merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

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diff --git a/third_party/git/Documentation/giteveryday.txt b/third_party/git/Documentation/giteveryday.txt
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+giteveryday(7)
+==============
+
+NAME
+----
+giteveryday - A useful minimum set of commands for Everyday Git
+
+SYNOPSIS
+--------
+
+Everyday Git With 20 Commands Or So
+
+DESCRIPTION
+-----------
+
+Git users can broadly be grouped into four categories for the purposes of
+describing here a small set of useful command for everyday Git.
+
+*	<<STANDALONE,Individual Developer (Standalone)>> commands are essential
+	for anybody who makes a commit, even for somebody who works alone.
+
+*	If you work with other people, you will need commands listed in
+	the <<PARTICIPANT,Individual Developer (Participant)>> section as well.
+
+*	People who play the <<INTEGRATOR,Integrator>> role need to learn some
+	more commands in addition to the above.
+
+*	<<ADMINISTRATION,Repository Administration>> commands are for system
+	administrators who are responsible for the care and feeding
+	of Git repositories.
+
+
+Individual Developer (Standalone)[[STANDALONE]]
+-----------------------------------------------
+
+A standalone individual developer does not exchange patches with
+other people, and works alone in a single repository, using the
+following commands.
+
+  * linkgit:git-init[1] to create a new repository.
+
+  * linkgit:git-log[1] to see what happened.
+
+  * linkgit:git-switch[1] and linkgit:git-branch[1] to switch
+    branches.
+
+  * linkgit:git-add[1] to manage the index file.
+
+  * linkgit:git-diff[1] and linkgit:git-status[1] to see what
+    you are in the middle of doing.
+
+  * linkgit:git-commit[1] to advance the current branch.
+
+  * linkgit:git-restore[1] to undo changes.
+
+  * linkgit:git-merge[1] to merge between local branches.
+
+  * linkgit:git-rebase[1] to maintain topic branches.
+
+  * linkgit:git-tag[1] to mark a known point.
+
+Examples
+~~~~~~~~
+
+Use a tarball as a starting point for a new repository.::
++
+------------
+$ tar zxf frotz.tar.gz
+$ cd frotz
+$ git init
+$ git add . <1>
+$ git commit -m "import of frotz source tree."
+$ git tag v2.43 <2>
+------------
++
+<1> add everything under the current directory.
+<2> make a lightweight, unannotated tag.
+
+Create a topic branch and develop.::
++
+------------
+$ git switch -c alsa-audio <1>
+$ edit/compile/test
+$ git restore curses/ux_audio_oss.c <2>
+$ git add curses/ux_audio_alsa.c <3>
+$ edit/compile/test
+$ git diff HEAD <4>
+$ git commit -a -s <5>
+$ edit/compile/test
+$ git diff HEAD^ <6>
+$ git commit -a --amend <7>
+$ git switch master <8>
+$ git merge alsa-audio <9>
+$ git log --since='3 days ago' <10>
+$ git log v2.43.. curses/ <11>
+------------
++
+<1> create a new topic branch.
+<2> revert your botched changes in `curses/ux_audio_oss.c`.
+<3> you need to tell Git if you added a new file; removal and
+modification will be caught if you do `git commit -a` later.
+<4> to see what changes you are committing.
+<5> commit everything, as you have tested, with your sign-off.
+<6> look at all your changes including the previous commit.
+<7> amend the previous commit, adding all your new changes,
+using your original message.
+<8> switch to the master branch.
+<9> merge a topic branch into your master branch.
+<10> review commit logs; other forms to limit output can be
+combined and include `-10` (to show up to 10 commits),
+`--until=2005-12-10`, etc.
+<11> view only the changes that touch what's in `curses/`
+directory, since `v2.43` tag.
+
+
+Individual Developer (Participant)[[PARTICIPANT]]
+-------------------------------------------------
+
+A developer working as a participant in a group project needs to
+learn how to communicate with others, and uses these commands in
+addition to the ones needed by a standalone developer.
+
+  * linkgit:git-clone[1] from the upstream to prime your local
+    repository.
