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Taylor Blau 0855ed966c repack: avoid combining cruft packs with `--max-cruft-size`
In 37dc6d8104 (builtin/repack.c: implement support for
`--max-cruft-size`, 2023-10-02), we exposed new functionality that
allowed repositories to specify the behavior of when we should combine
multiple cruft packs together.

This feature was designed to ensure that we never repacked cruft packs
which were larger than the given threshold in order to provide tighter
I/O bounds for repositories that have many unreachable objects. In
essence, specifying '--max-cruft-size=N' instructed 'repack' to
aggregate cruft packs together (in order of ascending size) until the
combine size grows past 'N', and then make a new cruft pack whose
contents includes the packs we rolled up.

But this isn't quite how it works in practice. Suppose for example that
we have two cruft packs which are each 100MiB in size. One might expect
specifying "--max-cruft-size=200M" would combine these two packs
together, and then avoid repacking them until a pruning GC takes place.
In reality, 'repack' would try and aggregate these together, but writing
a pack that is strictly smaller than 200 MiB (since pack-objects'
"--max-pack-size" provides a strict bound for packs containing more than
one object).

So instead we'll write out a pack that is, say, 199 MiB in size, and
then another 1 MiB pack containing the balance. If we later repack the
repository without adding any new unreachable objects, we'll repeat the
same exercise again, making the same 199 MiB and 1 MiB packs each time.

This happens because of a poor choice to bolt the '--max-cruft-size'
functionality onto pack-objects' '--max-pack-size', forcing us to
generate packs which are always smaller than the provided threshold and
thus subject to repacking.

The following commit will introduce a new flag that implements something
similar to the behavior above. Let's prepare for that by making repack's
'--max-cruft-size' flag behave as an cruft pack-specific override for
'--max-pack-size'.

Do so by temporarily repurposing the 'collapse_small_cruft_packs()'
function to instead generate a cruft pack using the same instructions as
if we didn't specify any maximum pack size. The calling code looks
something like:

    if (args->max_pack_size && !cruft_expiration) {
        collapse_small_cruft_packs(in, args->max_pack_size, existing);
    } else {
        for_each_string_list_item(item, &existing->non_kept_packs)
            fprintf(in, "-%s.pack\n", item->string);
        for_each_string_list_item(item, &existing->cruft_packs)
            fprintf(in, "-%s.pack\n", item->string);
    }

This patch makes collapse_small_cruft_packs() behave identically to the
'else' arm of the conditional above. This repurposing of
'collapse_small_cruft_packs()' is intentional, since it will set us up
nicely to introduce the new behavior in the following commit.

Naturally, there is some test fallout in the test which exercises the
old meaning of '--max-cruft-size'. Mark that test as failing for now to
be dealt with in the following commit. Likewise, add a new test which
explicitly tests the behavior of '--max-cruft-size' to place a hard
limit on the size of any generated cruft pack(s).

