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Jeff King 6479ea4a8a xrealloc: do not reuse pointer freed by zero-length realloc() 
This patch fixes a bug where xrealloc(ptr, 0) can double-free and
corrupt the heap on some platforms (including at least glibc).

The C99 standard says of malloc (section 7.20.3):

  If the size of the space requested is zero, the behavior is
  implementation-defined: either a null pointer is returned, or the
  behavior is as if the size were some nonzero value, except that the
  returned pointer shall not be used to access an object.

So we might get NULL back, or we might get an actual pointer (but we're
not allowed to look at its contents). To simplify our code, our
xmalloc() handles a NULL return by converting it into a single-byte
allocation. That way callers get consistent behavior. This was done way
back in 4e7a2eccc2 (?alloc: do not return NULL when asked for zero
bytes, 2005-12-29).

We also gave xcalloc() and xrealloc() the same treatment. And according
to C99, that is fine; the text above is in a paragraph that applies to
all three. But what happens to the memory we passed to realloc() in such
a case? I.e., if we do:

  ret = realloc(ptr, 0);

and "ptr" is non-NULL, but we get NULL back, is "ptr" still valid? C99
doesn't cover this case specifically, but says (section 7.20.3.4):

  The realloc function deallocates the old object pointed to by ptr and
  returns a pointer to a new object that has the size specified by size.

So "ptr" is now deallocated, and we must only look at "ret". And since
"ret" is NULL, that means we have no allocated object at all. But that's
not quite the whole story. It also says:

  If memory for the new object cannot be allocated, the old object is
  not deallocated and its value is unchanged.
  [...]
  The realloc function returns a pointer to the new object (which may
  have the same value as a pointer to the old object), or a null pointer
  if the new object could not be allocated.

So if we see a NULL return with a non-zero size, we can expect that the
original object _is_ still valid. But with a non-zero size, it's
ambiguous. The NULL return might mean a failure (in which case the
object is valid), or it might mean that we successfully allocated
nothing, and used NULL to represent that.

The glibc manpage for realloc() explicitly says:

  [...]if size is equal to zero, and ptr is not NULL, then the call is
  equivalent to free(ptr).

Likewise, this StackOverflow answer:

  https://stackoverflow.com/a/2135302

claims that C89 gave similar guidance (but I don't have a copy to verify
it). A comment on this answer:

  https://stackoverflow.com/a/2022410

claims that Microsoft's CRT behaves the same.

But our current "retry with 1 byte" code passes the original pointer
again. So on glibc, we effectively free() the pointer and then try to
realloc() it again, which is undefined behavior.

