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Line 1: − + + − + − + − For example to clone CRIU one need to type+ − git clone [https://github.com/xemul/criu https://github.com/xemul/criu]+ − === Picking the proper branch ===+ + + + − In CRIU development happens on the ''criu-dev'' branch. From time to time patches from this branch are moved (cherry-picked) into the master branch, which is used for stable [[releases]].+ − === Compiling the source code ===+ + + − {{Note|Dependencies are listed in the [[Installation]] article.}} − Run: − + − As you are going to work with sources, it would come in handy to get tags by running:+ + + + + + − {{Note|It requires ctags to be installed.}} − == Changing the source code ==+ + + + + + + + + + + + + − When you change the source code keep in mind - we prefer tabs and+ − indentations to be 8 characters width. Consider reading [https://www.kernel.org/doc/Documentation/CodingStyle Linux kernel coding style]. − Other "rules" could be learned from the source code - just make your code+ − to look similar.+ + + − + − There are at least two ways to make it right.+ − 1) git format-patch+ − + − + − 2) Use "diff -up"+ − Use <code>diff -up</code> or <code>diff -uprN</code> to create patches.+ − + − == Signing your work == − − − on patches that are being emailed around. − + − Developer's Certificate of Origin 1.1+ − + + Line 83:
Line 101: − + Line 95:
Line 113: − + + + Line 106:
Line 126: + − + − Basic style error checking is provided by scripts/checkpatch.pl script − from linux kernel source tree. You might have headers or complete sources − of linux kernel at /usr/src/. Run − checkpatch.pl my_patch.patch (consider --no-tree option for headers-only) − It will produce detailed report on style problems in your patch. − Make sure to fix all _errors_(some warnings may be ignored). − − To check whether your patches don't harm anything run − make test − It will launch [[ZDTM_Test_Suite]]. Check for error messages produced by it. − You may also want to run other tests(rpc, libcriu, security etc) from test/ dir. − − In addition, you can enable [https://travis-ci.org/xemul/criu travis-ci] for you github repo, − which will check compilation on all platforms and execute a big part of tests. − − == Mailing patches == − + − − + − − + − + − But definitely the patches will not go to <code>/dev/null</code>.
simplified and restructured to make more comprehensible; fixes to English
== Setting up working enviroment ==
== Set up working environment ==
Although criu could be run as non-root (see [[Security]]), development is better to be done as root. For example, some tests require root. So, it would be a good idea to set up some recent Linux distro on a virtual machine.
Although criu could be run as non-root (see [[Security]]), development is better to be done as root. For example, some tests require root. So, it would be a good idea to set up some recent Linux distro on a virtual machine.
=== Obtaining the source code ===
== Get the source code ==
The CRIU sources are tracked by Git SCM at [https://github.com/xemul/criu https://github.com/xemul/criu] repository. You either could download packed sources or use git tool itself.
The CRIU sources are tracked by Git. Official CRIU repo is at [https://github.com/xemul/criu https://github.com/xemul/criu].
The repository may contain multiple branches. Development happens in the '''criu-dev''' branch.
To clone CRIU repo and switch to the proper branch, run:
<pre><nowiki>
git clone https://github.com/xemul/criu
git checkout criu-dev
</nowiki></pre>
== Compile ==
First, you need to install compile-time dependencies. Check [[Installation#Dependencies]] for more info.
To compile CRIU, run:
cd criu
cd criu
make
make
This will produce ./criu executable.
This should make the ./criu executable.
== Edit the source code ==
If you use ctags, you can generate the ctags file by running
make tags
make tags
When you change the source code, please keep in mind the following code conventions:
* we prefer tabs and indentations to be 8 characters width
* consider reading [https://www.kernel.org/doc/Documentation/CodingStyle Linux kernel coding style].
Other conventions can be learned from the source code itself. In short, make sure your new code
looks similar to what is already there.
== Test your changes ==
CRIU comes with an extensive test suite. To check whether your changes introduce any regressions, run
make test
The command runs [[ZDTM Test Suite]]. Check for any error messages produced by it.
In case you'd rather have someone else run the tests, you can use travis-ci for your
own github fork of CRIU. It will check the compilation for various supported platforms,
as well as run most of the tests from the suite. See https://travis-ci.org/xemul/criu
for more details.
== Producing a patch ==
== Make a patch ==
To create a patch, run
git format-patch
You might need to read documentation on Git SCM how to prepare patch
You might need to read GIT documentation on how to prepare patches
for mail submission. Take a look on http://book.git-scm.com/ and/or
for mail submission. Take a look at http://book.git-scm.com/ and/or
http://git-scm.com/documentation for details. It should not be hard
http://git-scm.com/documentation for details. It should not be hard
at all.
at all.
== Sign your work ==
To improve tracking of who did what, we ask you to sign off the patches
that are to be emailed.
To improve tracking of who did what we've introduced a "sign-off" procedure
The sign-off is a simple line at the end of the explanation for the
The sign-off is a simple line at the end of the explanation for the
patch, which certifies that you wrote it or otherwise have the right to
patch, which certifies that you wrote it or otherwise have the right to
pass it on as a open-source patch. The rules are pretty simple: if you
pass it on as an open-source patch. The rules are pretty simple: if you
can certify the below:
can certify the below:
<div class="toccolours mw-collapsible mw-collapsed" style="width: 64em;">
'''Developer's Certificate of Origin 1.1'''
<div class="mw-collapsible-content">
By making a contribution to this project, I certify that:
By making a contribution to this project, I certify that:
maintained indefinitely and may be redistributed consistent with
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.
this project or the open source license(s) involved.
</div></div>
then you just add a line saying
then you just add a line saying
<code>git commit --amend -s</code>.
<code>git commit --amend -s</code>.
== An example of patch message ==
<div class="toccolours mw-collapsible mw-collapsed" style="width: 64em;">
'''Example patch message'''
<div class="mw-collapsible-content">
From: Random J Developer <random at developer.example.org>
From: Random J Developer <random at developer.example.org>
---
---
Patch body here
Patch body here
</div></div>
== Checking patches for errors ==
== Mail patches ==
The patches should be sent to CRIU development mailing list
The patches should be sent to [CRIU development mailing list which is located at https://openvz.org/mailman/listinfo/criu].
which is located at https://openvz.org/mailman/listinfo/criu
Please make sure the email client you're using doesn't screw
Please make sure the email client you're using doesn't screw your patch (line wrapping and so on).
your patch (line wrapping and so on).
== Wait for response ==
== Wait for response ==
Be patient. Most CRIU developers are pretty busy people so if
Be patient. Most CRIU developers are pretty busy people so if
there is no immediate response on your patch - don't be surprised,
there is no immediate response on your patch — don't be surprised,
sometimes a patch may fly around a week(s) before it get reviewed.
sometimes a patch may fly around a week before it gets reviewed.
[[Category:Development]]
[[Category:Development]]