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A fork of Git containing Microsoft-specific patches.
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Jeff King 0750bb5b51 cat-file: support "unordered" output for --batch-all-objects 
If you're going to access the contents of every object in a
packfile, it's generally much more efficient to do so in
pack order, rather than in hash order. That increases the
locality of access within the packfile, which in turn is
friendlier to the delta base cache, since the packfile puts
related deltas next to each other. By contrast, hash order
is effectively random, since the sha1 has no discernible
relationship to the content.

This patch introduces an "--unordered" option to cat-file
which iterates over packs in pack-order under the hood. You
can see the results when dumping all of the file content:

  $ time ./git cat-file --batch-all-objects --buffer --batch | wc -c
  6883195596

  real	0m44.491s
  user	0m42.902s
  sys	0m5.230s

  $ time ./git cat-file --unordered \
                        --batch-all-objects --buffer --batch | wc -c
  6883195596

  real	0m6.075s
  user	0m4.774s
  sys	0m3.548s

Same output, different order, way faster. The same speed-up
applies even if you end up accessing the object content in a
different process, like:

  git cat-file --batch-all-objects --buffer --batch-check |
  grep blob |
  git cat-file --batch='%(objectname) %(rest)' |
  wc -c

Adding "--unordered" to the first command drops the runtime
in git.git from 24s to 3.5s.

  Side note: there are actually further speedups available
  for doing it all in-process now. Since we are outputting
  the object content during the actual pack iteration, we
  know where to find the object and could skip the extra
  lookup done by oid_object_info(). This patch stops short
  of that optimization since the underlying API isn't ready
  for us to make those sorts of direct requests.

So if --unordered is so much better, why not make it the
default? Two reasons:

  1. We've promised in the documentation that --batch-all-objects
     outputs in hash order. Since cat-file is plumbing,
     people may be relying on that default, and we can't
     change it.

  2. It's actually _slower_ for some cases. We have to
     compute the pack revindex to walk in pack order. And
     our de-duplication step uses an oidset, rather than a
     sort-and-dedup, which can end up being more expensive.
     If we're just accessing the type and size of each
     object, for example, like:

       git cat-file --batch-all-objects --buffer --batch-check

     my best-of-five warm cache timings go from 900ms to
     1100ms using --unordered. Though it's possible in a
     cold-cache or under memory pressure that we could do
     better, since we'd have better locality within the
     packfile.

And one final question: why is it "--unordered" and not
"--pack-order"? The answer is again two-fold:

  1. "pack order" isn't a well-defined thing across the
     whole set of objects. We're hitting loose objects, as
     well as objects in multiple packs, and the only
     ordering we're promising is _within_ a single pack. The
     rest is apparently random.

