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Taylor Blau b80236d0e3 midx: support reading incremental MIDX chains
Now that the MIDX machinery's internals have been taught to understand
incremental MIDXs over the previous handful of commits, the MIDX
machinery itself can begin reading incremental MIDXs.

(Note that while the on-disk format for incremental MIDXs has been
defined, the writing end has not been implemented. This will take place
in the commit after next.)

The core of this change involves following the order specified in the
MIDX chain in reverse and opening up MIDXs in the chain one-by-one,
adding them to the previous layer's `->base_midx` pointer at each step.

In order to implement this, the `load_multi_pack_index()` function is
taught to call a new `load_multi_pack_index_chain()` function if loading
a non-incremental MIDX failed via `load_multi_pack_index_one()`.

When loading a MIDX chain, `load_midx_chain_fd_st()` reads each line in
the file one-by-one and dispatches calls to
`load_multi_pack_index_one()` to read each layer of the MIDX chain. When
a layer was successfully read, it is added to the MIDX chain by calling
`add_midx_to_chain()` which validates the contents of the `BASE` chunk,
performs some bounds checks on the number of combined packs and objects,
and attaches the new MIDX by assigning its `base_midx` pointer to the
existing part of the chain.

As a supplement to this, introduce a new mode in the test-read-midx
test-tool which allows us to read the information for a specific MIDX in
the chain by specifying its trailing checksum via the command-line
arguments like so:

    $ test-tool read-midx .git/objects [checksum]

