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Taylor Blau b78a556a6a commit-graph.c: gracefully handle file descriptor exhaustion 
When writing a layered commit-graph, the commit-graph machinery uses
'commit_graph_filenames_after' and 'commit_graph_hash_after' to keep
track of the layers in the chain that we are in the process of writing.

When the number of commit-graph layers shrinks, we initialize all
entries in the aforementioned arrays, because we know the structure of
the new commit-graph chain immediately (since there are no new layers,
there are no unknown hash values).

But when the number of commit-graph layers grows (i.e., that
'num_commit_graphs_after > num_commit_graphs_before'), then we leave
some entries in the filenames and hashes arrays as uninitialized,
because we will fill them in later as those values become available.

For instance, we rely on 'write_commit_graph_file's to store the
filename and hash of the last layer in the new chain, which is the one
that it is responsible for writing. But, it's possible that
'write_commit_graph_file' may fail, e.g., from file descriptor
exhaustion. In this case it is possible that 'git_mkstemp_mode' will
fail, and that function will return early *before* setting the values
for the last commit-graph layer's filename and hash.

This causes a number of upleasant side-effects. For instance, trying to
'free()' each entry in 'ctx->commit_graph_filenames_after' (and
similarly for the hashes array) causes us to 'free()' uninitialized
memory, since the area is allocated with 'malloc()' and is therefore
subject to contain garbage (which is left alone when
'write_commit_graph_file' returns early).

This can manifest in other issues, like a general protection fault,
and/or leaving a stray 'commit-graph-chain.lock' around after the
process dies. (The reasoning for this is still a mystery to me, since
we'd otherwise usually expect the kernel to run tempfile.c's 'atexit()'
handlers in the case of a normal death...)

To resolve this, initialize the memory with 'CALLOC_ARRAY' so that
uninitialized entries are filled with zeros, and can thus be 'free()'d
as a noop instead of causing a fault.

