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Brad King 98aee92d5c refs: add update_refs for multiple simultaneous updates
Add 'struct ref_update' to encode the information needed to update or
delete a ref (name, new sha1, optional old sha1, no-deref flag).  Add
function 'update_refs' accepting an array of updates to perform.  First
sort the input array to order locks consistently everywhere and reject
multiple updates to the same ref.  Then acquire locks on all refs with
verified old values.  Then update or delete all refs accordingly.  Fail
if any one lock cannot be obtained or any one old value does not match.

Though the refs themselves cannot be modified together in a single
atomic transaction, this function does enable some useful semantics.
For example, a caller may create a new branch starting from the head of
another branch and rewind the original branch at the same time.  This
transfers ownership of commits between branches without risk of losing
commits added to the original branch by a concurrent process, or risk of
a concurrent process creating the new branch first.

Signed-off-by: Brad King <brad.king@kitware.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-09-04 11:10:28 -07:00
block-sha1
builtin refs: report ref type from lock_any_ref_for_update 2013-08-30 14:57:28 -07:00
compat Merge branch 'rj/cygwin-clarify-use-of-cheating-lstat' 2013-08-02 11:01:01 -07:00
contrib git-remote-mediawiki: ignore generated git-mw 2013-08-13 09:52:22 -07:00
Documentation Git 1.8.4 2013-08-23 11:49:46 -07:00
git-gui
git_remote_helpers
gitk-git
gitweb
mergetools
perl
po l10n: Add reference for french translation team 2013-08-11 17:14:58 +02:00
ppc
t Revert "Add new @ shortcut for HEAD" 2013-08-14 15:04:24 -07:00
templates templates: spell ASCII in uppercase in pre-commit hook 2013-07-15 09:52:57 -07:00
vcs-svn
xdiff
.gitattributes
.gitignore Merge branch 'es/check-mailmap' 2013-07-22 11:24:14 -07:00
.mailmap Merge branch 'sb/mailmap-updates' 2013-08-13 10:49:33 -07:00
abspath.c
aclocal.m4
advice.c Rename advice.object_name_warning to objectNameWarning 2013-07-31 15:20:07 -07:00
advice.h Merge branch 'jk/gcc-function-attributes' 2013-07-22 11:23:59 -07:00
alias.c
alloc.c
archive-tar.c
archive-zip.c Merge branch 'sb/archive-zip-double-assignment-fix' into maint 2013-07-19 10:40:53 -07:00
archive.c
archive.h
argv-array.c
argv-array.h Add the LAST_ARG_MUST_BE_NULL macro 2013-07-19 09:26:15 -07:00
attr.c
attr.h
base85.c
bisect.c
bisect.h
blob.c
blob.h
branch.c refs: report ref type from lock_any_ref_for_update 2013-08-30 14:57:28 -07:00
branch.h
builtin.h builtin: add git-check-mailmap command 2013-07-13 10:19:37 -07:00
bulk-checkin.c
bulk-checkin.h
bundle.c
bundle.h
cache-tree.c
cache-tree.h
cache.h Merge branch 'ob/typofixes' 2013-08-01 12:01:01 -07:00
check-builtins.sh
check-racy.c
check_bindir
color.c
color.h
column.c
column.h
combine-diff.c many small typofixes 2013-07-29 12:32:25 -07:00
command-list.txt builtin: add git-check-mailmap command 2013-07-13 10:19:37 -07:00
commit-slab.h commit-slab.h: Fix memory allocation and addressing 2013-07-29 08:44:29 -07:00
commit.c Merge branch 'bc/commit-invalid-utf8' 2013-08-05 10:11:04 -07:00
commit.h commit.h: drop redundant comment 2013-07-25 16:06:23 -07:00
config.c Merge branch 'hv/config-from-blob' 2013-07-22 11:24:09 -07:00
config.mak.in
config.mak.uname Merge branch 'rj/cygwin-clarify-use-of-cheating-lstat' 2013-08-02 11:01:01 -07:00
configure.ac
connect.c
connected.c
connected.h
convert.c typofix: in-code comments 2013-07-22 16:06:49 -07:00
convert.h typofix: in-code comments 2013-07-22 16:06:49 -07:00
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 Merge branch 'sb/misc-fixes' 2013-07-24 19:20:59 -07:00
date.c
decorate.c
decorate.h
delta.h
diff-delta.c
diff-lib.c
diff-no-index.c
diff.c Merge branch 'ob/typofixes' 2013-07-24 19:23:01 -07:00
diff.h
