Re: What's cooking in git.git (Jan 2025, #06; Wed, 22)

> * tb/unsafe-hash-cleanup (2025-01-17) 8 commits
>  - hash.h: drop unsafe_ function variants
>  - csum-file: introduce hashfile_checkpoint_init()
>  - t/helper/test-hash.c: use unsafe_hash_algo()
>  - csum-file.c: use unsafe_hash_algo()
>  - hash.h: introduce `unsafe_hash_algo()`
>  - csum-file.c: extract algop from hashfile_checksum_valid()
>  - csum-file: store the hash algorithm as a struct field
>  - t/helper/test-tool: implement sha1-unsafe helper
>
>  The API around choosing to use unsafe variant of SHA-1
>  implementation has been updated in an attempt to make it harder to
>  abuse.
>
>  Expecting a hopefully small and final reroll.
>  cf. <20250118124343.GA3828177@coredump.intra.peff.net>
>  source: <cover.1737151386.git.me@ttaylorr.com>

> * tb/incremental-midx-part-2 (2024-11-20) 15 commits
>  - midx: implement writing incremental MIDX bitmaps
>  - pack-bitmap.c: use `ewah_or_iterator` for type bitmap iterators
>  - pack-bitmap.c: keep track of each layer's type bitmaps
>  - ewah: implement `struct ewah_or_iterator`
>  - pack-bitmap.c: apply pseudo-merge commits with incremental MIDXs
>  - pack-bitmap.c: compute disk-usage with incremental MIDXs
>  - pack-bitmap.c: teach `rev-list --test-bitmap` about incremental MIDXs
>  - pack-bitmap.c: support bitmap pack-reuse with incremental MIDXs
>  - pack-bitmap.c: teach `show_objects_for_type()` about incremental MIDXs
>  - pack-bitmap.c: teach `bitmap_for_commit()` about incremental MIDXs
>  - pack-bitmap.c: open and store incremental bitmap layers
>  - pack-revindex: prepare for incremental MIDX bitmaps
>  - Documentation: describe incremental MIDX bitmaps
>  - Merge branch 'tb/pseudo-merge-bitmap-fixes' into tb/incremental-midx-part-2
>  - Merge branch 'tb/incremental-midx-part-1' into tb/incremental-midx-part-2
>
>  Incrementally updating multi-pack index files.
>
>  Needs review.
>  source: <cover.1732054032.git.me@ttaylorr.com>

> * ds/name-hash-tweaks (2024-12-20) 8 commits
>  - pack-objects: add third name hash version
>  - pack-objects: prevent name hash version change
>  - test-tool: add helper for name-hash values
>  - p5313: add size comparison test
>  - pack-objects: add GIT_TEST_NAME_HASH_VERSION
>  - repack: add --name-hash-version option
>  - pack-objects: add --name-hash-version option
>  - pack-objects: create new name-hash function version
>
>  "git pack-objects" and its wrapper "git repack" learned an option
>  to use an alternative path-hash function to improve delta-base
>  selection to produce a packfile with deeper history than window
>  size.
>
>  Will merge to 'next'.
>  (microhalt) <Z5E5KdbwHE7fmiJx@nand.local>
>  source: <pull.1823.v3.git.1734715194.gitgitgadget@gmail.com>