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Tamir Duberstein 5bd39784cd commit-reach: reject cycles in contains walk The memoized contains traversal used by git tag assumes that commit ancestry is acyclic. Replacement refs can violate that assumption, causing it to keep pushing an already active commit until memory is exhausted. Mark commits while they are active and die if the traversal encounters an active commit. Other failures in this walk already die through parse_commit_or_die(); using a second reachability walk would only add a separate policy for malformed history. Suggested-by: Kristofer Karlsson <krka@spotify.com> Signed-off-by: Tamir Duberstein <tamird@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2026-06-12 15:56:44 -07:00
.github	…
Documentation	The 12th batch	2026-06-07 23:58:25 +09:00
bin-wrappers	…
block-sha1	…
builtin	Merge branch 'aj/stash-patch-optimize-temporary-index'	2026-06-07 23:58:25 +09:00
ci	Merge branch 'jc/ci-enable-expensive'	2026-05-21 12:06:48 +09:00
compat	Merge branch 'pt/fsmonitor-linux'	2026-05-31 10:00:38 +09:00
compiler-tricks	…
contrib	Merge branch 'pt/fsmonitor-linux'	2026-05-31 10:00:38 +09:00
ewah	…
git-gui	…
gitk-git	…
gitweb	…
mergetools	…
negotiator	Merge branch 'ds/fetch-negotiation-options'	2026-05-27 14:15:45 +09:00
odb	Merge branch 'ps/odb-in-memory'	2026-05-27 14:15:46 +09:00
oss-fuzz	…
perl	…
po	…
refs	Merge branch 'kn/refs-fsck-skip-lock-files'	2026-05-27 14:15:44 +09:00
reftable	…
sha1	…
sha1collisiondetection@855827c583	…
sha1dc	…
sha256	…
src	…
subprojects	…
t	commit-reach: reject cycles in contains walk	2026-06-12 15:56:44 -07:00
templates	…
tools	generate-configlist: collapse depfile for older Ninja	2026-05-16 22:19:56 +09:00
trace2	…
xdiff	Merge branch 'mm/diff-U-takes-no-negative-values'	2026-05-25 09:40:07 +09:00
.cirrus.yml	…
.clang-format	…
.editorconfig	…
.gitattributes	…
.gitignore	Merge branch 'mm/git-url-parse'	2026-05-21 12:06:48 +09:00
.gitlab-ci.yml	gitlab-ci: update macOS image	2026-05-21 22:31:38 +09:00
.gitmodules	…
.mailmap	…
.tsan-suppressions	…
CODE_OF_CONDUCT.md	…
COPYING	…
Cargo.toml	…
GIT-BUILD-OPTIONS.in	…
GIT-VERSION-FILE.in	…
GIT-VERSION-GEN	…
INSTALL	…
LGPL-2.1	…
Makefile	Merge branch 'pt/fsmonitor-linux'	2026-05-31 10:00:38 +09:00
README.md	…
RelNotes	Start preparing for 2.54.1	2026-05-21 12:42:11 +09:00
SECURITY.md	…
abspath.c	…
abspath.h	…
aclocal.m4	…
add-interactive.c	…
add-interactive.h	…
add-patch.c	…
add-patch.h	…
advice.c	…
advice.h	…
alias.c	…
alias.h	…
alloc.c	…
alloc.h	…
apply.c	apply: plug leak on "patch too large" error	2026-05-16 13:51:16 +09:00
apply.h	…
archive-tar.c	…
archive-zip.c	…
archive.c	setup: stop using `the_repository` in `setup_git_directory()`	2026-05-19 19:36:25 +09:00
archive.h	…
attr.c	…
attr.h	…
banned.h	…
base85.c	…
base85.h	…
bisect.c	bisect: print bisect terms in single quotes	2026-05-14 19:56:34 +09:00
bisect.h	…
blame.c	setup: stop using `the_repository` in `setup_work_tree()`	2026-05-19 19:36:24 +09:00
blame.h	…
blob.c	…
blob.h	…
bloom.c	…
bloom.h	…
branch.c	…
branch.h	…
build.rs	…
builtin.h	Merge branch 'mm/git-url-parse'	2026-05-21 12:06:48 +09:00
bundle-uri.c	…
bundle-uri.h	…
bundle.c	…
bundle.h	…
cache-tree.c	Merge branch 'jt/odb-transaction-write'	2026-05-27 14:15:45 +09:00