+
+  * linkgit:git-pull[1] and linkgit:git-fetch[1] from "origin"
+    to keep up-to-date with the upstream.
+
+  * linkgit:git-push[1] to shared repository, if you adopt CVS
+    style shared repository workflow.
+
+  * linkgit:git-format-patch[1] to prepare e-mail submission, if
+    you adopt Linux kernel-style public forum workflow.
+
+  * linkgit:git-send-email[1] to send your e-mail submission without
+    corruption by your MUA.
+
+  * linkgit:git-request-pull[1] to create a summary of changes
+    for your upstream to pull.
+
+
+Examples
+~~~~~~~~
+
+Clone the upstream and work on it.  Feed changes to upstream.::
++
+------------
+$ git clone git://git.kernel.org/pub/scm/.../torvalds/linux-2.6 my2.6
+$ cd my2.6
+$ git switch -c mine master <1>
+$ edit/compile/test; git commit -a -s <2>
+$ git format-patch master <3>
+$ git send-email --to="person <email@example.com>" 00*.patch <4>
+$ git switch master <5>
+$ git pull <6>
+$ git log -p ORIG_HEAD.. arch/i386 include/asm-i386 <7>
+$ git ls-remote --heads http://git.kernel.org/.../jgarzik/libata-dev.git <8>
+$ git pull git://git.kernel.org/pub/.../jgarzik/libata-dev.git ALL <9>
+$ git reset --hard ORIG_HEAD <10>
+$ git gc <11>
+------------
++
+<1> checkout a new branch `mine` from master.
+<2> repeat as needed.
+<3> extract patches from your branch, relative to master,
+<4> and email them.
+<5> return to `master`, ready to see what's new
+<6> `git pull` fetches from `origin` by default and merges into the
+current branch.
+<7> immediately after pulling, look at the changes done upstream
+since last time we checked, only in the
+area we are interested in.
+<8> check the branch names in an external repository (if not known).
+<9> fetch from a specific branch `ALL` from a specific repository
+and merge it.
+<10> revert the pull.
+<11> garbage collect leftover objects from reverted pull.
+
+
+Push into another repository.::
++
+------------
+satellite$ git clone mothership:frotz frotz <1>
+satellite$ cd frotz
+satellite$ git config --get-regexp '^(remote|branch)\.' <2>
+remote.origin.url mothership:frotz
+remote.origin.fetch refs/heads/*:refs/remotes/origin/*
+branch.master.remote origin
+branch.master.merge refs/heads/master
+satellite$ git config remote.origin.push \
+	   +refs/heads/*:refs/remotes/satellite/* <3>
+satellite$ edit/compile/test/commit
+satellite$ git push origin <4>
+
+mothership$ cd frotz
+mothership$ git switch master
+mothership$ git merge satellite/master <5>
+------------
++
+<1> mothership machine has a frotz repository under your home
+directory; clone from it to start a repository on the satellite
+machine.
+<2> clone sets these configuration variables by default.
+It arranges `git pull` to fetch and store the branches of mothership
+machine to local `remotes/origin/*` remote-tracking branches.
+<3> arrange `git push` to push all local branches to
+their corresponding branch of the mothership machine.
+<4> push will stash all our work away on `remotes/satellite/*`
+remote-tracking branches on the mothership machine.  You could use this
+as a back-up method. Likewise, you can pretend that mothership
+"fetched" from you (useful when access is one sided).
+<5> on mothership machine, merge the work done on the satellite
+machine into the master branch.
+
+Branch off of a specific tag.::
++
+------------
+$ git switch -c private2.6.14 v2.6.14 <1>
+$ edit/compile/test; git commit -a
+$ git checkout master
+$ git cherry-pick v2.6.14..private2.6.14 <2>
+------------
++
+<1> create a private branch based on a well known (but somewhat behind)
+tag.
