Difference between revisions of "ITK/Git"

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__TOC__
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{{ Historical }}
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==Introduction==
  
 
ITK version tracking and development is hosted by [http://git-scm.com Git].
 
ITK version tracking and development is hosted by [http://git-scm.com Git].
 +
Please select a task for further instructions:
  
=Official Repository=
+
{|border="0"
 
+
|-
One may browse the repository online using the [http://git.wiki.kernel.org/index.php/Gitweb Gitweb] interface at http://itk.org/gitweb.
+
|width=70%|
 
+
Main Tasks:
==Cloning==
 
 
 
These instructions assume a command prompt is available with <code>git</code> in the path.
 
See our Git [[Git/Download|download instructions]] for help installing Git.
 
 
 
Clone ITK using the command
 
 
 
$ git clone git://itk.org/ITK.git
 
 
 
If your institution's firewall blocks the Git port for outgoing connections you may see an error similar to:
 
 
 
Initialized empty Git repository in C:/abc/ITK/.git/itk.org[0: 66.194.253.19]:
 
errno=No such file or directory
 
fatal: unable to connect a socket (No such file or directory)
 
 
 
In that case, see [[#Firewall_Blocks_Port_9418|below]].
 
 
 
If you want to run tests, add the <code>--recursive</code> option to download the <code>Testing/Data</code> submodule.
 
 
 
$ git clone --recursive git://itk.org/ITK.git
 
 
 
This requires Git 1.6.5 or higher. If you do not have it, see [[#Git Below 1.6.5|below]].
 
 
 
All further commands work inside the local copy of the repository created by the clone:
 
 
 
$ cd ITK
 
 
 
If you already cloned and want to add the <code>Testing/Data</code> submodule then run
 
 
 
$ git submodule update --init
 
 
 
For ITKApps, use the url
 
 
 
git://itk.org/ITKApps.git
 
 
 
instead.
 
 
 
==Updating==
 
 
 
If you have made no local commits and simply want to update your clone with the latest changes, run
 
 
 
$ git pull
 
$ git submodule update
 
 
 
If you know you do not have the <code>Testing/Data</code> submodule checked out then you can skip the submodule update command.
 
 
 
==Branches==
 
 
 
At the time of this writing the repository has the following branches:
 
 
 
* '''master''': Development (default)
 
* '''release''': Release maintenance
 
* '''nightly-master''': Follows '''master''', updated at 01:00 UTC
 
* '''hooks''': Local commit hooks ([[Git/Hooks#Local|place]] in .git/hooks)
 
* '''dashboard''': Dashboard script (see [[#Dashboard|below]])
 
 
 
Release branches converted from CVS have been artificially merged into master.
 
Actual releases have tags named by the release version number.
 
 
 
After cloning your local repository will be configured to follow the upstream '''master''' branch by default.
 
One may create a local branch to track another upstream branch using [http://www.kernel.org/pub/software/scm/git/docs/git-checkout.html git checkout]:
 
 
 
$ git checkout -b release origin/release
 
 
 
As a shortcut with Git >= 1.6.5 one may choose a branch during the initial clone:
 
 
 
$ git clone -b release git://itk.org/ITK.git ITKRel
 
 
 
=Development=
 
 
 
ITK development uses a [[Git/Workflow/Topic|branchy workflow]] based on topic branches.
 
Currently we use a single '''master''' integration branch for development and one '''release''' branch for release maintenance.
 
 
 
==Workflow==
 
 
 
Our collaboration workflow consists of three main steps:
 
 
 
# Create Topics: [[#Local_Development|Develop Locally]]
 
# Share Topics: [[#Code_Review|Code Review with Gerrit]]
 
# Integrate Topics: [[#Topic_Stage|Merge using Topic Stage]]
 
 
 
[[image:ITK-Git-Gerrit-Stage-Workflow-A.png|529px]]
 
 
 
==Local Development==
 
 
 
We provide here a brief introduction to local '''ITK''' development with Git.
 
See the [[Git/Resources|Resources]] page for further information such as Git tutorials.
 
