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Contributing code to Matrix
===========================
Everyone is welcome to contribute code to Matrix
(https://github.com/matrix-org), provided that they are willing to license
their contributions under the same license as the project itself. We follow a
simple 'inbound=outbound' model for contributions: the act of submitting an
'inbound' contribution means that the contributor agrees to license the code
under the same terms as the project's overall 'outbound' license - in our
case, this is almost always Apache Software License v2 (see LICENSE).
How to contribute
~~~~~~~~~~~~~~~~~
The preferred and easiest way to contribute changes to Matrix is to fork the
relevant project on github, and then create a pull request to ask us to pull
your changes into our repo
(https://help.github.com/articles/using-pull-requests/)
**The single biggest thing you need to know is: please base your changes on
the develop branch - /not/ master.**
We use the master branch to track the most recent release, so that folks who
blindly clone the repo and automatically check out master get something that
works. Develop is the unstable branch where all the development actually
happens: the workflow is that contributors should fork the develop branch to
make a 'feature' branch for a particular contribution, and then make a pull
request to merge this back into the matrix.org 'official' develop branch. We
use github's pull request workflow to review the contribution, and either ask
you to make any refinements needed or merge it and make them ourselves. The
changes will then land on master when we next do a release.
We use `Jenkins <http://matrix.org/jenkins>`_ and
`Travis <https://travis-ci.org/matrix-org/synapse>`_ for continuous
integration. All pull requests to synapse get automatically tested by Travis;
the Jenkins builds require an adminstrator to start them. If your change
breaks the build, this will be shown in github, so please keep an eye on the
pull request for feedback.
Code style
~~~~~~~~~~
All Matrix projects have a well-defined code-style - and sometimes we've even
got as far as documenting it... For instance, synapse's code style doc lives
at https://github.com/matrix-org/synapse/tree/master/docs/code_style.rst.
Please ensure your changes match the cosmetic style of the existing project,
and **never** mix cosmetic and functional changes in the same commit, as it
makes it horribly hard to review otherwise.
Changelog
~~~~~~~~~
All changes, even minor ones, need a corresponding changelog / newsfragment
entry. These are managed by Towncrier
(https://github.com/hawkowl/towncrier).
To create a changelog entry, make a new file in the ``changelog.d``
file named in the format of ``issuenumberOrPR.type``. The type can be
one of ``feature``, ``bugfix``, ``removal`` (also used for
deprecations), or ``misc`` (for internal-only changes). The content of
the file is your changelog entry, which can contain RestructuredText
formatting. A note of contributors is welcomed in changelogs for
non-misc changes (the content of misc changes is not displayed).
For example, a fix for a bug reported in #1234 would have its
changelog entry in ``changelog.d/1234.bugfix``, and contain content
like "The security levels of Florbs are now validated when
recieved over federation. Contributed by Jane Matrix".
Attribution
~~~~~~~~~~~
Everyone who contributes anything to Matrix is welcome to be listed in the
AUTHORS.rst file for the project in question. Please feel free to include a
change to AUTHORS.rst in your pull request to list yourself and a short
description of the area(s) you've worked on. Also, we sometimes have swag to
give away to contributors - if you feel that Matrix-branded apparel is missing
from your life, please mail us your shipping address to matrix at matrix.org and we'll try to fix it :)
Sign off
~~~~~~~~
In order to have a concrete record that your contribution is intentional
and you agree to license it under the same terms as the project's license, we've adopted the
same lightweight approach that the Linux Kernel
(https://www.kernel.org/doc/Documentation/SubmittingPatches), Docker
(https://github.com/docker/docker/blob/master/CONTRIBUTING.md), and many other
projects use: the DCO (Developer Certificate of Origin:
http://developercertificate.org/). This is a simple declaration that you wrote
the contribution or otherwise have the right to contribute it to Matrix::
Developer Certificate of Origin
Version 1.1
Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
660 York Street, Suite 102,
San Francisco, CA 94110 USA
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
Developer's Certificate of Origin 1.1
By making a contribution to this project, I certify that:
(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file; or
(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or
(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.
(d) I understand and agree that this project and the contribution
are public and that a record of the contribution (including all
personal information I submit with it, including my sign-off) is
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.
If you agree to this for your contribution, then all that's needed is to
include the line in your commit or pull request comment::
Signed-off-by: Your Name <your@email.example.org>
We accept contributions under a legally identifiable name, such as
your name on government documentation or common-law names (names
claimed by legitimate usage or repute). Unfortunately, we cannot
accept anonymous contributions at this time.
Git allows you to add this signoff automatically when using the ``-s``
flag to ``git commit``, which uses the name and email set in your
``user.name`` and ``user.email`` git configs.
Conclusion
~~~~~~~~~~
That's it! Matrix is a very open and collaborative project as you might expect given our obsession with open communication. If we're going to successfully matrix together all the fragmented communication technologies out there we are reliant on contributions and collaboration from the community to do so. So please get involved - and we hope you have as much fun hacking on Matrix as we do!