280 lines
12 KiB
Markdown
280 lines
12 KiB
Markdown
# Contributing code to Synapse
|
|
|
|
Everyone is welcome to contribute code to [matrix.org
|
|
projects](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](LICENSE)).
|
|
|
|
## How to contribute
|
|
|
|
The preferred and easiest way to contribute changes is to fork the relevant
|
|
project on github, and then [create a pull request](
|
|
https://help.github.com/articles/using-pull-requests/) to ask us to pull your
|
|
changes into our repo.
|
|
|
|
**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.
|
|
|
|
Some other things you will need to know when contributing to Synapse:
|
|
|
|
* Please follow the [code style requirements](#code-style).
|
|
|
|
* Please include a [changelog entry](#changelog) with each PR.
|
|
|
|
* Please [sign off](#sign-off) your contribution.
|
|
|
|
* Please keep an eye on the pull request for feedback from the [continuous
|
|
integration system](#continuous-integration-and-testing) and try to fix any
|
|
errors that come up.
|
|
|
|
* If you need to [update your PR](#updating-your-pull-request), just add new
|
|
commits to your branch rather than rebasing.
|
|
|
|
## Code style
|
|
|
|
Synapse's code style is documented [here](docs/code_style.md). Please follow
|
|
it, including the conventions for the [sample configuration
|
|
file](docs/code_style.md#configuration-file-format).
|
|
|
|
Many of the conventions are enforced by scripts which are run as part of the
|
|
[continuous integration system](#continuous-integration-and-testing). To help
|
|
check if you have followed the code style, you can run `scripts-dev/lint.sh`
|
|
locally. You'll need python 3.6 or later, and to install a number of tools:
|
|
|
|
```
|
|
# Install the dependencies
|
|
pip install -U black flake8 flake8-comprehensions isort
|
|
|
|
# Run the linter script
|
|
./scripts-dev/lint.sh
|
|
```
|
|
|
|
**Note that the script does not just test/check, but also reformats code, so you
|
|
may wish to ensure any new code is committed first**.
|
|
|
|
By default, this script checks all files and can take some time; if you alter
|
|
only certain files, you might wish to specify paths as arguments to reduce the
|
|
run-time:
|
|
|
|
```
|
|
./scripts-dev/lint.sh path/to/file1.py path/to/file2.py path/to/folder
|
|
```
|
|
|
|
Before pushing new changes, ensure they don't produce linting errors. Commit any
|
|
files that were corrected.
|
|
|
|
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` directory named
|
|
in the format of `PRnumber.type`. The type can be one of the following:
|
|
|
|
* `feature`
|
|
* `bugfix`
|
|
* `docker` (for updates to the Docker image)
|
|
* `doc` (for updates to the documentation)
|
|
* `removal` (also used for deprecations)
|
|
* `misc` (for internal-only changes)
|
|
|
|
This file will become part of our [changelog](
|
|
https://github.com/matrix-org/synapse/blob/master/CHANGES.md) at the next
|
|
release, so the content of the file should be a short description of your
|
|
change in the same style as the rest of the changelog. The file can contain Markdown
|
|
formatting, and should end with a full stop (.) or an exclamation mark (!) for
|
|
consistency.
|
|
|
|
Adding credits to the changelog is encouraged, we value your
|
|
contributions and would like to have you shouted out in the release notes!
|
|
|
|
For example, a fix in PR #1234 would have its changelog entry in
|
|
`changelog.d/1234.bugfix`, and contain content like:
|
|
|
|
> The security levels of Florbs are now validated when received
|
|
> via the `/federation/florb` endpoint. Contributed by Jane Matrix.
|
|
|
|
If there are multiple pull requests involved in a single bugfix/feature/etc,
|
|
then the content for each `changelog.d` file should be the same. Towncrier will
|
|
merge the matching files together into a single changelog entry when we come to
|
|
release.