 
 
===Introduction===
 
 
 
These steps are a one-time setup per-user per-machine.
 
 
 
We require all commits in ITK 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
 
 
 
If less displays strange characters and no color, your LESS environment variable may already be set. You can override the less options with:
 
 
 
$ git config --global core.pager "less -FXRS"
 
 
 
The <code>--global</code> option stores the configuration settings in <code>~/.gitconfig</code> in your home directory so that they apply to all repositories.
 
 
 
===Local Clone===
 
 
 
Create a local clone of the repository to get a work tree for local development.
 
See instructions [[#Cloning|above]].
 
 
 
===Hooks===
 
 
 
This step should be done once for each local clone of the ITK repository.
 
If you forget this step instructions will be printed on the first attempt to "<code>git commit</code>".
 
 
 
The '''hooks''' branch provides local commit hooks to be placed in <code>.git/hooks</code>.
 
It is shared by many <code>public.kitware.com</code> repositories.
 
See the general [[Git/Hooks|hooks]] information page for details.
 
 
 
===Local Commits===
 
 
 
Develop locally on a [[Git/Workflow/Topic#Naming_Topics|well-named]] ''topic'' branch:
 
 
 
$ git checkout -b my-cool-feature origin/master
 
$ edit ''files''
 
$ git add ''files''
 
$ git commit
 
 
 
Use the editor to enter a descriptive message (leave the message blank to abort the commit).
 
Start with a one-line summary (suitable for use as an email subject line), then leave a blank line, then use free-form paragraph text to describe the change.
 
 
 
==Code Review==
 
 
 
We use [http://code.google.com/p/gerrit/ Gerrit Code Review] to perform online code reviews.
 
See these pages for details:
 
 
 
* [[ITK/Gerrit]]
 
* [[ITK/Gerrit/Primer]]
 
 
 
Once a change is reviewed and approved in Gerrit, an ITK developer with access to the upstream repository must integrate the change using the ITK Topic Stage, covered next.
 
 
 
==Topic Stage==
 
 
 
We provide a "[http://itk.org/stage/ITK.git ITK Topic Stage]" repository to which developers may publish arbitrary topic branches and request automatic merges.
 
 
 
The topic stage URLs are
 
 
 
* <code>git://itk.org/stage/ITK.git</code> (clone, fetch)
 
* <code>http://itk.org/stage/ITK.git</code> (clone, fetch, gitweb)
 
* <code>git@itk.org:stage/ITK.git</code> (push)
 
 
 
See our [http://public.kitware.com/Wiki/Git/Workflow/Stage Topic Stage Workflow] documentation for general instructions.
 
''(Currently ITK does not have a '''next''' branch.  Just skip that part of the instructions and merge directly to master.)''
 
When accessing the ITK stage, one may optionally substitute
 
"<code>ssh git@itk.org stage ITK ...</code>"
 
for
 
"<code>ssh git@public.kitware.com stage <repo> ...</code>"
 
in the ssh command-line interface.
 
 
 
{| border="0"
 
!colspan=2|Stage Usage Summary
 
 
|-
 
|-
|align="center"|
 
'''Initial Setup:'''
 
 
|
 
|
$ git remote add stage git://itk.org/stage/ITK.git
+
:*<span style="font-size: 1.5em">[[Git/Download|Install Git]]</span> - Git 1.6.6 or greater is preferred (required for development)
$ git config remote.stage.pushurl git@itk.org:stage/ITK.git
 
 
|-
 
|-
|align="center"|
 
'''Fetch Staged Topics:'''
 
 
|
 
|
$ git fetch stage --prune
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:*<span style="font-size: 1.5em">[[ITK/Git/Download|Download ITK]] - Users start here</span>
 
|-
 
|-
|align="center"|
 
'''Create Local Topic:'''
 
 
|
 
|
$ git checkout -b ''topic-name'' origin/master
+
:*<span style="font-size: 1.5em">[[ITK/Git/Develop|Develop ITK]] - Contributors start here</span>
$ edit files
 
