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Jeff King 450fc2bace refs: do not clobber dangling symrefs When given an expected "before" state, the ref-writing code will avoid overwriting any ref that does not match that expected state. We use the null oid as a sentinel value for "nothing should exist", and likewise that is the sentinel value we get when trying to read a ref that does not exist. But there's one corner case where this is ambiguous: dangling symrefs. Trying to read them will yield the null oid, but there is potentially something of value there: the dangling symref itself. For a normal recursive write, this is OK. Imagine we have a symref "FOO_HEAD" that points to a ref "refs/heads/bar" that does not exist, and we try to write to it with a create operation like: oid=$(git rev-parse HEAD) ;# or whatever git symbolic-ref FOO_HEAD refs/heads/bar echo "create FOO_HEAD $oid" \| git update-ref --stdin The attempt to resolve FOO_HEAD will actually resolve "bar", yielding the null oid. That matches our expectation, and the write proceeds. This is correct, because we are not writing FOO_HEAD at all, but writing its destination "bar", which in fact does not exist. But what if the operation asked not to dereference symrefs? Like this: echo "create FOO_HEAD $oid" \| git update-ref --no-deref --stdin Resolving FOO_HEAD would still result in a null oid, and the write will proceed. But it will overwrite FOO_HEAD itself, removing the fact that it ever pointed to "bar". This case is a little esoteric; we are clobbering a symref with a no-deref write of a regular ref value. But the same problem occurs when writing symrefs. For example: echo "symref-create FOO_HEAD refs/heads/other" \| git update-ref --no-deref --stdin The "create" operation asked us to create FOO_HEAD only if it did not exist. But we silently overwrite the existing value. You can trigger this without using update-ref via the fetch followRemoteHEAD code. In "create" mode, it should not overwrite an existing value. But if you manually create a symref pointing to a value that does not yet exist (either via symbolic-ref or with "remote add -m"), create mode will happily overwrite it. Instead, we should detect this case and refuse to write. The correct specification to overwrite FOO_HEAD in this case is to provide an expected target ref value, like: echo "symref-update FOO_HEAD refs/heads/other ref refs/heads/bar" \| git update-ref --no-deref --stdin Note that the non-symref "update" directive does not allow you to do this (you can only specify an oid). This is a weakness in the update-ref interface, and you'd have to overwrite unconditionally, like: echo "update FOO_HEAD $oid" \| git update-ref --no-deref --stdin Likewise other symref operations like symref-delete do not accept the "ref" keyword. You should be able to do: echo "symref-delete FOO_HEAD ref refs/heads/bar" but cannot (and can only delete unconditionally). This patch doesn't address those gaps. We may want to do so in a future patch for completeness, but it's not clear if anybody actually wants to perform those operations. The symref update case (specifically, via followRemoteHEAD) is what I ran into in the wild. The code for the fix is relatively straight-forward given the discussion above. But note that we have to implement it independently for the files and reftable backends. The "old oid" checks happen as part of the locking process, which is implemented separately for each system. We may want to factor this out somehow, but it's beyond the scope of this patch. (Another curiosity is that the messages in the reftable code are marked for translation, but the ones in the files backend are not. I followed local convention in each case, but we may want to harmonize this at some point). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2025-08-19 16:06:02 -07:00
