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Jeff King 8216cf9419 loose_object_info(): BUG() on inflating content with unknown type 
After unpack_loose_header() returns, it will have inflated not only the
object header, but possibly some bytes of the object content. When we
call unpack_loose_rest() to extract the actual content, it finds those
extra bytes by skipping past the header's terminating NUL in the buffer.
Like this:

  int bytes = strlen(buffer) + 1;
  n = stream->total_out - bytes;
  ...
  memcpy(buf, (char *) buffer + bytes, n);

This won't work with the OBJECT_INFO_ALLOW_UNKNOWN_TYPE flag, as there
we allow a header of arbitrary size. We put into a strbuf, but feed only
the final 32-byte chunk we read to unpack_loose_rest(). In that case
stream->total_out may unexpectedly large, and thus our "n" will be
large, causing an out-of-bounds read (we do check it against our
allocated buffer size, which prevents an out-of-bounds write).

Probably this could be made to work by feeding the strbuf to
unpack_loose_rest(), along with adjusting some types (e.g., "bytes"
would need to be a size_t, since it is no longer operating on a 32-byte
buffer).

But I don't think it's possible to actually trigger this in practice.
The only caller who passes ALLOW_UNKNOWN_TYPE is cat-file, which only
allows it with the "-t" and "-s" options (neither of which access the
content). There is one way you can _almost_ trigger it: the oid compat
routines (i.e., accessing sha1 via sha256 names and vice versa) will
convert objects on the fly (which requires access to the content) using
the same flags that were passed in. So in theory this:

  t='some very large type field that causes an extra inflate call'
  sha1_oid=$(git hash-object -w -t "$t" file)
  sha256_oid=$(git rev-parse --output-object-format=sha256 $sha1_oid)
  git cat-file --allow-unknown-type -s $sha256_oid

would try to access the content. But it doesn't work, because using
compat objects requires an entry in the .git/objects/loose-object-idx
file, and we don't generate such an entry for non-standard types (see
the "compat" section of write_object_file_literally()).

If we use "t=blob" instead, then it does access the compat object, but
it doesn't trigger the problem (because "blob" is a standard short type
name, and it fits in the initial 32-byte buffer).

