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diff --git a/Documentation/everyday.txt b/Documentation/everyday.txt new file mode 100644 index 0000000000..2ad2d61300 --- /dev/null +++ b/Documentation/everyday.txt @@ -0,0 +1,440 @@ +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 +repository --- that is everybody, because every working tree of +git is a repository. + +In addition, <<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 +<<Individual Developer (Participant)>> section as well. + +People who play <<Integrator>> role need to learn some more +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. + + +Basic Repository[[Basic Repository]] +------------------------------------ + +Everybody uses these commands to feed and care git repositories. + + * 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-prune[1] to garbage collect crufts in the + repository. + + * gitlink:git-repack[1] to pack loose objects for efficiency. + +Examples +~~~~~~~~ + +Check health and remove cruft.:: ++ +------------ +$ git fsck-objects <1> +$ git prune +$ 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 +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. + +Repack a small project into single pack.:: ++ +------------ +$ git repack -a -d <1> +$ git prune +------------ ++ +<1> pack all the objects reachable from the refs into one pack +and remove unneeded other packs + + +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. + + * 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-add[1] and gitlink:git-update-index[1] to manage + the index file. + + * gitlink:git-diff[1] and gitlink:git-status[1] to see what + you are in the middle of doing. + + * gitlink:git-commit[1] to advance the current branch. + + * gitlink:git-reset[1] and gitlink:git-checkout[1] (with + pathname parameters) to undo changes. + + * gitlink:git-pull[1] with "." as the remote to merge between + local branches. + + * gitlink:git-rebase[1] to maintain topic branches. + + * gitlink:git-tag[1] to mark known point. + +Examples +~~~~~~~~ + +Extract a tarball and create a working tree and a new repository to keep track of it.:: ++ +------------ +$ tar zxf frotz.tar.gz +$ cd frotz +$ git-init-db +$ 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 <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 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 +modification will be caught if you do "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'. +<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. + + * 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 + style shared repository workflow. + + * gitlink: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 whatchanged -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 fetch --tags <8> +------------ ++ +<1> repeat as needed. +<2> extract patches from your branch for e-mail submission. +<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. +<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/.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> +$ 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. + + * gitlink:git-am[1] to apply patches e-mailed in from your + contributors. + + * gitlink:git-pull[1] to merge from your trusted lieutenants. + + * gitlink:git-format-patch[1] to prepare and send suggested + alternative to contributors. + + * gitlink:git-revert[1] to undo botched commits. + + * gitlink: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 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 master <7> +$ git pull . topic/one topic/two && git pull . 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 master. +<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: 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]] +------------------------------------------------------ + +A repository administrator uses the following tools to set up +and maintain access to the repository by developers. + + * gitlink:git-daemon[1] to allow anonymous download from + repository. + + * 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. + + +Examples +~~~~~~~~ +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 --syslog --export-all /pub/scm +------------ ++ +The actual configuration line should be on one line. + +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. |