docs: add instructions and details to contributors guide (#105)

This commit adds instructions and details to contributors guide and provides detailed guidance for pull requests and maintainers in separate documents.

Signed-off-by: Lance Ball <lball@redhat.com>
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:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
Following you will see some guidelines about how to contribute with
JavaScript SDK.
## Branch Management
We use Gitflow to manage our branches and that's ok when `develop` branch is
ahead of `master`.
- [Gitflow](https://nvie.com/posts/a-successful-git-branching-model/) by @nvie
## Changelog
The [CHANGELOG.md](./CHANGELOG.md) will be updated with your commits if you format
your commit messages following the
[Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/#summary).
If you are unsure what prefix to use for a commit, you can consult the
[package.json](https://github.com/cloudevents/sdk-javascript/blob/master/package.json) file
in this repository. In the `standard-version.types` section, you can see all of the commit
types that will be committed to the changelog based on the prefix in the first line of
your commit message. For example, the commit message:
```log
fix: removed a bug that was causing the rotation of the earth to change
```
will show up in the "Bug Fixes" section of the changelog for a given release.
We welcome contributions from the community! Please take some time to become
acquainted with the process before submitting a pull request. There are just
a few things to keep in mind.
## Pull Requests
Guidelines about how to perform pull requests.
Typically a pull request should relate to an existing issue. If you have
found a bug, want to add an improvement, or suggest an API change, please
create an issue before proceeding with a pull request. For very minor changes
such as typos in the documentation this isn't really necessary.
- before submit the PR, open an issue and link them
For step by step help with managing your pull request, have a look at our
[PR Guidelines](pr_guidelines.md) document.
### Commit Messages
Please follow the Conventional Commits specification noted above. the first line of
your commit should be prefixed with a type, be a single sentence with no period, and
succinctly indicate what this commit changes.
Please follow the
[Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/#summary).
All commit message lines should be kept to fewer than 80 characters if possible.
### Sign your work
### PR to `develop`
Each PR must be signed. Be sure your `git` `user.name` and `user.email` are configured
then use the `--signoff` flag for your commits.
- fixes in the documentation (readme, contributors)
- propose new files for the documentation
- implementation of new features
```console
git commit --signoff
```
### PR to `master`
### Style Guide
- hot fixes
Code style for this module is maintained using [`eslint`](https://www.npmjs.com/package/eslint).
When you run tests with `npm test` linting is performed first. If you want to
check your code style for linting errors without running tests, you can just
run `npm run lint`. If there are errors, you can usually fix them automatically
by running `npm run fix`.
## Style Guide
_TODO_
### JavaScript Style Guide
_TODO_
Linting rules are declared in [.eslintrc](https://github.com/cloudevents/sdk-javascript/blob/master/.eslintrc).

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# Maintainer's Guide
## Tips
Here are a few tips for repository maintainers.
* Stay on top of your pull requests. PRs that languish for too long can become difficult to merge.
* Work from your own fork. As you are making contributions to the project, you should be working from your own fork just as outside contributors do. This keeps the branches in github to a minimum and reduces unnecessary CI runs.
* Try to proactively label issues with backport labels if it's obvious that a change should be backported to previous releases.
* When landing pull requests, if there is more than one commit, try to squash into a single commit. Usually this can just be done with the GitHub UI when merging the PR. Use "Squash and merge".
* Triage issues once in a while in order to keep the repository alive. During the triage:
* If some issues are stale for too long because they are no longer valid/relevant or because the discussion reached no significant action items to perform, close them and invite the users to reopen if they need it.
* If some PRs are no longer valid but still needed, ask the user to rebase them
* If some issues and PRs are still relevant, use labels to help organize tasks
* If you find an issue that you want to create a fix for and submit a pull request, be sure to assign it to yourself so that others maintainers don't start working on it at the same time.
## Branch Management
The `master` branch is is the bleeding edge. New major versions of the module
are cut from this branch and tagged. If you intend to submit a pull request
you should use `master HEAD` as your starting point.
Each major release will result in a new branch and tag. For example, the
release of version 1.0.0 of the module will result in a `v1.0.0` tag on the
release commit, and a new branch `v1.x.y` for subsequent minor and patch
level releases of that major version. However, development will continue
apace on `master` for the next major version - e.g. 2.0.0. Version branches
are only created for each major version. Minor and patch level releases
are simply tagged.