So given that this is almost a memory error bug, I think it's worth
addressing. But because we can't actually trigger the situation, I'm
hesitant to try a fix that we can't run. Instead let's document the
restriction and protect ourselves from the out-of-bounds read by adding
a BUG() check.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
 		2025-02-25 10:24:54 -08:00
.github Sync with 2.43.6 2024-11-26 22:14:59 +01:00
Documentation Git 2.44.3 2024-11-26 22:15:00 +01:00
block-sha1
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builtin Merge branch 'fixes/2.45.1/2.43' into fixes/2.45.1/2.44 2024-05-24 16:58:35 -07:00
ci Merge branch 'fixes/2.45.1/2.43' into fixes/2.45.1/2.44 2024-05-24 16:58:35 -07:00
compat Sync with 2.43.6 2024-11-26 22:14:59 +01:00
contrib Merge branch 'pb/complete-config' 2024-02-14 15:36:06 -08:00
ewah ewah: implement `bitmap_is_empty()` 2023-12-14 14:38:07 -08:00
git-gui Merge branch 'js/update-urls-in-doc-and-comment' into maint-2.43 2024-02-08 16:22:01 -08:00
gitk-git doc: switch links to https 2023-11-26 10:07:05 +09:00
gitweb Merge branch 'js/update-urls-in-doc-and-comment' into maint-2.43 2024-02-08 16:22:01 -08:00
mergetools
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negotiator treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
oss-fuzz Merge branch 'js/oss-fuzz-build-in-ci' 2024-01-29 16:03:00 -08:00
perl Merge branch 'js/update-urls-in-doc-and-comment' into maint-2.43 2024-02-08 16:22:01 -08:00
po l10n: zh_TW: Git 2.44 2024-02-18 21:03:43 +08:00
refs Merge branch 'ps/worktree-refdb-initialization' 2024-01-26 08:54:46 -08:00
reftable Merge branch 'jc/comment-style-fixes' into maint-2.43 2024-02-13 14:44:48 -08:00
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t Sync with 2.43.6 2024-11-26 22:14:59 +01:00
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CODE_OF_CONDUCT.md CoC: whitespace fix 2024-01-23 10:40:10 -08:00
COPYING
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GIT-VERSION-GEN Git 2.44.3 2024-11-26 22:15:00 +01:00
INSTALL Sync with 2.42.2 2024-04-19 12:38:50 +02:00
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Makefile Merge branch 'fixes/2.45.1/2.40' into fixes/2.45.1/2.41 2024-05-24 16:57:02 -07:00
README.md Merge branch 'jc/majordomo-to-subspace' into maint-2.43 2024-02-13 14:44:50 -08:00
RelNotes Git 2.44.3 2024-11-26 22:15:00 +01:00
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advice.c advice: allow disabling the automatic hint in advise_if_enabled() 2024-01-16 13:07:00 -08:00
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config.mak.uname Makefile: detect new Homebrew location for ARM-based Macs 2024-01-18 11:53:17 -08:00
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git-archimport.perl perl: bump the required Perl version to 5.8.1 from 5.8.0 2023-11-17 07:26:32 +09:00
git-compat-util.h Merge branch 'tb/multi-pack-verbatim-reuse' 2024-01-12 16:09:56 -08:00
git-curl-compat.h remote-curl: add Transfer-Encoding header only for older curl 2024-04-10 19:24:48 +02:00
git-cvsexportcommit.perl perl: bump the required Perl version to 5.8.1 from 5.8.0 2023-11-17 07:26:32 +09:00
git-cvsimport.perl Merge branch 'js/update-urls-in-doc-and-comment' into maint-2.43 2024-02-08 16:22:01 -08:00
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pack-objects.c pack-objects: free packing_data in more places 2023-12-14 14:38:07 -08:00
pack-objects.h pack-objects: free packing_data in more places 2023-12-14 14:38:07 -08:00
pack-revindex.c pack-revindex: implement `midx_pair_to_pack_pos()` 2023-12-14 14:38:08 -08:00
pack-revindex.h pack-revindex: implement `midx_pair_to_pack_pos()` 2023-12-14 14:38:08 -08:00
pack-write.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
pack.h
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packfile.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
packfile.h packfile.c: fix a typo in `each_file_in_pack_dir_fn()`'s declaration 2023-11-20 08:15:50 +09:00
pager.c
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pager.h
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parallel-checkout.c
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parallel-checkout.h
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parse-options-cb.c
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parse-options.c Merge branch 'rs/parse-options-with-keep-unknown-abbrev-fix' into maint-2.43 2024-02-13 14:44:48 -08:00
parse-options.h parse-options: make CMDMODE errors more precise 2023-10-29 09:15:18 +09:00
parse.c parse: separate out parsing functions from config.h 2023-09-29 15:14:57 -07:00
parse.h parse: separate out parsing functions from config.h 2023-09-29 15:14:57 -07:00
patch-delta.c
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patch-ids.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
patch-ids.h
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path.c Sync with 2.43.4 2024-04-19 12:38:54 +02:00
path.h refs: convert MERGE_AUTOSTASH to become a normal pseudo-ref 2024-01-19 11:10:41 -08:00
pathspec.c attr: enable attr pathspec magic for git-add and git-stash 2023-11-04 17:00:27 +09:00
pathspec.h
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pkt-line.c Merge branch 'jx/sideband-chomp-newline-fix' into maint-2.43 2024-02-08 16:22:11 -08:00
pkt-line.h Merge branch 'jx/sideband-chomp-newline-fix' into maint-2.43 2024-02-08 16:22:11 -08:00
preload-index.c parse: separate out parsing functions from config.h 2023-09-29 15:14:57 -07:00
preload-index.h
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pretty.c pretty: fix ref filtering for %(decorate) formats 2023-10-09 11:25:13 -07:00
pretty.h
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prio-queue.c
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prio-queue.h
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progress.c parse: separate out parsing functions from config.h 2023-09-29 15:14:57 -07:00
progress.h
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promisor-remote.c Sync with 2.41.1 2024-04-19 12:38:46 +02:00
promisor-remote.h
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prompt.c parse: separate out parsing functions from config.h 2023-09-29 15:14:57 -07:00
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protocol-caps.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
protocol-caps.h
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protocol.c
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protocol.h doc: switch links to https 2023-11-26 10:07:05 +09:00
prune-packed.c
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quote.c
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range-diff.c Merge branch 'kh/range-diff-notes' 2023-09-29 09:04:15 -07:00
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reachable.c prune: mark rebase autostash and orig-head as reachable 2024-02-09 10:04:59 -08:00
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read-cache-ll.h cache: add fake_lstat() 2023-09-15 17:08:46 -07:00
read-cache.c Sync with 2.43.4 2024-04-19 12:38:54 +02:00
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rebase-interactive.c
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ref-filter.c Merge branch 'en/header-cleanup' into maint-2.43 2024-02-08 16:22:10 -08:00
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reflog.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
