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Branch builds

Branch builds are a way to build and test Fenix using branches from application-services and firefox-android. iOS is not currently supported, although we may add it in the future (see #4966).

Breaking changes in an application-services branch.

When we make breaking changes in an application-services branch, we typically make corresponding changes in an android-components branch. Branch builds allow combining those branches together in order to run CI tests and to produce APKs for manual testing. To trigger a branch build for this:

  • Create the PR for the application-services branch you're working on
  • Add [firefox-android: branch-name] to the PR title
  • The branch build tasks will be listed as checks the Github PR. In particular:
    • branch-build-fenix-test and branch-build-ac-test will run the unit android-components/fenix unit tests
    • branch-build-fenix-build will contain the Fenix APK.

Application-services nightlies

When we make non-breaking changes, we typically merge them into main and let them sit there until the next release. In order to check that the current main really does only have non-breaking changes, we run a nightly branch build from the main branch of application-services,

  • To view the latest branch builds:
    • Open the latest decision task from the task index.
    • Click the "View Task" link
    • Click "Task Group" in the top-left
    • You should now see a list of tasks from the latest nightly
      • *-build were for building the application. A failure here indicates there's probably a breaking change that needs to be resolved.
      • To get the APK, navigate to branch-build-fenix-build and download app-x86-debug.apk from the artifacts list
      • branch-build-ac-test.* are the android-components tests tasks. These are split up by gradle project, which matches how the android-components CI handles things. Running all the tests together often leads to failures.
      • branch-build-fenix-test is the Fenix tests. These are not split up per-project.
  • These builds are triggered by our .cron.yml file