cache-tree.h	…
cbtree.c	cbtree: allow using arbitrary wrapper structures for nodes	2026-05-15 04:50:45 +09:00
cbtree.h	cbtree: allow using arbitrary wrapper structures for nodes	2026-05-15 04:50:45 +09:00
chdir-notify.c	…
chdir-notify.h	…
checkout.c	…
checkout.h	…
chunk-format.c	…
chunk-format.h	…
color.c	…
color.h	…
column.c	…
column.h	…
combine-diff.c	…
command-list.txt	Merge branch 'mm/git-url-parse'	2026-05-21 12:06:48 +09:00
commit-graph.c	…
commit-graph.h	…
commit-reach.c	commit-reach: reject cycles in contains walk	2026-06-12 15:56:44 -07:00
commit-reach.h	commit-reach: reject cycles in contains walk	2026-06-12 15:56:44 -07:00
commit-slab-decl.h	…
commit-slab-impl.h	…
commit-slab.h	…
commit.c	Merge branch 'jk/commit-graph-lazy-load-fallback'	2026-05-31 10:00:38 +09:00
commit.h	commit: remove deprecated functions	2026-05-29 05:11:03 +09:00
common-exit.c	…
common-init.c	…
common-init.h	…
common-main.c	…
config.c	…
config.h	…
config.mak.dev	Merge branch 'ps/clang-w-glibc-2.43-and-_Generic' into maint-2.54	2026-05-21 12:23:51 +09:00
config.mak.in	…
config.mak.uname	Merge branch 'pt/fsmonitor-linux'	2026-05-31 10:00:38 +09:00
configure.ac	…
connect.c	Merge branch 'jk/connect-service-enum'	2026-06-02 16:15:28 +09:00
connect.h	Merge branch 'jk/connect-service-enum'	2026-06-02 16:15:28 +09:00
connected.c	Merge branch 'ed/check-connected-close-err-fd-2.53'	2026-05-31 10:00:36 +09:00
connected.h	…
convert.c	…
convert.h	…
copy.c	…
copy.h	…
credential.c	…
credential.h	…
csum-file.c	…
csum-file.h	…
ctype.c	…
daemon.c	setup: stop using `the_repository` in `enter_repo()`	2026-05-19 19:36:24 +09:00
date.c	approxidate: use deferred mday adjustments for "specials"	2026-05-21 22:30:06 +09:00
date.h	…
decorate.c	…
decorate.h	…
delta-islands.c	…
delta-islands.h	…
delta.h	…
diagnose.c	…
diagnose.h	…
diff-delta.c	…
diff-lib.c	…
diff-merges.c	…
diff-merges.h	…
diff-no-index.c	…
diff.c	Merge branch 'mm/diff-U-takes-no-negative-values'	2026-05-25 09:40:07 +09:00
diff.h	…
diffcore-break.c	…
diffcore-delta.c	…
diffcore-order.c	…
diffcore-pickaxe.c	…
diffcore-rename.c	…
diffcore-rotate.c	…
diffcore.h	…
dir-iterator.c	…
dir-iterator.h	…
dir.c	…
dir.h	…
editor.c	…
editor.h	…
entry.c	…
entry.h	…
environment.c	…
environment.h	setup: stop using `the_repository` in `setup_git_env()`	2026-05-19 19:36:24 +09:00
exec-cmd.c	…
exec-cmd.h	…
fetch-negotiator.c	…
fetch-negotiator.h	negotiator: add have_sent() interface	2026-05-20 11:33:24 +09:00
fetch-pack.c	Merge branch 'ds/fetch-negotiation-options'	2026-05-27 14:15:45 +09:00
fetch-pack.h	fetch: add --negotiation-include option for negotiation	2026-05-20 11:33:24 +09:00
fmt-merge-msg.c	…
fmt-merge-msg.h	…
for-each-ref.h	…
fsck.c	…
fsck.h	…
fsmonitor--daemon.h	…
fsmonitor-ipc.c	…
fsmonitor-ipc.h	…
fsmonitor-ll.h	…
fsmonitor-path-utils.h	…
fsmonitor-settings.c	…
fsmonitor-settings.h	…
fsmonitor.c	…
fsmonitor.h	…
gettext.c	…
gettext.h	…
git-archimport.perl	…
git-compat-util.h	Merge branch 'rs/use-builtin-add-overflow-explicitly-on-clang'	2026-05-27 14:15:45 +09:00
git-curl-compat.h	…
git-cvsexportcommit.perl	…
git-cvsimport.perl	…
git-cvsserver.perl	…
git-difftool--helper.sh	…
git-filter-branch.sh	…
git-instaweb.sh	…