Note that this is a breaking change, as it alters the user-visible
behavior of '--max-cruft-size'. But I'm OK changing this behavior in
this instance, since the behavior wasn't accurate to begin with.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Acked-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2025-03-21 03:42:07 -07:00
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SECURITY.md
abspath.c
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add-patch.c
advice.c
advice.h advice.h: *.txt -> *.adoc fixes 2025-03-03 13:49:21 -08:00
alias.c
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alloc.c
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apply.c apply.c: *.txt -> *.adoc fixes 2025-03-03 13:49:22 -08:00
apply.h
archive-tar.c compat/zlib: provide stubs for `deflateSetHeader()` 2025-01-28 13:03:23 -08:00
archive-zip.c
archive.c git-compat-util: move include of "compat/zlib.h" into "git-zlib.h" 2025-01-28 13:03:22 -08:00
archive.h
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banned.h
base85.c
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bisect.c path: drop `git_pathdup()` in favor of `repo_git_path()` 2025-02-07 09:59:22 -08:00
bisect.h
blame.c
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blob.c
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bloom.c
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branch.c worktree: return allocated string from `get_worktree_git_dir()` 2025-02-07 09:59:23 -08:00
branch.h
builtin.h builtin.h: *.txt -> *.adoc fixes 2025-03-03 13:49:22 -08:00
bulk-checkin.c Merge branch 'ps/hash-cleanup' 2025-02-10 10:18:31 -08:00
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bundle-uri.c
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bundle.c bundle: avoid closing file descriptor twice 2025-01-25 18:38:11 -08:00
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cache-tree.c
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chdir-notify.c
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check-builtins.sh
checkout.c
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chunk-format.c
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color.c
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column.c
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combine-diff.c tree-diff: drop list-tail argument to diff_tree_paths() 2025-01-09 12:24:26 -08:00
command-list.txt backfill: add builtin boilerplate 2025-02-03 16:12:41 -08:00
commit-graph.c path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
commit-graph.h
commit-reach.c commit-reach: use `size_t` to track indices when computing merge bases 2024-12-27 08:12:40 -08:00
commit-reach.h commit-reach: use `size_t` to track indices when computing merge bases 2024-12-27 08:12:40 -08:00
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commit.c commit: avoid parent list buildup in clear_commit_marks_many() 2025-02-24 08:51:18 -08:00
commit.h commit-reach: use `size_t` to track indices in `get_reachable_subset()` 2024-12-27 08:11:45 -08:00
common-exit.c common-main: split init and exit code into new files 2025-01-28 14:39:16 -08:00
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csum-file.h hash: stop typedeffing the hash context 2025-01-31 10:06:10 -08:00
ctype.c
daemon.c
date.c date.c: Fix type missmatch warings from msvc 2024-12-26 13:34:28 -08:00
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detect-compiler
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diff-lib.c run_diff_files(): de-mystify the size of combine_diff_path struct 2025-01-09 12:24:24 -08:00
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diff.h diff.h: *.txt -> *.adoc fixes 2025-03-03 13:49:23 -08:00
diffcore-break.c
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diffcore-order.c
diffcore-pickaxe.c
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diffcore-rotate.c
diffcore.h diffcore.h: *.txt -> *.adoc fixes 2025-03-03 13:49:23 -08:00
dir-iterator.c
dir-iterator.h
dir.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
dir.h backfill: add --sparse option 2025-02-03 16:12:42 -08:00
editor.c path: refactor `repo_git_path()` family of functions 2025-02-07 09:59:21 -08:00
editor.h
entry.c
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environment.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
environment.h environment: move access to "core.sharedRepository" into repo settings 2025-02-28 13:54:11 -08:00
exec-cmd.c
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fetch-negotiator.c
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fetch-pack.c Merge branch 'kn/pack-write-with-reduced-globals' 2025-02-03 10:23:34 -08:00
fetch-pack.h
fmt-merge-msg.c
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fsck.c fsck: reject misconfigured fsck.skipList 2025-01-07 09:22:25 -08:00
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fsmonitor--daemon.h
fsmonitor-ipc.c
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fsmonitor-path-utils.h
fsmonitor-settings.c
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fsmonitor.c
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generate-cmdlist.sh doc: use .adoc extension for AsciiDoc files 2025-01-21 12:56:06 -08:00
generate-configlist.sh doc: use .adoc extension for AsciiDoc files 2025-01-21 12:56:06 -08:00
generate-hooklist.sh doc: use .adoc extension for AsciiDoc files 2025-01-21 12:56:06 -08:00
generate-perl.sh
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gettext.c
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git-archimport.perl
git-compat-util.h Merge branch 'ps/zlib-ng' 2025-02-06 14:56:45 -08:00