$ git commit
 
 
|-
 
|-
|align="center"|
 
'''Stage Current Topic:'''
 
 
|
 
|
$ git push stage HEAD
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Other Tasks:
 
|-
 
|-
|align="center"|
 
'''Print Staged Topics:'''
 
 
|
 
|
$ ssh git@itk.org stage ITK print
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:*<span style="font-size: 1.5em">[[ITK/Git/Dashboard|Test ITK]]</span> - CDash client setup
 
|-
 
|-
|align="center"|
 
'''Merge Staged Topic:'''
 
 
|
 
|
$ ssh git@itk.org stage ITK merge ''topic-name''
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:*<span style="font-size: 1.5em">[[Git/Resources|Learn Git]]</span> - Third-party documentation
 
|}
 
|}
  
Note that the stage implementation is not ITK-specific and is used for other projects too.
+
''The remainder of this page provides reference information and links.  It is not intended to provide instructions.''
If the merge attempt conflicts it may print instructions for performing the merge manually.
 
'''Ignore''' these instructions; you will not be able to push the merge commit directly.
 
Instead, identify the commit that conflicts with yours, merge it into your topic locally, push the topic to the stage again, and then repeat the merge request.
 
  
=Publishing=
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==Repositories==
  
==Pushing==
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One may browse the repositories online using the [https://git.wiki.kernel.org/index.php/Gitweb Gitweb] interface at http://itk.org/gitweb.
  
Authorized developers may publish work directly to <code>itk.org/ITK.git</code> using Git's SSH protocol.
+
{|border="1" cellspacing="0" cellpadding="3"
To request access, fill out the [https://www.kitware.com/Admin/SendPassword.cgi Kitware Password] form.
+
!Repository
 +
!Purpose
 +
!Access
 +
!URL
 +
|-
 +
|rowspan=3|<code>ITK.git</code>
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|rowspan=3|Insight Toolkit
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|clone (git)
 +
|<code>git://itk.org/ITK.git</code>
 +
|-
 +
|clone (http)
 +
|<code>http://itk.org/ITK.git</code>
 +
|-
 +
|push (ssh)
 +
|<code>git@itk.org:ITK.git</code>
 +
|-
 +
|rowspan=3|<code>stage/ITK.git</code>
 +
|rowspan=3|ITK Topic Stage
 +
|clone (git)
 +
|<code>git://itk.org/stage/ITK.git</code>
 +
|-
 +
|clone (http)
 +
|<code>http://itk.org/stage/ITK.git</code>
 +
|-
 +
|push (ssh)
 +
|<code>git@itk.org:stage/ITK.git</code>
 +
|-
 +
|rowspan=3|<code>ITKApps.git</code>
 +
|rowspan=3|Insight Applications
 +
|clone (git)
 +
|<code>git://itk.org/ITKApps.git</code>
 +
|-
 +
|clone (http)
 +
|<code>http://itk.org/ITKApps.git</code>
 +
|-
 +
|push (ssh)
 +
|<code>git@itk.org:ITKApps.git</code>
 +
|-
 +
|rowspan=3|<code>ITKData.git</code>
 +
|rowspan=3|ITK <code>Testing/Data</code> Submodule
 +
|clone (git)
 +
|<code>git://itk.org/ITKData.git</code>
 +
|-
 +
|clone (http)
 +
|<code>http://itk.org/ITKData.git</code>
 +
|-
 +
|push (ssh)
 +
|<code>git@itk.org:ITKData.git</code>
 +
|}
  
See the [[Git/Publish#Push_Access|push instructions]] for details.
+
==Branches==
  
For ITK, configure the push URL:
+
At the time of this writing the <code>ITK.git</code> repository has the following branches:
  
git config remote.origin.pushurl git@itk.org:ITK.git
+
* '''master''': Development (default)
 +
* '''release''': Maintenance of latest release
 +
* '''release-3.20''': Maintenance of the ITKv3 series
 +
* '''nightly-master''': Follows '''master''', updated at 01:00 UTC
 +
* '''hooks''': Local commit hooks ([[Git/Hooks#Local|place]] in .git/hooks)
 +
* '''dashboard''': Dashboard script ([[ITK/Git/Dashboard|setup]] a CDash client)
  
For ITKApps, configure the push URL:
+
Release branches converted from CVS have been artificially merged into master.
 
