Revision as of 04:55, 9 October 2008

Git Phrase Book

NOTE: For increased pleasure use git 1.5 or later.

Pointers

There are plenty of good git tutorials on the net. A small collection of links can be seen below:

Setup

Getting the data

 git clone git://git.openembedded.net/FIXME openembedded.git

Upgrading your data (lurking)

 git pull --rebase

This command will fetch new objects from the server, and try to put your local changes on top of the newly fetched revisions for your current branch. If you have no local revisions you will still be updated.

Generating a ssh key

To be able to push to the OpenEmbedded git server you will need to have the right permissions. This starts with having your public ssh key on the server. Generate a key and send it to the right developers.

 ssh-keygen -t rsa -- send the resulting link to koen, mickeyl and zecke

Checking out a branch

 # See which branches are available
 git branch -a

 # In theory create a branch and switch
 git checkout -b local origin/remote

 # you will now be in the dreambox branch and track this.
 git checkout -b org.openembedded.dreambox origin/org.openembedded.dreambox

Configuring your tree for commits

 git config user.name "Your Name"
 git config user.mail "you@name"

Doing things with git

Commit Message

<package name> <version>| <package category> | <configfile/class name>: <summary> 
{  - <detail 1>
   - <detail 2>}*

Making your changes (old way)

 git add your/new/file -- if you have new files
 git commit -a         -- Commit everything

Making your changes (better way)

 git add your/changed/files
 git commit

Making your changes (a cool way)

 git add -i
 git commit

Amending to your changes

You forgot something, no big deal, change the commit

 git add your/others/changes
 git commit --amend

Commiting someones else work

 git commit --author "Other One <other@one>"

Pushing your changes

 git push origin org.openembedded.dev -- just pushes the org.openembedded.dev
 git push origin org.openembedded.dev:yourname/testbranch -- just pushes your things to a test branch. Use the right branch! dangerous!
 git push origin :yourname/testbranch -- delete a branch

Dealing with conflicts

Git will tell you what needs resolving. You can use kdiff3, meld, or many other tools to resolve the conflict. Don't be afraid you can easily redo and undo everything.

 git pull --rebase -- Conflicts from here or something else
 git status
 git mergetool --tool=TOOL filename -- Starts interactive resolver, TOOL can be kdiff3, meld or anything else
 git rebase --continue or similar once everything got resolved

Working with git

Feature branches

Create your own short lived feature branch

 git checkout -b yourname/yourfeature origin/org.openembedded.dev

Push your feature branch

 git push origin yourname/yourfeature

Delete your branch after it was merged

 git push origin :yourname/yourfeature

Upgrade/Rebase your branch to the latest version

 git fetch origin
 git rebase origin/org.openembedded.dev

Change your history

 git rebase -i origin/org.openembedded.dev -- select edit, squash, pick to say what to do with the commits
 git rebase --abort to abort it
 git reflog to help you to go back

Seeing changes

Log

 git log branch -- See what happened in a branch
 git show --color (COMMIT) -- See the change, HEAD or branch name will work twoo
 git show --color HEAD -- foo/file -- Only show you change on foo/file
 gitk -- Graphical browser

What did you change

 git rev-list origin/org.openembedded.dev.. -- Lists you the revs that are only in your branch compared to org.openembedded.dev

Other Interesting commands

 git fetch -- fetch new revisions from all remote repositories
 git branch -- show you local branches and which branch you are in
 git branch -a -- show you all branches
 git checkout -b MYNAME origin/THEIRNAME -- create a branch and switch to it
 git push origin org.openembedded.dev -- upgrade a branch
 git reflog
 git reset REF -- Change your index to be at the state of REF

Examples

Example 1:

 vi packages/gaim/gaim.inc
 git commit packages/gaim/gaim.inc
 git pull --rebase

should have a log message like this:

gaim: make sure do_install does its job in gaim.inc
* install lib to ${libdir} instead of /usr/lib
* remove executable bits from docs

Example 2:

diff /tmp/foo.c /oe/work/gtk+-2.8.4-r0/gtk+-2.8.4/src/foo.c > gtk-2.8.4/fix-foo.patch
vi gtk+_2.8.4.bb
git add gtk-2.8.4/fix-foo.patch
git commit gtk-2.8.4/fix-foo.patch gtk+_2.8.4.bb
git pull --rebase