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The instructions previously available on this page have been superseded.  See [https://gitlab.kitware.com/vtk/vtk/blob/master/Documentation/dev/git/README.md here].
 
 
VTK version tracking and development is hosted by [http://git-scm.com Git].
 
 
 
=Official Repository=
 
 
 
One may browse the repository online using the [http://git.wiki.kernel.org/index.php/Gitweb Gitweb] interface at http://vtk.org/gitweb.
 
 
 
==Cloning==
 
 
 
One may clone the repository using [http://www.kernel.org/pub/software/scm/git/docs/git-clone.html git clone] through the native <code>git</code> protocol:
 
 
 
$ git clone git://vtk.org/VTK.git VTK
 
 
 
or through the (less efficient) <code>http</code> protocol:
 
 
 
$ git clone http://vtk.org/VTK.git VTK
 
 
 
All further commands work inside the local copy of the repository created by the clone:
 
 
 
$ cd VTK
 
 
 
For VTKData the URLs are
 
 
 
git://vtk.org/VTKData.git
 
http://vtk.org/VTKData.git
 
 
 
==Branches==
 
 
 
At the time of this writing the repository has the following branches:
 
 
 
* '''master''': Development (default)
 
* '''hooks''': Local commit hooks ([[#Hooks|place]] in .git/hooks)
 
 
 
Release branches converted from CVS have been artificially merged into master.
 
Actual releases have tags named by the release version number.
 
 
 
=Development=
 
 
 
We provide here a brief introduction to '''VTK''' development with Git.
 
See the [[#Resources|Resources]] below for further information such as Git tutorials.
 
 
 
==Introduction==
 
 
 
We require all commits in VTK to record valid author/committer name and email information.
 
Use [http://www.kernel.org/pub/software/scm/git/docs/git-config.html git config] to introduce yourself to Git:
 
 
 
$ git config --global user.name "Your Name"
 
$ git config --global user.email "you@yourdomain.com"
 
 
 
Note that "Your Name" is your ''real name'' (e.g. "John Doe", not "jdoe").
 
While you're at it, optionally enable color output from Git commands:
 
 
 
$ git config --global color.ui auto
 
 
 
The <code>--global</code> option stores the configuration settings in <code>~/.gitconfig</code> in your home directory so that they apply to all repositories.
 
 
 
==Hooks==
 
 
 
This step is ''optional'' but recommended.
 
 
 
The [http://www.kernel.org/pub/software/scm/git/docs/git-commit.html git commit] command creates ''local'' commits.
 
A separate [http://www.kernel.org/pub/software/scm/git/docs/git-push.html git push] step is needed to publish commits to <code>vtk.org/VTK.git</code>.
 
The <code>vtk.org</code> server enforces some rules on the commits it accepts and will reject non-conforming commits ''(TODO: document these on this page and link from here)''.
 
In order to push rejected commits, one must ''edit'' history locally to repair them before publishing.
 
 
 
Since it is possible to create many commits locally and push them all at once, we provide local Git ''hooks'' to help developers keep their individual commits clean.
 
Git provides no way to enable such hooks by default, giving developers maximum control over their local repositories.
 
We recommend enabling our hooks manually in all clones.
 
 
 
Git looks for hooks in the <code>.git/hooks</code> directory within the work tree of a local repository.
 
Create a new ''local'' repository in this directory to manage the hooks:
 
 
 
$ cd .git/hooks
 
$ git init
 
 
 
The <code>vtk.org/VTK.git</code> repository provides a <code>hooks</code> branch.
 
It will have already been fetched into your local clone.
 
Pull it from there:
 
 
 
  $ git pull .. remotes/origin/hooks
 
 
 
The hooks will now run in the outer repository to enforce some rules on commits.
 
See Git help on [http://www.kernel.org/pub/software/scm/git/docs/githooks.html githooks] for details.
 
 
 
==Workflow==
 
 
 
We've chosen to approximate our previous CVS-based development workflow after the initial move to Git, at least while things get settled.
 
See [http://www.cmake.org/Wiki/CMake/Git#Workflow here] for more detailed instructions.
 
The basic rule is to rebase your work on origin/master before pushing:
 
 
 
git fetch origin
 
git rebase origin/master
 
 
 
or
 
 
 
git pull --rebase
 
 
 
The server will refuse your push if it contains any merges.
 
Later we will move to branchy development as described in the [http://www.kernel.org/pub/software/scm/git/docs/gitworkflows.html#_managing_branches gitworkflows] man page.
 
 
 
=Publishing=
 
 
 
Authorized developers may publish work directly to <code>vtk.org/VTK.git</code> using Git's SSH protocol.
 
 
 
Note that ''we may not grant all contributors push access'' to the <code>vtk.org</code> repository.
 
The distributed nature of Git allows contributors to retain authorship credit even if they do not publish changes directly.
 
