= Contributing

The `Substrate` project is an **OPENISH Open Source Project**

== What?

Individuals making significant and valuable contributions are given commit-access to a project to contribute as they see fit. A project is more like an open wiki than a standard guarded open source project.

== Rules

There are a few basic ground-rules for contributors (including the maintainer(s) of the project):

. **No `--force` pushes** or modifying the Git history in any way. If you need to rebase, ensure you do it in your own repo.
. **Non-master branches**, prefixed with a short name moniker (e.g. `gav-my-feature`) must be used for ongoing work.
. **All modifications** must be made in a **pull-request** to solicit feedback from other contributors.
. A pull-request *must not be merged until CI* has finished successfully.
. Contributors should adhere to the https://github.com/paritytech/polkadot/wiki/Style-Guide[house coding style].

Merging pull requests once CI is successful:

. A pull request that does not alter any logic (e.g. comments, dependencies, docs) may be tagged https://github.com/paritytech/core/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Aopen+label%3AA2-insubstantial[`insubstantial`] and merged by its author.
. A pull request with no large change to logic that is an urgent fix may be merged after a non-author contributor has reviewed it well.
. All other PRs should sit for 48 hours with the https://github.com/paritytech/core/pulls?q=is%3Apr+is%3Aopen+label%3AA0-pleasereview[`pleasereview`] tag in order to garner feedback.
. No PR should be merged until all reviews' comments are addressed.

.Reviewing pull requests:
When reviewing a pull request, the end-goal is to suggest useful changes to the author. Reviews should finish with approval unless there are issues that would result in:

. Buggy behaviour.
. Undue maintenance burden.
. Breaking with house coding style.
. Pessimisation (i.e. reduction of speed as measured in the projects benchmarks).
. Feature reduction (i.e. it removes some aspect of functionality that a significant minority of users rely on).
. Uselessness (i.e. it does not strictly add a feature or fix a known issue).

.Reviews may not be used as an effective veto for a PR because:
. There exists a somewhat cleaner/better/faster way of accomplishing the same feature/fix.
. It does not fit well with some other contributors' longer-term vision for the project.

== Releases

Declaring formal releases remains the prerogative of the project maintainer(s).

== Changes to this arrangement

This is an experiment and feedback is welcome! This document may also be subject to pull-requests or changes by contributors where you believe you have something valuable to add or change.

== Heritage

These contributing guidelines are modified from the "OPEN Open Source Project" guidelines for the Level project: https://github.com/Level/community/blob/master/CONTRIBUTING.md