  2. The point here is optimization. So we don't want to
     promise any particular ordering, but only to say that
     we will choose an ordering which is likely to be
     efficient for accessing the object content. That leaves
     the door open for further changes in the future without
     having to add another compatibility option.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
 		2018-08-13 13:48:31 -07:00
.github
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Documentation cat-file: support "unordered" output for --batch-all-objects 2018-08-13 13:48:31 -07:00
block-sha1
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builtin cat-file: support "unordered" output for --batch-all-objects 2018-08-13 13:48:31 -07:00
ci Merge branch 'nd/travis-gcc-8' 2018-05-30 14:04:08 +09:00
compat Merge branch 'nd/command-list' 2018-07-24 14:50:50 -07:00
contrib Merge branch 'ds/commit-graph-fsck' 2018-08-02 15:30:40 -07:00
ewah ewah: delete unused 'rlwit_discharge_empty()' 2018-06-21 09:39:48 -07:00
git-gui Merge branch 'cb/git-gui-ttk-style' 2018-04-25 13:28:49 +09:00
gitk-git
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gitweb
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mergetools mergetools: add support for guiffy 2018-04-06 08:11:39 +09:00
negotiator Merge branch 'jt/fetch-negotiator-skipping' 2018-08-02 15:30:46 -07:00
perl Merge branch 'ab/git-svn-get-record-typofix' 2018-05-08 15:59:28 +09:00
po l10n: ko.po: Update Korean translation 2018-06-19 02:19:42 +09:00
ppc
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refs Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
sha1collisiondetection@19d97bf5af
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sha1dc
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t cat-file: support "unordered" output for --batch-all-objects 2018-08-13 13:48:31 -07:00
templates Update shell scripts to compute empty tree object ID 2018-05-02 13:59:53 +09:00
vcs-svn Convert remaining die*(BUG) messages 2018-05-06 19:06:14 +09:00
xdiff xdiff/xdiffi.c: remove unneeded function declarations 2018-07-17 11:25:31 -07:00
.clang-format
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.gitattributes .gitattributes: add a diff driver for Python 2018-04-27 09:18:55 +09:00
.gitignore Merge branch 'ag/rebase-p' 2018-06-25 13:22:39 -07:00
.gitmodules
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.mailmap .mailmap: merge different spellings of names 2018-06-29 09:29:44 -07:00
.travis.yml travis-ci: run gcc-8 on linux-gcc jobs 2018-05-21 14:14:09 +09:00
.tsan-suppressions
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COPYING
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GIT-VERSION-GEN Prepare to start 2.19 cycle 2018-06-25 13:22:27 -07:00
INSTALL
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LGPL-2.1
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Makefile Merge branch 'jt/commit-graph-per-object-store' 2018-08-02 15:30:47 -07:00
README.md note git-security@googlegroups.com in more places 2018-06-01 09:24:11 +09:00
RelNotes Prepare to start 2.19 cycle 2018-06-25 13:22:27 -07:00
abspath.c
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aclocal.m4
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advice.c Merge branch 'ab/checkout-default-remote' 2018-08-02 15:30:41 -07:00
advice.h Merge branch 'ab/checkout-default-remote' 2018-08-02 15:30:41 -07:00
alias.c completion: add and use --list-cmds=alias 2018-05-21 13:23:14 +09:00
alias.h completion: add and use --list-cmds=alias 2018-05-21 13:23:14 +09:00
alloc.c Merge branch 'sb/object-store-alloc' 2018-06-25 13:22:38 -07:00
alloc.h alloc: allow arbitrary repositories for alloc functions 2018-05-16 11:16:50 +09:00
apply.c Merge branch 'jm/cache-entry-from-mem-pool' 2018-08-02 15:30:43 -07:00
apply.h apply: add --intent-to-add 2018-05-29 12:42:30 +09:00
archive-tar.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
archive-zip.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
archive.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
archive.h
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argv-array.c Merge branch 'ma/unpack-trees-free-msgs' 2018-05-30 21:51:29 +09:00
argv-array.h Merge branch 'ma/unpack-trees-free-msgs' 2018-05-30 21:51:29 +09:00
attr.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
attr.h
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base85.c
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bisect.c commit: add repository argument to lookup_commit_reference 2018-06-29 10:43:39 -07:00
bisect.h
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blame.c Merge branch 'jm/cache-entry-from-mem-pool' 2018-08-02 15:30:43 -07:00
blame.h blame: use commit-slab for blame suspects instead of commit->util 2018-05-21 14:07:20 +09:00
blob.c blob: allow lookup_blob to handle arbitrary repositories 2018-06-29 10:43:39 -07:00
blob.h blob: allow lookup_blob to handle arbitrary repositories 2018-06-29 10:43:39 -07:00
branch.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
branch.h
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builtin.h Merge branch 'jk/show-index' 2018-06-25 13:22:37 -07:00
bulk-checkin.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
bulk-checkin.h
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bundle.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
bundle.h
