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Junio C Hamano 1b8ac5ead5 git_open(): untangle possible NOATIME and CLOEXEC interactions
The way we structured the fallback/retry mechanism for opening with
O_NOATIME and O_CLOEXEC meant that if we failed due to lack of
support to open the file with O_NOATIME option (i.e. EINVAL), we
would still try to drop O_CLOEXEC first and retry, and then drop
O_NOATIME.  A platform on which O_NOATIME is defined in the header
without support from the kernel wouldn't have a chance to open with
O_CLOEXEC option due to this code structure.

Arguably, O_CLOEXEC is more important than O_NOATIME, as the latter
is mostly about performance, while the former can affect correctness.

Instead use O_CLOEXEC to open the file, and then use fcntl(2) to set
O_NOATIME on the resulting file descriptor.  open(2) itself does not
cause atime to be updated according to Linus [*1*].

The helper to do the former can be usable in the codepath in
ce_compare_data() that was recently added to open a file descriptor
with O_CLOEXEC; use it while we are at it.

*1* <CA+55aFw83E+zOd+z5h-CA-3NhrLjVr-anL6pubrSWttYx3zu8g@mail.gmail.com>

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-10-28 06:23:07 -07:00
Documentation Merge branch 'jk/alt-odb-cleanup' 2016-10-17 13:25:20 -07:00
block-sha1
builtin sha1_file: rename git_open_noatime() to git_open() 2016-10-25 10:59:13 -07:00
ci
compat Merge branch 'rs/compat-strdup' into maint 2016-09-19 13:51:42 -07:00
contrib Merge branch 'rs/copy-array' into maint 2016-10-11 14:18:32 -07:00
ewah
git-gui Merge branch 'rs/git-gui-use-modern-git-merge-syntax' into maint 2016-10-11 14:20:37 -07:00
gitk-git
gitweb gitweb: use highlight's shebang detection 2016-09-25 16:39:11 -07:00
mergetools
perl
po git-gui: l10n: add Portuguese translation 2016-09-26 07:18:33 -07:00
ppc
refs use QSORT 2016-09-29 15:42:18 -07:00
t Merge branch 'jk/alt-odb-cleanup' 2016-10-17 13:25:20 -07:00
templates
vcs-svn Merge branch 'mr/vcs-svn-printf-ulong' into maint 2016-09-29 16:49:37 -07:00
xdiff Merge branch 'mh/diff-indent-heuristic' 2016-10-03 13:30:38 -07:00
.gitattributes
.gitignore
.mailmap add David Turner's Two Sigma address 2016-09-26 17:46:44 -07:00
.travis.yml Merge branch 'ls/travis-homebrew-path-fix' into maint 2016-09-29 16:49:45 -07:00
COPYING
GIT-VERSION-GEN Git 2.10.1 2016-10-03 13:24:18 -07:00
INSTALL
LGPL-2.1
Makefile coccicheck: use --all-includes by default 2016-09-29 20:40:18 -07:00
README.md
RelNotes Start preparing for 2.10.2 2016-10-11 14:24:02 -07:00
abspath.c
aclocal.m4
advice.c
advice.h
alias.c
alloc.c
apply.c introduce CHECKOUT_INIT 2016-09-22 13:42:18 -07:00
apply.h apply: learn to use a different index file 2016-09-07 12:29:54 -07:00
archive-tar.c Merge branch 'jk/big-and-future-archive-tar' 2016-08-12 09:47:37 -07:00
archive-zip.c
archive.c i18n: archive: mark errors for translation 2016-08-09 12:44:59 -07:00
archive.h
argv-array.c
argv-array.h
attr.c
attr.h
base85.c
bisect.c use QSORT 2016-09-29 15:42:18 -07:00
bisect.h
blob.c
blob.h
branch.c
branch.h
builtin.h builtin: convert textconv_object to use struct object_id 2016-09-07 12:59:42 -07:00
bulk-checkin.c
bulk-checkin.h
bundle.c
bundle.h
cache-tree.c cache: convert struct cache_entry to use struct object_id 2016-09-07 12:59:42 -07:00
cache-tree.h
