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440 lines
14 KiB
440 lines
14 KiB
Everyday GIT With 20 Commands Or So |
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=================================== |
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GIT suite has over 100 commands, and the manual page for each of |
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them discusses what the command does and how it is used in |
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detail, but until you know what command should be used in order |
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to achieve what you want to do, you cannot tell which manual |
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page to look at, and if you know that already you do not need |
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the manual. |
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Does that mean you need to know all of them before you can use |
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git? Not at all. Depending on the role you play, the set of |
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commands you need to know is slightly different, but in any case |
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what you need to learn is far smaller than the full set of |
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commands to carry out your day-to-day work. This document is to |
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serve as a cheat-sheet and a set of pointers for people playing |
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various roles. |
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<<Basic Repository>> commands are needed by people who has a |
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repository --- that is everybody, because every working tree of |
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git is a repository. |
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In addition, <<Individual Developer (Standalone)>> commands are |
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essential for anybody who makes a commit, even for somebody who |
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works alone. |
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If you work with other people, you will need commands listed in |
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<<Individual Developer (Participant)>> section as well. |
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People who play <<Integrator>> role need to learn some more |
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commands in addition to the above. |
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<<Repository Administration>> commands are for system |
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administrators who are responsible to care and feed git |
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repositories to support developers. |
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Basic Repository[[Basic Repository]] |
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------------------------------------ |
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Everybody uses these commands to feed and care git repositories. |
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* gitlink:git-init-db[1] or gitlink:git-clone[1] to create a |
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new repository. |
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* gitlink:git-fsck-objects[1] to validate the repository. |
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* gitlink:git-prune[1] to garbage collect crufts in the |
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repository. |
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* gitlink:git-repack[1] to pack loose objects for efficiency. |
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Examples |
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~~~~~~~~ |
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Check health and remove cruft.:: |
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+ |
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------------ |
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$ git fsck-objects <1> |
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$ git prune |
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$ git count-objects <2> |
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$ git repack <3> |
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$ git prune <4> |
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------------ |
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+ |
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<1> running without "--full" is usually cheap and assures the |
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repository health reasonably well. |
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<2> check how many loose objects there are and how much |
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disk space is wasted by not repacking. |
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<3> without "-a" repacks incrementally. repacking every 4-5MB |
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of loose objects accumulation may be a good rule of thumb. |
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<4> after repack, prune removes the duplicate loose objects. |
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Repack a small project into single pack.:: |
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+ |
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------------ |
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$ git repack -a -d <1> |
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$ git prune |
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------------ |
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+ |
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<1> pack all the objects reachable from the refs into one pack |
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and remove unneeded other packs |
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Individual Developer (Standalone)[[Individual Developer (Standalone)]] |
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---------------------------------------------------------------------- |
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A standalone individual developer does not exchange patches with |
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other people, and works alone in a single repository, using the |
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following commands. |
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* gitlink:git-show-branch[1] to see where you are. |
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* gitlink:git-log[1] to see what happened. |
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* gitlink:git-whatchanged[1] to find out where things have |
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come from. |
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* gitlink:git-checkout[1] and gitlink:git-branch[1] to switch |
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branches. |
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* gitlink:git-add[1] and gitlink:git-update-index[1] to manage |
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the index file. |
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* gitlink:git-diff[1] and gitlink:git-status[1] to see what |
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you are in the middle of doing. |
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* gitlink:git-commit[1] to advance the current branch. |
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* gitlink:git-reset[1] and gitlink:git-checkout[1] (with |
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pathname parameters) to undo changes. |
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* gitlink:git-pull[1] with "." as the remote to merge between |
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local branches. |
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* gitlink:git-rebase[1] to maintain topic branches. |
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* gitlink:git-tag[1] to mark known point. |
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Examples |
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~~~~~~~~ |