 
 
==Authentication==
 
 
 
All publishers share the <code>git@vtk.org</code> account but each uses a unique ssh key for authentication.
 
If you do not have a public/private ssh key pair, generate one:
 
 
 
$ ssh-keygen -C 'you@yourdomain.com'
 
Generating public/private rsa key pair.
 
Enter file in which to save the key ($HOME/.ssh/id_rsa):
 
Enter passphrase (empty for no passphrase): (use-a-passphrase!!)
 
Enter same passphrase again: (use-same-passphrase!!)
 
Your identification has been saved in $HOME/.ssh/id_rsa.
 
Your public key has been saved in $HOME/.ssh/id_rsa.pub.
 
 
 
To request access, fill out the [https://www.kitware.com/Admin/SendPassword.cgi Kitware Password] form.
 
Include your ssh public key, '''<code>id_rsa.pub</code>''', and a reference to someone our administrators may contact to verify your privileges.
 
 
 
===Generating an ssh key on Windows===
 
 
 
If you are familiar with generating an ssh key on Linux or Mac, you can follow the same procedure on Windows in a "Git Bash" prompt. There is an ssh-keygen program installed with msysGit to help you set up an ssh identity on a Windows machine. By default it puts the ".ssh" directory in the HOME directory, which is typically "/c/Users/Username" on Vista and Windows 7; on XP, it's "/c/Documents and Settings/Username".
 
 
 
Alternatively, you can also set up a "normal" Windows command prompt shell such that it will work with msysGit, without ever invoking the Git Bash prompt if you like. If you install msysGit and accept all its default options, "git" will not be in the PATH. However, if you add "C:\Program Files (x86)\Git\cmd" to your PATH, then only the two commands '''git''' and '''gitk''' are available to use via *.cmd script wrappers installed by msysGit. Or, if you add "C:\Program Files (x86)\Git\bin" to your PATH, then '''all''' of the command line tools that git installs are available.
 
 
 
The full PuTTY suite of tools includes an application called PuTTYgen. If you already have a private key created with PuTTYgen, you may export it to an OpenSSH identity file. Open the key using PuTTYgen and choose "Conversions > Export OpenSSH key" from the menu bar. That will allow you to save an "id_rsa" file for use in the ".ssh" directory. You can also copy and paste the public key portion of the key from the PuTTYgen text field to save into an "id_rsa.pub" file if you like. Or email it to whoever needs the public side of your key pair.
 
 
 
If you routinely set up your own command prompt environment on Windows, using msysGit from that envrionment is a cinch: just add the full path to either Git\cmd or Git\bin to your PATH. (Or, write your own git.cmd wrapper that is in your PATH that simply calls the git.cmd installed with msysGit.) And make sure you have a HOME environment variable that points to the place where the .ssh directory is.
 
 
 
==Pushing==
 
 
 
Git automatically configures a new clone to refer to its origin through a [http://www.kernel.org/pub/software/scm/git/docs/git-remote.html remote] called <code>origin</code>.
 
Initially one may [http://www.kernel.org/pub/software/scm/git/docs/git-fetch.html fetch] or [http://www.kernel.org/pub/software/scm/git/docs/git-pull.html pull] changes from <code>origin</code>,
 
but may not [http://www.kernel.org/pub/software/scm/git/docs/git-push.html push] changes to it.
 
 
 
In order to publish new commits in the <code>vtk.org</code> repository, developers must configure a ''push URL'' for the <code>origin</code>.
 
Use [http://www.kernel.org/pub/software/scm/git/docs/git-config.html git config] to specify an ssh-protocol URL:
 
 
 
$ git config remote.origin.pushurl git@vtk.org:VTK.git
 
 
 
(Note that 'pushurl' requires Git >= 1.6.4.  Use just 'url' for Git < 1.6.4.)
 
 
 
Once your push URL is configured and your key is installed for <code>git@vtk.org</code> then you can try pushing changes.
 
 
 
For VTKData, the push URL is
 
 
 
git@vtk.org:VTKData.git
 
 
 
=Resources=
 
 
 
Additional information about Git may be obtained at these sites:
 
 
 
* [http://git-scm.com Git Homepage]
 
* [http://git.wiki.kernel.org/index.php/GitDocumentation Git Documentation Wiki]
 
* [http://book.git-scm.com/ Git Community Book]
 
* [http://www.kernel.org/pub/software/scm/git/docs/everyday.html Everyday Git]
 
* [http://github.com/guides/git-cheat-sheet Git Cheat-Sheet]
 
* [http://progit.org/book/ Pro Git]
 
* [http://marklodato.github.com/visual-git-guide/ A Visual Git Reference]
 

Latest revision as of 15:42, 16 March 2015

The instructions previously available on this page have been superseded. See here.