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5e4b029f4a
Trivially shrinks the on-disk size of the index file to save both I/O and checksum overhead. The "v4" format represented here may not be what we eventually want to have, but the preparatory refactoring steps and the way how backward compatibility is retained should give plenty to learn to GSoC student-hopefuls. Will merge to 'next', if nobody objects. * jc/index-v4: update-index: upgrade/downgrade on-disk index version read-cache.c: write prefix-compressed names in the index read-cache.c: read prefix-compressed names in index on-disk version v4 read-cache.c: move code to copy incore to ondisk cache to a helper function read-cache.c: move code to copy ondisk to incore cache to a helper function read-cache.c: report the header version we do not understand read-cache.c: make create_from_disk() report number of bytes it consumed read-cache.c: allow unaligned mapping of the index file cache.h: hide on-disk index details varint: make it available outside the context of pack