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cache: add fake_lstat()

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At times, we may already know that a path represented by a
cache_entry ce has no changes via some out-of-line means, like
fsmonitor, and yet need the control to go through a codepath that
requires us to have "struct stat" obtained by lstat() on the path,
for various purposes (e.g. "ie_match_stat()" wants cached stat-info
is still current wrt "struct stat", "diff" wants to know st_mode).

The callers of lstat() on a tracked file, when its cache_entry knows
it is up-to-date, can instead call this helper to pretend that it
called lstat() by faking the "struct stat" information.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2023-09-14 14:46:46 -07:00
parent 43c8a30d15
commit c33fa871a5
4 changed files with 70 additions and 0 deletions
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27
read-cache.c
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@ -197,6 +197,33 @@ void fill_stat_cache_info(struct index_state *istate, struct cache_entry *ce, st
}
}
static unsigned int st_mode_from_ce(const struct cache_entry *ce)
{
extern int trust_executable_bit, has_symlinks;
switch (ce->ce_mode & S_IFMT) {
case S_IFLNK:
return has_symlinks ? S_IFLNK : (S_IFREG | 0644);
case S_IFREG:
return (ce->ce_mode & (trust_executable_bit ? 0755 : 0644)) | S_IFREG;
case S_IFGITLINK:
return S_IFDIR | 0755;
case S_IFDIR:
return ce->ce_mode;
default:
BUG("unsupported ce_mode: %o", ce->ce_mode);
}
}
int fake_lstat(const struct cache_entry *ce, struct stat *st)
{
fake_lstat_data(&ce->ce_stat_data, st);
st->st_mode = st_mode_from_ce(ce);
/* always succeed as lstat() replacement */
return 0;
}
static int ce_compare_data(struct index_state *istate,
const struct cache_entry *ce,
struct stat *st)