cache.h git_open(): untangle possible NOATIME and CLOEXEC interactions 2016-10-28 06:23:07 -07:00
check-builtins.sh
check-racy.c
check_bindir
color.c Merge branch 'jk/squelch-false-warning-from-gcc-o3' into maint 2016-09-19 13:51:41 -07:00
color.h Merge branch 'js/color-on-windows-comment' into maint 2016-07-28 11:25:55 -07:00
column.c
column.h
combine-diff.c
command-list.txt
commit-slab.h Merge branch 'vs/typofix' 2016-08-12 09:47:37 -07:00
commit.c Merge branch 'rs/copy-array' into maint 2016-10-11 14:18:32 -07:00
commit.h Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
common-main.c
config.c get_short_sha1: make default disambiguation configurable 2016-09-27 10:29:56 -07:00
config.mak.in
config.mak.uname Merge branch 'ew/build-time-pager-tweaks' 2016-08-08 14:48:44 -07:00
configure.ac Merge branch 'dp/autoconf-curl-ssl' 2016-10-10 14:03:48 -07:00
connect.c Merge branch 'va/i18n-more' 2016-09-26 16:09:18 -07:00
connect.h
connected.c
connected.h
convert.c convert: Correct NNO tests and missing `LF will be replaced by CRLF` 2016-08-14 13:45:52 -07:00
convert.h
copy.c
credential-cache--daemon.c
credential-cache.c
credential-store.c
credential.c
credential.h
csum-file.c
csum-file.h
ctype.c
daemon.c Merge branch 'jk/common-main' into maint 2016-09-08 21:35:51 -07:00
date.c date: add "unix" format 2016-07-27 14:15:51 -07:00
decorate.c
decorate.h
delta.h
diff-delta.c
diff-lib.c cache: convert struct cache_entry to use struct object_id 2016-09-07 12:59:42 -07:00
diff-no-index.c Merge branch 'jk/setup-sequence-update' 2016-09-21 15:15:24 -07:00
diff.c Merge branch 'rs/qsort' 2016-10-10 14:03:46 -07:00
diff.h Merge branch 'mh/diff-indent-heuristic' 2016-09-26 16:09:16 -07:00
diffcore-break.c
diffcore-delta.c use QSORT 2016-09-29 15:42:18 -07:00
diffcore-order.c use QSORT 2016-09-29 15:42:18 -07:00
diffcore-pickaxe.c Merge branch 'js/regexec-buf' into maint 2016-09-29 16:49:45 -07:00
diffcore-rename.c use QSORT 2016-09-29 15:42:18 -07:00
diffcore.h
dir-iterator.c
dir-iterator.h
dir.c use QSORT 2016-09-29 15:42:18 -07:00
dir.h Merge branch 'mh/split-under-lock' 2016-07-25 14:13:32 -07:00
editor.c
entry.c streaming: make stream_blob_to_fd take struct object_id 2016-09-07 12:59:42 -07:00
environment.c Merge branch 'jk/setup-sequence-update' 2016-09-21 15:15:24 -07:00
exec_cmd.c
exec_cmd.h
fast-import.c use QSORT 2016-09-29 15:42:18 -07:00
fetch-pack.c Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
fetch-pack.h
fmt-merge-msg.h
fsck.c fsck: handle bad trees like other errors 2016-09-27 14:09:10 -07:00
fsck.h
generate-cmdlist.sh
gettext.c
gettext.h
git-add--interactive.perl diff: improve positioning of add/delete blocks in diffs 2016-09-19 10:25:11 -07:00
git-archimport.perl
git-bisect.sh
git-compat-util.h Merge branch 'rs/copy-array' into maint 2016-10-11 14:18:32 -07:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl
git-difftool--helper.sh difftool: always honor fatal error exit codes 2016-08-15 15:24:05 -07:00
git-difftool.perl difftool: use Git::* functions instead of passing around state 2016-07-28 14:01:55 -07:00
git-filter-branch.sh
git-instaweb.sh
git-merge-octopus.sh git-merge-octopus: do not capitalize "octopus" 2016-09-08 12:17:10 -07:00
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh
git-mergetool.sh
git-p4.py Spelling fixes 2016-08-11 14:35:42 -07:00
git-parse-remote.sh
git-quiltimport.sh
git-rebase--am.sh
