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git/Documentation/everyday.txt
Anders Kaseorg bce02c1b4d everyday: fsck and gc are not everyday operations 
Back in 2005 when this document was written, it may have made sense to
introduce ‘git fsck’ (then ‘git fsck-objects’) as the very first example
command for new users of Git 0.99.9.  Now that Git has been stable for
years and does not actually tend to eat your data, it makes significantly
less sense.  In fact, it sends an entirely wrong message.

‘git gc’ is also unnecessary for the purposes of this document, especially
with gc.auto enabled by default.

The only other commands in the “Basic Repository” section were ‘git init’
and ‘git clone’.  ‘clone’ is already listed in the “Participant” section,
so move ‘init’ to the “Standalone” section and get rid of “Basic
Repository” entirely.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-03-16 19:25:20 -07:00

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Everyday GIT With 20 Commands Or So
===================================
<<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 <<Individual Developer (Participant)>> section as well.
People who play the <<Integrator>> role need to learn some more
commands in addition to the above.
<<Repository Administration>> commands are for system
administrators who are responsible for the care and feeding
of git repositories.
Individual Developer (Standalone)[[Individual Developer (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-show-branch[1] to see where you are.
* linkgit:git-log[1] to see what happened.
* linkgit:git-checkout[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-reset[1] and linkgit:git-checkout[1] (with
pathname parameters) 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 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 checkout -b alsa-audio <1>
$ edit/compile/test
$ git checkout -- 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 reset --soft HEAD^ <6>
$ edit/compile/test
$ git diff ORIG_HEAD <7>
$ git commit -a -c ORIG_HEAD <8>
$ git checkout master <9>
$ git merge alsa-audio <10>
$ git log --since='3 days ago' <11>
$ git log v2.43.. curses/ <12>
------------
+
<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> take the last commit back, keeping what is in the working tree.
<7> look at the changes since the premature commit we took back.
<8> redo the commit undone in the previous step, using the message
you originally wrote.
<9> switch to the master branch.
<10> merge a topic branch into your master branch.
<11> review commit logs; other forms to limit output can be
combined and include `\--max-count=10` (show 10 commits),
`\--until=2005-12-10`, etc.
<12> view only the changes that touch what's in `curses/`
directory, since `v2.43` tag.
Individual Developer (Participant)[[Individual Developer (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.
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
$ edit/compile/test; git commit -a -s <1>
$ git format-patch origin <2>
$ git pull <3>
$ git log -p ORIG_HEAD.. arch/i386 include/asm-i386 <4>
$ git pull git://git.kernel.org/pub/.../jgarzik/libata-dev.git ALL <5>
$ git reset --hard ORIG_HEAD <6>
$ git gc <7>
$ git fetch --tags <8>
------------
+
<1> repeat as needed.
<2> extract patches from your branch for e-mail submission.
<3> `git pull` fetches from `origin` by default and merges into the
current branch.
<4> immediately after pulling, look at the changes done upstream
since last time we checked, only in the
area we are interested in.
<5> fetch from a specific branch from a specific repository and merge.
<6> revert the pull.
<7> garbage collect leftover objects from reverted pull.
<8> from time to time, obtain official tags from the `origin`
and store them under `.git/refs/tags/`.
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 \
master:refs/remotes/satellite/master <3>
satellite$ edit/compile/test/commit
satellite$ git push origin <4>
mothership$ cd frotz
mothership$ git checkout 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/*` tracking branches.
<3> arrange `git push` to push local `master` branch to
`remotes/satellite/master` branch of the mothership machine.
<4> push will stash our work away on `remotes/satellite/master`
tracking branch on the mothership machine. You could use this as
a back-up method.
<5> on mothership machine, merge the work done on the satellite
machine into the master branch.
Branch off of a specific tag.::
+
------------
$ git checkout -b private2.6.14 v2.6.14 <1>
$ edit/compile/test; git commit -a
$ git checkout master
$ git format-patch -k -m --stdout v2.6.14..private2.6.14 |
git am -3 -k <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".
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.
* 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
~~~~~~~~
My typical GIT day.::
+
------------
$ git status <1>
$ git show-branch <2>
$ mailx <3>
& s 2 3 4 5 ./+to-apply
& s 7 8 ./+hold-linus
& q
$ git checkout -b topic/one master
$ git am -3 -i -s -u ./+to-apply <4>
$ compile/test
$ git checkout -b hold/linus && git am -3 -i -s -u ./+hold-linus <5>
$ git checkout topic/one && git rebase master <6>
$ git checkout pu && git reset --hard next <7>
$ git merge topic/one topic/two && git merge hold/linus <8>
$ git checkout maint
$ git cherry-pick master~4 <9>
$ compile/test
$ git tag -s -m "GIT 0.99.9x" v0.99.9x <10>
$ git fetch ko && git show-branch master maint 'tags/ko-*' <11>
$ git push ko <12>
$ git push ko v0.99.9x <13>
------------
+
<1> see what I was in the middle of doing, if any.
<2> see what topic branches I have and think about how ready
they are.
<3> read mails, save ones that are applicable, and save others
that are not quite ready.
<4> apply them, interactively, with my sign-offs.
<5> create topic branch as needed and apply, again with my
sign-offs.
<6> rebase internal topic branch that has not been merged to the
master, nor 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 I did not accidentally rewind master beyond what I
already pushed out. `ko` shorthand points at the repository I have
at kernel.org, and looks like this:
+
------------
$ cat .git/remotes/ko
URL: kernel.org:/pub/scm/git/git.git
Pull: master:refs/tags/ko-master
Pull: next:refs/tags/ko-next
Pull: maint:refs/tags/ko-maint
Push: master
Push: next
Push: +pu
Push: maint
------------
+
In the output from `git show-branch`, `master` should have
everything `ko-master` has, and `next` should have
everything `ko-next` has.
<12> push out the bleeding edge.
<13> push the tag out, too.
Repository Administration[[Repository 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.
link:howto/update-hook-example.txt[update hook howto] has a good
example of managing a shared central repository.
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.::
+
------------
$ 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 should
get an 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.
HTTP server to support dumb protocol transfer.::
+
------------
dev$ git update-server-info <1>
dev$ ftp user@isp.example.com <2>
ftp> cp -r .git /home/user/myproject.git
------------
+
<1> make sure your info/refs and objects/info/packs are up-to-date
<2> upload to public HTTP server hosted by your ISP.
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