.github	Merge branch 'js/github-ci-win-coverity-fix'	2025-06-13 13:29:15 -07:00
Documentation	builtin/reflog: implement subcommand to write new entries	2025-08-06 07:36:30 -07:00
bin-wrappers	…
block-sha1	…
builtin	builtin/reflog: implement subcommand to write new entries	2025-08-06 07:36:30 -07:00
ci	Merge branch 'js/ci-buildsystems-cleanup'	2025-05-13 14:05:06 -07:00
compat	Merge branch 'ss/revert-builtin-bswap-stuff'	2025-06-13 13:29:14 -07:00
compiler-tricks	intialize false_but_the_compiler_does_not_know_it_	2025-05-07 09:11:47 -07:00
contrib	Sync with 2.49.1	2025-06-15 21:54:23 -07:00
ewah	ewah: implement `struct ewah_or_iterator`	2025-03-21 04:34:04 -07:00
git-gui	Sync with 2.49.1	2025-06-15 21:54:23 -07:00
gitk-git	Sync with 2.49.1	2025-06-15 21:54:23 -07:00
gitweb	meson: distinguish build and target host binaries	2025-04-01 02:20:44 -07:00
mergetools	Merge branch 'fr/vimdiff-layout-fixes'	2025-04-08 11:43:16 -07:00
negotiator	prio-queue: use size_t rather than int for size	2024-12-20 07:21:45 -08:00
oss-fuzz	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
perl	Merge branch 'rj/build-tweaks-part2'	2025-05-27 13:59:09 -07:00
po	l10n: zh_TW: update translation for Git 2.50	2025-06-12 22:29:32 +08:00
refs	refs: do not clobber dangling symrefs	2025-08-19 16:06:02 -07:00
reftable	reftable: make REFTABLE_UNUSED C99 compatible	2025-05-29 09:18:53 -07:00
sha1	…
sha1collisiondetection@855827c583	…
sha1dc	…
sha256	…
subprojects	…
t	refs: do not clobber dangling symrefs	2025-08-19 16:06:02 -07:00
templates	meson: distinguish build and target host binaries	2025-04-01 02:20:44 -07:00
trace2	trace2: avoid "futile conditional"	2025-05-15 13:46:47 -07:00
xdiff	xdiff: disable cleanup_records heuristic with --minimal	2025-04-29 12:46:58 -07:00
.cirrus.yml	…
.clang-format	…
.editorconfig	editorconfig: add .bash extension	2025-03-03 08:39:47 -08:00
.gitattributes	git-gui: wire up support for the Meson build system	2025-05-13 08:48:09 +02:00
.gitignore	git-gui: replace GIT-GUI-VARS with GIT-GUI-BUILD-OPTIONS	2025-05-13 08:27:09 +02:00
.gitlab-ci.yml	Merge branch 'ps/ci-gitlab-enable-msvc-meson-job'	2025-05-23 15:34:08 -07:00
.gitmodules	…
.mailmap	…
.tsan-suppressions	…
CODE_OF_CONDUCT.md	…
COPYING	…
GIT-BUILD-OPTIONS.in	GIT-BUILD-OPTIONS: propagate project's source directory	2025-02-18 11:40:02 -08:00
GIT-VERSION-FILE.in	…
GIT-VERSION-GEN	Git 2.50.1	2025-06-15 21:57:08 -07:00
INSTALL	…
LGPL-2.1	…
Makefile	Merge branch 'jk/no-funny-object-types'	2025-05-27 13:59:08 -07:00
README.md	README: .txt -> .adoc fixes	2025-03-03 13:49:19 -08:00
RelNotes	Git 2.50.1	2025-06-15 21:57:08 -07:00
SECURITY.md	…
abspath.c	…
abspath.h	…
aclocal.m4	…
add-interactive.c	…
add-interactive.h	…
add-patch.c	…
advice.c	advice: allow disabling default branch name advice	2025-03-25 16:09:28 -07:00
advice.h	advice: allow disabling default branch name advice	2025-03-25 16:09:28 -07:00
alias.c	…
alias.h	…
alloc.c	…
alloc.h	…
apply.c	apply: set file mode when --reverse creates a deleted file	2025-05-27 06:48:07 -07:00
apply.h	…
archive-tar.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
archive-zip.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
archive.c	Merge branch 'ps/parse-options-integers'	2025-04-24 17:25:34 -07:00
archive.h	…
attr.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
attr.h	…
banned.h	…
base85.c	…
base85.h	…
bisect.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
bisect.h	…
blame.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
blame.h	…