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cache-tree.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
cache-tree.h
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cache.h for_each_packed_object: support iterating in pack-order 2018-08-13 13:48:28 -07:00
chdir-notify.c add chdir-notify API 2018-03-30 12:49:57 -07:00
chdir-notify.h add chdir-notify API 2018-03-30 12:49:57 -07:00
check-builtins.sh
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check-racy.c
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check_bindir
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checkout.c checkout & worktree: introduce checkout.defaultRemote 2018-06-11 09:41:02 -07:00
checkout.h checkout: pass the "num_matches" up to callers 2018-06-11 09:41:01 -07:00
color.c Merge branch 'js/use-bug-macro' 2018-05-30 14:04:07 +09:00
color.h color: introduce support for colorizing stderr 2018-04-24 10:38:47 +09:00
column.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
column.h
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combine-diff.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
command-list.txt Merge branch 'nd/command-list' 2018-06-01 15:06:37 +09:00
commit-graph.c for_each_packed_object: support iterating in pack-order 2018-08-13 13:48:28 -07:00
commit-graph.h commit-graph: add repo arg to graph readers 2018-07-17 15:47:48 -07:00
commit-slab-decl.h commit-slab: support shared commit-slab 2018-05-21 14:07:19 +09:00
commit-slab-impl.h commit-slabs: remove realloc counter outside of slab struct 2018-06-29 10:43:40 -07:00
commit-slab.h commit-slab: support shared commit-slab 2018-05-21 14:07:19 +09:00
commit.c Merge branch 'jt/commit-graph-per-object-store' 2018-08-02 15:30:47 -07:00
commit.h Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
common-main.c Merge branch 'dj/runtime-prefix' 2018-05-08 15:59:17 +09:00
config.c Merge branch 'jt/commit-graph-per-object-store' 2018-08-02 15:30:47 -07:00
config.h Merge branch 'jk/fsck-gitmodules-gently' 2018-08-02 15:30:39 -07:00
config.mak.dev Makefile: add a DEVOPTS to get all of -Wextra 2018-04-16 13:54:53 +09:00
config.mak.in
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config.mak.uname Merge branch 'nd/repack-keep-pack' 2018-05-23 14:38:14 +09:00
configure.ac Merge branch 'es/fread-reads-dir-autoconf-fix' 2018-04-25 13:29:01 +09:00
connect.c Merge branch 'nd/command-list' 2018-06-01 15:06:37 +09:00
connect.h fixup! connect.h: avoid forward declaration of an enum 2018-07-09 14:35:39 -07:00
connected.c fetch-pack: write shallow, then check connectivity 2018-07-03 14:57:44 -07:00
connected.h fetch-pack: write shallow, then check connectivity 2018-07-03 14:57:44 -07:00
convert.c Merge branch 'bb/pedantic' 2018-07-24 14:50:47 -07:00
convert.h Merge branch 'ls/checkout-encoding' 2018-05-08 15:59:22 +09:00
copy.c
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credential-cache--daemon.c
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credential-cache.c
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credential-store.c
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credential.c credential: ignore SIGPIPE when writing to credential helpers 2018-03-29 15:33:55 -07:00
credential.h
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csum-file.c csum-file: refactor finalize_hashfile() method 2018-04-02 14:27:30 -07:00
csum-file.h csum-file: refactor finalize_hashfile() method 2018-04-02 14:27:30 -07:00
ctype.c
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daemon.c Merge branch 'lw/daemon-log-destination' 2018-04-25 13:28:58 +09:00
date.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
decorate.c
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decorate.h
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delta.h
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detect-compiler Makefile: detect compiler and enable more warnings in DEVELOPER=1 2018-04-16 13:54:53 +09:00
diff-delta.c
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diff-lib.c Merge branch 'jk/has-uncommitted-changes-fix' 2018-08-02 15:30:38 -07:00
diff-no-index.c
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diff.c Merge branch 'sb/diff-color-move-more' 2018-08-02 15:30:40 -07:00
diff.h Merge branch 'sb/diff-color-move-more' 2018-08-02 15:30:40 -07:00
diffcore-break.c
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diffcore-delta.c
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diffcore-order.c
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diffcore-pickaxe.c regex: do not call `regfree()` if compilation fails 2018-05-21 13:58:32 +09:00
diffcore-rename.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
diffcore.h
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dir-iterator.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
dir-iterator.h
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dir.c Merge branch 'tz/exclude-doc-smallfixes' 2018-07-18 12:20:34 -07:00
dir.h Merge branch 'bc/object-id' 2018-05-30 14:04:10 +09:00
editor.c
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entry.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
environment.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
exec-cmd.c Merge branch 'js/runtime-prefix' 2018-05-08 15:59:34 +09:00
exec-cmd.h Merge branch 'dj/runtime-prefix' 2018-05-08 15:59:17 +09:00
fast-import.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