git-merge-octopus.sh	…
git-merge-one-file.sh	…
git-merge-resolve.sh	…
git-mergetool--lib.sh	…
git-mergetool.sh	…
git-p4.py	…
git-quiltimport.sh	…
git-request-pull.sh	…
git-send-email.perl	…
git-sh-i18n.sh	…
git-sh-setup.sh	…
git-submodule.sh	…
git-svn.perl	…
git-web--browse.sh	…
git-zlib.c	…
git-zlib.h	…
git.c	Merge branch 'ps/setup-wo-the-repository'	2026-05-27 14:15:46 +09:00
git.rc.in	…
gpg-interface.c	…
gpg-interface.h	…
graph.c	…
graph.h	…
grep.c	…
grep.h	…
hash-lookup.c	…
hash-lookup.h	…
hash.c	…
hash.h	…
hashmap.c	…
hashmap.h	…
help.c	Merge branch 'jh/alias-i18n-fixes' into maint-2.54	2026-05-21 12:30:11 +09:00
help.h	…
hex-ll.c	…
hex-ll.h	…
hex.c	…
hex.h	…
hook.c	…
hook.h	…
http-backend.c	setup: stop using `the_repository` in `enter_repo()`	2026-05-19 19:36:24 +09:00
http-fetch.c	setup: stop using `the_repository` in `setup_git_directory_gently()`	2026-05-19 19:36:24 +09:00
http-push.c	setup: stop using `the_repository` in `setup_git_directory()`	2026-05-19 19:36:25 +09:00
http-walker.c	Merge branch 'jk/dumb-http-alternate-fix'	2026-05-25 09:40:08 +09:00
http.c	Merge branch 'aw/validate-proxy-url-scheme'	2026-05-21 12:06:48 +09:00
http.h	…
ident.c	…
ident.h	…
imap-send.c	setup: stop using `the_repository` in `setup_git_directory_gently()`	2026-05-19 19:36:24 +09:00
iterator.h	…
json-writer.c	…
json-writer.h	…
khash.h	…
kwset.c	…
kwset.h	…
levenshtein.c	…
levenshtein.h	…
line-log.c	setup: stop using `the_repository` in `prefix_path()`	2026-05-19 19:36:24 +09:00
line-log.h	…
line-range.c	…
line-range.h	…
linear-assignment.c	…
linear-assignment.h	…
list-objects-filter-options.c	setup: stop using `the_repository` in `upgrade_repository_format()`	2026-05-19 19:36:25 +09:00
list-objects-filter-options.h	…
list-objects-filter.c	…
list-objects-filter.h	…
list-objects.c	…
list-objects.h	…
list.h	…
lockfile.c	…
lockfile.h	…
log-tree.c	…
log-tree.h	…
loose.c	oidtree: add ability to store data	2026-05-15 04:50:45 +09:00
loose.h	…
ls-refs.c	…
ls-refs.h	…
mailinfo.c	…
mailinfo.h	…
mailmap.c	…
mailmap.h	…
match-trees.c	…
match-trees.h	…
mem-pool.c	…
mem-pool.h	…
merge-blobs.c	…
merge-blobs.h	…
merge-ll.c	…
merge-ll.h	…
merge-ort-wrappers.c	…
merge-ort-wrappers.h	…
merge-ort.c	…
merge-ort.h	…
merge.c	…
merge.h	…
mergesort.h	…
meson.build	Merge branch 'pt/fsmonitor-linux'	2026-05-31 10:00:38 +09:00
meson_options.txt	…
midx-write.c	midx: support custom `--base` for incremental MIDX writes	2026-05-20 11:31:13 +09:00
midx.c	repack: introduce `--write-midx=incremental`	2026-05-20 11:31:14 +09:00
midx.h	repack: introduce `--write-midx=incremental`	2026-05-20 11:31:14 +09:00
name-hash.c	…
name-hash.h	…
notes-cache.c	…
notes-cache.h	…
notes-merge.c	…
notes-merge.h	…
notes-utils.c	…
notes-utils.h	…
notes.c	…
notes.h	…
object-file-convert.c	…
object-file-convert.h	…
object-file.c	Merge branch 'ps/odb-in-memory'	2026-05-27 14:15:46 +09:00
object-file.h	…
object-name.c	setup: stop using `the_repository` in `prefix_path()`	2026-05-19 19:36:24 +09:00
object-name.h	…
object.c	…
object.h	commit-reach: deduplicate queue entries in paint_down_to_common	2026-05-26 07:17:26 +09:00
odb.c	Merge branch 'jt/odb-transaction-write'	2026-05-27 14:15:45 +09:00
odb.h	Merge branch 'jt/odb-transaction-write'	2026-05-27 14:15:45 +09:00