Helped-by: Jeff King <peff@peff.net>
Helped-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-23 14:58:52 -07:00
.github
block-sha1
builtin commit-graph.c: introduce '--[no-]check-oids' 2020-04-15 09:20:34 -07:00
ci Merge branch 'sg/osx-force-gcc-9' 2019-12-06 15:09:21 -08:00
compat Merge branch 'js/mingw-reserved-filenames' 2020-01-02 12:38:30 -08:00
contrib Merge branch 'dl/pretty-reference' 2019-12-10 13:11:43 -08:00
Documentation commit-graph.c: introduce '--[no-]check-oids' 2020-04-15 09:20:34 -07:00
ewah
git-gui Merge https://github.com/prati0100/git-gui 2020-01-08 11:18:06 -08:00
gitk-git
gitweb Merge branch 'do/gitweb-typofix-in-comments' 2020-01-08 12:44:11 -08:00
mergetools
negotiator
perl
po l10n: zh_CN: for git v2.25.0 l10n round 1 2020-01-12 19:22:02 +08:00
ppc
refs refs: pass NULL to refs_read_ref_full() because object ID is not needed 2019-12-11 13:48:42 -08:00
sha1collisiondetection@855827c583
sha1dc Merge branch 'jk/lore-is-the-archive' 2019-12-06 15:09:23 -08:00
sha256
t commit-graph.c: gracefully handle file descriptor exhaustion 2020-04-23 14:58:52 -07:00
templates
trace2
vcs-svn
xdiff Merge branch 'rs/xdiff-ignore-ws-w-func-context' 2019-12-16 13:08:32 -08:00
.cirrus.yml CI: add FreeBSD CI support via Cirrus-CI 2019-12-20 12:09:12 -08:00
.clang-format
.editorconfig
.gitattributes
.gitignore
.gitmodules
.mailmap mailmap: mask accentless variant for Công Danh 2019-12-26 09:53:09 -08:00
.travis.yml
.tsan-suppressions
abspath.c
aclocal.m4
add-interactive.c built-in add -p: implement hunk editing 2019-12-13 12:37:14 -08:00
add-interactive.h built-in add -p: implement hunk editing 2019-12-13 12:37:14 -08:00
add-patch.c built-in add -p: show helpful hint when nothing can be staged 2019-12-13 12:37:14 -08:00
advice.c
advice.h
alias.c
alias.h
alloc.c
alloc.h
apply.c Merge branch 'js/add-i-a-bit-more-tests' 2019-12-16 13:08:47 -08:00
apply.h
archive-tar.c
archive-zip.c Merge branch 'rs/archive-zip-code-cleanup' 2019-12-16 13:14:47 -08:00
archive.c
archive.h
argv-array.c
argv-array.h
attr.c
attr.h
azure-pipelines.yml
banned.h
base85.c
bisect.c
bisect.h
blame.c
blame.h
blob.c
blob.h
branch.c
branch.h
builtin.h
bulk-checkin.c
bulk-checkin.h
bundle.c
bundle.h
cache-tree.c
cache-tree.h
cache.h Merge branch 'ds/sparse-cone' 2020-01-06 14:17:51 -08:00
chdir-notify.c
chdir-notify.h
check-builtins.sh
check_bindir
checkout.c
checkout.h
CODE_OF_CONDUCT.md
color.c
color.h
column.c
column.h
combine-diff.c
command-list.txt Merge branch 'ds/sparse-cone' 2019-12-25 11:21:58 -08:00
commit-graph.c commit-graph.c: gracefully handle file descriptor exhaustion 2020-04-23 14:58:52 -07:00
commit-graph.h commit-graph.h: replace 'commit_hex' with 'commits' 2020-04-15 09:20:30 -07:00
commit-reach.c
commit-reach.h
commit-slab-decl.h
commit-slab-impl.h
commit-slab.h
commit.c
commit.h
common-main.c
config.c
config.h
config.mak.dev
config.mak.in
config.mak.uname Sync with 2.23.1 2019-12-06 16:31:39 +01:00
configure.ac
connect.c Sync with 2.23.1 2019-12-06 16:31:39 +01:00
connect.h
connected.c
connected.h
convert.c
convert.h
copy.c
COPYING
credential-cache--daemon.c
credential-cache.c
credential-store.c
credential.c
credential.h
csum-file.c
csum-file.h
ctype.c
daemon.c
date.c
decorate.c
decorate.h
delta-islands.c
delta-islands.h
delta.h
detect-compiler
diff-delta.c
diff-lib.c
diff-no-index.c
diff.c
diff.h Merge branch 'hw/doc-in-header' 2019-12-16 13:08:39 -08:00