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c Merge branch 'rs/pickaxe-simplify' 2013-07-12 12:04:17 -07:00
diffcore-rename.c
diffcore.h
dir.c Merge branch 'nd/const-struct-cache-entry' 2013-07-22 11:24:01 -07:00
dir.h
editor.c
entry.c Merge branch 'nd/const-struct-cache-entry' 2013-07-22 11:24:01 -07:00
environment.c Merge branch 'jk/cat-file-batch-optim' 2013-07-24 19:21:21 -07:00
exec_cmd.c
exec_cmd.h Add the LAST_ARG_MUST_BE_NULL macro 2013-07-19 09:26:15 -07:00
fast-import.c refs: report ref type from lock_any_ref_for_update 2013-08-30 14:57:28 -07:00
fetch-pack.c
fetch-pack.h
fmt-merge-msg.h
fsck.c
fsck.h
generate-cmdlist.sh
gettext.c
gettext.h
git-add--interactive.perl
git-am.sh
git-archimport.perl
git-bisect.sh
git-compat-util.h Merge branch 'rj/cygwin-clarify-use-of-cheating-lstat' 2013-08-02 11:01:01 -07:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl
git-difftool--helper.sh
git-difftool.perl
git-filter-branch.sh
git-instaweb.sh
git-lost-found.sh
git-merge-octopus.sh
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh many small typofixes 2013-07-29 12:32:25 -07:00
git-mergetool.sh
git-p4.py many small typofixes 2013-07-29 12:32:25 -07:00
git-parse-remote.sh
git-pull.sh Merge branch 'jk/pull-into-dirty-unborn' into maint 2013-07-15 10:35:43 -07:00
git-quiltimport.sh
git-rebase--am.sh
git-rebase--interactive.sh Merge branch 'rr/rebase-reflog-message-reword' 2013-07-18 12:48:20 -07:00
git-rebase--merge.sh
git-rebase.sh Merge branch 'rr/rebase-autostash' 2013-07-31 12:38:29 -07:00
git-relink.perl
git-remote-testgit.sh
git-remote-testpy.py
git-repack.sh
git-request-pull.sh request-pull: improve error message for invalid revision args 2013-07-17 12:30:58 -07:00
git-send-email.perl Merge branch 'rr/send-email-ssl-verify' 2013-07-22 11:24:17 -07:00
git-sh-i18n.sh
git-sh-setup.sh
git-stash.sh Revert "git stash: avoid data loss when "git stash save" kills a directory" 2013-08-14 09:53:43 -07:00
git-submodule.sh Merge branch 'fg/submodule-clone-depth' 2013-07-15 10:28:48 -07:00
git-svn.perl Merge branch 'vl/typofix' into maint 2013-07-19 10:42:57 -07:00
GIT-VERSION-GEN Git 1.8.4 2013-08-23 11:49:46 -07:00
git-web--browse.sh
git.c Merge branch 'es/check-mailmap' 2013-07-22 11:24:14 -07:00
git.rc
git.spec.in
gpg-interface.c
gpg-interface.h
graph.c
graph.h
grep.c
grep.h
hash.c
hash.h
help.c cygwin: Remove the Win32 l/stat() implementation 2013-07-18 10:44:17 -07:00
help.h
hex.c
http-backend.c
http-fetch.c
http-push.c http-push.c::add_send_request(): do not initialize transfer_request 2013-07-19 11:15:17 -07:00
http-walker.c
http.c Merge branch 'bc/http-keep-memory-given-to-curl' into maint 2013-07-15 10:36:01 -07:00
http.h
ident.c
imap-send.c
INSTALL
kwset.c typofix: in-code comments 2013-07-22 16:06:49 -07:00
kwset.h
levenshtein.c
levenshtein.h
LGPL-2.1
line-log.c line-log: fix "log -LN" crash when N is last line of file 2013-07-23 12:09:48 -07:00
line-log.h
line-range.c line-range: fix "blame -L X,-N" regression 2013-07-17 18:02:12 -07:00
line-range.h
list-objects.c
list-objects.h
ll-merge.c
ll-merge.h
lockfile.c
log-tree.c Merge branch 'jk/format-patch-from' 2013-07-15 10:28:40 -07:00
log-tree.h
mailmap.c mailmap: style fixes 2013-07-15 08:23:39 -07:00
mailmap.h
Makefile Merge branch 'rj/cygwin-clarify-use-of-cheating-lstat' 2013-08-02 11:01:01 -07:00
match-trees.c
merge-blobs.c
merge-blobs.h
merge-recursive.c
merge-recursive.h
merge.c
mergesort.c
mergesort.h
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c
notes-merge.h
notes-utils.c
notes-utils.h
notes.c
notes.h many small typofixes 2013-07-29 12:32:25 -07:00
object.c Merge branch 'sb/parse-object-buffer-eaten' 2013-07-22 11:23:33 -07:00
object.h
pack-check.c
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
pager.c
parse-options-cb.c
parse-options.c
parse-options.h Merge branch 'maint' 2013-08-09 15:49:55 -07:00
patch-delta.c