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refs.c Merge branch 'ps/not-so-many-refs-are-special' 2024-01-29 16:03:00 -08:00
refs.h Merge branch 'ps/worktree-refdb-initialization' 2024-01-26 08:54:46 -08:00
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remote-curl.c Sync with 2.43.4 2024-04-19 12:38:54 +02:00
remote.c Merge branch 'en/header-cleanup' 2024-01-08 14:05:15 -08:00
remote.h Merge branch 'jc/retire-cas-opt-name-constant' into maint-2.43 2024-02-08 16:22:09 -08:00
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repo-settings.c pack-objects: enable multi-pack reuse via `feature.experimental` 2024-02-05 15:27:01 -08:00
repository.c Sync with 2.43.4 2024-04-19 12:38:54 +02:00
repository.h pack-objects: enable multi-pack reuse via `feature.experimental` 2024-02-05 15:27:01 -08:00
rerere.c Merge branch 'js/check-null-from-read-object-file' 2024-02-14 15:36:06 -08:00
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reset.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
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resolve-undo.c Merge branch 'jc/unresolve-removal' 2023-10-02 11:20:00 -07:00
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revision.c Merge branch 'en/header-cleanup' into maint-2.43 2024-02-08 16:22:10 -08:00
revision.h rev-list: add commit object support in `--missing` option 2023-11-01 12:07:18 +09:00
run-command.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
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sane-ctype.h
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scalar.c Merge branch 'ds/scalar-updates' into maint-2.42 2023-11-02 16:53:15 +09:00
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sequencer.c Merge branch 'vn/rebase-with-cherry-pick-authorship' 2024-02-14 15:36:05 -08:00
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server-info.c
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setup.c Sync with 2.43.4 2024-04-19 12:38:54 +02:00
setup.h Sync with 2.43.4 2024-04-19 12:38:54 +02:00
sh-i18n--envsubst.c doc: switch links to https 2023-11-26 10:07:05 +09:00
sha1dc_git.c
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shallow.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
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shared.mak Makefile: simplify output of the libpath_template 2024-01-31 14:43:00 -08:00
shell.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
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sideband.c Merge branch 'cp/sideband-array-index-comment-fix' into maint-2.43 2024-02-08 16:22:12 -08:00
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sigchain.c
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simple-ipc.h
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sparse-index.c Merge branch 'jh/sparse-index-expand-to-path-fix' 2024-02-08 13:20:34 -08:00
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stable-qsort.c
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statinfo.c Merge branch 'jc/fake-lstat' 2023-12-27 14:52:24 -08:00
statinfo.h cache: add fake_lstat() 2023-09-15 17:08:46 -07:00
strbuf.c Sync with 2.42.4 2024-11-26 22:14:59 +01:00
strbuf.h Sync with 2.42.4 2024-11-26 22:14:59 +01:00
streaming.c
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streaming.h
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string-list.c
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strmap.c
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strvec.c strvec: drop unnecessary include of hex.h 2023-11-03 08:26:55 +09:00
strvec.h strvec: use correct member name in comments 2024-01-12 13:38:07 -08:00
sub-process.c
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submodule-config.c Merge branch 'vd/fsck-submodule-url-test' 2024-01-26 08:54:47 -08:00
submodule-config.h Merge branch 'vd/fsck-submodule-url-test' 2024-01-26 08:54:47 -08:00
submodule.c Sync with 2.42.2 2024-04-19 12:38:50 +02:00
submodule.h Sync with 2.39.4 2024-04-19 12:38:37 +02:00
symlinks.c
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symlinks.h
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tag.c
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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 treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
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trace.c doc: switch links to https 2023-11-26 10:07:05 +09:00
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trace2.c Merge branch 'en/header-cleanup' into maint-2.43 2024-02-08 16:22:10 -08:00
trace2.h trace2: fix signature of trace2_def_param() macro 2023-11-23 10:30:32 +09:00
trailer.c Merge branch 'la/trailer-cleanups' into maint-2.43 2024-02-22 16:09:45 -08:00
trailer.h trailer: use offsets for trailer_start/trailer_end 2023-12-20 11:55:04 -08:00
transport-helper.c Merge branch 'jk/fetch-auto-tag-following-fix' 2024-02-02 11:31:51 -08:00
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transport.c Merge branch 'es/some-up-to-date-messages-must-stay' 2024-01-26 08:54:45 -08:00
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tree-diff.c
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tree.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
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unicode-width.h unicode: update the width tables to Unicode 15.1 2023-09-25 16:17:28 -07:00
unimplemented.sh
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unix-socket.c
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unix-stream-server.c
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unpack-trees.c Merge branch 'cw/prelim-cleanup' 2023-10-10 11:39:14 -07:00
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url.c hex-ll: separate out non-hash-algo functions 2023-09-29 15:14:56 -07:00
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urlmatch.c hex-ll: separate out non-hash-algo functions 2023-09-29 15:14:56 -07:00
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usage.c
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userdiff.c
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userdiff.h
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utf8.c doc: switch links to https 2023-11-26 10:07:05 +09:00
utf8.h doc: switch links to https 2023-11-26 10:07:05 +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
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wildmatch.c
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worktree.c Merge branch 'rj/status-bisect-while-rebase' into maint-2.43 2024-02-08 16:22:04 -08:00
worktree.h worktree: expose interface to look up worktree by name 2024-01-08 13:17:30 -08:00
wrap-for-bin.sh
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wrapper.c treewide: remove unnecessary includes in source files 2023-12-26 12:04:31 -08:00
wrapper.h wrapper: reduce scope of remove_or_warn() 2023-09-29 15:14:56 -07:00
write-or-die.c write-or-die: fix the polarity of GIT_FLUSH environment variable 2024-02-13 11:57:28 -08:00
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wt-status.c Merge branch 'rj/status-bisect-while-rebase' into maint-2.43 2024-02-08 16:22:04 -08:00
wt-status.h status: fix branch shown when not only bisecting 2023-10-16 15:05:27 -07:00
xdiff-interface.c Merge branch 'en/header-cleanup' into maint-2.43 2024-02-08 16:22:10 -08:00
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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