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[104.178.186.189]) by smtp.gmail.com with ESMTPSA id s7sm9667095ioc.42.2021.08.31.13.51.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Aug 2021 13:51:34 -0700 (PDT) Date: Tue, 31 Aug 2021 16:51:33 -0400 From: Taylor Blau To: git@vger.kernel.org Cc: peff@peff.net, dstolee@microsoft.com, gitster@pobox.com, jonathantanmy@google.com Subject: [PATCH v5 00/27] multi-pack reachability bitmaps Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Here is another version of the multi-pack reachability bitmaps series. It is virtually unchanged since last time. The changes that did occur is that I integrated Johannes' patch from [1] to fix cleaning up MIDX .rev and .bitmap files when using `--object-dir`. That inspired a lengthy discussion [2] about `--object-dir`, alternates, object-format and running the MIDX builtin outside of a Git repository. This series resolves that discussion by leaving everything as-is, and only changing the following: - `git multi-pack-index` will not run when outside of a Git repository. - The `--object-dir` argument will only recognize object directories belonging to an alternate of the current repository. - Using `--object-dir` to point to a repository which uses a different hash than the repository in the current working directory will continue to not work (as was the case before this series). And because this incorporates [1], we will also not accidentally clean `.rev` files from the wrong object directory. I think that this version is ready-to-go, and that we can turn our attention to squashing some of these cross-alternate buglets, and integrating MIDX bitmaps with `git repack`. [1]: https://lore.kernel.org/git/20210823171011.80588-1-johannes@sipsolutions.net/ [2]: https://lore.kernel.org/git/YSVsHo2wLhnraBnv@nand.local/ Jeff King (2): t0410: disable GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP t5310: disable GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP Taylor Blau (25): pack-bitmap.c: harden 'test_bitmap_walk()' to check type bitmaps pack-bitmap-write.c: gracefully fail to write non-closed bitmaps pack-bitmap-write.c: free existing bitmaps Documentation: describe MIDX-based bitmaps midx: disallow running outside of a repository midx: fix `*.rev` cleanups with `--object-dir` midx: clear auxiliary .rev after replacing the MIDX midx: reject empty `--preferred-pack`'s midx: infer preferred pack when not given one midx: close linked MIDXs, avoid leaking memory midx: avoid opening multiple MIDXs when writing pack-bitmap.c: introduce 'bitmap_num_objects()' pack-bitmap.c: introduce 'nth_bitmap_object_oid()' pack-bitmap.c: introduce 'bitmap_is_preferred_refname()' pack-bitmap.c: avoid redundant calls to try_partial_reuse pack-bitmap: read multi-pack bitmaps pack-bitmap: write multi-pack bitmaps t5310: move some tests to lib-bitmap.sh t/helper/test-read-midx.c: add --checksum mode t5326: test multi-pack bitmap behavior t5319: don't write MIDX bitmaps in t5319 t7700: update to work with MIDX bitmap test knob midx: respect 'GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP' p5310: extract full and partial bitmap tests p5326: perf tests for MIDX bitmaps Documentation/git-multi-pack-index.txt | 20 +- Documentation/technical/bitmap-format.txt | 71 ++- Documentation/technical/multi-pack-index.txt | 10 +- builtin/multi-pack-index.c | 2 + builtin/pack-objects.c | 8 +- builtin/repack.c | 12 +- ci/run-build-and-tests.sh | 1 + git.c | 2 +- midx.c | 328 ++++++++++-- midx.h | 5 + pack-bitmap-write.c | 79 ++- pack-bitmap.c | 499 ++++++++++++++++--- pack-bitmap.h | 9 +- packfile.c | 2 +- t/README | 4 + t/helper/test-read-midx.c | 16 +- t/lib-bitmap.sh | 240 +++++++++ t/perf/lib-bitmap.sh | 69 +++ t/perf/p5310-pack-bitmaps.sh | 65 +-- t/perf/p5326-multi-pack-bitmaps.sh | 43 ++ t/t0410-partial-clone.sh | 12 +- t/t5310-pack-bitmaps.sh | 231 +-------- t/t5319-multi-pack-index.sh | 53 +- t/t5326-multi-pack-bitmaps.sh | 286 +++++++++++ t/t7700-repack.sh | 18 +- 25 files changed, 1644 insertions(+), 441 deletions(-) create mode 100644 t/perf/lib-bitmap.sh create mode 100755 t/perf/p5326-multi-pack-bitmaps.sh create mode 100755 t/t5326-multi-pack-bitmaps.sh Range-diff against v4: 1: 92dc0bbc0d = 1: 7815d9929d pack-bitmap.c: harden 'test_bitmap_walk()' to check type bitmaps 2: 979276bc74 = 2: 629171115a pack-bitmap-write.c: gracefully fail to write non-closed bitmaps 3: 8f00493955 = 3: d469c1d8f6 pack-bitmap-write.c: free existing bitmaps 4: bc7db926d8 = 4: 158ff797c4 Documentation: describe MIDX-based bitmaps -: ---------- > 5: 5f24be8985 midx: disallow running outside of a repository -: ---------- > 6: 0aacaa9283 midx: fix `*.rev` cleanups with `--object-dir` 5: 771741844b ! 