git-rebase--interactive.sh Merge branch 'rt/rebase-i-broken-insn-advise' into maint 2016-09-29 16:49:46 -07:00
git-rebase--merge.sh
git-rebase.sh
git-relink.perl
git-remote-testgit.sh
git-request-pull.sh
git-send-email.perl
git-sh-i18n.sh
git-sh-setup.sh Merge branch 'ew/build-time-pager-tweaks' 2016-08-08 14:48:44 -07:00
git-stash.sh i18n: stash: mark messages for translation 2016-09-21 10:20:43 -07:00
git-submodule.sh clone: pass --progress decision to recursive submodules 2016-09-22 11:22:47 -07:00
git-svn.perl git-svn: allow --version to work anywhere 2016-07-22 20:38:11 +00:00
git-web--browse.sh
git.c Merge branch 'jk/setup-sequence-update' 2016-09-21 15:15:24 -07:00
git.rc
gpg-interface.c Merge branch 'lt/gpg-show-long-key-in-signature-verification-maint' into lt/gpg-show-long-key-in-signature-verification 2016-08-16 15:04:13 -07:00
gpg-interface.h
graph.c Merge branch 'jk/graph-padding-fix' into maint 2016-10-11 14:19:03 -07:00
graph.h graph: add support for --line-prefix on all graph-aware output 2016-08-31 18:07:09 -07:00
grep.c Merge branch 'js/regexec-buf' into maint 2016-09-29 16:49:45 -07:00
grep.h Merge branch 'jc/grep-commandline-vs-configuration' into maint 2016-08-10 11:55:29 -07:00
hashmap.c
hashmap.h
help.c use QSORT 2016-09-29 15:42:18 -07:00
help.h
hex.c Merge branch 'rs/hex2chr' into maint 2016-09-19 13:51:43 -07:00
http-backend.c Merge branch 'ew/http-backend-batch-headers' 2016-08-12 09:47:38 -07:00
http-fetch.c
http-push.c Merge branch 'jk/common-main' into maint 2016-09-08 21:35:51 -07:00
http-walker.c
http.c Merge branch 'dt/http-empty-auth' 2016-10-17 13:25:18 -07:00
http.h
ident.c Merge branch 'jk/ident-ai-canonname-could-be-null' into maint 2016-10-03 13:22:32 -07:00
imap-send.c Merge branch 'ak/curl-imap-send-explicit-scheme' 2016-10-10 14:03:48 -07:00
iterator.h
khash.h
kwset.c
kwset.h
levenshtein.c
levenshtein.h
line-log.c use QSORT 2016-09-29 15:42:18 -07:00
line-log.h
line-range.c
line-range.h
list-objects.c
list-objects.h
list.h
ll-merge.c
ll-merge.h
lockfile.c
lockfile.h mingw: ensure temporary file handles are not inherited by child processes 2016-08-23 09:09:55 -07:00
log-tree.c graph: add support for --line-prefix on all graph-aware output 2016-08-31 18:07:09 -07:00
log-tree.h
mailinfo.c Merge branch 'kd/mailinfo-quoted-string' 2016-10-03 13:30:38 -07:00
mailinfo.h mailinfo: handle in-body header continuations 2016-09-21 10:23:11 -07:00
mailmap.c
mailmap.h
match-trees.c
merge-blobs.c
merge-blobs.h
merge-recursive.c Merge branch 'rs/cocci' 2016-09-26 16:09:14 -07:00
merge-recursive.h merge-recursive: offer an option to retain the output in 'obuf' 2016-08-01 11:45:30 -07:00
merge.c sequencer: lib'ify checkout_fast_forward() 2016-09-09 11:24:52 -07:00
mergesort.c
mergesort.h
mru.c add generic most-recently-used list 2016-07-29 11:05:07 -07:00
mru.h add generic most-recently-used list 2016-07-29 11:05:07 -07:00
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c Merge branch 'va/i18n-more' 2016-09-26 16:09:18 -07:00
notes-merge.h
notes-utils.c
notes-utils.h
notes.c notes: convert init_notes to use struct object_id 2016-09-07 12:59:42 -07:00
notes.h
object.c
object.h
pack-bitmap-write.c use QSORT 2016-09-29 15:42:18 -07:00
pack-bitmap.c sha1_file: rename git_open_noatime() to git_open() 2016-10-25 10:59:13 -07:00
pack-bitmap.h
