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Danger

What does danger checks

PR check

See the dangerfile. If you add rules in the dangerfile, please update the list below!

Here are the checks that Danger does so far:

  • PR description is not empty
  • Big PR got a warning to recommend to split
  • PR contains a file for towncrier and extension is checked
  • PR does not modify frozen classes
  • PR contains a Sign-Off, with exception for Element employee contributors
  • PR with change on layout should include screenshot in the description (TODO Not supported yet!)
  • PR which adds png file warn about the usage of vector drawables
  • non draft PR should have a reviewer
  • files containing translations are not modified by developers

Quality check

After all the checks that generate checkstyle XML report, such as Ktlint, lint, or Detekt, Danger is run with this dangerfile, in order to post comments to the PR with the detected error and warnings.

To run locally, you will have to install the plugin danger-plugin-lint-report using:

yarn add danger-plugin-lint-report --dev

Setup

This operation should not be necessary, since Danger is already setup for the project.

To setup danger to the project, run:

bundle exec danger init

Run danger locally

When modifying the dangerfile, you can check it by running Danger locally.

To run danger locally, install it and run:

bundle exec danger pr <PR_URL> --dangerfile=./tools/danger/dangerfile.js

For instance:

bundle exec danger pr https://github.com/element-hq/element-android/pull/6637 --dangerfile=./tools/danger/dangerfile.js

We may need to create a GitHub token to have less API rate limiting, and then set the env var:

export DANGER_GITHUB_API_TOKEN='YOUR_TOKEN'

Swift and Kotlin (just in case)

bundle exec danger-swift pr <PR_URL> --dangerfile=./tools/danger/dangerfile.js
bundle exec danger-kotlin pr <PR_URL> --dangerfile=./tools/danger/dangerfile.js

Danger user

To let Danger check all the PRs, including PRs form forks, a GitHub account have been created:

  • login: ElementBot
  • password: Stored on Passbolt
  • GitHub token: A token with limited access has been created and added to the repository https://github.com/element-hq/element-x-android as secret DANGER_GITHUB_API_TOKEN. This token is not saved anywhere else. In case of problem, just delete it and create a new one, then update the secret.

PRs from forks do not always have access to the secret secrets.DANGER_GITHUB_API_TOKEN, so secrets.GITHUB_TOKEN is also provided to the job environment. If secrets.DANGER_GITHUB_API_TOKEN is available, it will be used, so user ElementBot will comment the PR. Else secrets.GITHUB_TOKEN will be used, and bot github-actions will comment the PR.

Useful links

Some danger files to get inspired from