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afbdbfae0b
Besides the expected "ref" and "log" records, the reftable library also writes "obj" records. These are basically a reverse mapping of object IDs to their respective ref records so that it becomes efficient to figure out which references point to a specific object. The motivation for this data structure is the "uploadpack.allowTipSHA1InWant" config, which allows a client to fetch any object by its hash that has a ref pointing to it. This reverse index is not used by Git at all though, and the expectation is that most hosters nowadays use "uploadpack.allowAnySHA1InWant". It may thus be preferable for many users to disable writing these optional object indices altogether to safe some precious disk space. Add a new config "reftable.indexObjects" that allows the user to disable the object index altogether. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>