pack-check.c Merge branch 'jk/verify-packfile-gently' into maint 2016-10-11 14:21:36 -07:00
pack-objects.c
pack-objects.h pack-objects: break delta cycles before delta-search phase 2016-08-11 10:44:13 -07:00
pack-revindex.c use COPY_ARRAY 2016-09-25 16:44:13 -07:00
pack-revindex.h
pack-write.c use QSORT 2016-09-29 15:42:18 -07:00
pack.h
pager.c Merge branch 'jk/setup-sequence-update' 2016-09-21 15:15:24 -07:00
parse-options-cb.c Merge branch 'mh/diff-indent-heuristic' 2016-09-26 16:09:16 -07:00
parse-options.c
parse-options.h Merge branch 'mh/diff-indent-heuristic' 2016-09-26 16:09:16 -07:00
patch-delta.c
patch-ids.c patch-ids: refuse to compute patch-id for merge commit 2016-09-12 13:45:01 -07:00
patch-ids.h rebase: avoid computing unnecessary patch IDs 2016-08-11 14:39:16 -07:00
path.c Merge branch 'jk/diff-submodule-diff-inline' 2016-09-12 15:34:31 -07:00
pathspec.c Merge branch 'rs/qsort' 2016-10-10 14:03:46 -07:00
pathspec.h Merge branch 'bw/pathspec-remove-unused-extern-decl' into maint 2016-09-29 16:49:34 -07:00
pkt-line.c introduce hex2chr() for converting two hexadecimal digits to a character 2016-09-07 10:42:46 -07:00
pkt-line.h
preload-index.c
pretty.c Merge branch 'rs/c-auto-resets-attributes' 2016-10-06 14:53:12 -07:00
prio-queue.c
prio-queue.h
progress.c
progress.h
prompt.c
prompt.h
quote.c Merge branch 'nd/icase' into maint 2016-07-28 11:26:03 -07:00
quote.h Merge branch 'nd/icase' into maint 2016-07-28 11:26:03 -07:00
reachable.c
reachable.h
read-cache.c git_open(): untangle possible NOATIME and CLOEXEC interactions 2016-10-28 06:23:07 -07:00
ref-filter.c Merge branch 'rs/qsort' 2016-10-10 14:03:46 -07:00
ref-filter.h
reflog-walk.c
reflog-walk.h
refs.c Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
refs.h Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
remote-curl.c Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
remote-testsvn.c
remote.c use strbuf_addstr() for adding constant strings to a strbuf, part 2 2016-09-15 12:23:38 -07:00
remote.h Merge branch 'jk/push-force-with-lease-creation' into maint 2016-09-08 21:35:53 -07:00
replace_object.c
rerere.c cache: convert struct cache_entry to use struct object_id 2016-09-07 12:59:42 -07:00
rerere.h
resolve-undo.c cache: convert struct cache_entry to use struct object_id 2016-09-07 12:59:42 -07:00
resolve-undo.h
revision.c Merge branch 'vn/revision-shorthand-for-side-branch-log' 2016-10-06 14:53:10 -07:00
revision.h
run-command.c Merge branch 'ab/hooks' 2016-08-19 15:34:16 -07:00
run-command.h
send-pack.c Merge branch 'rs/use-strbuf-addstr' into maint 2016-08-10 11:55:34 -07:00
send-pack.h
sequencer.c sequencer: ensure to release the lock when we could not read the index 2016-09-09 11:24:52 -07:00
sequencer.h
server-info.c use QSORT 2016-09-29 15:42:18 -07:00
setup.c i18n: setup: mark error messages for translation 2016-08-09 12:44:59 -07:00
sh-i18n--envsubst.c remove unnecessary check before QSORT 2016-09-29 15:42:18 -07:00
sha1-array.c Merge branch 'rs/qsort' 2016-10-10 14:03:46 -07:00
sha1-array.h sha1_array: let callbacks interrupt iteration 2016-09-26 11:46:41 -07:00
sha1-lookup.c
sha1-lookup.h
sha1_file.c git_open(): untangle possible NOATIME and CLOEXEC interactions 2016-10-28 06:23:07 -07:00
sha1_name.c Merge branch 'jk/alt-odb-cleanup' 2016-10-17 13:25:20 -07:00
shallow.c Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
