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fetch: support hideRefs to speed up connectivity checks

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With roughly 800 remotes all fetching into their own
refs/remotes/$REMOTE/* island, the connectivity check[1] gets
expensive for each fetch on systems which lack sufficient RAM to
cache objects.

To do a no-op fetch on one $REMOTE out of hundreds, hideRefs now
allows the no-op fetch to take ~30 seconds instead of ~20 minutes
on a noisy, RAM-constrained machine (localhost, so no network latency):

   git -c fetch.hideRefs=refs \
	-c fetch.hideRefs='!refs/remotes/$REMOTE/' \
	fetch $REMOTE

[1] `git rev-list --objects --stdin --not --all --quiet --alternate-refs'

Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Wong
2023-02-12 09:04:26 +00:00
committed by Junio C Hamano
parent dadc8e6dac
commit c6ce27ab08
8 changed files with 26 additions and 12 deletions
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3
revision.c
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@ -1574,7 +1574,8 @@ void exclude_hidden_refs(struct ref_exclusions *exclusions, const char *section)
{
struct exclude_hidden_refs_cb cb;
if (strcmp(section, "receive") && strcmp(section, "uploadpack"))
if (strcmp(section, "fetch") && strcmp(section, "receive") &&
strcmp(section, "uploadpack"))
die(_("unsupported section for hidden refs: %s"), section);
if (exclusions->hidden_refs_configured)