+
Actual releases have tags named by the release version number.
git config remote.origin.pushurl git@itk.org:ITKApps.git
 
 
 
===Update Hook===
 
 
 
The itk.org repository has an <code>update</code> hook.
 
When someone tries to push changes to the repository it checks the commits as documented [[Git/Hooks#update|here]].
 
 
 
==Patches==
 
 
 
Contributions of bug fixes and features are commonly produced by the community.
 
Patches are a convenient method for managing such contributions.
 
 
 
One may send patches to one of our mailing lists:
 
 
 
* [http://www.itk.org/mailman/listinfo/insight-users ITK Users Mailing List]
 
* [http://www.itk.org/mailman/listinfo/insight-developers ITK Developers Mailing List]
 
 
 
See our [[Git/Publish#Patches|patch instructions]] for details.
 
 
 
=Submodules=
 
 
 
In the ITK.git repository, <code>Testing/Data</code> is not really a directory.
 
It is a ''submodule'', meaning that its content does not actually appear in ITK.git, but in the ITKData.git repository.
 
In ITK.git Git stores in the <code>Testing</code> directory an entry called "<code>Data</code>" that refers to a ''commit'' from the ITKData repository.
 
Indeed, one can see this using a low-level "<code>git ls-tree</code>" command:
 
 
 
$ git ls-tree -r 9ec7c03d -- Testing/Data
 
160000 commit bc9550f3215104818f0464fd6ede7c8ea3462aeb  Testing/Data
 
              ^^^^^^^^
 
We can view this commit from ITKData.git: http://itk.org/gitweb?p=ITKData.git;a=commitdiff;h=bc9550f3.
 
 
 
This approach allows us to keep the bulky data out of the main repository and version it separately.
 
Every version of ITK throughout history refers to the exact version of ITKData that it needs using this submodule link.
 
 
 
==Updating Data==
 
 
 
One can think of the <code>Testing/Data</code> entry in ITK's tree kind of like a '''file''' that tells Git which version of ITKData.git we want.
 
If we want to change the version of ITKData.git to which we refer from ITK (perhaps because we've created a new commit in ITKData with some updated images), we commit a change to ITK that updates the Testing/Data "file" to refer to the new version.
 
 
 
First, make the changes to ITK needed to use the new data correctly:
 
 
 
$ git checkout -b my-new-test origin/master
 
$ git submodule update
 
$ edit ''files''
 
 
 
Then, make the change to Testing/Data and publish it:
 
 
 
$ cd Testing/Data
 
$ git checkout master
 
$ git pull --rebase origin master
 
$ edit ''data-files''
 
$ git add -- ''data-files''
 
$ git commit
 
$ git config remote.origin.pushurl git@itk.org:ITKData.git
 
$ git push origin master
 
$ cd ../..
 
 
 
Finally, update ITK to reference the new version of ITKData.
 
Our work tree already has the new version checked out in <code>Testing/Data</code> so we just need to tell Git to include this change in the next commit.
 
 
 
$ git add -- Testing/Data
 
 
 
The commit may also include the files edited above to use the new data:
 
 
 
$ git add -- ''files''
 
$ git commit
 
 
 
Now publish the ITK commits as you would any other topic.
 
 
 
=Testing=
 
 
 
==Dashboard==
 
 
 
The [[#Branches| dashboard]] branch contains a dashboard client helper script.
 
Use these commands to track it:
 
 
 
$ mkdir -p ~/Dashboards/ITKScripts
 
$ cd ~/Dashboards/ITKScripts
 
$ git init
 
$ git remote add -t dashboard origin git://itk.org/ITK.git
 
$ git pull origin
 
 
 
The <code>itk_common.cmake</code> script contains setup instructions in its top comments.
 
