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diff-lib: fix check_removed when fsmonitor is on 

`git diff-index` may return incorrect deleted entries when fsmonitor
is used in a repository with git submodules. This can be observed on
Mac machines, but it can affect all other supported platforms too.

If fsmonitor is used, `stat *st` is not initialized if cache_entry has
CE_FSMONITOR_VALID set. But, there are three call sites that rely on stat
afterwards, which can result in incorrect results.

This change partially reverts commit 4f3d6d02 (fsmonitor: skip lstat
deletion check during git diff-index, 2021-03-17).

Signed-off-by: Josip Sokcevic <sokcevic@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Josip Sokcevic 2023-09-11 10:09:02 -07:00 committed by Junio C Hamano
parent d27ae36bbb
commit 6a044a2048
2 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
diff-lib.c
View File

@ -28,14 +28,14 @@
* exists for ce that is a submodule -- it is a submodule that is not
* checked out). Return negative for an error.
*/
static int check_removed(const struct index_state *istate, const struct cache_entry *ce, struct stat *st)
static int check_removed(const struct cache_entry *ce, struct stat *st)
{
assert(is_fsmonitor_refreshed(istate));
if (!(ce->ce_flags & CE_FSMONITOR_VALID) && lstat(ce->name, st) < 0) {
if (lstat(ce->name, st) < 0) {
if (!is_missing_file_error(errno))
return -1;
return 1;
}

if (has_symlink_leading_path(ce->name, ce_namelen(ce)))
return 1;
if (S_ISDIR(st->st_mode)) {
@ -141,7 +141,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
memset(&(dpath->parent[0]), 0,
sizeof(struct combine_diff_parent)*5);

changed = check_removed(istate, ce, &st);
changed = check_removed(ce, &st);
if (!changed)
wt_mode = ce_mode_from_stat(ce, st.st_mode);
else {
@ -221,7 +221,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
} else {
struct stat st;

changed = check_removed(istate, ce, &st);
changed = check_removed(ce, &st);
if (changed) {
if (changed < 0) {
perror(ce->name);
@ -296,7 +296,7 @@ static int get_stat_data(const struct index_state *istate,
if (!cached && !ce_uptodate(ce)) {
int changed;
struct stat st;
changed = check_removed(istate, ce, &st);
changed = check_removed(ce, &st);
if (changed < 0)
return -1;
else if (changed) {

5
t/t7527-builtin-fsmonitor.sh
View File

@ -809,6 +809,11 @@ my_match_and_clean () {
status --porcelain=v2 >actual.without &&
test_cmp actual.with actual.without &&

git -C super --no-optional-locks diff-index --name-status HEAD >actual.with &&
git -C super --no-optional-locks -c core.fsmonitor=false \
diff-index --name-status HEAD >actual.without &&
test_cmp actual.with actual.without &&

git -C super/dir_1/dir_2/sub reset --hard &&
git -C super/dir_1/dir_2/sub clean -d -f
}