add_file_to_index: skip rehashing if the cached stat already matches
An earlier commit 366bfcb6 broke git-add by moving read_cache()
call down, because it wanted the directory walking code to grab
paths that are already in the index. The change serves its
purpose, but introduces a regression because the responsibility
of avoiding unnecessary reindexing by matching the cached stat
is shifted nowhere.
This makes it the job of add_file_to_index() function.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/read-cache.c b/read-cache.c
index a363f31..e060392 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -380,7 +380,7 @@
int add_file_to_index(struct index_state *istate, const char *path, int verbose)
{
- int size, namelen;
+ int size, namelen, pos;
struct stat st;
struct cache_entry *ce;
@@ -414,6 +414,15 @@
ce->ce_mode = ce_mode_from_stat(ent, st.st_mode);
}
+ pos = index_name_pos(istate, ce->name, namelen);
+ if (0 <= pos &&
+ !ce_stage(istate->cache[pos]) &&
+ !ie_modified(istate, istate->cache[pos], &st, 1)) {
+ /* Nothing changed, really */
+ free(ce);
+ return 0;
+ }
+
if (index_path(ce->sha1, path, &st, 1))
die("unable to index file %s", path);
if (add_index_entry(istate, ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE))
