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Junio C Hamano authored
Internaly we use 0{40} as a placeholder object name to signal the codepath that there is no such object (e.g. the fast-forward check while "git fetch" stores a new remote-tracking ref says "we know there is no 'old' thing pointed at by the ref, as we are creating it anew" by passing 0{40} for the 'old' side), and expect that a codepath to locate an in-core object to return NULL as a sign that the object does not exist. A look-up for an object that does not exist however is quite costly with a repository with large number of packfiles. This access pattern has been optimized. * jk/fewer-pack-rescan: sha1_file: fast-path null sha1 as a missing object everything_local: use "quick" object existence check p5551: add a script to test fetch pack-dir rescans t/perf/lib-pack: use fast-import checkpoint to create packs p5550: factor out nonsense-pack creation
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