+<2> forward port all changes in `private2.6.14` branch to `master` branch
+without a formal "merging". Or longhand +
+`git format-patch -k -m --stdout v2.6.14..private2.6.14 |
+  git am -3 -k`
+
+An alternate participant submission mechanism is using the
+`git request-pull` or pull-request mechanisms (e.g as used on
+GitHub (www.github.com) to notify your upstream of your
+contribution.
+
+Integrator[[INTEGRATOR]]
+------------------------
+
+A fairly central person acting as the integrator in a group
+project receives changes made by others, reviews and integrates
+them and publishes the result for others to use, using these
+commands in addition to the ones needed by participants.
+
+This section can also be used by those who respond to `git
+request-pull` or pull-request on GitHub (www.github.com) to
+integrate the work of others into their history. A sub-area
+lieutenant for a repository will act both as a participant and
+as an integrator.
+
+
+  * linkgit:git-am[1] to apply patches e-mailed in from your
+    contributors.
+
+  * linkgit:git-pull[1] to merge from your trusted lieutenants.
+
+  * linkgit:git-format-patch[1] to prepare and send suggested
+    alternative to contributors.
+
+  * linkgit:git-revert[1] to undo botched commits.
+
+  * linkgit:git-push[1] to publish the bleeding edge.
+
+
+Examples
+~~~~~~~~
+
+A typical integrator's Git day.::
++
+------------
+$ git status <1>
+$ git branch --no-merged master <2>
+$ mailx <3>
+& s 2 3 4 5 ./+to-apply
+& s 7 8 ./+hold-linus
+& q
+$ git switch -c topic/one master
+$ git am -3 -i -s ./+to-apply <4>
+$ compile/test
+$ git switch -c hold/linus && git am -3 -i -s ./+hold-linus <5>
+$ git switch topic/one && git rebase master <6>
+$ git switch -C pu next <7>
+$ git merge topic/one topic/two && git merge hold/linus <8>
+$ git switch maint
+$ git cherry-pick master~4 <9>
+$ compile/test
+$ git tag -s -m "GIT 0.99.9x" v0.99.9x <10>
+$ git fetch ko && for branch in master maint next pu <11>
+    do
+	git show-branch ko/$branch $branch <12>
+    done
+$ git push --follow-tags ko <13>
+------------
++
+<1> see what you were in the middle of doing, if anything.
+<2> see which branches haven't been merged into `master` yet.
+Likewise for any other integration branches e.g. `maint`, `next`
+and `pu` (potential updates).
+<3> read mails, save ones that are applicable, and save others
+that are not quite ready (other mail readers are available).
+<4> apply them, interactively, with your sign-offs.
+<5> create topic branch as needed and apply, again with sign-offs.
+<6> rebase internal topic branch that has not been merged to the
+master or exposed as a part of a stable branch.
+<7> restart `pu` every time from the next.
+<8> and bundle topic branches still cooking.
+<9> backport a critical fix.
+<10> create a signed tag.
+<11> make sure master was not accidentally rewound beyond that
+already pushed out.
+<12> In the output from `git show-branch`, `master` should have
+everything `ko/master` has, and `next` should have
+everything `ko/next` has, etc.
+<13> push out the bleeding edge, together with new tags that point
+into the pushed history.
+
+In this example, the `ko` shorthand points at the Git maintainer's
+repository at kernel.org, and looks like this:
+
+------------
+(in .git/config)
+[remote "ko"]
+	url = kernel.org:/pub/scm/git/git.git
+	fetch = refs/heads/*:refs/remotes/ko/*
+	push = refs/heads/master
+	push = refs/heads/next
+	push = +refs/heads/pu
+	push = refs/heads/maint
+------------
+
+
+Repository Administration[[ADMINISTRATION]]
+-------------------------------------------
+
+A repository administrator uses the following tools to set up
+and maintain access to the repository by developers.
+
+  * linkgit:git-daemon[1] to allow anonymous download from
+    repository.
+
+  * linkgit:git-shell[1] can be used as a 'restricted login shell'
+    for shared central repository users.
+
+  * linkgit:git-http-backend[1] provides a server side implementation
+    of Git-over-HTTP ("Smart http") allowing both fetch and push services.