blob.c	…
blob.h	…
bloom.c	…
bloom.h	…
branch.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
branch.h	…
builtin.h	Merge branch 'jt/diff-pairs'	2025-03-26 16:26:09 +09:00
bulk-checkin.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
bulk-checkin.h	object-file: drop `index_blob_stream()`	2025-04-15 08:24:36 -07:00
bundle-uri.c	Sync with 2.49.1	2025-06-15 21:54:23 -07:00
bundle-uri.h	…
bundle.c	Merge branch 'ps/object-file-cleanup'	2025-04-24 17:25:33 -07:00
bundle.h	bundle: avoid closing file descriptor twice	2025-01-25 18:38:11 -08:00
cache-tree.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
cache-tree.h	…
cbtree.c	…
cbtree.h	…
chdir-notify.c	…
chdir-notify.h	…
check-builtins.sh	…
checkout.c	…
checkout.h	…
chunk-format.c	…
chunk-format.h	…
color.c	…
color.h	…
column.c	…
column.h	…
combine-diff.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
command-list.txt	builtin: introduce diff-pairs command	2025-03-03 08:17:47 -08:00
commit-graph.c	Merge branch 'js/misc-fixes'	2025-05-27 13:59:11 -07:00
commit-graph.h	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
commit-reach.c	commit-reach: use `size_t` to track indices when computing merge bases	2024-12-27 08:12:40 -08:00
commit-reach.h	commit-reach: use `size_t` to track indices when computing merge bases	2024-12-27 08:12:40 -08:00
commit-slab-decl.h	…
commit-slab-impl.h	…
commit-slab.h	…
commit.c	Merge branch 'ps/object-file-cleanup'	2025-04-24 17:25:33 -07:00
commit.h	commit-reach: use `size_t` to track indices in `get_reachable_subset()`	2024-12-27 08:11:45 -08:00
common-exit.c	common-main: split init and exit code into new files	2025-01-28 14:39:16 -08:00
common-init.c	common-main: split init and exit code into new files	2025-01-28 14:39:16 -08:00
common-init.h	common-main: split init and exit code into new files	2025-01-28 14:39:16 -08:00
common-main.c	common-main: split init and exit code into new files	2025-01-28 14:39:16 -08:00
config.c	Sync with 2.49.1	2025-06-15 21:54:23 -07:00
config.h	config: teach repo_config to allow `repo` to be NULL	2025-03-07 16:52:00 -08:00
config.mak.dev	Merge branch 'js/comma-semicolon-confusion'	2025-04-15 13:50:17 -07:00
config.mak.in	…
config.mak.uname	Merge branch 'bs/config-mak-openbsd'	2025-06-04 14:30:28 -07:00
configure.ac	configure.ac: upgrade to a compilation check for sysinfo	2025-05-19 11:34:00 -07:00
connect.c	Merge branch 'cc/lop-remote'	2025-03-05 10:37:44 -08:00
connect.h	…
connected.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
connected.h	…
convert.c	object-store: move function declarations to their respective subsystems	2025-04-29 10:08:12 -07:00
convert.h	…
copy.c	path: adjust last remaining users of `the_repository`	2025-02-28 13:54:11 -08:00
copy.h	…
credential.c	Merge branch 'ps/the-repository'	2025-01-21 08:44:54 -08:00
credential.h	Merge branch 'ps/the-repository'	2025-01-21 08:44:54 -08:00
csum-file.c	csum-file: stop depending on `the_repository`	2025-03-10 13:16:18 -07:00
csum-file.h	csum-file: stop depending on `the_repository`	2025-03-10 13:16:18 -07:00
ctype.c	…
daemon.c	Merge branch 'ps/build-sign-compare'	2024-12-23 09:32:11 -08:00
date.c	date.c: Fix type missmatch warings from msvc	2024-12-26 13:34:28 -08:00
date.h	…
decorate.c	decorate: fix sign comparison warnings	2025-03-10 13:21:13 -07:00
decorate.h	…
delta-islands.c	delta-islands: stop depending on `the_repository`	2025-03-10 13:16:20 -07:00
delta-islands.h	delta-islands: stop depending on `the_repository`	2025-03-10 13:16:20 -07:00
delta.h	…
detect-compiler	detect-compiler: detect clang even if it found CUDA	2025-03-28 17:38:12 -07:00
diagnose.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
diagnose.h	…