oid-array.c	…
oid-array.h	…
oidmap.c	…
oidmap.h	…
oidset.c	…
oidset.h	…
oidtree.c	oidtree: add ability to store data	2026-05-15 04:50:45 +09:00
oidtree.h	oidtree: add ability to store data	2026-05-15 04:50:45 +09:00
pack-bitmap-write.c	…
pack-bitmap.c	…
pack-bitmap.h	…
pack-check.c	…
pack-mtimes.c	…
pack-mtimes.h	…
pack-objects.c	…
pack-objects.h	…
pack-refs.c	…
pack-refs.h	…
pack-revindex.c	…
pack-revindex.h	…
pack-write.c	…
pack.h	…
packfile.c	Merge branch 'tb/incremental-midx-part-3.3'	2026-05-27 14:15:45 +09:00
packfile.h	…
pager.c	…
pager.h	…
parallel-checkout.c	…
parallel-checkout.h	…
parse-options-cb.c	…
parse-options.c	…
parse-options.h	…
parse.c	…
parse.h	…
patch-delta.c	…
patch-ids.c	…
patch-ids.h	patch-ids.h: add missing trailing parenthesis in documentation comment	2026-05-15 04:24:54 +09:00
path-walk.c	path-walk: support `combine` filter	2026-05-24 18:41:07 +09:00
path-walk.h	path-walk: support `object:type` filter	2026-05-24 18:41:07 +09:00
path.c	…
path.h	…
pathspec.c	setup: stop using `the_repository` in `prefix_path()`	2026-05-19 19:36:24 +09:00
pathspec.h	…
pkt-line.c	…
pkt-line.h	…
preload-index.c	…
preload-index.h	…
pretty.c	Merge branch 'jk/pretty-no-strbuf-presizing'	2026-05-25 09:40:08 +09:00
pretty.h	…
prio-queue.c	…
prio-queue.h	…
progress.c	…
progress.h	…
promisor-remote.c	…
promisor-remote.h	promisor-remote: document caller filtering contract	2026-05-15 04:24:54 +09:00
prompt.c	…
prompt.h	…
protocol-caps.c	…
protocol-caps.h	…
protocol.c	…
protocol.h	…
prune-packed.c	…
prune-packed.h	…
pseudo-merge.c	…
pseudo-merge.h	…
quote.c	quote: simplify internals of dequoting	2026-05-19 12:14:03 +09:00
quote.h	quote: drop sq_dequote_to_argv()	2026-05-19 12:14:03 +09:00
range-diff.c	…
range-diff.h	…
reachable.c	…
reachable.h	…
read-cache-ll.h	…
read-cache.c	Merge branch 'jt/odb-transaction-write'	2026-05-27 14:15:45 +09:00
read-cache.h	…
rebase-interactive.c	…
rebase-interactive.h	…
rebase.c	…
rebase.h	…
ref-filter.c	…
ref-filter.h	…
reflog-walk.c	…
reflog-walk.h	…
reflog.c	…
reflog.h	…
refs.c	Merge branch 'ps/setup-wo-the-repository'	2026-05-27 14:15:46 +09:00
refs.h	…
refspec.c	…
refspec.h	…
remote-curl.c	Merge branch 'ps/setup-wo-the-repository'	2026-05-27 14:15:46 +09:00
remote.c	Merge branch 'ds/fetch-negotiation-options'	2026-05-27 14:15:45 +09:00
remote.h	remote: add remote.*.negotiationInclude config	2026-05-20 11:33:24 +09:00
repack-cruft.c	…
repack-filtered.c	…
repack-geometry.c	repack: introduce `--write-midx=incremental`	2026-05-20 11:31:14 +09:00
repack-midx.c	repack: allow `--write-midx=incremental` without `--geometric`	2026-05-20 11:31:14 +09:00
repack-promisor.c	…
repack.c	repack: introduce `--write-midx=incremental`	2026-05-20 11:31:14 +09:00
repack.h	repack: introduce `--write-midx=incremental`	2026-05-20 11:31:14 +09:00
replace-object.c	…
replace-object.h	…
replay.c	Merge branch 'kh/free-commit-list'	2026-06-07 23:58:24 +09:00
replay.h	…
repo-settings.c	…
repo-settings.h	…
repository.c	…
repository.h	setup: stop using `the_repository` in `upgrade_repository_format()`	2026-05-19 19:36:25 +09:00
rerere.c	…
rerere.h	…
reset.c	…
reset.h	…
resolve-undo.c	…
resolve-undo.h	…
revision.c	Merge branch 'ps/graph-lane-limit'	2026-05-31 10:00:38 +09:00