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2024-08-06 12:01:38 -07:00
.github Merge branch 'fixes/2.45.1/2.44' into jc/fix-2.45.1-and-friends-for-maint 2024-05-24 16:59:12 -07:00
Documentation Documentation: describe incremental MIDX format 2024-08-06 12:01:35 -07:00
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builtin Merge branch 'as/describe-broken-refresh-index-fix' 2024-07-15 10:11:40 -07:00
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contrib Merge branch 'kn/osxkeychain-skip-idempotent-store' 2024-05-28 11:17:11 -07:00
ewah ewah: `bitmap_equals_ewah()` 2024-05-24 11:40:44 -07:00
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mergetools Switch grep from non-portable BRE to portable ERE 2024-05-17 12:13:18 -07:00
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t midx: support reading incremental MIDX chains 2024-08-06 12:01:38 -07:00
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COPYING
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README.md git-gui: note the new maintainer 2024-05-11 17:22:17 +02:00
RelNotes More post 2.45.2 updates from the 'master' front 2024-06-28 15:53:19 -07:00
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environment.h config: clarify memory ownership in `git_config_string()` 2024-05-27 11:20:00 -07:00
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git.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
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hash-lookup.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
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help.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
help.h builtin/merge: fix leaking `struct cmdnames` in `get_strategy()` 2024-06-11 13:15:07 -07:00
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mailmap.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
mailmap.h config: clarify memory ownership in `git_config_string()` 2024-05-27 11:20:00 -07:00
match-trees.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
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merge-blobs.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
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merge-recursive.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
merge-recursive.h merge: fix leaking merge bases 2024-06-11 13:15:08 -07:00
merge.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
merge.h
mergesort.h
midx-write.c midx: teach `midx_fanout_add_midx_fanout()` about incremental MIDXs 2024-08-06 12:01:38 -07:00
midx.c midx: support reading incremental MIDX chains 2024-08-06 12:01:38 -07:00
midx.h midx: support reading incremental MIDX chains 2024-08-06 12:01:38 -07:00
name-hash.c
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notes-cache.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
notes-cache.h
notes-merge.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
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notes-utils.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
notes-utils.h commit: fix leaking parents when calling `commit_tree_extended()` 2024-06-11 13:15:07 -07:00
notes.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
notes.h revision: fix leaking display notes 2024-06-11 13:15:05 -07:00
object-file-convert.c hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
object-file-convert.h
object-file.c Merge branch 'ew/object-convert-leakfix' 2024-07-02 09:59:01 -07:00
object-file.h
object-name.c midx: introduce `bsearch_one_midx()` 2024-08-06 12:01:36 -07:00
object-name.h object-name: free leaking object contexts 2024-06-11 13:15:05 -07:00
object-store-ll.h
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object.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
object.h Merge branch 'tb/path-filter-fix' 2024-07-08 14:53:10 -07:00
oid-array.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
oid-array.h
oidmap.c
oidmap.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
oidset.c oidset: pass hash algorithm when parsing file 2024-06-14 10:26:34 -07:00
oidset.h oidset: pass hash algorithm when parsing file 2024-06-14 10:26:34 -07:00
oidtree.c global: ensure that object IDs are always padded 2024-06-14 10:26:32 -07:00
oidtree.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
pack-bitmap-write.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
pack-bitmap.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
pack-bitmap.h pseudo-merge: implement support for finding existing merges 2024-05-24 11:40:44 -07:00
pack-check.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
pack-mtimes.c
pack-mtimes.h
pack-objects.c
pack-objects.h
pack-revindex.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
pack-revindex.h
pack-write.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
pack.h
packfile.c midx: support reading incremental MIDX chains 2024-08-06 12:01:38 -07:00
packfile.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
pager.c Merge branch 'rj/pager-die-upon-exec-failure' 2024-07-08 14:53:08 -07:00
pager.h
parallel-checkout.c global: ensure that object IDs are always padded 2024-06-14 10:26:32 -07:00
parallel-checkout.h
parse-options-cb.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
parse-options.c
parse-options.h parse-options: cast long name for OPTION_ALIAS 2024-06-07 10:30:53 -07:00
parse.c config: introduce `git_config_double()` 2024-05-24 11:40:42 -07:00
parse.h config: introduce `git_config_double()` 2024-05-24 11:40:42 -07:00
patch-delta.c
patch-ids.c
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path.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
path.h Merge branch 'jc/worktree-git-path' 2024-06-24 16:39:15 -07:00
pathspec.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
pathspec.h Merge branch 'as/pathspec-h-typofix' 2024-07-12 08:41:57 -07:00
pkt-line.c
pkt-line.h
preload-index.c
preload-index.h
pretty.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
pretty.h Merge branch 'rs/date-mode-pass-by-value' 2024-04-16 14:50:29 -07:00
prio-queue.c
prio-queue.h
progress.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
progress.h
promisor-remote.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
promisor-remote.h config: clarify memory ownership in `git_config_string()` 2024-05-27 11:20:00 -07:00
prompt.c
prompt.h
protocol-caps.c protocol-caps: use hash algorithm from passed-in repository 2024-06-14 10:26:34 -07:00
protocol-caps.h
protocol.c
protocol.h
prune-packed.c
prune-packed.h
pseudo-merge.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
pseudo-merge.h pseudo-merge: implement support for finding existing merges 2024-05-24 11:40:44 -07:00
