index_write(index));
cl_git_pass(git_buf_joinpath(&path, git_repository_workdir(g_repo), "A"));
/* Make sure writing the file, adding and rewriting happen in the same second */
for (i = 0; i < 10; i++) {
struct stat st;
cl_git_mkfile(path.ptr, "A");
cl_git_pass(git_index_add_bypath(index, "A"));
cl_git_mkfile(path.ptr, "B");
cl_git_pass(git_index_write(index));
cl_git_mkfile(path.ptr, "");
cl_git_pass(p_stat(path.ptr, &st));
cl_assert(entry = git_index_get_bypath(index, "A", 0));
if (entry->mtime.seconds == (int32_t) st.st_mtime) {
found_race = 1;
break;
}
}
if (!found_race)
cl_fail("failed to find race after 10 attempts");
cl_assert_equal_i(0, entry->file_size);
cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
cl_assert_equal_i(1, git_diff_num_deltas(diff));
}