The simplest fix here is to just pass "ret" (which we know to be NULL)
to the follow-up realloc(). But that means that a system which _doesn't_
free the original pointer would leak it. It's not clear if any such
systems exist, and that interpretation of the standard seems unlikely
(I'd expect a system that doesn't deallocate to simply return the
original pointer in this case). But it's easy enough to err on the safe
side, and just never pass a zero size to realloc() at all.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
 		2020-09-02 12:18:14 -07:00
.github Merge branch 'es/advertise-contribution-doc' 2020-06-17 21:54:06 -07:00
Documentation Merge branch 'ps/ref-transaction-hook' into master 2020-07-24 15:54:06 -07:00
block-sha1
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builtin Merge branch 'tb/commit-graph-no-check-oids' into master 2020-07-15 16:29:45 -07:00
ci Merge branch 'jk/ci-only-on-selected-branches' 2020-05-29 15:12:19 -07:00
compat Merge branch 'js/msvc-build-fix' 2020-06-17 21:54:03 -07:00
contrib Merge branch 'en/sparse-status' into master 2020-07-21 14:19:10 -07:00
ewah Merge branch 'jk/object-filter-with-bitmap' 2020-03-02 15:07:18 -08:00
git-gui Merge https://github.com/prati0100/git-gui into master 2020-07-20 12:04:06 -07:00
gitk-git
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gitweb Merge branch 'eb/gitweb-more-trailers' 2020-05-01 13:39:56 -07:00
mergetools
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negotiator
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perl perl: make SVN code hash independent 2020-06-22 11:21:07 -07:00
po Merge branch 'master' of github.com:Softcatala/git-po 2020-07-27 00:05:41 +08:00
ppc
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refs refs: improve documentation for ref iterator 2020-05-20 10:39:02 -07:00
sha1collisiondetection@855827c583
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sha1dc
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sha256 hash: implement and use a context cloning function 2020-02-24 09:33:21 -08:00
t Merge branch 'dl/branch-cleanup' into master 2020-07-18 16:35:22 -07:00
templates
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trace2 trace2: teach Git to log environment variables 2020-03-23 13:14:53 -07:00
vcs-svn
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xdiff
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.cirrus.yml
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.clang-format
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.editorconfig
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.gitattributes
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.gitignore Merge branch 'es/bugreport' 2020-05-01 13:39:59 -07:00
.gitmodules
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.mailmap Merge branch 'bc/wildcard-credential' 2020-03-05 10:43:02 -08:00
.travis.yml ci: fix the `jobname` of the `GETTEXT_POISON` job 2020-04-07 22:17:10 -07:00
.tsan-suppressions
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CODE_OF_CONDUCT.md
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COPYING
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GIT-VERSION-GEN Git 2.28 2020-07-26 18:01:43 -07:00
INSTALL INSTALL: drop support for docbook-xsl before 1.74 2020-03-29 09:25:38 -07:00
LGPL-2.1
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Makefile Merge branch 'lo/sparse-universal-zero-init' 2020-06-02 13:35:04 -07:00
README.md ci: retire the Azure Pipelines definition 2020-04-10 10:30:40 -07:00
RelNotes Start the post 2.27 cycle 2020-06-02 13:35:05 -07:00
abspath.c real_path_if_valid(): remove unsafe API 2020-03-10 11:41:40 -07:00
aclocal.m4
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add-interactive.c interactive: refactor code asking the user for interactive input 2020-04-10 10:26:31 -07:00
add-interactive.h
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add-patch.c Merge branch 'js/checkout-p-new-file' 2020-06-08 18:06:31 -07:00
advice.c Merge branch 'hw/advise-ng' 2020-03-25 13:57:41 -07:00
advice.h Merge branch 'hw/advise-ng' 2020-03-25 13:57:41 -07:00
alias.c
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alias.h
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alloc.c commit: move members graph_pos, generation to a slab 2020-06-17 14:37:30 -07:00
alloc.h object: drop parsed_object_pool->commit_count 2020-06-17 14:37:14 -07:00
apply.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
apply.h
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archive-tar.c parse_config_key(): return subsection len as size_t 2020-04-10 14:44:29 -07:00
archive-zip.c
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archive.c convert: provide additional metadata to filters 2020-03-16 11:37:02 -07:00
archive.h convert: provide additional metadata to filters 2020-03-16 11:37:02 -07:00
argv-array.c
