From c33fa871a5c89091cfc89fd7b6ef504d2d48bef2 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Thu, 14 Sep 2023 14:46:46 -0700 Subject: cache: add fake_lstat() 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 --- read-cache.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'read-cache.c') diff --git a/read-cache.c b/read-cache.c index 080bd39713..eb750e2e49 100644 --- a/read-cache.c +++ b/read-cache.c @@ -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) -- cgit v1.3