+
+  * linkgit:gitweb[1] provides a web front-end to Git repositories,
+    which can be set-up using the linkgit:git-instaweb[1] script.
+
+link:howto/update-hook-example.html[update hook howto] has a good
+example of managing a shared central repository.
+
+In addition there are a number of other widely deployed hosting, browsing
+and reviewing solutions such as:
+
+  * gitolite, gerrit code review, cgit and others.
+
+Examples
+~~~~~~~~
+We assume the following in /etc/services::
++
+------------
+$ grep 9418 /etc/services
+git		9418/tcp		# Git Version Control System
+------------
+
+Run git-daemon to serve /pub/scm from inetd.::
++
+------------
+$ grep git /etc/inetd.conf
+git	stream	tcp	nowait	nobody \
+  /usr/bin/git-daemon git-daemon --inetd --export-all /pub/scm
+------------
++
+The actual configuration line should be on one line.
+
+Run git-daemon to serve /pub/scm from xinetd.::
++
+------------
+$ cat /etc/xinetd.d/git-daemon
+# default: off
+# description: The Git server offers access to Git repositories
+service git
+{
+	disable = no
+	type            = UNLISTED
+	port            = 9418
+	socket_type     = stream
+	wait            = no
+	user            = nobody
+	server          = /usr/bin/git-daemon
+	server_args     = --inetd --export-all --base-path=/pub/scm
+	log_on_failure  += USERID
+}
+------------
++
+Check your xinetd(8) documentation and setup, this is from a Fedora system.
+Others might be different.
+
+Give push/pull only access to developers using git-over-ssh.::
+
+e.g. those using:
+`$ git push/pull ssh://host.xz/pub/scm/project`
++
+------------
+$ grep git /etc/passwd <1>
+alice:x:1000:1000::/home/alice:/usr/bin/git-shell
+bob:x:1001:1001::/home/bob:/usr/bin/git-shell
+cindy:x:1002:1002::/home/cindy:/usr/bin/git-shell
+david:x:1003:1003::/home/david:/usr/bin/git-shell
+$ grep git /etc/shells <2>
+/usr/bin/git-shell
+------------
++
+<1> log-in shell is set to /usr/bin/git-shell, which does not
+allow anything but `git push` and `git pull`.  The users require
+ssh access to the machine.
+<2> in many distributions /etc/shells needs to list what is used
+as the login shell.
+
+CVS-style shared repository.::
++
+------------
+$ grep git /etc/group <1>
+git:x:9418:alice,bob,cindy,david
+$ cd /home/devo.git
+$ ls -l <2>
+  lrwxrwxrwx   1 david git    17 Dec  4 22:40 HEAD -> refs/heads/master
+  drwxrwsr-x   2 david git  4096 Dec  4 22:40 branches
+  -rw-rw-r--   1 david git    84 Dec  4 22:40 config
+  -rw-rw-r--   1 david git    58 Dec  4 22:40 description
+  drwxrwsr-x   2 david git  4096 Dec  4 22:40 hooks
+  -rw-rw-r--   1 david git 37504 Dec  4 22:40 index
+  drwxrwsr-x   2 david git  4096 Dec  4 22:40 info
+  drwxrwsr-x   4 david git  4096 Dec  4 22:40 objects
+  drwxrwsr-x   4 david git  4096 Nov  7 14:58 refs
+  drwxrwsr-x   2 david git  4096 Dec  4 22:40 remotes
+$ ls -l hooks/update <3>
+  -r-xr-xr-x   1 david git  3536 Dec  4 22:40 update
+$ cat info/allowed-users <4>
+refs/heads/master	alice\|cindy
+refs/heads/doc-update	bob
+refs/tags/v[0-9]*	david
+------------
++
+<1> place the developers into the same git group.
+<2> and make the shared repository writable by the group.
+<3> use update-hook example by Carl from Documentation/howto/
+for branch policy control.
+<4> alice and cindy can push into master, only bob can push into doc-update.
+david is the release manager and is the only person who can
+create and push version tags.
+
+GIT
+---
+Part of the linkgit:git[1] suite