revision.h	Merge branch 'ps/graph-lane-limit'	2026-05-31 10:00:38 +09:00
run-command.c	Merge branch 'pt/fsmonitor-linux'	2026-05-31 10:00:38 +09:00
run-command.h	Merge branch 'pt/fsmonitor-linux'	2026-05-31 10:00:38 +09:00
sane-ctype.h	…
scalar.c	setup: stop using `the_repository` in `setup_git_directory()`	2026-05-19 19:36:25 +09:00
send-pack.c	Merge branch 'ds/fetch-negotiation-options'	2026-05-27 14:15:45 +09:00
send-pack.h	send-pack: pass negotiation config in push	2026-05-20 11:33:24 +09:00
sequencer.c	Merge branch 'ag/sequencer-remove-unused-struct-member'	2026-05-25 09:40:07 +09:00
sequencer.h	…
serve.c	…
serve.h	…
server-info.c	…
server-info.h	…
setup.c	Merge branch 'ps/setup-wo-the-repository'	2026-05-27 14:15:46 +09:00
setup.h	Merge branch 'ps/setup-wo-the-repository'	2026-05-27 14:15:46 +09:00
sh-i18n--envsubst.c	…
sha1dc_git.c	…
sha1dc_git.h	…
shallow.c	…
shallow.h	…
shared.mak	…
shell.c	…
shortlog.h	…
sideband.c	Merge branch 'rs/sideband-clear-line-before-print'	2026-05-19 09:57:46 +09:00
sideband.h	…
sigchain.c	…
sigchain.h	…
simple-ipc.h	…
sparse-index.c	…
sparse-index.h	…
split-index.c	…
split-index.h	…
stable-qsort.c	…
statinfo.c	…
statinfo.h	…
strbuf.c	strbuf: use st_add3() in strbuf_grow()	2026-05-19 09:52:22 +09:00
strbuf.h	…
string-list.c	…
string-list.h	…
strmap.c	…
strmap.h	…
strvec.c	…
strvec.h	…
sub-process.c	…
sub-process.h	…
submodule-config.c	Merge branch 'sj/submodule-update-clone-config-fix'	2026-05-19 09:57:46 +09:00
submodule-config.h	…
submodule.c	setup: stop using `the_repository` in `is_inside_work_tree()`	2026-05-19 19:36:23 +09:00
submodule.h	…
symlinks.c	…
symlinks.h	…
tag.c	…
tag.h	…
tar.h	…
tempfile.c	…
tempfile.h	…
thread-utils.c	…
thread-utils.h	…
tmp-objdir.c	…
tmp-objdir.h	…
trace.c	…
trace.h	…
trace2.c	…
trace2.h	…
trailer.c	trailer: change strbuf in-place in unfold_value()	2026-05-16 22:11:07 +09:00
trailer.h	…
transport-helper.c	Merge branch 'jk/connect-service-enum'	2026-06-02 16:15:28 +09:00
transport-internal.h	connect: use "service" enum for "name" argument	2026-05-19 15:05:46 +09:00
transport.c	Merge branch 'jk/connect-service-enum'	2026-06-02 16:15:28 +09:00
transport.h	Merge branch 'jk/connect-service-enum'	2026-06-02 16:15:28 +09:00
tree-diff.c	…
tree-walk.c	…
tree-walk.h	…
tree.c	…
tree.h	…
unicode-width.h	…
unimplemented.sh	…
unix-socket.c	…
unix-socket.h	…
unix-stream-server.c	…
unix-stream-server.h	…
unpack-trees.c	…
unpack-trees.h	…
upload-pack.c	*: replace deprecated free_commit_list	2026-05-29 05:11:02 +09:00
upload-pack.h	…
url.c	…
url.h	…
urlmatch.c	…
urlmatch.h	…
usage.c	…
userdiff.c	…
userdiff.h	…
utf8.c	…
utf8.h	…
varint.c	…
varint.h	…
version-def.h.in	…
version.c	…
version.h	…
versioncmp.c	…
versioncmp.h	…
walker.c	…
walker.h	…
wildmatch.c	…
wildmatch.h	…
worktree.c	setup: stop using `the_repository` in `upgrade_repository_format()`	2026-05-19 19:36:25 +09:00
worktree.h	…
wrapper.c	…
wrapper.h	…
write-or-die.c	…
write-or-die.h	…
ws.c	…
ws.h	…
wt-status.c	setup: stop using `the_repository` in `setup_work_tree()`	2026-05-19 19:36:24 +09:00
wt-status.h	…
xdiff-interface.c	…
xdiff-interface.h	…

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.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