git-curl-compat.h
git-cvsexportcommit.perl
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git-instaweb.sh instaweb: fix ip binding for the python http.server 2025-01-10 15:27:52 -08:00
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git-send-email.perl
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git-zlib.c git-zlib: cast away potential constness of `next_in` pointer 2025-01-28 13:03:23 -08:00
git-zlib.h git-compat-util: move include of "compat/zlib.h" into "git-zlib.h" 2025-01-28 13:03:22 -08:00
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hash.h hash: provide generic wrappers to update hash contexts 2025-01-31 10:06:11 -08:00
hashmap.c
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help.c Merge branch 'tc/zlib-ng-fix' 2025-03-12 12:06:58 -07:00
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hook.c path: refactor `repo_git_path()` family of functions 2025-02-07 09:59:21 -08:00
hook.h
http-backend.c path: drop `git_pathdup()` in favor of `repo_git_path()` 2025-02-07 09:59:22 -08:00
http-fetch.c
http-push.c global: adapt callers to use generic hash context helpers 2025-01-31 10:06:11 -08:00
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list-objects-filter.c
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lockfile.c
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loose.c path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
loose.h
ls-refs.c
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mailinfo.c
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merge-recursive.c merge-recursive: optimize time complexity for process_renames 2025-02-13 21:33:00 -08:00
merge-recursive.h
merge.c
merge.h
mergesort.h
meson.build meson: fix sorting 2025-03-06 08:35:07 -08:00
meson_options.txt Merge branch 'ps/meson-contrib-bits' 2025-03-03 08:53:03 -08:00
midx-write.c path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
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notes-merge.c path: drop `git_path()` in favor of `repo_git_path()` 2025-02-28 13:54:11 -08:00
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object-name.c object-name.c: *.txt -> *.adoc fixes 2025-03-03 13:49:24 -08:00
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pack-bitmap.c Merge branch 'ps/the-repository' 2025-01-21 08:44:54 -08:00
pack-bitmap.h
pack-check.c global: adapt callers to use generic hash context helpers 2025-01-31 10:06:11 -08:00
pack-mtimes.c
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pack-objects.c
pack-objects.h Merge branch 'ds/name-hash-tweaks' 2025-02-12 10:08:51 -08:00
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pack-write.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
pack.h Merge branch 'kn/pack-write-with-reduced-globals' 2025-02-03 10:23:34 -08:00
packfile.c builtin/pack-objects.c: freshen objects from existing cruft packs 2025-03-13 11:48:04 -07:00
packfile.h builtin/pack-objects.c: freshen objects from existing cruft packs 2025-03-13 11:48:04 -07:00
pager.c
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parallel-checkout.c
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parse-options.c Merge branch 'jc/show-usage-help' 2025-01-28 13:02:22 -08:00
parse-options.h parse-options.h: *.txt -> *.adoc fixes 2025-03-03 13:49:24 -08:00
parse.c
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path-walk.c backfill: add --sparse option 2025-02-03 16:12:42 -08:00
path-walk.h backfill: add --sparse option 2025-02-03 16:12:42 -08:00
path.c path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
path.h path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
pathspec.c
pathspec.h
pkt-line.c
pkt-line.h
preload-index.c
preload-index.h
pretty.c
pretty.h
prio-queue.c
prio-queue.h prio-queue: fix type of `insertion_ctr` 2024-12-27 08:10:41 -08:00
progress.c
progress.h
promisor-remote.c promisor-remote: check advertised name or URL 2025-02-18 11:05:37 -08:00
promisor-remote.h Add 'promisor-remote' capability to protocol v2 2025-02-18 11:05:37 -08:00
prompt.c
prompt.h
protocol-caps.c
protocol-caps.h
protocol.c
protocol.h
prune-packed.c
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pseudo-merge.c
pseudo-merge.h pseudo-merge.h: *.txt -> *.adoc fixes 2025-03-03 13:49:24 -08:00
quote.c
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range-diff.c
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reachable.c worktree: return allocated string from `get_worktree_git_dir()` 2025-02-07 09:59:23 -08:00
reachable.h
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read-cache.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
read-cache.h
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ref-filter.c Merge branch 'rs/ref-fitler-used-atoms-value-fix' 2025-01-29 14:05:09 -08:00
ref-filter.h ref-filter: remove ref_format_clear() 2025-01-21 09:06:24 -08:00
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refs.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
refs.h Merge branch 'tz/doc-txt-to-adoc-fixes' 2025-03-06 14:06:31 -08:00
refspec.c refspec: clarify function naming and documentation 2025-02-18 09:44:27 -08:00
refspec.h refspec: clarify function naming and documentation 2025-02-18 09:44:27 -08:00
remote-curl.c
remote.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
remote.h Merge branch 'tc/clone-single-revision' 2025-02-14 17:53:48 -08:00
replace-object.c
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repo-settings.c environment: move access to "core.sharedRepository" into repo settings 2025-02-28 13:54:11 -08:00
repo-settings.h environment: move access to "core.sharedRepository" into repo settings 2025-02-28 13:54:11 -08:00