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argv-array.h
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attr.c
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attr.h
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banned.h
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base85.c
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bisect.c bisect: stop referring to sha1_array 2020-03-30 10:59:08 -07:00
bisect.h
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blame.c commit: move members graph_pos, generation to a slab 2020-06-17 14:37:30 -07:00
blame.h blame: use changed-path Bloom filters 2020-04-16 15:38:06 -07:00
blob.c object: drop parsed_object_pool->commit_count 2020-06-17 14:37:14 -07:00
blob.h
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bloom.c commit-graph: minimize commit_graph_data_slab access 2020-06-17 14:37:52 -07:00
bloom.h Merge branch 'ds/line-log-on-bloom' 2020-06-08 18:06:26 -07:00
branch.c Merge branch 'es/get-worktrees-unsort' 2020-07-06 22:09:15 -07:00
branch.h
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bugreport.c Merge branch 'rs/retire-strbuf-write-fd' 2020-06-29 14:17:26 -07:00
builtin.h Lib-ify prune-packed 2020-03-24 15:04:44 -07:00
bulk-checkin.c
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bulk-checkin.h
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bundle.c bundle: detect hash algorithm when reading refs 2020-06-19 14:04:09 -07:00
bundle.h bundle: detect hash algorithm when reading refs 2020-06-19 14:04:09 -07:00
cache-tree.c
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cache-tree.h
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cache.h Merge branch 'jn/v0-with-extensions-fix' into master 2020-07-16 17:58:42 -07:00
chdir-notify.c
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chdir-notify.h
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check-builtins.sh
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check_bindir
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checkout.c
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checkout.h
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color.c
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color.h
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column.c
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column.h
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combine-diff.c oid_array: rename source file from sha1-array 2020-03-30 10:59:08 -07:00
command-list.txt bash-completion: add git-prune into bash completion 2020-06-22 11:29:38 -07:00
commit-graph.c Merge branch 'sg/commit-graph-progress-fix' into master 2020-07-15 16:29:43 -07:00
commit-graph.h commit-graph: introduce commit_graph_data_slab 2020-06-17 14:37:23 -07:00
commit-reach.c Merge branch 'cb/is-descendant-of' 2020-07-06 22:09:16 -07:00
commit-reach.h commit-reach: avoid is_descendant_of() shim 2020-06-23 16:36:53 -07:00
commit-slab-decl.h commit-slab-decl.h: update include guard 2020-05-18 10:33:00 -07:00
commit-slab-impl.h
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commit-slab.h commit-slab: clarify slabname##_peek()'s return value 2020-03-10 11:44:24 -07:00
commit.c Merge branch 'tb/fix-persistent-shallow' into master 2020-07-09 14:00:44 -07:00
commit.h commit: move members graph_pos, generation to a slab 2020-06-17 14:37:30 -07:00
common-main.c
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config.c config: reject parsing of files over INT_MAX 2020-04-10 14:58:21 -07:00
config.h git_config_parse_key(): return baselen as size_t 2020-04-10 14:52:22 -07:00
config.mak.dev Merge branch 'bc/sha-256-part-1-of-4' 2020-03-26 17:11:20 -07:00
config.mak.in
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config.mak.uname Merge branch 'cb/no-more-gmtime' 2020-05-20 08:33:27 -07:00
configure.ac
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connect.c Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
connect.h Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
connected.c fetch-pack: support more than one pack lockfile 2020-06-10 18:06:34 -07:00
connected.h connected: always use partial clone optimization 2020-03-29 10:37:44 -07:00
convert.c parse_config_key(): return subsection len as size_t 2020-04-10 14:44:29 -07:00
convert.h convert: provide additional metadata to filters 2020-03-16 11:37:02 -07:00
copy.c
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credential-cache--daemon.c
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credential-cache.c
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credential-store.c Merge branch 'cb/credential-store-ignore-bogus-lines' 2020-05-08 14:25:01 -07:00
credential.c Merge branch 'js/partial-urlmatch' 2020-05-05 14:54:30 -07:00
credential.h credential: correct order of parameters for credential_match 2020-05-04 22:56:33 -07:00