diff-delta.c	diff-delta: avoid using the comma operator	2025-03-28 17:38:10 -07:00
diff-lib.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
diff-merges.c	…
diff-merges.h	…
diff-no-index.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
diff.c	Merge branch 'js/diff-codeql-false-positive-workaround'	2025-05-08 12:36:32 -07:00
diff.h	Merge branch 'ps/object-wo-the-repository'	2025-04-15 13:50:15 -07:00
diffcore-break.c	…
diffcore-delta.c	…
diffcore-order.c	…
diffcore-pickaxe.c	…
diffcore-rename.c	object-store: move function declarations to their respective subsystems	2025-04-29 10:08:12 -07:00
diffcore-rotate.c	…
diffcore.h	diffcore.h: .txt -> .adoc fixes	2025-03-03 13:49:23 -08:00
dir-iterator.c	refs/iterator: separate lifecycle from iteration	2025-03-12 11:31:18 -07:00
dir-iterator.h	refs/iterator: separate lifecycle from iteration	2025-03-12 11:31:18 -07:00
dir.c	Merge branch 'kj/glob-path-with-special-char'	2025-05-13 14:05:07 -07:00
dir.h	Merge branch 'am/dir-dedup-decl-of-repository'	2025-03-29 16:39:09 +09:00
editor.c	path: refactor `repo_git_path()` family of functions	2025-02-07 09:59:21 -08:00
editor.h	…
entry.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
entry.h	…
environment.c	Merge branch 'js/windows-arm64'	2025-05-05 14:56:24 -07:00
environment.h	Merge branch 'ab/environment-clean-header'	2025-04-17 10:28:20 -07:00
exec-cmd.c	…
exec-cmd.h	…
fetch-negotiator.c	…
fetch-negotiator.h	…
fetch-pack.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
fetch-pack.h	…
fmt-merge-msg.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
fmt-merge-msg.h	…
fsck.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
fsck.h	packed-backend: fsck should warn when "packed-refs" file is empty	2025-05-14 12:32:58 -07:00
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	…
generate-cmdlist.sh	doc: use .adoc extension for AsciiDoc files	2025-01-21 12:56:06 -08:00
generate-configlist.sh	Merge branch 'jc/sed-build-fixes'	2025-06-13 13:29:14 -07:00
generate-hooklist.sh	doc: use .adoc extension for AsciiDoc files	2025-01-21 12:56:06 -08:00
generate-perl.sh	…
generate-python.sh	…
generate-script.sh	…
gettext.c	…
gettext.h	…
git-archimport.perl	…
git-compat-util.h	midx repack: avoid integer overflow on 32 bit systems	2025-05-22 14:48:36 -07:00
git-curl-compat.h	http.c: allow custom TCP keepalive behavior via config	2025-03-21 01:38:52 -07:00
git-cvsexportcommit.perl	…
git-cvsimport.perl	…
git-cvsserver.perl	cvsserver: remove unused escapeRefName function	2025-05-27 08:25:08 -07:00
git-difftool--helper.sh	…
git-filter-branch.sh	filter-branch: stop depending on Perl	2025-04-16 07:30:29 -07:00
git-instaweb.sh	instaweb: fix ip binding for the python http.server	2025-01-10 15:27:52 -08:00
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	request-pull: stop depending on Perl	2025-04-16 07:30:29 -07:00
git-send-email.perl	Merge branch 'ag/send-email-hostname-f'	2025-05-23 15:34:08 -07:00
git-sh-i18n.sh	…
git-sh-setup.sh	…
git-submodule.sh	…
git-svn.perl	…
git-web--browse.sh	…
git-zlib.c	Merge branch 'jk/zlib-inflate-fixes'	2025-04-15 13:50:14 -07:00
git-zlib.h	git-zlib: use `struct z_stream_s` instead of typedef	2025-04-07 14:53:11 -07:00
git.c	builtin: introduce diff-pairs command	2025-03-03 08:17:47 -08:00
git.rc.in	…
gpg-interface.c	…
gpg-interface.h	…
graph.c	…
graph.h	…
grep.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
grep.h	…
hash-lookup.c	…
hash-lookup.h	…
hash.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
hash.h	Merge branch 'jt/help-sha-backend-info-in-build-options'	2025-04-16 13:54:20 -07:00
hashmap.c	Merge branch 'en/hashmap-clear-fix'	2025-05-08 12:36:31 -07:00
hashmap.h	…
