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authorLibravatar Jonathan Tan <jonathantanmy@google.com>2020-08-17 21:01:34 -0700
committerLibravatar Junio C Hamano <gitster@pobox.com>2020-08-18 13:25:05 -0700
commitabcb7eeb31d0267ada469646be993ad25e127d0d (patch)
tree984cd41c305b201a0190545fc6787c74ee77c7ad /thread-utils.c
parentfetch: avoid reading submodule config until needed (diff)
downloadtgif-abcb7eeb31d0267ada469646be993ad25e127d0d.tar.xz
fetch: only populate existing_refs if needed
In "fetch", get_ref_map() iterates over all refs to populate "existing_refs" in order to populate peer_ref->old_oid in the returned refmap, even if the refmap has no peer_ref set - which is the case when only literal hashes (i.e. no refs by name) are fetched. Iterating over refs causes the targets of those refs to be checked for existence. Avoiding this is especially important when we use "git fetch" to perform lazy fetches in a partial clone because a target of such a ref may need to be itself lazy-fetched (and otherwise causing an infinite loop). Therefore, avoid populating "existing_refs" until necessary. With this patch, because Git lazy-fetches objects by literal hashes (to be done in a subsequent commit), it will then be able to guarantee avoiding reading targets of refs. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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