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Implement the `write_midx_incremental()` function, which builds and maintains an incremental MIDX chain as part of the geometric repacking process. Unlike the default mode which writes a single flat MIDX, the incremental mode constructs a compaction plan that determines which MIDX layers to write, compact, or copy, and then executes each step using `git multi-pack-index` subcommands with the --checksum-only flag. The repacking strategy works as follows: * Acquire the lock guarding the multi-pack-index-chain. * A new MIDX layer is always written containing the newly created pack(s). If the tip MIDX layer was rewritten during geometric repacking, any surviving packs from that layer are also included. * Starting from the new layer, adjacent MIDX layers are merged together as long as the accumulated object count exceeds half the object count of the next deeper layer (controlled by 'repack.midxSplitFactor'). * Remaining layers in the chain are evaluated pairwise and either compacted or copied as-is, following the same merging condition. * Write the contents of the new multi-pack-index chain, atomically move it into place, and then release the lock. * Delete any now-unused MIDX layers. After writing the new layer, the strategy is evaluated among the existing MIDX layers in order from oldest to newest. Each step that writes a new MIDX layer uses "--checksum-only" to avoid updating the multi-pack-index-chain file. After all steps are complete, the new chain file is written and then atomically moved into place. At present, this functionality is exposed behind a new enum value, `REPACK_WRITE_MIDX_INCREMENTAL`, but has no external callers. A subsequent commit will expose this mode via `git repack --write-midx=incremental`. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Git - fast, scalable, distributed revision control system
Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.
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- stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
- "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
- "goddamn idiotic truckload of sh*t": when it breaks