help.c	Avoid redundant conditions	2025-05-15 13:46:47 -07:00
help.h	…
hex-ll.c	…
hex-ll.h	…
hex.c	…
hex.h	…
hook.c	path: refactor `repo_git_path()` family of functions	2025-02-07 09:59:21 -08:00
hook.h	…
http-backend.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
http-fetch.c	…
http-push.c	curl: pass `long` values where expected	2025-06-06 08:12:24 -07:00
http-walker.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
http.c	curl: pass `long` values where expected	2025-06-06 08:12:24 -07:00
http.h	hash: stop typedeffing the hash context	2025-01-31 10:06:10 -08:00
ident.c	ident: fix type of string length parameter	2025-08-06 07:36:30 -07:00
ident.h	ident: fix type of string length parameter	2025-08-06 07:36:30 -07:00
imap-send.c	curl: fix integer variable typechecks with curl_easy_setopt()	2025-06-04 14:17:53 -07:00
iterator.h	refs/iterator: separate lifecycle from iteration	2025-03-12 11:31:18 -07:00
json-writer.c	json-writer: add docstrings to jw_* functions	2025-05-16 09:33:06 -07:00
json-writer.h	json-writer: describe the usage of jw_* functions	2025-05-16 09:33:07 -07:00
khash.h	…
kwset.c	kwset: avoid using the comma operator unnecessarily	2025-03-28 17:38:09 -07:00
kwset.h	…
levenshtein.c	…
levenshtein.h	…
line-log.c	…
line-log.h	…
line-range.c	…
line-range.h	…
linear-assignment.c	…
linear-assignment.h	…
list-objects-filter-options.c	…
list-objects-filter-options.h	list-objects-filter-options.h: .txt -> .adoc fixes	2025-03-03 13:49:23 -08:00
list-objects-filter.c	oidmap: rename oidmap_free() to oidmap_clear()	2025-05-12 13:06:26 -07:00
list-objects-filter.h	…
list-objects.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
list-objects.h	…
list.h	…
lockfile.c	…
lockfile.h	…
log-tree.c	object-store: move function declarations to their respective subsystems	2025-04-29 10:08:12 -07:00
log-tree.h	…
loose.c	path: adjust last remaining users of `the_repository`	2025-02-28 13:54:11 -08:00
loose.h	…
ls-refs.c	…
ls-refs.h	…
mailinfo.c	mailinfo: fix pointential memory leak if `decode_header` failed	2025-05-15 13:50:18 -07:00
mailinfo.h	…
mailmap.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
mailmap.h	…
match-trees.c	object-file: split out functions relating to object store subsystem	2025-04-15 08:24:36 -07:00
match-trees.h	…
mem-pool.c	…
mem-pool.h	…
merge-blobs.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
merge-blobs.h	…
merge-ll.c	…
merge-ll.h	…
merge-ort-wrappers.c	merge-ort: support having merge verbosity be set to 0	2025-03-18 09:48:51 -07:00
merge-ort-wrappers.h	merge-recursive.[ch]: thoroughly debug these	2025-04-08 13:59:13 -07:00
merge-ort.c	merge-ort: add a new mergeability_only option	2025-05-16 15:09:14 -07:00
merge-ort.h	merge-ort: add a new mergeability_only option	2025-05-16 15:09:14 -07:00
merge.c	…
merge.h	…
mergesort.h	…
meson.build	Merge branch 'es/meson-configure-build-options-fix'	2025-05-27 13:59:12 -07:00
meson_options.txt	Merge branch 'rj/build-tweaks-part2'	2025-05-27 13:59:09 -07:00
midx-write.c	midx: avoid negative array index	2025-05-22 14:48:37 -07:00
midx.c	midx: stop repeatedly looking up nonexistent packfiles	2025-05-28 07:56:29 -07:00
midx.h	…
name-hash.c	name-hash: don't add sparse directories in threaded lazy init	2025-05-21 14:51:08 -07:00
name-hash.h	…
notes-cache.c	object-file: split out functions relating to object store subsystem	2025-04-15 08:24:36 -07:00
notes-cache.h	…
notes-merge.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
notes-merge.h	…
notes-utils.c	…
notes-utils.h	…
notes.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
notes.h	…
object-file-convert.c	object-file-convert: stop depending on `the_repository`	2025-03-10 13:16:19 -07:00
