Contributions should be made via pull requests. Pull requests will be reviewed by one or more maintainers and merged when acceptable.
The goal of the Compose Reference Implementation is to be a complete and simple implementation of the Compose Specification that targets the Docker API. Contributors using this code code should be able to:
- use it as a test harness to experiment with Compose specification changes
- understand the main concepts of the specification
- see a concrete example of how to develop her/his own implementation
We ask that contributors read the Compose Specification and Compose Vision to ensure that proposed changes are aligned with the objectives of the Compose project.
To help maintainers understand what user or developer problem needs to be solved, the first step to a contribution is usually submitting an issue. A well written issue is one that clearly outlines the developer or user problem that needs to be solved along with a list of requirements for resolution of the problem. If there are multiple possible solutions to the problem, these can be outlined in the issue. Once consensus is reached on how to resolve the issue, a pull request can be created.
Pull requests that propose minor changes or improvements may be submitted without an associated issue or discussion.
For large or high impact changes, contributors can reach out to maintainers before starting work. This will ensure that contributors and maintainers are aligned and increase the chance that the change is accepted.
Commit messages should follow best practices and explain the context of the problem and how it was solved-- including any caveats or follow up changes required. They should tell the story of the change and provide readers an understanding of what led to it.
How to Write a Git Commit Message provides a good guide for how to do so.
In practice, the best approach to maintaining a nice commit message is to
leverage a git add -p and git commit --amend to formulate a solid
change set. This allows one to piece together a change, as information becomes
available.
If you squash a series of commits, don't just submit that. Re-write the commit message, as if the series of commits was a single stroke of brilliance.
That said, there is no requirement to have a single commit for a pull request, as long as each commit tells the story. For example, if there is a feature that requires a package, it might make sense to have the package in a separate commit then have a subsequent commit that uses it.
Remember, you're telling part of the story with the commit message. Don't make your chapter weird.
The sign-off is a simple line at the end of the explanation for the patch. Your signature certifies that you wrote the patch or otherwise have the right to pass it on as an open-source patch. The rules are pretty simple: if you can certify the below (from developercertificate.org):
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.
Then you just add a line to every git commit message:
Signed-off-by: Joe Smith <joe.smith@email.com>
Use your real name (sorry, no pseudonyms or anonymous contributions.)
If you set your user.name and user.email git configs, you can sign your
commit automatically with git commit -s.