csum-file.c hash: implement and use a context cloning function 2020-02-24 09:33:21 -08:00
csum-file.h
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ctype.c
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daemon.c
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date.c date.c: allow compact version of ISO-8601 datetime 2020-04-24 14:06:09 -07:00
decorate.c
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decorate.h
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delta-islands.c oid_array: rename source file from sha1-array 2020-03-30 10:59:08 -07:00
delta-islands.h
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delta.h
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detect-compiler
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diff-delta.c
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diff-lib.c diff-files --raw: show correct post-image of intent-to-add files 2020-07-01 16:15:43 -07:00
diff-no-index.c
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diff.c Merge branch 'jk/diff-memuse-optim-with-stat-unmatch' 2020-06-17 21:54:00 -07:00
diff.h diff: halt tree-diff early after max_changes 2020-03-30 09:59:53 -07:00
diffcore-break.c diff: restrict when prefetching occurs 2020-04-07 16:09:29 -07:00
diffcore-delta.c
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diffcore-order.c
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diffcore-pickaxe.c
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diffcore-rename.c diff: restrict when prefetching occurs 2020-04-07 16:09:29 -07:00
diffcore.h diff: restrict when prefetching occurs 2020-04-07 16:09:29 -07:00
dir-iterator.c
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dir-iterator.h
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dir.c Merge branch 'en/clean-cleanups' 2020-06-25 12:27:45 -07:00
dir.h
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editor.c real_path: remove unsafe API 2020-03-10 11:41:40 -07:00
entry.c Merge branch 'mt/entry-fstat-fallback-fix' into master 2020-07-09 14:00:45 -07:00
environment.c Merge branch 'tb/shallow-cleanup' 2020-05-13 12:19:18 -07:00
exec-cmd.c
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exec-cmd.h
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fast-import.c Merge branch 'en/fast-import-looser-date' 2020-06-02 13:35:05 -07:00
fetch-negotiator.c
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fetch-negotiator.h
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fetch-pack.c Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
fetch-pack.h fetch-pack: support more than one pack lockfile 2020-06-10 18:06:34 -07:00
fmt-merge-msg.c fmt-merge-msg: stop treating `master` specially 2020-06-23 17:22:35 -07:00
fmt-merge-msg.h Lib-ify fmt-merge-msg 2020-03-24 15:04:43 -07:00
fsck.c Merge branch 'rs/fsck-duplicate-names-in-trees' 2020-06-08 18:06:29 -07:00
fsck.h
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fsmonitor.c
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fsmonitor.h
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fuzz-commit-graph.c fuzz-commit-graph: properly free graph struct 2020-06-08 10:02:29 -07:00
fuzz-pack-headers.c
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fuzz-pack-idx.c
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generate-cmdlist.sh help: move list_config_help to builtin/help 2020-04-16 15:22:16 -07:00
generate-configlist.sh help: move list_config_help to builtin/help 2020-04-16 15:22:16 -07:00
gettext.c
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gettext.h
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git-add--interactive.perl checkout -p: handle new files correctly 2020-05-27 14:50:20 -07:00
git-archimport.perl
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git-bisect.sh bisect: avoid tailing CR characters from revision in replay 2020-05-20 10:13:19 -07:00
git-compat-util.h Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
git-cvsexportcommit.perl git-cvsexportcommit: port to SHA-256 2020-06-22 11:21:07 -07:00
git-cvsimport.perl git-cvsimport: port to SHA-256 2020-06-22 11:21:07 -07:00
git-cvsserver.perl git-cvsserver: port to SHA-256 2020-06-22 11:21:07 -07:00
git-difftool--helper.sh
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git-filter-branch.sh
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git-instaweb.sh
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git-merge-octopus.sh
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git-merge-one-file.sh
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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 Merge branch 'bk/p4-prepare-p4-only-fix' 2020-06-02 13:35:01 -07:00
git-parse-remote.sh
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git-quiltimport.sh
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git-rebase--preserve-merges.sh
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git-request-pull.sh