object-file-convert.h	object-file-convert: stop depending on `the_repository`	2025-03-10 13:16:19 -07:00
object-file.c	object-file: drop support for writing objects with unknown types	2025-05-16 09:43:12 -07:00
object-file.h	object-file: drop support for writing objects with unknown types	2025-05-16 09:43:12 -07:00
object-name.c	object-store: move function declarations to their respective subsystems	2025-04-29 10:08:12 -07:00
object-name.h	object-name: introduce `repo_get_oid_with_flags()`	2025-03-12 11:31:16 -07:00
object-store.c	Merge branch 'jk/no-funny-object-types'	2025-05-27 13:59:08 -07:00
object-store.h	Merge branch 'jk/no-funny-object-types'	2025-05-27 13:59:08 -07:00
object.c	Merge branch 'ps/object-file-cleanup'	2025-04-24 17:25:33 -07:00
object.h	Merge branch 'kn/bundle-dedup-optim'	2025-04-23 13:58:50 -07:00
oid-array.c	…
oid-array.h	…
oidmap.c	oidmap: rename oidmap_free() to oidmap_clear()	2025-05-12 13:06:26 -07:00
oidmap.h	oidmap: add size function	2025-05-12 13:06:26 -07:00
oidset.c	…
oidset.h	…
oidtree.c	…
oidtree.h	…
pack-bitmap-write.c	Merge branch 'ps/object-file-cleanup'	2025-04-24 17:25:33 -07:00
pack-bitmap.c	pack-bitmap: fix memory leak if `load_bitmap_entries_v1` failed	2025-05-12 10:58:35 -07:00
pack-bitmap.h	Merge branch 'ps/cat-file-filter-batch'	2025-04-16 13:54:21 -07:00
pack-check.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
pack-mtimes.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
pack-mtimes.h	…
pack-objects.c	…
pack-objects.h	object-store: move `struct packed_git` into "packfile.h"	2025-04-29 10:08:11 -07:00
pack-revindex.c	Merge branch 'ps/object-file-cleanup'	2025-04-24 17:25:33 -07:00
pack-revindex.h	…
pack-write.c	pack-write: stop depending on `the_repository` and `the_hash_algo`	2025-03-10 13:16:18 -07:00
pack.h	pack-write: stop depending on `the_repository` and `the_hash_algo`	2025-03-10 13:16:18 -07:00
packfile.c	Merge branch 'ps/midx-negative-packfile-cache'	2025-05-30 11:59:18 -07:00
packfile.h	object-store: move function declarations to their respective subsystems	2025-04-29 10:08:12 -07:00
pager.c	…
pager.h	…
parallel-checkout.c	treewide: replace assert() with ASSERT() in special cases	2025-03-21 03:32:10 -07:00
parallel-checkout.h	…
parse-options-cb.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
parse-options.c	parse-options: introduce precision handling for `OPTION_UNSIGNED`	2025-04-17 08:15:16 -07:00
parse-options.h	parse-options: detect mismatches in integer signedness	2025-04-17 08:15:16 -07:00
parse.c	parse-options: introduce precision handling for `OPTION_UNSIGNED`	2025-04-17 08:15:16 -07:00
parse.h	parse-options: introduce precision handling for `OPTION_UNSIGNED`	2025-04-17 08:15:16 -07:00
patch-delta.c	…
patch-ids.c	…
patch-ids.h	…
path-walk.c	backfill: add --sparse option	2025-02-03 16:12:42 -08:00
path-walk.h	backfill: add --sparse option	2025-02-03 16:12:42 -08:00
path.c	object-store: move and rename `odb_pack_keep()`	2025-04-29 10:08:12 -07:00
path.h	object-store: move and rename `odb_pack_keep()`	2025-04-29 10:08:12 -07:00
pathspec.c	pathspec: fix sign comparison warnings	2025-04-01 02:51:47 -07:00
pathspec.h	…
pkt-line.c	…
pkt-line.h	…
preload-index.c	…
preload-index.h	…
pretty.c	…
pretty.h	…
prio-queue.c	prio-queue: use size_t rather than int for size	2024-12-20 07:21:45 -08:00
prio-queue.h	prio-queue: fix type of `insertion_ctr`	2024-12-27 08:10:41 -08:00
progress.c	…
progress.h	…
promisor-remote.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
promisor-remote.h	Add 'promisor-remote' capability to protocol v2	2025-02-18 11:05:37 -08:00
prompt.c	…
prompt.h	…
protocol-caps.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
protocol-caps.h	…
protocol.c	…
