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pack-objects: ignore ambiguous object warnings

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A git push process runs several processes during its run, but one
includes git send-pack which calls git pack-objects and passes
the known have/wants into stdin using object ids. However, the
default setting for core.warnAmbiguousRefs requires git pack-objects
to check for ref names matching the ref_rev_parse_rules array in
refs.c. This means that every object is triggering at least six
"file exists?" queries.  When there are a lot of refs, this can
add up significantly! I observed a simple push spending three
seconds checking these paths.

The fix here is similar to 4c30d50 "rev-list: disable object/refname
ambiguity check with --stdin".  While the get_object_list() method
reads the objects from stdin, turn warn_on_object_refname_ambiguity
flag (which is usually true) to false.  Just for code hygiene, save
away the original at the beginning and restore it once we are done.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2018-11-06 12:34:47 -08:00 committed by Junio C Hamano
parent cae598d998
commit a4544b311e
1 changed files with 6 additions and 0 deletions
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6
builtin/pack-objects.c
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@ -2988,6 +2988,7 @@ static void get_object_list(int ac, const char **av)
struct rev_info revs;
char line[1000];
int flags = 0;
int save_warning;
init_revisions(&revs, NULL);
save_commit_buffer = 0;
@ -2996,6 +2997,9 @@ static void get_object_list(int ac, const char **av)
/* make sure shallows are read */
is_repository_shallow(the_repository);
save_warning = warn_on_object_refname_ambiguity;
warn_on_object_refname_ambiguity = 0;
while (fgets(line, sizeof(line), stdin) != NULL) {
int len = strlen(line);
if (len && line[len - 1] == '\n')
@ -3022,6 +3026,8 @@ static void get_object_list(int ac, const char **av)
die(_("bad revision '%s'"), line);
}
warn_on_object_refname_ambiguity = save_warning;
if (use_bitmap_index && !get_object_list_from_bitmap(&revs))
return;