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Extract a tarball and create a working tree and a new repository to keep track of it.:: |
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+ |
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------------ |
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$ tar zxf frotz.tar.gz |
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$ cd frotz |
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$ git-init-db |
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$ git add . <1> |
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$ git commit -m 'import of frotz source tree.' |
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$ git tag v2.43 <2> |
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------------ |
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+ |
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<1> add everything under the current directory. |
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<2> make a lightweight, unannotated tag. |
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Create a topic branch and develop.:: |
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+ |
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------------ |
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$ git checkout -b alsa-audio <1> |
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$ edit/compile/test |
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$ git checkout -- curses/ux_audio_oss.c <2> |
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$ git add curses/ux_audio_alsa.c <3> |
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$ edit/compile/test |
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$ git diff <4> |
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$ git commit -a -s <5> |
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$ edit/compile/test |
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$ git reset --soft HEAD^ <6> |
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$ edit/compile/test |
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$ git diff ORIG_HEAD <7> |
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$ git commit -a -c ORIG_HEAD <8> |
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$ git checkout master <9> |
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$ git pull . alsa-audio <10> |
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$ git log --since='3 days ago' <11> |
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$ git log v2.43.. curses/ <12> |
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------------ |
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+ |
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<1> create a new topic branch. |
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<2> revert your botched changes in "curses/ux_audio_oss.c". |
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<3> you need to tell git if you added a new file; removal and |
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modification will be caught if you do "commit -a" later. |
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<4> to see what changes you are committing. |
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<5> commit everything as you have tested, with your sign-off. |
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<6> take the last commit back, keeping what is in the working tree. |
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<7> look at the changes since the premature commit we took back. |
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<8> redo the commit undone in the previous step, using the message |
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you originally wrote. |
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<9> switch to the master branch. |
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<10> merge a topic branch into your master branch |
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<11> review commit logs; other forms to limit output can be |
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combined and include --max-count=10 (show 10 commits), --until='2005-12-10'. |
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<12> view only the changes that touch what's in curses/ |
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directory, since v2.43 tag. |
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Individual Developer (Participant)[[Individual Developer (Participant)]] |
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------------------------------------------------------------------------ |
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A developer working as a participant in a group project needs to |
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learn how to communicate with others, and uses these commands in |
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addition to the ones needed by a standalone developer. |
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* gitlink:git-clone[1] from the upstream to prime your local |
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repository. |
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* gitlink:git-pull[1] and gitlink:git-fetch[1] from "origin" |
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to keep up-to-date with the upstream. |
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* gitlink:git-push[1] to shared repository, if you adopt CVS |
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style shared repository workflow. |
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* gitlink:git-format-patch[1] to prepare e-mail submission, if |
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you adopt Linux kernel-style public forum workflow. |
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Examples |
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~~~~~~~~ |
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Clone the upstream and work on it. Feed changes to upstream.:: |
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+ |
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------------ |
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$ git clone git://git.kernel.org/pub/scm/.../torvalds/linux-2.6 my2.6 |
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$ cd my2.6 |
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$ edit/compile/test; git commit -a -s <1> |
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$ git format-patch origin <2> |
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$ git pull <3> |
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$ git whatchanged -p ORIG_HEAD.. arch/i386 include/asm-i386 <4> |
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$ git pull git://git.kernel.org/pub/.../jgarzik/libata-dev.git ALL <5> |
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$ git reset --hard ORIG_HEAD <6> |
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$ git prune <7> |
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$ git fetch --tags <8> |
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------------ |
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+ |
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<1> repeat as needed. |
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<2> extract patches from your branch for e-mail submission. |
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<3> "pull" fetches from "origin" by default and merges into the |
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current branch. |
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<4> immediately after pulling, look at the changes done upstream |
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since last time we checked, only in the |
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area we are interested in. |
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<5> fetch from a specific branch from a specific repository and merge. |
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<6> revert the pull. |
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<7> garbage collect leftover objects from reverted pull. |
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<8> from time to time, obtain official tags from the "origin" |
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and store them under .git/refs/tags/. |
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Push into another repository.:: |