protocol.h	…
prune-packed.c	object-store: move function declarations to their respective subsystems	2025-04-29 10:08:12 -07:00
prune-packed.h	…
pseudo-merge.c	…
pseudo-merge.h	Merge branch 'tb/bitamp-typofix'	2025-04-07 14:23:20 -07:00
quote.c	…
quote.h	…
range-diff.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
range-diff.h	…
reachable.c	object-store: move function declarations to their respective subsystems	2025-04-29 10:08:12 -07:00
reachable.h	…
read-cache-ll.h	…
read-cache.c	has_dir_name(): make code more obvious	2025-05-15 13:46:46 -07:00
read-cache.h	…
rebase-interactive.c	…
rebase-interactive.h	…
rebase.c	…
rebase.h	…
ref-filter.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
ref-filter.h	global: use designated initializers for options	2025-04-17 08:15:15 -07:00
reflog-walk.c	…
reflog-walk.h	…
reflog.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
reflog.h	builtin/reflog: make functions regarding `reflog_expire_options` public	2025-04-08 07:53:27 -07:00
refs.c	refs: fix invalid old object IDs when migrating reflogs	2025-08-06 07:36:31 -07:00
refs.h	refs: fix invalid old object IDs when migrating reflogs	2025-08-06 07:36:31 -07:00
refspec.c	refspec: replace `refspec_item_init()` with fetch/push variants	2025-03-21 01:45:16 -07:00
refspec.h	refspec: replace `refspec_item_init()` with fetch/push variants	2025-03-21 01:45:16 -07:00
remote-curl.c	curl: pass `long` values where expected	2025-06-06 08:12:24 -07:00
remote.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
remote.h	remote: allow `guess_remote_head()` to suppress advice	2025-03-25 16:09:27 -07:00
replace-object.c	raw_object_store: drop extra pointer to replace_map	2025-05-12 13:06:27 -07:00
replace-object.h	raw_object_store: drop extra pointer to replace_map	2025-05-12 13:06:27 -07:00
repo-settings.c	environment: move access to "core.bigFileThreshold" into repo settings	2025-03-10 13:16:18 -07:00
repo-settings.h	environment: move access to "core.bigFileThreshold" into repo settings	2025-03-10 13:16:18 -07:00
repository.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
repository.h	…
rerere.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
rerere.h	rerere: let `rerere_path()` write paths into a caller-provided buffer	2025-02-28 13:54:11 -08:00
reset.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
reset.h	…
resolve-undo.c	…
resolve-undo.h	…
revision.c	Merge branch 'ps/object-file-cleanup'	2025-04-24 17:25:33 -07:00
revision.h	Merge branch 'lo/remove-log-reencode-from-rev-info'	2025-04-29 14:21:31 -07:00
run-command.c	git-compat-util: add NOT_CONSTANT macro and use it in atfork_prepare()	2025-03-17 17:30:49 -07:00
run-command.h	…
sane-ctype.h	…
scalar.c	scalar reconfigure: improve --maintenance docs	2025-05-14 12:18:12 -07:00
send-pack.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
send-pack.h	send-pack: new return code "ERROR_SEND_PACK_BAD_REF_STATUS"	2025-02-03 15:24:57 -08:00
sequencer.c	Merge branch 'en/sequencer-comment-messages'	2025-05-27 13:59:11 -07:00
sequencer.h	…
serve.c	Add 'promisor-remote' capability to protocol v2	2025-02-18 11:05:37 -08:00
serve.h	…
server-info.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
server-info.h	…
setup.c	Merge branch 'tz/doc-txt-to-adoc-fixes'	2025-03-06 14:06:31 -08:00
setup.h	…
sh-i18n--envsubst.c	…
sha1dc_git.c	…
sha1dc_git.h	…
shallow.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
shallow.h	shallow: fix -Wsign-compare warnings	2024-12-27 08:12:40 -08:00
shared.mak	GIT-VERSION-GEN: fix overriding GIT_BUILT_FROM_COMMIT and GIT_DATE	2024-12-20 12:36:45 -08:00
shell.c	…
shortlog.h	…
sideband.c	…
sideband.h	…
sigchain.c	…
sigchain.h	…
