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Everyday GIT With 20 Commands Or So
===================================
Everyday GIT With 20 Commands Or So
===================================
-GIT suite has over 100 commands, and the manual page for each of
-them discusses what the command does and how it is used in
-detail, but until you know what command should be used in order
-to achieve what you want to do, you cannot tell which manual
-page to look at, and if you know that already you do not need
-the manual.
-
-Does that mean you need to know all of them before you can use
-git? Not at all. Depending on the role you play, the set of
-commands you need to know is slightly different, but in any case
-what you need to learn is far smaller than the full set of
-commands to carry out your day-to-day work. This document is to
-serve as a cheat-sheet and a set of pointers for people playing
-various roles.
-
-<<Basic Repository>> commands are needed by people who has a
+<<Basic Repository>> commands are needed by people who have a
repository --- that is everybody, because every working tree of
git is a repository.
repository --- that is everybody, because every working tree of
git is a repository.
works alone.
If you work with other people, you will need commands listed in
works alone.
If you work with other people, you will need commands listed in
-<<Individual Developer (Participant)>> section as well.
+the <<Individual Developer (Participant)>> section as well.
-People who play <<Integrator>> role need to learn some more
+People who play the <<Integrator>> role need to learn some more
commands in addition to the above.
<<Repository Administration>> commands are for system
commands in addition to the above.
<<Repository Administration>> commands are for system
-administrators who are responsible to care and feed git
-repositories to support developers.
+administrators who are responsible for the care and feeding
+of git repositories.
Basic Repository[[Basic Repository]]
------------------------------------
Basic Repository[[Basic Repository]]
------------------------------------
-Everybody uses these commands to feed and care git repositories.
+Everybody uses these commands to maintain git repositories.
* gitlink:git-init-db[1] or gitlink:git-clone[1] to create a
new repository.
* gitlink:git-init-db[1] or gitlink:git-clone[1] to create a
new repository.
- * gitlink:git-fsck-objects[1] to validate the repository.
+ * gitlink:git-fsck-objects[1] to check the repository for errors.
- * gitlink:git-prune[1] to garbage collect crufts in the
- repository.
+ * gitlink:git-prune[1] to remove unused objects in the repository.
* gitlink:git-repack[1] to pack loose objects for efficiency.
Examples
~~~~~~~~
* gitlink:git-repack[1] to pack loose objects for efficiency.
Examples
~~~~~~~~
-Check health and remove cruft::
+Check health and remove cruft.::
+
------------
$ git fsck-objects <1>
+
------------
$ git fsck-objects <1>
$ git count-objects <2>
$ git repack <3>
$ git prune <4>
$ git count-objects <2>
$ git repack <3>
$ git prune <4>
-
+------------
++
<1> running without "--full" is usually cheap and assures the
repository health reasonably well.
<2> check how many loose objects there are and how much
<1> running without "--full" is usually cheap and assures the
repository health reasonably well.
<2> check how many loose objects there are and how much
-diskspace is wasted by not repacking.
+disk space is wasted by not repacking.
<3> without "-a" repacks incrementally. repacking every 4-5MB
of loose objects accumulation may be a good rule of thumb.
<4> after repack, prune removes the duplicate loose objects.
<3> without "-a" repacks incrementally. repacking every 4-5MB
of loose objects accumulation may be a good rule of thumb.
<4> after repack, prune removes the duplicate loose objects.
-------------
-Repack a small project into single pack::
+Repack a small project into single pack.::
+
------------
$ git repack -a -d <1>
$ git prune
------------
+
------------
$ git repack -a -d <1>
$ git prune
------------
++
+<1> pack all the objects reachable from the refs into one pack,
+then remove the other packs.
Individual Developer (Standalone)[[Individual Developer (Standalone)]]
----------------------------------------------------------------------
A standalone individual developer does not exchange patches with
Individual Developer (Standalone)[[Individual Developer (Standalone)]]
----------------------------------------------------------------------
A standalone individual developer does not exchange patches with
-other poeple, and works alone in a single repository, using the
+other people, and works alone in a single repository, using the
following commands.