fetch-negotiator.c negotiator/skipping: skip commits during fetch 2018-07-16 14:51:12 -07:00
fetch-negotiator.h negotiator/skipping: skip commits during fetch 2018-07-16 14:51:12 -07:00
fetch-object.c fetch-pack: put shallow info in output parameter 2018-06-28 09:33:29 -07:00
fetch-object.h
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fetch-pack.c Merge branch 'jt/fetch-negotiator-skipping' 2018-08-02 15:30:46 -07:00
fetch-pack.h Merge branch 'jt/fetch-nego-tip' 2018-08-02 15:30:43 -07:00
fmt-merge-msg.h
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fsck.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
fsck.h fsck: detect gitmodules files 2018-05-21 23:55:12 -04:00
fsmonitor.c Merge branch 'jk/snprintf-truncation' 2018-05-30 21:51:28 +09:00
fsmonitor.h
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generate-cmdlist.sh help: add --config to list all available config 2018-05-29 14:51:28 +09:00
gettext.c Merge branch 'js/runtime-prefix' 2018-05-08 15:59:34 +09:00
gettext.h
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git-add--interactive.perl Merge branch 'pw/add-p-recount' 2018-06-28 12:53:32 -07:00
git-archimport.perl
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git-bisect.sh
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git-compat-util.h Merge branch 'js/use-bug-macro' 2018-05-30 14:04:07 +09:00
git-cvsexportcommit.perl
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git-cvsimport.perl
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git-cvsserver.perl
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git-difftool--helper.sh
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git-filter-branch.sh Merge branch 'mb/filter-branch-optim' 2018-07-18 12:20:32 -07:00
git-instaweb.sh
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git-merge-octopus.sh
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git-merge-one-file.sh merge-one-file: compute empty blob object ID 2018-05-02 13:59:53 +09:00
git-merge-resolve.sh
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git-mergetool--lib.sh
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git-mergetool.sh
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git-p4.py git-p4: python3: fix octal constants 2018-06-19 09:34:32 -07:00
git-parse-remote.sh
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git-quiltimport.sh
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git-rebase--am.sh Merge branch 'pw/rebase-signoff' 2018-04-25 13:28:51 +09:00
git-rebase--interactive.sh Merge branch 'ag/rebase-p' 2018-06-25 13:22:39 -07:00
git-rebase--merge.sh Merge branch 'en/rebase-i-microfixes' 2018-07-18 12:20:33 -07:00
git-rebase--preserve-merges.sh git-rebase--preserve-merges: fix formatting of todo help message 2018-07-06 12:09:27 -07:00
git-rebase.sh Merge branch 'en/rebase-consistency' 2018-07-24 14:50:43 -07:00
git-remote-testgit.sh
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git-request-pull.sh
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git-send-email.perl Merge branch 'jm/send-email-tls-auth-on-batch' 2018-08-02 15:30:46 -07:00
git-sh-i18n.sh
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git-sh-setup.sh
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git-stash.sh Merge branch 'tg/stash-untracked-with-pathspec-fix' 2018-04-10 08:25:45 +09:00
git-submodule.sh Merge branch 'sb/submodule-core-worktree' 2018-07-18 12:20:28 -07:00
git-svn.perl git-svn: search --authors-prog in PATH too 2018-04-05 06:55:02 +00:00
git-web--browse.sh
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git.c Merge branch 'jm/cache-entry-from-mem-pool' 2018-08-02 15:30:43 -07:00
git.rc
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gpg-interface.c gpg-interface: make parse_gpg_output static and remove from interface header 2018-07-11 10:05:22 -07:00
gpg-interface.h gpg-interface: make parse_gpg_output static and remove from interface header 2018-07-11 10:05:22 -07:00
graph.c
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graph.h
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grep.c Merge branch 'tb/grep-only-matching' 2018-08-02 15:30:44 -07:00
grep.h Merge branch 'tb/grep-only-matching' 2018-08-02 15:30:44 -07:00
hash.h
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hashmap.c
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hashmap.h
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help.c Merge branch 'nd/command-list' 2018-06-01 15:06:37 +09:00
help.h completion: drop the hard coded list of config vars 2018-05-29 14:51:28 +09:00
hex.c hex: switch to using the_hash_algo 2018-07-16 14:27:39 -07:00
http-backend.c tag: add repository argument to deref_tag 2018-06-29 10:43:39 -07:00
http-fetch.c Merge branch 'ma/http-walker-no-partial' 2018-05-08 15:59:35 +09:00
http-push.c tag: add repository argument to deref_tag 2018-06-29 10:43:39 -07:00
http-walker.c Merge branch 'sb/object-store' 2018-04-11 13:09:55 +09:00
http.c Merge branch 'bw/remote-curl-compressed-responses' 2018-05-30 21:51:29 +09:00
http.h Merge branch 'jk/snprintf-truncation' 2018-05-30 21:51:28 +09:00
ident.c
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imap-send.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
iterator.h
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khash.h
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kwset.c
