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Re: [PATCH 0/1] send-pack: set core.warnAmbiguousRefs=false

On 11/6/2018 2:51 PM, Jeff King wrote:
On Tue, Nov 06, 2018 at 02:44:42PM -0500, Jeff King wrote:

The fix for this is simple: set core.warnAmbiguousRefs to false for this
specific call of git pack-objects coming from git send-pack. We don't want
to default it to false for all calls to git pack-objects, as it is valid to
pass ref names instead of object ids. This helps regain these seconds during
a push.
I don't think you actually care about the ambiguity check between refs
here; you just care about avoiding the ref check when we've seen (and
are mostly expecting) a 40-hex sha1. We have a more specific flag for
that: warn_on_object_refname_ambiguity.

And I think it would be OK to enable that all the time for pack-objects,
which is plumbing that does typically expect object names. See prior art
in 25fba78d36 (cat-file: disable object/refname ambiguity check for
batch mode, 2013-07-12) and 4c30d50402 (rev-list: disable object/refname
ambiguity check with --stdin, 2014-03-12).
I'd probably do it here:

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index e50c6cd1ff..d370638a5d 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -3104,6 +3104,7 @@ static void get_object_list(int ac, const char **av)

Scoping the change into get_object_list does make sense. I was doing it a level higher, which is not worth it. I'll reproduce your change here.

  	struct rev_info revs;
  	char line[1000];
  	int flags = 0;
+	int save_warning;
repo_init_revisions(the_repository, &revs, NULL);
  	save_commit_buffer = 0;
@@ -3112,6 +3113,9 @@ static void get_object_list(int ac, const char **av)
  	/* make sure shallows are read */
+ 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')
@@ -3138,6 +3142,8 @@ 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))
But I'll leave it to you to wrap that up in a patch, since you probably
should re-check your timings (which it would be interesting to include
in the commit message, if you have reproducible timings).

The timings change a lot depending on the disk cache and the remote refs, which is unfortunate, but I have measured a three-second improvement.