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c
diffcore-rename.c
diffcore.h
dir-iterator.c
dir-iterator.h
dir.c Merge branch 'en/fill-directory-fixes' 2019-12-25 11:22:02 -08:00
dir.h Merge branch 'ds/sparse-cone' 2019-12-25 11:21:58 -08:00
editor.c
entry.c
environment.c Merge branch 'ds/sparse-cone' 2019-12-25 11:21:58 -08:00
exec-cmd.c
exec-cmd.h
fast-import.c Sync with 2.23.1 2019-12-06 16:31:39 +01:00
fetch-negotiator.c
fetch-negotiator.h
fetch-pack.c
fetch-pack.h
fmt-merge-msg.h
fsck.c Sync with Git 2.24.1 2019-12-09 22:17:55 -08:00
fsck.h
fsmonitor.c
fsmonitor.h
fuzz-commit-graph.c
fuzz-pack-headers.c
fuzz-pack-idx.c
generate-cmdlist.sh
gettext.c
gettext.h
git-add--interactive.perl git add -p: use non-zero exit code when the diff generation failed 2019-12-06 08:57:34 -08:00
git-archimport.perl
git-bisect.sh
git-compat-util.h Sync with Git 2.24.1 2019-12-09 22:17:55 -08:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl
git-difftool--helper.sh
git-filter-branch.sh
git-instaweb.sh
git-legacy-stash.sh
git-merge-octopus.sh
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh
git-mergetool.sh
git-p4.py Merge branch 'bk/p4-misc-usability' 2020-01-02 12:38:29 -08:00
git-parse-remote.sh
git-quiltimport.sh
git-rebase--preserve-merges.sh
git-request-pull.sh
git-send-email.perl
git-sh-i18n.sh
git-sh-setup.sh
git-submodule.sh Merge branch 'dl/submodule-set-url' 2019-12-10 13:11:42 -08:00
git-svn.perl git svn: stop using rebase --preserve-merges 2019-11-23 09:49:23 +09:00
GIT-VERSION-GEN Git 2.25 2020-01-13 10:16:43 -08:00
git-web--browse.sh
git.c
git.rc
gpg-interface.c
gpg-interface.h
graph.c graph: fix lack of color in horizontal lines 2020-01-08 09:37:18 -08:00
graph.h
grep.c
grep.h
hash.h
hashmap.c
hashmap.h
help.c
help.h
hex.c
http-backend.c
http-fetch.c
http-push.c
http-walker.c
http.c
http.h
ident.c
imap-send.c
INSTALL Merge branch 'ar/install-doc-update-cmds-needing-the-shell' 2019-12-01 09:04:41 -08:00
interdiff.c
interdiff.h
iterator.h
json-writer.c
json-writer.h
khash.h
kwset.c
kwset.h
levenshtein.c
levenshtein.h
LGPL-2.1
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.c
list-objects-filter.h
list-objects.c
list-objects.h
list.h
ll-merge.c
ll-merge.h
lockfile.c
lockfile.h
log-tree.c Merge branch 'hi/gpg-use-check-signature' 2019-12-10 13:11:45 -08:00
log-tree.h
ls-refs.c
ls-refs.h
mailinfo.c
mailinfo.h
mailmap.c
mailmap.h
Makefile Merge branch 'js/add-p-in-c' 2019-12-25 11:22:01 -08:00
match-trees.c
mem-pool.c
mem-pool.h
merge-blobs.c
merge-blobs.h
merge-recursive.c Merge branch 'en/merge-recursive-oid-eq-simplify' 2020-01-06 14:17:51 -08:00
merge-recursive.h
merge.c
mergesort.c
mergesort.h
midx.c
midx.h
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c
notes-merge.h
notes-utils.c
notes-utils.h
notes.c Merge branch 'dl/format-patch-notes-config-fixup' 2019-12-25 11:21:58 -08:00
notes.h Merge branch 'dl/format-patch-notes-config-fixup' 2019-12-25 11:21:58 -08:00
object-store.h
object.c
object.h
oidmap.c
oidmap.h
oidset.c oidset: introduce 'oidset_size' 2020-04-15 09:20:29 -07:00
oidset.h oidset: introduce 'oidset_size' 2020-04-15 09:20:29 -07:00
pack-bitmap-write.c
pack-bitmap.c
pack-bitmap.h
pack-check.c
pack-objects.c
pack-objects.h
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
packfile.c Merge branch 'ew/packfile-syscall-optim' 2020-01-06 14:17:50 -08:00