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kwset.h
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levenshtein.c
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levenshtein.h
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line-log.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
line-log.h
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line-range.c blame: prevent error if range ends past end of file 2018-06-15 10:29:13 -07:00
line-range.h
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list-objects-filter-options.c list-objects: check if filter is NULL before using 2018-06-12 10:46:56 -07:00
list-objects-filter-options.h
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list-objects-filter.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
list-objects-filter.h
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list-objects.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
list-objects.h
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list.h
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ll-merge.c
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ll-merge.h
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lockfile.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
lockfile.h
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log-tree.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
log-tree.h format-patch: make cover letters always text/plain 2018-05-02 12:55:00 +09:00
ls-refs.c
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ls-refs.h
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mailinfo.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
mailinfo.h
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mailmap.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
mailmap.h
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match-trees.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
mem-pool.c block alloc: add validations around cache_entry lifecyle 2018-07-03 10:58:27 -07:00
mem-pool.h block alloc: add validations around cache_entry lifecyle 2018-07-03 10:58:27 -07:00
merge-blobs.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
merge-blobs.h
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merge-recursive.c Merge branch 'en/dirty-merge-fixes' 2018-08-02 15:30:45 -07:00
merge-recursive.h merge: add merge.renames config setting 2018-05-08 16:19:41 +09:00
merge.c Merge branch 'en/dirty-merge-fixes' 2018-08-02 15:30:45 -07:00
mergesort.c
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mergesort.h
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name-hash.c
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notes-cache.c commit: add repository argument to lookup_commit_reference_gently 2018-06-29 10:43:39 -07:00
notes-cache.h
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notes-merge.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
notes-merge.h
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notes-utils.c commit: add repository argument to lookup_commit 2018-06-29 10:43:39 -07:00
notes-utils.h
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notes.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
notes.h
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object-store.h Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
object.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
object.h Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
oidmap.c
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oidmap.h
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oidset.c
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oidset.h
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pack-bitmap-write.c Merge branch 'jt/remove-pack-bitmap-global' 2018-07-18 12:20:30 -07:00
pack-bitmap.c pack-bitmap: add free function 2018-06-21 12:22:48 -07:00
pack-bitmap.h pack-bitmap: add free function 2018-06-21 12:22:48 -07:00
pack-check.c packfile: add repository argument to unpack_entry 2018-04-26 10:54:27 +09:00
pack-objects.c Merge branch 'js/use-bug-macro' 2018-05-30 14:04:07 +09:00
pack-objects.h Merge branch 'nd/pack-objects-pack-struct' 2018-05-23 14:38:19 +09:00
pack-revindex.c object-store: move packed_git and packed_git_mru to object store 2018-03-26 10:05:46 -07:00
pack-revindex.h
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pack-write.c csum-file: refactor finalize_hashfile() method 2018-04-02 14:27:30 -07:00
pack.h
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packfile.c for_each_packed_object: support iterating in pack-order 2018-08-13 13:48:28 -07:00
packfile.h for_each_packed_object: support iterating in pack-order 2018-08-13 13:48:28 -07:00
pager.c Merge branch 'nd/command-list' 2018-06-01 15:06:37 +09:00
parse-options-cb.c commit: add repository argument to lookup_commit_reference 2018-06-29 10:43:39 -07:00
parse-options.c completion: collapse extra --no-.. options 2018-06-11 10:38:10 -07:00
parse-options.h Merge branch 'ps/contains-id-error-message' 2018-04-10 16:28:20 +09:00
patch-delta.c
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patch-ids.c
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patch-ids.h
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path.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
path.h Merge branch 'bb/pedantic' 2018-07-24 14:50:47 -07:00