* gitlink:git-show-branch[1] to see where you are.
* gitlink:git-log[1] to see what happened.
following commands.
* gitlink:git-show-branch[1] to see where you are.
* gitlink:git-log[1] to see what happened.
- * gitlink:git-whatchanged[1] to find out where things have
- come from.
-
* gitlink:git-checkout[1] and gitlink:git-branch[1] to switch
branches.
* gitlink:git-checkout[1] and gitlink:git-branch[1] to switch
branches.
Examples
~~~~~~~~
Examples
~~~~~~~~
-Extract a tarball and create a working tree and a new repository to keep track of it::
+Use a tarball as a starting point for a new repository:
+
------------
$ tar zxf frotz.tar.gz
+
------------
$ tar zxf frotz.tar.gz
$ git add . <1>
$ git commit -m 'import of frotz source tree.'
$ git tag v2.43 <2>
$ 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.
<1> add everything under the current directory.
<2> make a lightweight, unannotated tag.
-------------
-Create a topic branch and develop::
+Create a topic branch and develop.::
+
------------
$ git checkout -b alsa-audio <1>
+
------------
$ git checkout -b alsa-audio <1>
$ git pull . alsa-audio <10>
$ git log --since='3 days ago' <11>
$ git log v2.43.. curses/ <12>
$ git pull . 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
<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
you originally wrote.
<9> switch to the master branch.
<10> merge a topic branch into your master branch
you originally wrote.
<9> switch to the master branch.
<10> merge a topic branch into your master branch
-<11> or --since='aug 1', --max-count=10
+<11> review commit logs; other forms to limit output can be
+combined and include --max-count=10 (show 10 commits), --until='2005-12-10'.
<12> view only the changes that touch what's in curses/
directory, since v2.43 tag.
<12> view only the changes that touch what's in curses/
directory, since v2.43 tag.
-------------
Individual Developer (Participant)[[Individual Developer (Participant)]]
Individual Developer (Participant)[[Individual Developer (Participant)]]
learn how to communicate with others, and uses these commands in
addition to the ones needed by a standalone developer.
learn how to communicate with others, and uses these commands in
addition to the ones needed by a standalone developer.
- * gitlink:git-pull[1] from "origin" to keep up-to-date with
- the upstream.
+ * gitlink:git-clone[1] from the upstream to prime your local
+ repository.
+
+ * gitlink:git-pull[1] and gitlink:git-fetch[1] from "origin"
+ to keep up-to-date with the upstream.
- * gitlink:git-push[1] to shared repository if you adopt CVS
+ * gitlink:git-push[1] to shared repository, if you adopt CVS
style shared repository workflow.
* gitlink:git-format-patch[1] to prepare e-mail submission, if
you adopt Linux kernel-style public forum workflow.
style shared repository workflow.
* gitlink:git-format-patch[1] to prepare e-mail submission, if
you adopt Linux kernel-style public forum workflow.
-
Examples
~~~~~~~~
Examples
~~~~~~~~
-Clone the upstream and work on it. Feed changes to upstream::
+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
+
------------
$ git clone git://git.kernel.org/pub/scm/.../torvalds/linux-2.6 my2.6
$ edit/compile/test; git commit -a -s <1>
$ git format-patch origin <2>
$ git pull <3>
$ edit/compile/test; git commit -a -s <1>
$ git format-patch origin <2>
$ git pull <3>
-$ git whatchanged -p ORIG_HEAD.. arch/i386 include/asm-i386 <4>
+$ 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 prune <7>
$ git pull git://git.kernel.org/pub/.../jgarzik/libata-dev.git ALL <5>
$ git reset --hard ORIG_HEAD <6>
$ git prune <7>
-
+$ git fetch --tags <8>
+------------
++
<1> repeat as needed.
<2> extract patches from your branch for e-mail submission.
<1> repeat as needed.
<2> extract patches from your branch for e-mail submission.