quote.c
quote.h
range-diff.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
range-diff.h format-patch: run range-diff with larger creation-factor 2024-05-06 11:57:22 -07:00
reachable.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
reachable.h
read-cache-ll.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
read-cache.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
read-cache.h
rebase-interactive.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
rebase-interactive.h rebase -i: pass struct replay_opts to parse_insn_line() 2024-05-30 10:02:56 -07:00
rebase.c
rebase.h
ref-filter.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
ref-filter.h ref-filter: properly distinuish pseudo and root refs 2024-05-15 07:30:52 -07:00
reflog-walk.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
reflog-walk.h
reflog.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
reflog.h
refs.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
refs.h Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
refspec.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
refspec.h refspec: remove global tag refspec structure 2024-06-07 10:30:49 -07:00
remote-curl.c Merge branch 'jk/remote-wo-url' 2024-07-02 09:59:01 -07:00
remote.c Merge branch 'jk/remote-wo-url' 2024-07-02 09:59:01 -07:00
remote.h Merge branch 'jk/remote-wo-url' 2024-07-02 09:59:01 -07:00
replace-object.c replace-object: use hash algorithm from passed-in repository 2024-06-14 10:26:34 -07:00
replace-object.h
repo-settings.c Merge branch 'tb/path-filter-fix' 2024-07-08 14:53:10 -07:00
repository.c Merge branch 'ps/ref-storage-migration' 2024-06-17 15:55:55 -07:00
repository.h Merge branch 'tb/path-filter-fix' 2024-07-08 14:53:10 -07:00
rerere.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
rerere.h
reset.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
reset.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
resolve-undo.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
resolve-undo.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
revision.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
revision.h
run-command.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
run-command.h run-command: introduce function to prepare auto-maintenance process 2024-04-17 08:42:26 -07:00
sane-ctype.h
scalar.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
send-pack.c Merge branch 'jc/disable-push-nego-for-deletion' 2024-07-15 10:11:43 -07:00
send-pack.h
sequencer.c Merge branch 'ps/leakfixes-more' 2024-07-08 14:53:10 -07:00
sequencer.h Merge branch 'pw/rebase-i-error-message' into maint-2.45 2024-07-02 09:27:56 -07:00
serve.c hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
serve.h
server-info.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
server-info.h
setup.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
setup.h refs: convert ref storage format to an enum 2024-06-06 09:04:31 -07:00
sh-i18n--envsubst.c
sha1dc_git.c
sha1dc_git.h
shallow.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
shallow.h
shared.mak
shell.c
shortlog.h
sideband.c
sideband.h
sigchain.c
sigchain.h
simple-ipc.h
sparse-index.c Merge branch 'ds/advice-sparse-index-expansion' 2024-07-16 11:18:56 -07:00
sparse-index.h
split-index.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
split-index.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
stable-qsort.c
statinfo.c
statinfo.h
strbuf.c Merge branch 'gt/t-hash-unit-test' 2024-06-12 13:37:15 -07:00
strbuf.h strbuf: introduce strbuf_addstrings() to repeatedly add a string 2024-05-29 09:09:39 -07:00
streaming.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
streaming.h
string-list.c
string-list.h
strmap.c
strmap.h
strvec.c strvec: add functions to replace and remove strings 2024-05-27 11:20:02 -07:00
strvec.h strvec: add functions to replace and remove strings 2024-05-27 11:20:02 -07:00
sub-process.c
sub-process.h
submodule-config.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
submodule-config.h
submodule.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
submodule.h Sync with 2.39.4 2024-04-19 12:38:37 +02:00
symlinks.c
symlinks.h
tag.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
tag.h refs: pass repo when peeling objects 2024-05-17 10:33:39 -07:00
tar.h
tempfile.c
tempfile.h
thread-utils.c
thread-utils.h
tmp-objdir.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
tmp-objdir.h
trace.c
trace.h
trace2.c
trace2.h __attribute__: trace2_region_enter_printf() is like "printf" 2024-06-10 09:16:19 -07:00
trailer.c global: improve const correctness when assigning string constants 2024-06-07 10:30:48 -07:00
trailer.h Merge branch 'la/hide-trailer-info' 2024-05-23 11:04:27 -07:00
transport-helper.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
transport-internal.h
transport.c Merge branch 'xx/bundie-uri-fixes' 2024-07-08 14:53:11 -07:00
transport.h
tree-diff.c hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
tree-walk.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
tree-walk.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00
tree.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
tree.h
unicode-width.h
unimplemented.sh
unix-socket.c
unix-socket.h
unix-stream-server.c
unix-stream-server.h
unpack-trees.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
unpack-trees.h
upload-pack.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
upload-pack.h
url.c
url.h
urlmatch.c
urlmatch.h
usage.c
userdiff.c Merge branch 'rs/diff-exit-code-with-external-diff' 2024-06-20 15:45:08 -07:00
userdiff.h Merge branch 'rs/diff-exit-code-with-external-diff' 2024-06-20 15:45:08 -07:00
utf8.c
utf8.h
varint.c
varint.h
version.c
version.h
versioncmp.c
versioncmp.h
walker.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
walker.h
wildmatch.c
wildmatch.h
worktree.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
worktree.h Merge branch 'jc/worktree-git-path' 2024-06-24 16:39:15 -07:00
wrap-for-bin.sh
wrapper.c don't report vsnprintf(3) error as bug 2024-04-21 12:27:07 -07:00
wrapper.h
write-or-die.c
write-or-die.h
ws.c
ws.h
wt-status.c Merge branch 'ps/use-the-repository' 2024-07-02 09:59:00 -07:00
wt-status.h
xdiff-interface.c global: introduce `USE_THE_REPOSITORY_VARIABLE` macro 2024-06-14 10:26:33 -07:00
xdiff-interface.h hash-ll: merge with "hash.h" 2024-06-14 10:26:33 -07:00

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.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-<commandname>.txt 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.txt (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