pathspec.c Convert remaining die*(BUG) messages 2018-05-06 19:06:14 +09:00
pathspec.h
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pkt-line.c Merge branch 'js/use-bug-macro' 2018-05-30 14:04:07 +09:00
pkt-line.h
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preload-index.c
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pretty.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
pretty.h
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prio-queue.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
prio-queue.h
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progress.c
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progress.h
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prompt.c
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prompt.h
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protocol.c
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protocol.h
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quote.c
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quote.h
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reachable.c tree: add repository argument to lookup_tree 2018-06-29 10:43:38 -07:00
reachable.h
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read-cache.c Merge branch 'en/dirty-merge-fixes' 2018-08-02 15:30:45 -07:00
ref-filter.c Merge branch 'jt/commit-graph-per-object-store' 2018-08-02 15:30:47 -07:00
ref-filter.h Merge branch 'ot/libify-get-ref-atom-value' 2018-05-08 15:59:18 +09:00
reflog-walk.c object: add repository argument to parse_object 2018-06-29 10:43:38 -07:00
reflog-walk.h
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refs.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
refs.h Merge branch 'sb/object-store-replace' 2018-05-08 15:59:21 +09:00
refspec.c Merge branch 'ab/refspec-init-fix' 2018-06-28 12:53:29 -07:00
refspec.h refspec: add back a refspec_item_init() function 2018-06-11 10:11:31 -07:00
remote-curl.c remote-curl: accept compressed responses with protocol v2 2018-05-23 10:24:13 +09:00
remote-testsvn.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
remote.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
remote.h fetch-pack: implement ref-in-want 2018-06-28 09:33:30 -07:00
replace-object.c Merge branch 'sb/object-store-replace' 2018-05-23 14:38:09 +09:00
replace-object.h replace-object: allow lookup_replace_object to handle arbitrary repositories 2018-04-12 11:38:57 +09:00
repository.c Merge branch 'sb/object-store-alloc' 2018-06-25 13:22:38 -07:00
repository.h Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
rerere.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
rerere.h
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resolve-undo.c block alloc: add lifecycle APIs for cache_entry structs 2018-07-03 10:58:27 -07:00
resolve-undo.h
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revision.c Merge branch 'jt/tags-to-promised-blobs-fix' 2018-08-02 15:30:46 -07:00
revision.h Merge branch 'jt/partial-clone-fsck-connectivity' 2018-07-24 14:50:47 -07:00
run-command.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
run-command.h
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send-pack.c shallow: add repository argument to is_repository_shallow 2018-05-18 08:13:10 +09:00
send-pack.h
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sequencer.c Merge branch 'bc/sequencer-export-work-tree-as-well' 2018-08-02 15:30:45 -07:00
sequencer.h Merge branch 'js/sequencer-and-root-commits' 2018-05-30 14:04:04 +09:00
serve.c serve: introduce the server-option capability 2018-04-24 11:24:40 +09:00
serve.h
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server-info.c tag: add repository argument to deref_tag 2018-06-29 10:43:39 -07:00
setup.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
sh-i18n--envsubst.c
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sha1-array.c get_short_oid: sort ambiguous objects by type, then SHA-1 2018-05-11 14:43:23 +09:00
sha1-array.h get_short_oid: sort ambiguous objects by type, then SHA-1 2018-05-11 14:43:23 +09:00
sha1-file.c for_each_*_object: take flag arguments as enum 2018-08-13 13:48:25 -07:00
sha1-lookup.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
sha1-lookup.h
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sha1-name.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
sha1dc_git.c
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sha1dc_git.h
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shallow.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
shell.c Merge branch 'nd/command-list' 2018-06-01 15:06:37 +09:00
shortlog.h
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sideband.c Avoid multiple PREFIX definitions 2018-04-24 11:12:32 +09:00
sideband.h
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sigchain.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
sigchain.h
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split-index.c block alloc: allocate cache entries from mem_pool 2018-07-03 10:58:27 -07:00
split-index.h split-index: convert struct split_index to object_id 2018-05-02 13:59:50 +09:00
strbuf.c strbuf: allocate space with GIT_MAX_HEXSZ 2018-07-16 14:27:39 -07:00
strbuf.h Merge branch 'en/rename-directory-detection-reboot' 2018-05-23 14:38:19 +09:00
streaming.c cache.h: add repository argument to oid_object_info_extended 2018-04-26 10:54:27 +09:00
streaming.h