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git-send-email.perl send-email: restore --in-reply-to superseding behavior 2020-07-01 16:12:21 -07:00
git-sh-i18n.sh
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git-sh-setup.sh
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git-submodule.sh submodule: port subcommand 'set-branch' from shell to C 2020-06-02 10:51:54 -07:00
git-svn.perl git-svn: set the OID length based on hash algorithm 2020-06-22 11:21:07 -07:00
git-web--browse.sh
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git.c Merge branch 'ta/wait-on-aliased-commands-upon-signal' into master 2020-07-15 16:29:43 -07:00
git.rc
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gpg-interface.c gpg-interface: prefer check_signature() for GPG verification 2020-03-15 09:46:28 -07:00
gpg-interface.h gpg-interface: prefer check_signature() for GPG verification 2020-03-15 09:46:28 -07:00
graph.c graph.c: limit linkage of internal variable 2020-04-27 11:21:25 -07:00
graph.h
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grep.c
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grep.h
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hash.h hash: implement and use a context cloning function 2020-02-24 09:33:21 -08:00
hashmap.c
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hashmap.h
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help.c help: add shell-path to --build-options 2020-05-12 22:02:17 -07:00
help.h bugreport: gather git version and build info 2020-04-16 15:23:42 -07:00
hex.c hex: add functions to parse hex object IDs in any algorithm 2020-02-24 09:33:21 -08:00
http-backend.c
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http-fetch.c http-fetch: support fetching packfiles by URL 2020-06-10 18:06:34 -07:00
http-push.c Merge branch 'bc/http-push-flagsfix' 2020-07-06 22:09:17 -07:00
http-walker.c http: refactor finish_http_pack_request() 2020-06-10 18:06:34 -07:00
http.c Merge branch 'jt/cdn-offload' 2020-06-25 12:27:47 -07:00
http.h Merge branch 'jt/cdn-offload' 2020-06-25 12:27:47 -07:00
ident.c
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imap-send.c http, imap-send: stop using CURLOPT_VERBOSE 2020-05-11 11:18:01 -07:00
interdiff.c
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interdiff.h
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iterator.h
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json-writer.c
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json-writer.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 'ds/line-log-on-bloom' 2020-06-08 18:06:26 -07:00
line-log.h line-log: more responsive, incremental 'git log -L' 2020-05-11 09:33:56 -07:00
line-range.c
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line-range.h
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linear-assignment.c
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linear-assignment.h
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list-objects-filter-options.c repository: add a helper function to perform repository format upgrade 2020-06-05 10:13:30 -07:00
list-objects-filter-options.h Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
list-objects-filter.c list-objects-filter: treat NULL filter_options as "disabled" 2020-05-04 21:57:58 -07:00
list-objects-filter.h
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list-objects.c
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list-objects.h
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list.h
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ll-merge.c parse_config_key(): return subsection len as size_t 2020-04-10 14:44:29 -07:00
ll-merge.h
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lockfile.c lockfile.c: introduce 'hold_lock_file_for_update_mode' 2020-04-27 11:27:36 -07:00
lockfile.h lockfile.c: introduce 'hold_lock_file_for_update_mode' 2020-04-27 11:27:36 -07:00
log-tree.c Merge branch 'ds/log-exclude-decoration-config' 2020-04-28 15:50:08 -07:00
log-tree.h log: add log.excludeDecoration config option 2020-04-16 11:05:48 -07:00
ls-refs.c upload-pack: handle unexpected delim packets 2020-03-27 12:18:48 -07:00
ls-refs.h
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mailinfo.c mailinfo: disallow NUL character in mail's header 2020-04-22 14:01:03 -07:00
mailinfo.h
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mailmap.c
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mailmap.h
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match-trees.c
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mem-pool.c
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mem-pool.h
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merge-blobs.c
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merge-blobs.h
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merge-recursive.c merge-recursive: fix rename/rename(1to2) for working tree with a binary 2020-05-14 12:14:19 -07:00