repository.c repo-settings: introduce function to clear struct 2025-02-28 13:54:11 -08:00
repository.h
rerere.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
rerere.h rerere: let `rerere_path()` write paths into a caller-provided buffer 2025-02-28 13:54:11 -08:00
reset.c
reset.h
resolve-undo.c
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revision.c worktree: return allocated string from `get_worktree_git_dir()` 2025-02-07 09:59:23 -08:00
revision.h
run-command.c
run-command.h
sane-ctype.h
scalar.c Merge branch 'ps/leakfixes-0129' 2025-02-06 14:56:45 -08:00
send-pack.c send-pack: gracefully close the connection for atomic push 2025-02-03 15:24:58 -08:00
send-pack.h send-pack: new return code "ERROR_SEND_PACK_BAD_REF_STATUS" 2025-02-03 15:24:57 -08:00
sequencer.c rebase -i: reword empty commit after fast-forward 2025-02-11 09:50:53 -08:00
sequencer.h
serve.c Add 'promisor-remote' capability to protocol v2 2025-02-18 11:05:37 -08:00
serve.h
server-info.c path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
server-info.h
setup.c Merge branch 'tz/doc-txt-to-adoc-fixes' 2025-03-06 14:06:31 -08:00
setup.h
sh-i18n--envsubst.c
sha1dc_git.c
sha1dc_git.h
shallow.c path: drop `git_path()` in favor of `repo_git_path()` 2025-02-28 13:54:11 -08:00
shallow.h shallow: fix -Wsign-compare warnings 2024-12-27 08:12:40 -08:00
shared.mak
shell.c
shortlog.h
sideband.c
sideband.h
sigchain.c
sigchain.h
simple-ipc.h simple-ipc.h: *.txt -> *.adoc fixes 2025-03-03 13:49:25 -08:00
sparse-index.c
sparse-index.h
split-index.c
split-index.h
stable-qsort.c
statinfo.c
statinfo.h
strbuf.c Git 2.47.2 2025-01-13 12:55:26 -08:00
strbuf.h Git 2.47.2 2025-01-13 12:55:26 -08:00
streaming.c
streaming.h
string-list.c
string-list.h
strmap.c
strmap.h
strvec.c
strvec.h
sub-process.c
sub-process.h
submodule-config.c
submodule-config.h
submodule.c submodule: refactor `submodule_to_gitdir()` to accept a repo 2025-02-07 09:59:21 -08:00
submodule.h submodule: refactor `submodule_to_gitdir()` to accept a repo 2025-02-07 09:59:21 -08:00
symlinks.c
symlinks.h
tag.c
tag.h
tar.h
tempfile.c path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
tempfile.h
thread-utils.c
thread-utils.h Revert barrier-based LSan threading race workaround 2025-01-01 14:13:01 -08:00
tmp-objdir.c path: adjust last remaining users of `the_repository` 2025-02-28 13:54:11 -08:00
tmp-objdir.h
trace.c
trace.h
trace2.c Merge branch 'am/trace2-with-valueless-true' 2025-01-29 14:05:10 -08:00
trace2.h trace2.h: *.txt -> *.adoc fixes 2025-03-03 13:49:26 -08:00
trailer.c
trailer.h
transport-helper.c
transport-internal.h
transport.c Merge branch 'ps/send-pack-unhide-error-in-atomic-push' 2025-02-18 15:30:32 -08:00
transport.h transport.h: *.txt -> *.adoc fixes 2025-03-03 13:49:27 -08:00
tree-diff.c tree-diff: make list tail-passing more explicit 2025-01-09 12:24:27 -08:00
tree-walk.c
tree-walk.h
tree.c
tree.h
unicode-width.h
unimplemented.sh
unix-socket.c Merge branch 'ps/leakfixes-0129' 2025-02-06 14:56:45 -08:00
unix-socket.h
unix-stream-server.c
unix-stream-server.h
unpack-trees.c unpack-trees.c: *.txt -> *.adoc fixes 2025-03-03 13:49:27 -08:00
unpack-trees.h
upload-pack.c Add 'promisor-remote' capability to protocol v2 2025-02-18 11:05:37 -08:00
upload-pack.h
url.c
url.h
urlmatch.c
urlmatch.h
usage.c usage: add show_usage_if_asked() 2025-01-17 13:30:02 -08:00
userdiff.c
userdiff.h
utf8.c
utf8.h
varint.c
varint.h
version-def.h.in
version.c Merge branch 'ua/os-version-capability' 2025-02-27 15:23:00 -08:00
version.h agent: advertise OS name via agent capability 2025-02-19 09:48:37 -08:00
versioncmp.c
versioncmp.h
walker.c
walker.h
wildmatch.c
wildmatch.h
worktree.c Merge branch 'ps/path-sans-the-repository' 2025-03-05 10:37:43 -08:00
worktree.h worktree: return allocated string from `get_worktree_git_dir()` 2025-02-07 09:59:23 -08:00
wrapper.c wrapper: allow generating insecure random bytes 2025-01-07 09:04:18 -08:00
wrapper.h wrapper: allow generating insecure random bytes 2025-01-07 09:04:18 -08:00
write-or-die.c
write-or-die.h
ws.c
ws.h
wt-status.c path: drop `git_path()` in favor of `repo_git_path()` 2025-02-28 13:54:11 -08:00
wt-status.h
xdiff-interface.c
xdiff-interface.h

README.md

Build status

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.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.adoc to get started, then see Documentation/giteveryday.adoc for a useful minimum set of commands, and Documentation/git-<commandname>.adoc for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

CVS users may also want to read Documentation/gitcvs-migration.adoc (man gitcvs-migration or git help cvs-migration if git is installed).

The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission and Documentation/CodingGuidelines).

Those wishing to help with error message, usage and informational message string translations (localization l10) should see po/README.md (a po file is a Portable Object file that holds the translations).

To subscribe to the list, send an email to git+subscribe@vger.kernel.org (see https://subspace.kernel.org/subscribing.html for details). The mailing list archives are available at https://lore.kernel.org/git/, https://marc.info/?l=git and other archival sites.

Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.

The maintainer frequently sends the "What's cooking" reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.

The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):

  • random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
  • 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