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string-list.c string-list.c: avoid conversion from void * to function pointer 2018-07-09 14:37:50 -07:00
string-list.h
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sub-process.c
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sub-process.h
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submodule-config.c Merge branch 'jk/fsck-gitmodules-gently' 2018-08-02 15:30:39 -07:00
submodule-config.h submodule-config: make 'config_from_gitmodules' private 2018-06-26 12:56:12 -07:00
submodule.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
submodule.h submodule: unset core.worktree if no working tree is present 2018-06-14 14:13:46 -07:00
symlinks.c
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tag.c Merge branch 'jt/tags-to-promised-blobs-fix' 2018-08-02 15:30:46 -07:00
tag.h tag.c: allow deref_tag to handle arbitrary repositories 2018-06-29 10:43:40 -07:00
tar.h
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tempfile.c
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tempfile.h
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thread-utils.c
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thread-utils.h
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tmp-objdir.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
tmp-objdir.h
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trace.c trace.c: export trace_setup_key 2018-03-30 12:49:57 -07:00
trace.h trace.c: export trace_setup_key 2018-03-30 12:49:57 -07:00
trailer.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
trailer.h
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transport-helper.c Merge branch 'jt/fetch-nego-tip' 2018-08-02 15:30:43 -07:00
transport-internal.h fetch-pack: put shallow info in output parameter 2018-06-28 09:33:29 -07:00
transport.c Merge branch 'jt/fetch-nego-tip' 2018-08-02 15:30:43 -07:00
transport.h Merge branch 'jt/fetch-nego-tip' 2018-08-02 15:30:43 -07:00
tree-diff.c
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tree-walk.c Merge branch 'bc/object-id' 2018-08-02 15:30:39 -07:00
tree-walk.h tree-walk: convert get_tree_entry_follow_symlinks to object_id 2018-05-02 13:59:50 +09:00
tree.c Merge branch 'jm/cache-entry-from-mem-pool' 2018-08-02 15:30:43 -07:00
tree.h tree: allow lookup_tree to handle arbitrary repositories 2018-06-29 10:43:39 -07:00
unicode-width.h unicode: update the width tables to Unicode 11 2018-07-09 14:02:51 -07:00
unimplemented.sh
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unix-socket.c
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unix-socket.h
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unpack-trees.c Merge branch 'jm/cache-entry-from-mem-pool' 2018-08-02 15:30:43 -07:00
unpack-trees.h unpack_trees_options: free messages when done 2018-05-22 11:59:31 +09:00
upload-pack.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
upload-pack.h
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url.c
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url.h
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urlmatch.c
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urlmatch.h
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usage.c Merge branch 'jk/snprintf-truncation' 2018-05-30 21:51:28 +09:00
userdiff.c userdiff: support new keywords in PHP hunk header 2018-07-06 14:59:28 -07:00
userdiff.h
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utf8.c utf8.c: avoid char overflow 2018-07-09 14:38:12 -07:00
utf8.h Sync with Git 2.17.1 2018-05-29 17:10:05 +09:00
varint.c
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varint.h
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version.c
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version.h
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versioncmp.c
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walker.c Merge branch 'sb/object-store-grafts' 2018-07-18 12:20:28 -07:00
walker.h walker: drop fields of `struct walker` which are always 1 2018-04-24 10:55:04 +09:00
wildmatch.c
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wildmatch.h
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worktree.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
worktree.h
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wrap-for-bin.sh Make running git under other debugger-like programs easy 2018-04-25 10:47:22 +09:00
wrapper.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00
write-or-die.c write_or_die.c: rename to use dashes in file name 2018-04-11 18:11:00 +09:00
ws.c
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wt-status.c Merge branch 'sb/object-store-lookup' 2018-08-02 15:30:42 -07:00
wt-status.h add status config and command line options for rename detection 2018-05-13 10:57:37 +09:00
xdiff-interface.c object-store: move object access functions to object-store.h 2018-05-16 11:42:03 +09:00
xdiff-interface.h
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zlib.c Replace all die("BUG: ...") calls by BUG() ones 2018-05-06 19:06:13 +09:00

README.md

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-.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). To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org. The mailing list archives are available at https://public-inbox.org/git/, http://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