packfile.h
pager.c
parse-options-cb.c
parse-options.c
parse-options.h Merge branch 'hw/doc-in-header' 2019-12-16 13:08:39 -08:00
patch-delta.c
patch-ids.c
patch-ids.h
path.c Sync with Git 2.24.1 2019-12-09 22:17:55 -08:00
path.h
pathspec.c
pathspec.h Merge branch 'hw/doc-in-header' 2019-12-16 13:08:39 -08:00
pkt-line.c
pkt-line.h
preload-index.c
pretty.c Merge branch 'dl/pretty-reference' 2019-12-10 13:11:43 -08:00
pretty.h
prio-queue.c
prio-queue.h
progress.c
progress.h
promisor-remote.c
promisor-remote.h
prompt.c
prompt.h
protocol.c
protocol.h
quote.c
quote.h
range-diff.c range-diff: mark pointers as const 2019-12-06 12:34:49 -08:00
range-diff.h Merge branch 'dl/range-diff-with-notes' 2019-12-16 13:08:46 -08:00
reachable.c
reachable.h
read-cache.c Merge branch 'js/mingw-loosen-overstrict-tree-entry-checks' 2020-01-10 14:45:27 -08:00
README.md
rebase-interactive.c
rebase-interactive.h
ref-filter.c
ref-filter.h
reflog-walk.c
reflog-walk.h
refs.c
refs.h
refspec.c
refspec.h
RelNotes Git 2.24.1 2019-12-06 16:31:40 +01:00
remote-curl.c
remote-testsvn.c
remote.c
remote.h
replace-object.c
replace-object.h
repo-settings.c
repository.c
repository.h
rerere.c
rerere.h
resolve-undo.c
resolve-undo.h
revision.c Merge branch 'dl/format-patch-notes-config-fixup' 2019-12-25 11:21:58 -08:00
revision.h Merge branch 'dl/format-patch-notes-config-fixup' 2019-12-25 11:21:58 -08:00
run-command.c
run-command.h
send-pack.c Merge branch 'jk/send-pack-check-negative-with-quick' 2019-12-06 15:09:22 -08:00
send-pack.h
sequencer.c Revert "Merge branch 'ra/rebase-i-more-options'" 2020-01-12 13:25:18 -08:00
sequencer.h Revert "Merge branch 'ra/rebase-i-more-options'" 2020-01-12 13:25:18 -08:00
serve.c
serve.h
server-info.c
setup.c
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-file.c
sha1-lookup.c
sha1-lookup.h
sha1-name.c
sha1dc_git.c
sha1dc_git.h
shallow.c
shell.c
shortlog.h
sideband.c
sideband.h
sigchain.c
sigchain.h
split-index.c
split-index.h
stable-qsort.c
strbuf.c strbuf: add a helper function to call the editor "on an strbuf" 2019-12-13 12:37:14 -08:00
strbuf.h strbuf: add a helper function to call the editor "on an strbuf" 2019-12-13 12:37:14 -08:00
streaming.c
streaming.h
string-list.c
string-list.h
sub-process.c
sub-process.h
submodule-config.c fix-typo: consecutive-word duplications 2019-12-16 11:53:11 -08:00
submodule-config.h
submodule.c Sync with 2.22.2 2019-12-06 16:31:30 +01:00
submodule.h Sync with 2.22.2 2019-12-06 16:31:30 +01:00
symlinks.c
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.h
transport-helper.c Sync with 2.23.1 2019-12-06 16:31:39 +01:00
transport-internal.h
transport.c
transport.h
tree-diff.c
tree-walk.c Merge branch 'js/mingw-loosen-overstrict-tree-entry-checks' 2020-01-06 14:17:50 -08:00
tree-walk.h
tree.c
tree.h
unicode-width.h
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c Merge branch 'ds/sparse-cone' 2019-12-25 11:21:58 -08:00
unpack-trees.h
upload-pack.c
upload-pack.h
url.c
url.h
urlmatch.c
urlmatch.h
usage.c
userdiff.c Merge branch 'ln/userdiff-elixir' 2019-12-25 11:21:59 -08:00
userdiff.h
utf8.c
utf8.h
varint.c
varint.h
version.c
version.h
versioncmp.c
walker.c
walker.h
wildmatch.c
wildmatch.h
worktree.c
worktree.h
wrap-for-bin.sh
wrapper.c
write-or-die.c
ws.c
wt-status.c
wt-status.h
xdiff-interface.c
xdiff-interface.h
zlib.c

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