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codeowners-checker

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Check .github/CODEOWNERS consistency

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# Codeowners Checker

This gem checks if the GitHub codeowners are specified to all files changes
between two git revisions.

## Installation

$ gem install codeowners-checker

## Usage

### Configure

$  codeowners-checker config owner <@owner>

It will configure `@owner` as the default owner in the config file.

#### Whitelist

If you are just starting to use `codeowners-checker` in your project, you might not have clear ownership defined for all parts of the code. In this case using the checker would be very tedious in the beginning, as it prompts for ownership rules for all files.

You can still use `codeowners-checker` in this case without the tedium by providing a whitelist. The whitelist contains patterns to ignore when checking files.

Just place a file called `CODEOWNERS_WHITELIST` next to your `CODEOWNERS` file to enable the whitelist.

Here is an example:

```
# The format of the file follows the format used by .gitignore

# ignore files under bin
bin/* 
```
For all operations, `codeowners-checker` will ignore files matching the patterns in here.

### Fetching and validating owners

By default, [check](#check-file-consistency) command will validate owners either against the prepopulated file (OWNERS)
or against data fetched from github.
Format of OWNERS is one owner per line.

Example OWNERS:
```
@company/backend-devs
@company/frontend-devs
@john.smith
```
GitHub credentials are taken from the following environment variables. You might want to put them into your .bashrc or equivalent:

$ export GITHUB_TOKEN='your GitHub PAT' # your personal access token from GitHub

The Github organization used to retrieve the groups/teams is automatically set according to the git remote URL. You can check and change this value using:

$ codeowners-checker config list
    $ codeowners-checker config organization <organization>

You can generate your PAT in [Settings -> Developer settings -> Personal access tokens on GitHub](https://github.com/settings/tokens) and `read:org` scope is **required**.

If you don't want to fetch the list from GitHub every-time you run codeowners-checker, you can fetch it and store in your repository
alongside of CODEOWNERS. The following prompt will also ask for your GitHub PAT/organization in case it is not already in environment:

$  codeowners-checker fetch

You can also turn off the validation using the following

$  codeowners-checker check --no-validateowners

### Check file consistency

To check if your CODEOWNERS file is consistent with your current project you can run
this check.

$  codeowners-checker check

Or via code:

```ruby
Codeowners::Checker.check! 'repo-dir', 'HEAD', 'branch-name'
```

#### Example

Example CODEOWNERS file:

```
# Backend
app/jobs/* @company/backend-devs
app/models/* @company/backend-devs

# Frontend
app/assets/* @company/frontend-devs
app/views/* @company/frontend-devs

# Shared
Gemfile @company
```

The content of the CODEOWNERS file is parsed into groups where each group is a collection of patterns
separated by an empty line and comments describing the group. If no comment is present after
an empty line, a new group is created only in the case when the owner differs from the owner
of the previous group. It is also possible to define a group by comments `# BEGIN` and `# END`.
`# Group` can contain subgroups distinguished by the number of hashes: `## Subgroup`.

When a new file is added to the folder structure, the program detects the file and suggests possible
groups to which particular file belongs based on the main owner of the patterns in each group.
After selecting a group the pattern is added to the group in alphabetical order. If no group is
selected or found the pattern can be added at the end of the CODEOWNERS file.

After modifying the CODEOWNERS file the changes can be immediately committed.

![Missing reference example](https://raw.githubusercontent.com/toptal/codeowners-checker/master/demos/missing_reference.svg)

Desired changes were made to the CODEOWNERS file:
```
# Backend
app/controllers/application_controller.rb @company/backend-devs
app/jobs/* @company/backend-devs
app/models/* @company/backend-devs

# Frontend
app/assets/* @company/frontend-devs
app/views/* @company/frontend-devs

# Shared
Gemfile @company

lib/invoices.rb @company/billing-team
```

Now some new patterns containing mistakes have been added by the user to the group `# Shared` and `# Billing`
and invalid pattern to a new group which is defined by `# BEGIN Security` and `# END Security` comments.

CODEOWNERS file after performing the changes described above:
```
# Backend
app/controllers/application_controller.rb @company/backend-devs
app/jobs/* @company/backend-devs
app/models/* @company/backend-devs

# Frontend
app/assets/* @company/frontend-devs
app/views/* @company/frontend-devs

# Billing
app/models/billng.rb @company/billing-team
lib/invoices.rb @company/billing-team

# BEGIN Security
lib/security/* @company/security-team
# END Security

# Shared
.rubo.yml @company
Gemfile @company

```

When running it again it will detect the invalid patterns. It will ask to fix the patterns
and suggest a possible alternative. The user can choose to accept the suggestion, ignore, edit
or delete the pattern. If the user decides to delete the last pattern in a group,
the comments defining the group are deleted as well as the pattern.

![Useless pattern example](https://raw.githubusercontent.com/toptal/codeowners-checker/master/demos/useless_pattern.svg)

You can also use [fzf](https://github.com/junegunn/fzf) to pick better results
and interactively choose the right file.

Invalid patterns were fixed and the group `Security` was removed when deleting the only pattern
in the group:
```
# Backend
app/controllers/application_controller.rb @company/backend-devs
app/jobs/* @company/backend-devs
app/models/* @company/backend-devs

# Frontend
app/assets/* @company/frontend-devs
app/views/* @company/frontend-devs

# Billing
app/models/billing.rb @company/billing-team
lib/invoices.rb @company/billing-team

# Shared
.rubocop.yml @company
Gemfile @company
```

### Filtering Changes in Pull Requests

If you have a Pull Request to review and you just want to check the changes that
are meaningful to you, you can also filter the changes.

To list all the changes grouped by an owner:

$  codeowners-checker filter all

It will use the default owner from the configuration if you omit parameters:

$  codeowners-checker filter

Or you can filter any owner as a parameter:

$  codeowners-checker filter by <owner>

## Development

After checking out the repo, run `bin/setup` to install dependencies. Then, run `bundle exec rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).

Have a look at [spec/README.md](./spec/README.md) for more information about what tools are available when writing tests.

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/toptal/codeowners-checker. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.

## License

The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).

## Code of Conduct

Everyone interacting in the Codeowners::Checker project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/toptal/codeowners-checker/blob/master/CODE_OF_CONDUCT.md).

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