merge-recursive.h
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merge.c builtin/checkout: compute checkout metadata for checkouts 2020-03-16 11:37:02 -07:00
mergesort.c
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mergesort.h
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midx.c multi-pack-index: respect repack.packKeptObjects=false 2020-05-10 09:50:55 -07:00
midx.h Merge branch 'ds/multi-pack-index' 2020-05-01 13:39:55 -07:00
name-hash.c
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notes-cache.c
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notes-cache.h
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notes-merge.c
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notes-merge.h
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notes-utils.c
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notes-utils.h
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notes.c Merge branch 'jh/notes-fanout-fix' into maint 2020-03-17 15:02:22 -07:00
notes.h
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object-store.h packfile: compute and use the index CRC offset 2020-05-27 10:07:07 -07:00
object.c object: drop parsed_object_pool->commit_count 2020-06-17 14:37:14 -07:00
object.h Merge branch 'tb/fix-persistent-shallow' into master 2020-07-09 14:00:44 -07:00
oid-array.c oid_array: rename source file from sha1-array 2020-03-30 10:59:08 -07:00
oid-array.h oid_array: rename source file from sha1-array 2020-03-30 10:59:08 -07:00
oidmap.c
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oidmap.h
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oidset.c oidset: introduce 'oidset_size' 2020-04-15 09:20:29 -07:00
oidset.h Merge branch 'tb/commit-graph-split-strategy' 2020-05-01 13:39:52 -07:00
pack-bitmap-write.c
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pack-bitmap.c pack-bitmap: pass object filter to fill-in traversal 2020-05-04 21:57:58 -07:00
pack-bitmap.h Merge branch 'jk/object-filter-with-bitmap' 2020-03-02 15:07:18 -08:00
pack-check.c pack-check: push oid lookup into loop 2020-02-24 12:55:53 -08:00
pack-objects.c pack-objects: convert oe_set_delta_ext() to use object_id 2020-02-24 12:55:52 -08:00
pack-objects.h pack-objects: convert oe_set_delta_ext() to use object_id 2020-02-24 12:55:52 -08:00
pack-revindex.c
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pack-revindex.h
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pack-write.c
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pack.h
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packfile.c packfile: compute and use the index CRC offset 2020-05-27 10:07:07 -07:00
packfile.h packfile: drop nth_packed_object_sha1() 2020-02-24 12:55:53 -08:00
pager.c
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parse-options-cb.c oid_array: rename source file from sha1-array 2020-03-30 10:59:08 -07:00
parse-options.c parse-options: teach "git cmd -h" to show alias as alias 2020-03-16 14:27:07 -07:00
parse-options.h merge: teach --autostash option 2020-04-10 09:28:02 -07:00
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 'dl/merge-autostash' 2020-04-29 16:15:27 -07:00
path.h merge: teach --autostash option 2020-04-10 09:28:02 -07:00
pathspec.c prefix_path: show gitdir if worktree unavailable 2020-03-15 09:35:46 -07:00
pathspec.h
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pkt-line.c Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
pkt-line.h Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
preload-index.c
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pretty.c format-patch: teach --no-encode-email-headers 2020-04-07 22:37:18 -07:00
pretty.h format-patch: teach --no-encode-email-headers 2020-04-07 22:37:18 -07:00
prio-queue.c
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prio-queue.h
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progress.c progress: call trace2_region_leave() only after calling _enter() 2020-05-15 09:41:30 -07:00
progress.h progress.c: silence cgcc suggestion about internal linkage 2020-04-27 11:21:28 -07:00
promisor-remote.c Merge branch 'jt/avoid-prefetch-when-able-in-diff' 2020-04-28 15:50:04 -07:00
promisor-remote.h promisor-remote: accept 0 as oid_nr in function 2020-04-02 12:42:32 -07:00
prompt.c interactive: explicitly `fflush` stdout before expecting input 2020-04-10 10:27:16 -07:00
prompt.h interactive: refactor code asking the user for interactive input 2020-04-10 10:26:31 -07:00
protocol.c config: let feature.experimental imply protocol.version=2 2020-05-21 09:31:42 -07:00
protocol.h
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prune-packed.c Lib-ify prune-packed 2020-03-24 15:04:44 -07:00
prune-packed.h Lib-ify prune-packed 2020-03-24 15:04:44 -07:00
quote.c quote: use isalnum() to check for alphanumeric characters 2020-02-24 09:30:29 -08:00