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+ |
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------------ |
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satellite$ git clone mothership:frotz/.git frotz <1> |
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satellite$ cd frotz |
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satellite$ cat .git/remotes/origin <2> |
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URL: mothership:frotz/.git |
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Pull: master:origin |
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satellite$ echo 'Push: master:satellite' >>.git/remotes/origin <3> |
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satellite$ edit/compile/test/commit |
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satellite$ git push origin <4> |
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mothership$ cd frotz |
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mothership$ git checkout master |
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mothership$ git pull . satellite <5> |
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------------ |
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+ |
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<1> mothership machine has a frotz repository under your home |
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directory; clone from it to start a repository on the satellite |
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machine. |
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<2> clone creates this file by default. It arranges "git pull" |
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to fetch and store the master branch head of mothership machine |
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to local "origin" branch. |
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<3> arrange "git push" to push local "master" branch to |
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"satellite" branch of the mothership machine. |
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<4> push will stash our work away on "satellite" branch on the |
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mothership machine. You could use this as a back-up method. |
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<5> on mothership machine, merge the work done on the satellite |
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machine into the master branch. |
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Branch off of a specific tag.:: |
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+ |
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------------ |
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$ git checkout -b private2.6.14 v2.6.14 <1> |
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$ edit/compile/test; git commit -a |
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$ git checkout master |
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$ git format-patch -k -m --stdout v2.6.14..private2.6.14 | |
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git am -3 -k <2> |
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------------ |
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+ |
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<1> create a private branch based on a well known (but somewhat behind) |
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tag. |
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<2> forward port all changes in private2.6.14 branch to master branch |
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without a formal "merging". |
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Integrator[[Integrator]] |
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------------------------ |
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A fairly central person acting as the integrator in a group |
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project receives changes made by others, reviews and integrates |
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them and publishes the result for others to use, using these |
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commands in addition to the ones needed by participants. |
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* gitlink:git-am[1] to apply patches e-mailed in from your |
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contributors. |
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* gitlink:git-pull[1] to merge from your trusted lieutenants. |
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* gitlink:git-format-patch[1] to prepare and send suggested |
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alternative to contributors. |
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* gitlink:git-revert[1] to undo botched commits. |
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* gitlink:git-push[1] to publish the bleeding edge. |
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Examples |
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~~~~~~~~ |
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My typical GIT day.:: |
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+ |
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------------ |
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$ git status <1> |
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$ git show-branch <2> |
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$ mailx <3> |
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& s 2 3 4 5 ./+to-apply |
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& s 7 8 ./+hold-linus |
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& q |
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$ git checkout master |
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$ git am -3 -i -s -u ./+to-apply <4> |
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$ compile/test |
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$ git checkout -b hold/linus && git am -3 -i -s -u ./+hold-linus <5> |
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$ git checkout topic/one && git rebase master <6> |
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$ git checkout pu && git reset --hard master <7> |
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$ git pull . topic/one topic/two && git pull . hold/linus <8> |
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$ git checkout maint |
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$ git cherry-pick master~4 <9> |
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$ compile/test |
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$ git tag -s -m 'GIT 0.99.9x' v0.99.9x <10> |
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$ git fetch ko && git show-branch master maint 'tags/ko-*' <11> |
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$ git push ko <12> |
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$ git push ko v0.99.9x <13> |
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------------ |
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+ |
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<1> see what I was in the middle of doing, if any. |
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<2> see what topic branches I have and think about how ready |
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they are. |
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<3> read mails, save ones that are applicable, and save others |
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that are not quite ready. |
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<4> apply them, interactively, with my sign-offs. |
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<5> create topic branch as needed and apply, again with my |
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sign-offs. |
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<6> rebase internal topic branch that has not been merged to the |
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master, nor exposed as a part of a stable branch. |
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<7> restart "pu" every time from the master. |
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<8> and bundle topic branches still cooking. |
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<9> backport a critical fix. |
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<10> create a signed tag. |