Update the '''dashboard''' branch to get the latest version of this script by simply running
 
 
 
$ git pull origin
 
 
 
=Troubleshooting=
 
 
 
==Firewall Blocks Port 9418==
 
 
 
Some institutions have firewalls that block Git's native protocol port 9418.
 
Use the "<code>url.<base>.insteadOf</code>" configuration option to map git URLs to http:
 
 
 
<pre>
 
$ git config --global url.http://itk.org/.insteadOf git://itk.org/
 
</pre>
 
 
 
This tells Git to translate URLs under the hood by replacing prefixes.
 
After running these commands ''once'' in your home directory then you can just use the "<code>git://</code>" mentioned elsewhere on this page and git will use the http protocol automagically.
 
 
 
==Git Below 1.6.5==
 
 
 
To clone ITK using Git 1.6.4 or lower, use the commands
 
 
 
$ git clone git://itk.org/ITK.git
 
$ cd ITK
 
$ git submodule init
 
$ git submodule update
 
 
 
== The remote end hung up unexpectedly ==
 
 
 
If <code>git push</code> fails with
 
 
 
fatal: The remote end hung up unexpectedly
 
 
 
check that you set the pushurl with "<code>git config</code>".
 
See the [[#Pushing|push instructions]].
 
 
 
If you suspect your ssh key may not be configured correctly, see the [[Git/Publish#Authentication_Test|authentication test]] instructions.
 
 
 
=Tips=
 
 
 
==Tip: Renaming==
 
 
 
Git does not explicitly track renames.  The command
 
 
 
$ git mv old new
 
 
 
is equivalent to
 
 
 
$ mv old new
 
$ git add new
 
$ git rm old
 
 
 
Neither approach records the rename outright.
 
However, Git's philosophy is "''dumb add, smart view''".
 
It uses heuristics to ''detect'' renames when viewing history after-the-fact.
 
It even works when the content of a renamed file changes slightly.
 
 
 
In order to help Git efficiently detect the rename, it is important to remove the old file and add the new one in ''one commit'', perhaps by using <code>git mv</code> or the above 3-step procedure.
 
If the new file were added in one commit and the old file removed in the next, Git would report this as a copy followed by a removal.
 
It's copy-detection heuristics are more computationally intensive and must be explicitly enabled with the <code>-C</code> option to relevant operations (such as <code>git blame</code>).
 
 
 
=Resources=
 
 
 
Additional information about Git may be obtained at sites listed [[Git/Resources|here]].
 

Latest revision as of 09:51, 6 October 2017

Introduction

ITK version tracking and development is hosted by Git. Please select a task for further instructions:

Main Tasks:

  • Install Git - Git 1.6.6 or greater is preferred (required for development)

Other Tasks:

The remainder of this page provides reference information and links. It is not intended to provide instructions.

Repositories

One may browse the repositories online using the Gitweb interface at http://itk.org/gitweb.

Repository Purpose Access URL
ITK.git Insight Toolkit clone (git) git://itk.org/ITK.git
clone (http) http://itk.org/ITK.git
push (ssh) git@itk.org:ITK.git
stage/ITK.git ITK Topic Stage clone (git) git://itk.org/stage/ITK.git
clone (http) http://itk.org/stage/ITK.git
push (ssh) git@itk.org:stage/ITK.git
ITKApps.git Insight Applications clone (git) git://itk.org/ITKApps.git
clone (http) http://itk.org/ITKApps.git
push (ssh) git@itk.org:ITKApps.git
ITKData.git ITK Testing/Data Submodule clone (git) git://itk.org/ITKData.git
clone (http) http://itk.org/ITKData.git
push (ssh) git@itk.org:ITKData.git

Branches

At the time of this writing the ITK.git repository has the following branches:

  • master: Development (default)
  • release: Maintenance of latest release
  • release-3.20: Maintenance of the ITKv3 series
  • nightly-master: Follows master, updated at 01:00 UTC
  • hooks: Local commit hooks (place in .git/hooks)
  • dashboard: Dashboard script (setup a CDash client)

Release branches converted from CVS have been artificially merged into master. Actual releases have tags named by the release version number.