simple-ipc.h	simple-ipc.h: .txt -> .adoc fixes	2025-03-03 13:49:25 -08:00
sparse-index.c	…
sparse-index.h	…
split-index.c	…
split-index.h	…
stable-qsort.c	…
statinfo.c	…
statinfo.h	…
strbuf.c	Git 2.47.2	2025-01-13 12:55:26 -08:00
strbuf.h	Git 2.47.2	2025-01-13 12:55:26 -08:00
streaming.c	object-file: drop OBJECT_INFO_ALLOW_UNKNOWN_TYPE flag	2025-05-16 09:43:10 -07:00
streaming.h	…
string-list.c	…
string-list.h	…
strmap.c	…
strmap.h	…
strvec.c	Merge branch 'ps/build-sign-compare'	2024-12-23 09:32:11 -08:00
strvec.h	…
sub-process.c	…
sub-process.h	…
submodule-config.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
submodule-config.h	…
submodule.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
submodule.h	submodule: refactor `submodule_to_gitdir()` to accept a repo	2025-02-07 09:59:21 -08:00
symlinks.c	…
symlinks.h	…
tag.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
tag.h	…
tar.h	…
tempfile.c	path: adjust last remaining users of `the_repository`	2025-02-28 13:54:11 -08:00
tempfile.h	…
thread-utils.c	thread-utils.c: detect online CPU count on OpenBSD / NetBSD	2025-06-01 17:15:13 -07:00
thread-utils.h	Revert barrier-based LSan threading race workaround	2025-01-01 14:13:01 -08:00
tmp-objdir.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
tmp-objdir.h	…
trace.c	…
trace.h	…
trace2.c	Merge branch 'am/trace2-with-valueless-true'	2025-01-29 14:05:10 -08:00
trace2.h	trace2.h: .txt -> .adoc fixes	2025-03-03 13:49:26 -08:00
trailer.c	…
trailer.h	…
transport-helper.c	Avoid redundant conditions	2025-05-15 13:46:47 -07:00
transport-internal.h	…
transport.c	Merge branch 'ps/send-pack-unhide-error-in-atomic-push'	2025-02-18 15:30:32 -08:00
transport.h	transport.h: .txt -> .adoc fixes	2025-03-03 13:49:27 -08:00
tree-diff.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
tree-walk.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
tree-walk.h	tree-walk.h: fix incorrect API comment	2025-05-02 12:44:04 -07:00
tree.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
tree.h	…
unicode-width.h	…
unimplemented.sh	…
unix-socket.c	Merge branch 'ps/leakfixes-0129'	2025-02-06 14:56:45 -08:00
unix-socket.h	…
unix-stream-server.c	…
unix-stream-server.h	…
unpack-trees.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
unpack-trees.h	…
upload-pack.c	upload-pack: rename `enum` to reflect the operation	2025-05-15 13:46:46 -07:00
upload-pack.h	…
url.c	…
url.h	…
urlmatch.c	…
urlmatch.h	…
usage.c	usage: add show_usage_if_asked()	2025-01-17 13:30:02 -08:00
userdiff.c	userdiff: extend Bash pattern to cover more shell function forms	2025-05-16 11:52:41 -07:00
userdiff.h	…
utf8.c	…
utf8.h	…
varint.c	…
varint.h	…
version-def.h.in	…
version.c	Merge branch 'ua/os-version-capability'	2025-02-27 15:23:00 -08:00
version.h	agent: advertise OS name via agent capability	2025-02-19 09:48:37 -08:00
versioncmp.c	…
versioncmp.h	…
walker.c	treewide: convert users of `repo_has_object_file()` to `has_object()`	2025-04-29 10:08:13 -07:00
walker.h	…
wildmatch.c	wildmatch: avoid using of the comma operator	2025-03-28 17:38:11 -07:00
wildmatch.h	…
worktree.c	Merge branch 'sj/ref-consistency-checks-more'	2025-03-26 16:26:10 +09:00
worktree.h	Merge branch 'sj/ref-consistency-checks-more'	2025-03-26 16:26:10 +09:00
wrapper.c	Merge branch 'cf/wrapper-bsd-eloop'	2025-05-15 17:24:55 -07:00
wrapper.h	wrapper: allow generating insecure random bytes	2025-01-07 09:04:18 -08:00
write-or-die.c	…
write-or-die.h	…
ws.c	…
ws.h	…
wt-status.c	hash: stop depending on `the_repository` in `null_oid()`	2025-03-10 13:16:20 -07:00
wt-status.h	…
xdiff-interface.c	object-store: merge "object-store-ll.h" and "object-store.h"	2025-04-15 08:24:37 -07:00
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