shell.c
shortlog.h
show-index.c
sideband.c Merge branch 'lf/recv-sideband-cleanup' into maint 2016-08-08 14:21:41 -07:00
sideband.h
sigchain.c
sigchain.h
split-index.c use COPY_ARRAY 2016-09-25 16:44:13 -07:00
split-index.h
strbuf.c link_alt_odb_entry: handle normalize_path errors 2016-10-10 13:52:36 -07:00
strbuf.h link_alt_odb_entry: handle normalize_path errors 2016-10-10 13:52:36 -07:00
streaming.c Merge branch 'jk/pack-objects-optim-mru' 2016-10-10 14:03:47 -07:00
streaming.h streaming: make stream_blob_to_fd take struct object_id 2016-09-07 12:59:42 -07:00
string-list.c use QSORT 2016-09-29 15:42:18 -07:00
string-list.h
submodule-config.c Merge branch 'sb/submodule-update-dot-branch' 2016-08-10 12:33:20 -07:00
submodule-config.h submodule-config: keep configured branch around 2016-08-01 14:42:07 -07:00
submodule.c Merge branch 'jk/alt-odb-cleanup' 2016-10-17 13:25:20 -07:00
submodule.h diff: teach diff to display submodule difference with an inline diff 2016-08-31 18:07:10 -07:00
symlinks.c
tag.c
tag.h
tar.h
tempfile.c mingw: ensure temporary file handles are not inherited by child processes 2016-08-23 09:09:55 -07:00
tempfile.h mingw: ensure temporary file handles are not inherited by child processes 2016-08-23 09:09:55 -07:00
thread-utils.c
thread-utils.h
trace.c trace: do not fall back to stderr 2016-08-05 09:28:17 -07:00
trace.h
trailer.c die("bug"): report bugs consistently 2016-07-26 11:13:44 -07:00
trailer.h
transport-helper.c Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
transport.c Merge branch 'jk/alt-odb-cleanup' 2016-10-17 13:25:20 -07:00
transport.h Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
tree-diff.c
tree-walk.c fsck: handle bad trees like other errors 2016-09-27 14:09:10 -07:00
tree-walk.h fsck: handle bad trees like other errors 2016-09-27 14:09:10 -07:00
tree.c use QSORT 2016-09-29 15:42:18 -07:00
tree.h
unicode_width.h
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c Merge branch 'rs/unpack-trees-reduce-file-scope-global' into maint 2016-09-29 16:49:36 -07:00
unpack-trees.h
update_unicode.sh
upload-pack.c Merge branch 'nd/shallow-deepen' 2016-10-10 14:03:50 -07:00
url.c introduce hex2chr() for converting two hexadecimal digits to a character 2016-09-07 10:42:46 -07:00
url.h
urlmatch.c
urlmatch.h
usage.c Merge branch 'cc/apply-am' 2016-09-19 13:47:18 -07:00
userdiff.c
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 Merge branch 'nd/worktree-lock' 2016-07-28 10:34:42 -07:00
worktree.h
wrap-for-bin.sh
wrapper.c Merge branch 'sb/submodule-parallel-fetch' into maint 2016-07-28 11:26:02 -07:00
write_or_die.c write_or_die: drop write_or_whine_pipe() 2016-08-05 09:28:17 -07:00
ws.c
wt-status.c Merge branch 'rs/cocci' 2016-10-06 14:53:12 -07:00
wt-status.h status: print branch info with --porcelain=v2 --branch 2016-08-11 11:15:40 -07:00
xdiff-interface.c Merge branch 'js/regexec-buf' into maint 2016-09-29 16:49:45 -07:00
xdiff-interface.h Convert read_mmblob to take struct object_id. 2016-09-07 12:59:42 -07:00
zlib.c

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 http://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-.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 http://news.gmane.org/gmane.comp.version-control.git/, http://marc.info/?l=git and other archival sites.

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