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<11> make sure I did not accidentally rewind master beyond what I |
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already pushed out. "ko" shorthand points at the repository I have |
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at kernel.org, and looks like this: |
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$ cat .git/remotes/ko |
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URL: kernel.org:/pub/scm/git/git.git |
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Pull: master:refs/tags/ko-master |
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Pull: maint:refs/tags/ko-maint |
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Push: master |
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Push: +pu |
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Push: maint |
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In the output from "git show-branch", "master" should have |
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everything "ko-master" has. |
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<12> push out the bleeding edge. |
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<13> push the tag out, too. |
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Repository Administration[[Repository Administration]] |
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------------------------------------------------------ |
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A repository administrator uses the following tools to set up |
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and maintain access to the repository by developers. |
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* gitlink:git-daemon[1] to allow anonymous download from |
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repository. |
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* gitlink:git-shell[1] can be used as a 'restricted login shell' |
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for shared central repository users. |
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link:howto/update-hook-example.txt[update hook howto] has a good |
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example of managing a shared central repository. |
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Examples |
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~~~~~~~~ |
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Run git-daemon to serve /pub/scm from inetd.:: |
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+ |
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------------ |
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$ grep git /etc/inetd.conf |
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git stream tcp nowait nobody \ |
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/usr/bin/git-daemon git-daemon --inetd --syslog --export-all /pub/scm |
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------------ |
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+ |
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The actual configuration line should be on one line. |
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Give push/pull only access to developers.:: |
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+ |
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------------ |
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$ grep git /etc/passwd <1> |
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alice:x:1000:1000::/home/alice:/usr/bin/git-shell |
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bob:x:1001:1001::/home/bob:/usr/bin/git-shell |
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cindy:x:1002:1002::/home/cindy:/usr/bin/git-shell |
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david:x:1003:1003::/home/david:/usr/bin/git-shell |
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$ grep git /etc/shells <2> |
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/usr/bin/git-shell |
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------------ |
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+ |
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<1> log-in shell is set to /usr/bin/git-shell, which does not |
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allow anything but "git push" and "git pull". The users should |
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get an ssh access to the machine. |
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<2> in many distributions /etc/shells needs to list what is used |
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as the login shell. |
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CVS-style shared repository.:: |
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+ |
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------------ |
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$ grep git /etc/group <1> |
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git:x:9418:alice,bob,cindy,david |
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$ cd /home/devo.git |
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$ ls -l <2> |
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lrwxrwxrwx 1 david git 17 Dec 4 22:40 HEAD -> refs/heads/master |
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drwxrwsr-x 2 david git 4096 Dec 4 22:40 branches |
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-rw-rw-r-- 1 david git 84 Dec 4 22:40 config |
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-rw-rw-r-- 1 david git 58 Dec 4 22:40 description |
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drwxrwsr-x 2 david git 4096 Dec 4 22:40 hooks |
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-rw-rw-r-- 1 david git 37504 Dec 4 22:40 index |
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drwxrwsr-x 2 david git 4096 Dec 4 22:40 info |
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drwxrwsr-x 4 david git 4096 Dec 4 22:40 objects |
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drwxrwsr-x 4 david git 4096 Nov 7 14:58 refs |
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drwxrwsr-x 2 david git 4096 Dec 4 22:40 remotes |
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$ ls -l hooks/update <3> |
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-r-xr-xr-x 1 david git 3536 Dec 4 22:40 update |
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$ cat info/allowed-users <4> |
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refs/heads/master alice\|cindy |
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refs/heads/doc-update bob |
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refs/tags/v[0-9]* david |
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------------ |
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+ |
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<1> place the developers into the same git group. |
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<2> and make the shared repository writable by the group. |
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<3> use update-hook example by Carl from Documentation/howto/ |
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for branch policy control. |
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<4> alice and cindy can push into master, only bob can push into doc-update. |
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david is the release manager and is the only person who can |
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create and push version tags. |
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HTTP server to support dumb protocol transfer.:: |
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+ |
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------------ |
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dev$ git update-server-info <1> |
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dev$ ftp user@isp.example.com <2> |
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ftp> cp -r .git /home/user/myproject.git |
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------------ |
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+ |
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<1> make sure your info/refs and objects/info/packs are up-to-date |
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<2> upload to public HTTP server hosted by your ISP.
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