-<3> "pull" fetches from "origin" by default and merges.
-<4> look at the changes since last time we checked, only in the
+<3> "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.
area we are interested in.
-<5> fetch from a specific branch from a specific repository and and merge.
+<5> fetch from a specific branch from a specific repository and merge.
<6> revert the pull.
<7> garbage collect leftover objects from reverted pull.
<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/.
+
-Branch off of a specific tag::
+Push into another repository.::
++
+------------
+satellite$ git clone mothership:frotz/.git frotz <1>
+satellite$ cd frotz
+satellite$ cat .git/remotes/origin <2>
+URL: mothership:frotz/.git
+Pull: master:origin
+satellite$ echo 'Push: master:satellite' >>.git/remotes/origin <3>
+satellite$ edit/compile/test/commit
+satellite$ git push origin <4>
+
+mothership$ cd frotz
+mothership$ git checkout master
+mothership$ git pull . satellite <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 creates this file by default. It arranges "git pull"
+to fetch and store the master branch head of mothership machine
+to local "origin" branch.
+<3> arrange "git push" to push local "master" branch to
+"satellite" branch of the mothership machine.
+<4> push will stash our work away on "satellite" 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>
+
------------
$ git checkout -b private2.6.14 v2.6.14 <1>
$ git checkout master
$ git format-patch -k -m --stdout v2.6.14..private2.6.14 |
git am -3 -k <2>
$ 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".
<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]]
Integrator[[Integrator]]
Examples
~~~~~~~~
Examples
~~~~~~~~
-My typical GIT day::
+My typical GIT day.::
+
------------
$ git status <1>
+
------------
$ git status <1>
$ git checkout topic/one && git rebase master <6>
$ git checkout pu && git reset --hard master <7>
$ git pull . topic/one topic/two && git pull . hold/linus <8>
$ git checkout topic/one && git rebase master <6>
$ git checkout pu && git reset --hard master <7>
$ git pull . topic/one topic/two && git pull . hold/linus <8>
-$ git fetch ko master:refs/tags/ko-master &&
- git show-branch master ko-master <9>
-$ git push ko <10>
$ git checkout maint
$ git checkout maint
-$ git cherry-pick master~4 <11>
+$ git cherry-pick master~4 <9>
$ compile/test
$ compile/test
-$ git tag -s -m 'GIT 0.99.9x' v0.99.9x <12>
+$ 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>
$ 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.
<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.
master, nor exposed as a part of a stable branch.
<7> restart "pu" every time from the master.
<8> and bundle topic branches still cooking.
master, nor exposed as a part of a stable branch.
<7> restart "pu" every time from the master.
<8> and bundle topic branches still cooking.
-<9> make sure I did not accidentally rewound master beyond what I
-already pushed out.
-<10> push out the bleeding edge.
-<11> backport a critical fix.
-<12> create a signed tag.
-<13> push the tag out.
+<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: maint:refs/tags/ko-maint
+Push: master
+Push: +pu
+Push: maint
------------
------------
++
+In the output from "git show-branch", "master" should have
+everything "ko-master" has.
+
+<12> push out the bleeding edge.
+<13> push the tag out, too.
Repository Administration[[Repository Administration]]
Repository Administration[[Repository Administration]]
* gitlink:git-shell[1] can be used as a 'restricted login shell'
for shared central repository users.
* gitlink: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.
+link:howto/update-hook-example.txt[update hook howto] has a good
+example of managing a shared central repository.
Examples
~~~~~~~~
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::
+Run git-daemon to serve /pub/scm from inetd.::
+
------------
+
------------
-$ grep git /etc/inet.conf
-git stream tcp nowait nobody /usr/bin/git-daemon git-daemon --inetd --syslog --export-all /pub/scm
+$ 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.
-Give push/pull only access to developers::
+Run git-daemon to serve /pub/scm from xinetd.::
+
------------
+
------------
-$ grep git /etc/shells
-/usr/bin/git-shell
-$ grep git /etc/passwd
+$ 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
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.