patch-ids.c
patch-ids.h
path.c Merge branch 'rj/cygwin-clarify-use-of-cheating-lstat' 2013-08-02 11:01:01 -07:00
pathspec.c
pathspec.h
pkt-line.c
pkt-line.h
preload-index.c
pretty.c
prio-queue.c
prio-queue.h
progress.c
progress.h
prompt.c
prompt.h
quote.c
quote.h
reachable.c
reachable.h
read-cache.c many small typofixes 2013-07-29 12:32:25 -07:00
README
reflog-walk.c
reflog-walk.h
refs.c refs: add update_refs for multiple simultaneous updates 2013-09-04 11:10:28 -07:00
refs.h refs: add update_refs for multiple simultaneous updates 2013-09-04 11:10:28 -07:00
RelNotes Start preparing for 1.8.3.4 2013-07-19 11:15:17 -07:00
remote-curl.c
remote-testsvn.c
remote.c Merge branch 'bc/push-match-many-refs' 2013-07-18 12:48:25 -07:00
remote.h
replace_object.c
rerere.c
rerere.h
resolve-undo.c
resolve-undo.h
revision.c
revision.h
run-command.c Merge branch 'tr/fd-gotcha-fixes' 2013-07-22 11:23:13 -07:00
run-command.h Add the LAST_ARG_MUST_BE_NULL macro 2013-07-19 09:26:15 -07:00
send-pack.c
send-pack.h
sequencer.c refs: report ref type from lock_any_ref_for_update 2013-08-30 14:57:28 -07:00
sequencer.h
server-info.c
setup.c Merge branch 'jx/clean-interactive' 2013-07-22 11:24:11 -07:00
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-lookup.c
sha1-lookup.h
sha1_file.c Merge branch 'jk/cat-file-batch-optim' 2013-07-24 19:21:21 -07:00
sha1_name.c Revert "Add new @ shortcut for HEAD" 2013-08-14 15:04:24 -07:00
shallow.c Merge branch 'mk/upload-pack-off-by-one-dead-code-removal' 2013-07-22 11:24:05 -07:00
shell.c Merge branch 'tr/protect-low-3-fds' 2013-07-22 11:23:35 -07:00
shortlog.h
show-index.c
sideband.c
sideband.h
sigchain.c
sigchain.h
strbuf.c
strbuf.h
streaming.c Merge branch 'jk/cat-file-batch-optim' 2013-07-24 19:21:21 -07:00
streaming.h
string-list.c
string-list.h
submodule.c Merge branch 'nd/const-struct-cache-entry' 2013-07-22 11:24:01 -07:00
submodule.h
symlinks.c
tag.c
tag.h
tar.h
test-chmtime.c
test-ctype.c
test-date.c
test-delta.c
test-dump-cache-tree.c
test-genrandom.c
test-index-version.c
test-line-buffer.c
test-match-trees.c
test-mergesort.c
test-mktemp.c
test-parse-options.c
test-path-utils.c
test-prio-queue.c
test-read-cache.c
test-regex.c
test-revision-walking.c
test-run-command.c
test-scrap-cache-tree.c
test-sha1.c
test-sha1.sh
test-sigchain.c
test-string-list.c
test-subprocess.c
test-svn-fe.c
test-wildmatch.c
thread-utils.c
thread-utils.h
trace.c
transport-helper.c many small typofixes 2013-07-29 12:32:25 -07:00
transport.c Merge branch 'ph/builtin-srcs-are-in-subdir-these-days' into maint 2013-07-21 22:51:29 -07:00
transport.h Merge branch 'ph/builtin-srcs-are-in-subdir-these-days' into maint 2013-07-21 22:51:29 -07:00
tree-diff.c
tree-walk.c traverse_trees(): clarify return value of the callback 2013-07-19 15:29:41 -07:00
tree-walk.h
tree.c
tree.h
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c
unpack-trees.h
upload-pack.c
url.c
url.h
usage.c
userdiff.c
userdiff.h
utf8.c
utf8.h
varint.c
varint.h
version.c
version.h
walker.c
walker.h
wildmatch.c
wildmatch.h
wrap-for-bin.sh
wrapper.c Merge branch 'tr/fd-gotcha-fixes' 2013-07-22 11:23:13 -07:00
write_or_die.c
ws.c
wt-status.c Merge branch 'jx/clean-interactive' 2013-07-22 11:24:11 -07:00
wt-status.h
xdiff-interface.c
xdiff-interface.h
zlib.c

////////////////////////////////////////////////////////////////

	Git - the stupid content tracker

////////////////////////////////////////////////////////////////

"git" can mean anything, 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

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.

See Documentation/gittutorial.txt to get started, then see
Documentation/everyday.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).

Many Git online resources are accessible from http://git-scm.com/
including full documentation and Git related tools.

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.