quote.h
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range-diff.c range-diff: avoid negative string precision 2020-04-15 18:32:48 -07:00
range-diff.h
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reachable.c
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reachable.h
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read-cache.c
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rebase-interactive.c Merge branch 'rt/format-zero-length-fix' 2020-03-09 11:21:21 -07:00
rebase-interactive.h Merge branch 'en/rebase-backend' 2020-03-02 15:07:19 -08:00
rebase.c
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rebase.h
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ref-filter.c Merge branch 'es/get-worktrees-unsort' 2020-07-06 22:09:15 -07:00
ref-filter.h Merge branch 'jk/for-each-ref-multi-key-sort-fix' 2020-05-08 14:25:04 -07:00
reflog-walk.c
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reflog-walk.h
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refs.c Merge branch 'js/default-branch-name' 2020-07-06 22:09:17 -07:00
refs.h Merge branch 'js/default-branch-name' 2020-07-06 22:09:17 -07:00
refspec.c
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refspec.h
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remote-curl.c Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
remote-testsvn.c testsvn: respect `init.defaultBranch` 2020-06-24 09:14:21 -07:00
remote.c remote: use the configured default branch name when appropriate 2020-06-24 09:14:21 -07:00
remote.h stateless-connect: send response end packet 2020-05-24 16:26:00 -07:00
replace-object.c
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replace-object.h
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repo-settings.c experimental: default to fetch.writeCommitGraph=false 2020-07-08 16:37:43 -07:00
repository.c repository: require a build flag to use SHA-256 2020-02-24 09:33:21 -08:00
repository.h repository: add a helper function to perform repository format upgrade 2020-06-05 10:13:30 -07:00
rerere.c
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rerere.h
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reset.c Merge branch 'dl/merge-autostash' 2020-04-29 16:15:27 -07:00
reset.h reset: extract reset_head() from rebase 2020-04-10 09:28:02 -07:00
resolve-undo.c
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resolve-undo.h
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revision.c Merge branch 'rs/line-log-until' into master 2020-07-09 14:00:42 -07:00
revision.h revision: reallocate TOPO_WALK object flags 2020-06-24 09:09:44 -07:00
run-command.c Merge branch 'ta/wait-on-aliased-commands-upon-signal' into master 2020-07-15 16:29:43 -07:00
run-command.h Merge branch 'ta/wait-on-aliased-commands-upon-signal' into master 2020-07-15 16:29:43 -07:00
send-pack.c Merge branch 'js/default-branch-name' 2020-07-06 22:09:17 -07:00
send-pack.h
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sequencer.c Merge branch 'js/rebase-autosquash-double-fixup-fix' 2020-05-14 14:39:43 -07:00
sequencer.h Merge branch 'dl/merge-autostash' 2020-04-29 16:15:27 -07:00
serve.c Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
serve.h
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server-info.c
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setup.c Merge branch 'jn/v0-with-extensions-fix' into master 2020-07-16 17:58:42 -07:00
sh-i18n--envsubst.c
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sha1-file.c Merge branch 'lr/freshen-file-fix' 2020-04-28 15:49:56 -07:00
sha1-lookup.c
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sha1-lookup.h
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sha1-name.c Merge branch 'jc/missing-ref-store-fix' 2020-04-22 13:42:55 -07:00
sha1dc_git.c
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sha1dc_git.h
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shallow.c Merge branch 'tb/shallow-cleanup' 2020-05-13 12:19:18 -07:00
shallow.h shallow: use struct 'shallow_lock' for additional safety 2020-04-30 14:19:13 -07:00
shell.c interactive: refactor code asking the user for interactive input 2020-04-10 10:26:31 -07:00
shortlog.h
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sideband.c
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sideband.h
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sigchain.c
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sigchain.h
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split-index.c
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split-index.h
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stable-qsort.c
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strbuf.c Merge branch 'rs/retire-strbuf-write-fd' 2020-06-29 14:17:26 -07:00
strbuf.h Merge branch 'rs/retire-strbuf-write-fd' 2020-06-29 14:17:26 -07:00
streaming.c
