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authorLibravatar Jonathan Tan <jonathantanmy@google.com>2018-10-03 16:04:53 -0700
committerLibravatar Junio C Hamano <gitster@pobox.com>2018-10-04 06:03:49 -0700
commit4c7f9567ea2628451a0f4ad52599a25d34657bae (patch)
tree369478542893baef3d5695698abcb0a272acc006 /t/t5100/patch0012
parentfetch-pack: avoid object flags if no_dependents (diff)
downloadtgif-4c7f9567ea2628451a0f4ad52599a25d34657bae.tar.xz
fetch-pack: exclude blobs when lazy-fetching trees
A partial clone with missing trees can be obtained using "git clone --filter=tree:none <repo>". In such a repository, when a tree needs to be lazily fetched, any tree or blob it directly or indirectly references is fetched as well, regardless of whether the original command required those objects, or if the local repository already had some of them. This is because the fetch protocol, which the lazy fetch uses, does not allow clients to request that only the wanted objects be sent, which would be the ideal solution. This patch implements a partial solution: specify the "blob:none" filter, somewhat reducing the fetch payload. This change has no effect when lazily fetching blobs (due to how filters work). And if lazily fetching a commit (such repositories are difficult to construct and is not a use case we support very well, but it is possible), referenced commits and trees are still fetched - only the blobs are not fetched. The necessary code change is done in fetch_pack() instead of somewhere closer to where the "filter" instruction is written to the wire so that only one part of the code needs to be changed in order for users of all protocol versions to benefit from this optimization. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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