|
|
|
|
### How do I know what to call the changelog file before I create the PR?
|
|
|
|
Obviously, you don't know if you should call your newsfile
|
|
`1234.bugfix` or `5678.bugfix` until you create the PR, which leads to a
|
|
chicken-and-egg problem.
|
|
|
|
There are two options for solving this:
|
|
|
|
1. Open the PR without a changelog file, see what number you got, and *then*
|
|
add the changelog file to your branch (see [Updating your pull
|
|
request](#updating-your-pull-request)), or:
|
|
|
|
1. Look at the [list of all
|
|
issues/PRs](https://github.com/matrix-org/synapse/issues?q=), add one to the
|
|
highest number you see, and quickly open the PR before somebody else claims
|
|
your number.
|
|
|
|
[This
|
|
script](https://github.com/richvdh/scripts/blob/master/next_github_number.sh)
|
|
might be helpful if you find yourself doing this a lot.
|
|
|
|
Sorry, we know it's a bit fiddly, but it's *really* helpful for us when we come
|
|
to put together a release!
|
|
|
|
### Debian changelog
|
|
|
|
Changes which affect the debian packaging files (in `debian`) are an
|
|
exception to the rule that all changes require a `changelog.d` file.
|
|
|
|
In this case, you will need to add an entry to the debian changelog for the
|
|
next release. For this, run the following command:
|
|
|
|
```
|
|
dch
|
|
```
|
|
|
|
This will make up a new version number (if there isn't already an unreleased
|
|
version in flight), and open an editor where you can add a new changelog entry.
|
|
(Our release process will ensure that the version number and maintainer name is
|
|
corrected for the release.)
|
|
|
|
If your change affects both the debian packaging *and* files outside the debian
|
|
directory, you will need both a regular newsfragment *and* an entry in the
|
|
debian changelog. (Though typically such changes should be submitted as two
|
|
separate pull requests.)
|
|
|
|
## 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
|
|
[submitting patches process](
|
|
https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin>),
|
|
[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.
|
|
|
|
## Continuous integration and testing
|
|
|
|
[Buildkite](https://buildkite.com/matrix-dot-org/synapse) will automatically
|
|
run a series of checks and tests against any PR which is opened against the
|
|
project; if your change breaks the build, this will be shown in GitHub, with
|
|
links to the build results. If your build fails, please try to fix the errors
|
|
and update your branch.
|
|
|
|
To run unit tests in a local development environment, you can use:
|
|
|
|
- ``tox -e py35`` (requires tox to be installed by ``pip install tox``)
|
|
for SQLite-backed Synapse on Python 3.5.
|
|
- ``tox -e py36`` for SQLite-backed Synapse on Python 3.6.
|
|
- ``tox -e py36-postgres`` for PostgreSQL-backed Synapse on Python 3.6
|
|
(requires a running local PostgreSQL with access to create databases).
|
|
- ``./test_postgresql.sh`` for PostgreSQL-backed Synapse on Python 3.5
|
|
(requires Docker). Entirely self-contained, recommended if you don't want to
|
|
set up PostgreSQL yourself.
|
|
|
|
Docker images are available for running the integration tests (SyTest) locally,
|
|
see the [documentation in the SyTest repo](
|
|
https://github.com/matrix-org/sytest/blob/develop/docker/README.md) for more
|
|
information.
|
|
|
|
## Updating your pull request
|
|
|
|
If you decide to make changes to your pull request - perhaps to address issues
|
|
raised in a review, or to fix problems highlighted by [continuous
|
|
integration](#continuous-integration-and-testing) - just add new commits to your
|
|
branch, and push to GitHub. The pull request will automatically be updated.
|
|
|
|
Please **avoid** rebasing your branch, especially once the PR has been
|
|
reviewed: doing so makes it very difficult for a reviewer to see what has
|
|
changed since a previous review.
|
|
|
|
## Notes for maintainers on merging PRs etc
|
|
|
|
There are some notes for those with commit access to the project on how we
|
|
manage git [here](docs/dev/git.md).
|
|
|
|
## 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!
|