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# Pull Request Guidelines
Here you will find step by step guidance for creating, submitting and updating
a pull request in this repository. We hope it will help you have an easy time
managing your work and a positive, satisfying experience when contributing
your code. Thanks for getting involved! :rocket:
* [Getting Started](#getting-started)
* [Branches](#branches)
* [Commit Messages](#commit-messages)
* [Staying current with master](#staying-current-with-master)
* [Style Guide](#style-guide)
* [Submitting and Updating a Pull Request](#submitting-and-updating-a-pull-request)
* [Congratulations!](#congratulations)
## Getting Started
When creating a pull request, first fork this repository and clone it to your
local development environment. Then add this repository as the upstream.
```console
git clone https://github.com/mygithuborg/sdk-javascript.git
cd sdk-javascript
git remote add upstream https://github.com/cloudevents/sdk-javascript.git
```
## Branches
The first thing you'll need to do is create a branch for your work.
If you are submitting a pull request that fixes or relates to an existing
GitHub issue, you can use this in your branch name to keep things organized.
For example, if you were to create a pull request to fix
[this error with `httpAgent`](https://github.com/cloudevents/sdk-javascript/issues/48)
you might create a branch named `48-fix-http-agent-error`.
```console
git fetch upstream
git reset --hard upstream/master
git checkout -b 48-fix-http-agent-error
```
## Commit Messages
Please follow the
[Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/#summary).
The first line of your commit should be prefixed with a type, be a single
sentence with no period, and succinctly indicate what this commit changes.
All commit message lines should be kept to fewer than 80 characters if possible.
An example of a good commit message.
```log
docs: remove 0.1, 0.2 spec support from README
```
If you are unsure what prefix to use for a commit, you can consult the
[package.json](package.json) file.
In the `standard-version.types` section, you can see all of the commit
types that will be committed to the changelog based on the prefix in the first line of
your commit message. For example, the commit message:
```log
fix: removed a bug that was causing the rotation of the earth to change
```
will show up in the "Bug Fixes" section of the changelog for a given release.
### Signing your commits
Each commit must be signed. Use the `--signoff` flag for your commits.
```console
git commit --signoff
```
This will 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.)
The sign-off is a signature line at the end of your commit message. Your
signature certifies that you wrote the patch or otherwise have the right to pass
it on as open-source code. See [developercertificate.org](http://developercertificate.org/))
for the full text of the certification.
Be sure to have your `user.name` and `user.email` set in your git config.
If your git config information is set properly then viewing the `git log`
information for your commit will look something like this:
```
Author: Joe Smith <joe.smith@email.com>
Date: Thu Feb 2 11:41:15 2018 -0800
Update README
Signed-off-by: Joe Smith <joe.smith@email.com>
```
Notice the `Author` and `Signed-off-by` lines match. If they don't your PR will
be rejected by the automated DCO check.
## Staying Current with `master`
As you are working on your branch, changes may happen on `master`. Before
submitting your pull request, be sure that your branch has been updated
with the latest commits.
```console
git fetch upstream
git rebase upstream/master
```
This may cause conflicts if the files you are changing on your branch are
also changed on master. Error messages from `git` will indicate if conflicts
exist and what files need attention. Resolve the conflicts in each file, then
continue with the rebase with `git rebase --continue`.
If you've already pushed some changes to your `origin` fork, you'll
need to force push these changes.
```console
git push -f origin 48-fix-http-agent-error
```
## Style Guide
Code style for this module is maintained using [`eslint`](https://www.npmjs.com/package/eslint).
When you run tests with `npm test` linting is performed first. If you want to
check your code style for linting errors without running tests, you can just
run `npm run lint`. If there are errors, you can usually fix them automatically
by running `npm run fix`.
Linting rules are declared in [.eslintrc](https://github.com/cloudevents/sdk-javascript/blob/master/.eslintrc).
## Submitting and Updating Your Pull Request
Before submitting a pull request, you should make sure that all of the tests
successfully pass by running `npm test`.
Once you have sent your pull request, `master` may continue to evolve
before your pull request has landed. If there are any commits on `master`
that conflict with your changes, you may need to update your branch with
these changes before the pull request can land. Resolve conflicts the same
way as before.
```console
git fetch upstream
git rebase upstream/master
# fix any potential conflicts
git push -f origin 48-fix-http-agent-error
```
This will cause the pull request to be updated with your changes, and
CI will rerun.
A maintainer may ask you to make changes to your pull request. Sometimes these
changes are minor and shouldn't appear in the commit log. For example, you may
have a typo in one of your code comments that should be fixed before merge.
You can prevent this from adding noise to the commit log with an interactive
rebase. See the [git documentation](https://git-scm.com/book/en/v2/Git-Tools-Rewriting-History)
for details.
```console
git commit -m "fixup: fix typo"
git rebase -i upstream/master # follow git instructions
```
Once you have rebased your commits, you can force push to your fork as before.
## Congratulations!
Congratulations! You've done it! We really appreciate the time and energy
you've given to the project. Thank you.