7: d30e6fe9a5 midx: clear auxiliary .rev after replacing the MIDX @@ midx.c: static int write_midx_internal(const char *object_dir, struct multi_pack if (flags & MIDX_WRITE_REV_INDEX) write_midx_reverse_index(midx_name, midx_hash, &ctx); -- clear_midx_files_ext(the_repository, ".rev", midx_hash); +- clear_midx_files_ext(object_dir, ".rev", midx_hash); commit_lock_file(&lk); -+ clear_midx_files_ext(the_repository, ".rev", midx_hash); ++ clear_midx_files_ext(object_dir, ".rev", midx_hash); + cleanup: for (i = 0; i < ctx.nr; i++) { 6: dab5dbf228 = 8: db2a24a8ae midx: reject empty `--preferred-pack`'s 7: 31f4517de0 = 9: 059c583e34 midx: infer preferred pack when not given one 8: aa3bd96d9b = 10: 6f5ca446f3 midx: close linked MIDXs, avoid leaking memory 9: c9fea31fa8 ! 11: 4656608f73 midx: avoid opening multiple MIDXs when writing @@ Commit message Signed-off-by: Taylor Blau + ## Documentation/git-multi-pack-index.txt ## +@@ Documentation/git-multi-pack-index.txt: OPTIONS + Use given directory for the location of Git objects. We check + `/packs/multi-pack-index` for the current MIDX file, and + `/packs` for the pack-files to index. +++ ++`` must be an alternate of the current repository. + + --[no-]progress:: + Turn progress on/off explicitly. If neither is specified, progress is + ## midx.c ## @@ midx.c: static int midx_checksum_valid(struct multi_pack_index *m) return hashfile_checksum_valid(m->data, m->data_len); 10: ee72fb7e38 = 12: 4c793df9d1 pack-bitmap.c: introduce 'bitmap_num_objects()' 11: ede0bf1ce1 = 13: 9f165037ce pack-bitmap.c: introduce 'nth_bitmap_object_oid()' 12: df6844def0 = 14: ba5fd71fb3 pack-bitmap.c: introduce 'bitmap_is_preferred_refname()' 13: 4e06f051a7 = 15: 06db8dbbc1 pack-bitmap.c: avoid redundant calls to try_partial_reuse 14: a0d73eb3d3 = 16: 61798853b6 pack-bitmap: read multi-pack bitmaps 15: 9d83ad77ab ! 17: 4968229663 pack-bitmap: write multi-pack bitmaps @@ midx.c: static int write_midx_internal(const char *object_dir, + * corresponding bitmap (or one wasn't requested). + */ + if (!want_bitmap) -+ clear_midx_files_ext(the_repository, ".bitmap", ++ clear_midx_files_ext(object_dir, ".bitmap", + NULL); + goto cleanup; + } @@ midx.c: static int write_midx_internal(const char *object_dir, + } + } + -+ close_object_store(the_repository->objects); ++ if (ctx.m) ++ close_object_store(the_repository->objects); commit_lock_file(&lk); -+ clear_midx_files_ext(the_repository, ".bitmap", midx_hash); - clear_midx_files_ext(the_repository, ".rev", midx_hash); ++ clear_midx_files_ext(object_dir, ".bitmap", midx_hash); + clear_midx_files_ext(object_dir, ".rev", midx_hash); cleanup: @@ midx.c: static int write_midx_internal(const char *object_dir, @@ midx.c: void clear_midx_file(struct repository *r) if (remove_path(midx)) die(_("failed to clear multi-pack-index at %s"), midx); -+ clear_midx_files_ext(r, ".bitmap", NULL); - clear_midx_files_ext(r, ".rev", NULL); ++ clear_midx_files_ext(r->objects->odb->path, ".bitmap", NULL); + clear_midx_files_ext(r->objects->odb->path, ".rev", NULL); free(midx); 16: a92af89884 = 18: 5d60b07e2e t5310: move some tests to lib-bitmap.sh 17: d47aa4a919 = 19: 1a9c3538db t/helper/test-read-midx.c: add --checksum mode 18: 9d9d9f28a6 = 20: 8895114ace t5326: test multi-pack bitmap behavior 19: 3e0da7e5ed = 21: 94b1317e0c t0410: disable GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP 20: 4e0d49a2dd = 22: a4f4d90bba t5310: disable GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP 21: 47eba8ecf9 = 23: 92a6370e77 t5319: don't write MIDX bitmaps in t5319 22: 3d78afa2ad = 24: c49dc46fb2 t7700: update to work with MIDX bitmap test knob 23: c2f94e033d = 25: 44a4800756 midx: respect 'GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP' 24: 6b03016c99 = 26: bf0981b606 p5310: extract full and partial bitmap tests 25: d98faa4c2c = 27: 6888fe01aa p5326: perf tests for MIDX bitmaps -- 2.33.0.96.g73915697e6