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streaming.h
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string-list.c
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string-list.h
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sub-process.c
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sub-process.h
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submodule-config.c parse_config_key(): return subsection len as size_t 2020-04-10 14:44:29 -07:00
submodule-config.h
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submodule.c Merge branch 'jk/oid-array-cleanups' 2020-04-22 13:42:49 -07:00
submodule.h get_superproject_working_tree(): return strbuf 2020-03-10 11:41:40 -07:00
symlinks.c
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tag.c object: drop parsed_object_pool->commit_count 2020-06-17 14:37:14 -07:00
tag.h
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tar.h
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tempfile.c tempfile.c: introduce 'create_tempfile_mode' 2020-04-27 11:27:35 -07:00
tempfile.h tempfile.c: introduce 'create_tempfile_mode' 2020-04-27 11:27:35 -07:00
thread-utils.c
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thread-utils.h
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tmp-objdir.c
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tmp-objdir.h
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trace.c http, imap-send: stop using CURLOPT_VERBOSE 2020-05-11 11:18:01 -07:00
trace.h http, imap-send: stop using CURLOPT_VERBOSE 2020-05-11 11:18:01 -07:00
trace2.c trace2: teach Git to log environment variables 2020-03-23 13:14:53 -07:00
trace2.h trace2: teach Git to log environment variables 2020-03-23 13:14:53 -07:00
trailer.c
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trailer.h
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transport-helper.c Merge branch 'js/default-branch-name' 2020-07-06 22:09:17 -07:00
transport-internal.h
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transport.c Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
transport.h Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
tree-diff.c diff: halt tree-diff early after max_changes 2020-03-30 09:59:53 -07:00
tree-walk.c
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tree-walk.h
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tree.c object: drop parsed_object_pool->commit_count 2020-06-17 14:37:14 -07:00
tree.h
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unicode-width.h unicode: update the width tables to Unicode 13.0 2020-03-17 15:06:37 -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 'en/sparse-checkout' 2020-05-20 08:33:29 -07:00
unpack-trees.h Merge branch 'en/sparse-checkout' 2020-04-29 16:15:30 -07:00
upload-pack.c Merge branch 'bc/sha-256-part-2' 2020-07-06 22:09:13 -07:00
upload-pack.h
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url.c
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url.h
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urlmatch.c credential: handle `credential.<partial-URL>.<key>` again 2020-04-24 15:53:46 -07:00
urlmatch.h credential: handle `credential.<partial-URL>.<key>` again 2020-04-24 15:53:46 -07:00
usage.c
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userdiff.c Merge branch 'ah/userdiff-markdown' 2020-05-08 14:25:01 -07:00
userdiff.h
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utf8.c
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utf8.h
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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 'rs/show-progress-in-dumb-http-fetch' 2020-03-09 11:21:21 -07:00
walker.h remote-curl: show progress for fetches over dumb HTTP 2020-03-03 13:15:40 -08:00
wildmatch.c
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wildmatch.h
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worktree.c Merge branch 'es/worktree-code-cleanup' 2020-07-06 22:09:19 -07:00
worktree.h worktree: drop get_worktrees() unused 'flags' argument 2020-06-22 10:31:15 -07:00
wrap-for-bin.sh
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wrapper.c xrealloc: do not reuse pointer freed by zero-length realloc() 2020-09-02 12:18:14 -07:00
write-or-die.c
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ws.c
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wt-status.c wt-status: show sparse checkout status as well 2020-06-18 14:12:28 -07:00
wt-status.h wt-status: show sparse checkout status as well 2020-06-18 14:12:28 -07:00
xdiff-interface.c
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xdiff-interface.h
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zlib.c
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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). 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://lore.kernel.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