Manage multiple Dart packages within a single repository.

Installation

> pub global activate mono_repo

Running

> pub global run mono_repo

Or, once you've setup your PATH:

> mono_repo

Prints the following help message:

Manage multiple packages in one source repository.

Usage: mono_repo <command> [arguments]

Global options:
-h, --help              Print this usage information.
    --version           Prints the version of mono_repo.
    --[no-]recursive    Whether to recursively walk sub-directories looking for packages.
                        (defaults to on)

Available commands:
  check       Check the state of the repository.
  generate    Generates the CI configuration for child packages.
  presubmit   Run the CI presubmits locally.
  pub         Run `pub get` or `pub upgrade` against all packages.
  travis      (Deprecated, use `generate`) Configure Travis-CI for child packages.

Run "mono_repo help <command>" for more information about a command.

Configuration

Repo level configuration

To start, you should create a mono_repo.yaml file at the root of your repo.

This controls repo wide configuration.

One option you likely want to configure is which CI providers you want to generate config for. Today both travis and github are supported, and can be configured by adding corresponding entries.

You probably also want to enable the self_validate option, which will add a job to ensure that your configuration is up to date.

So, an example config might look like this:

# Enabled GitHub actions - https://docs.github.com/actions
# If you have no configuration, you can set the value to `true` or just leave it
# empty.
github:
  # Specify the `on` key to configure triggering events.
  # See https://docs.github.com/actions/reference/workflow-syntax-for-github-actions#on
  # The default values is
  # on:
  #   push:
  #     branches:
  #       - main
  #       - master
  #   pull_request:

  # Setting just `cron` is a shortcut to keep the defaults for `push` and
  # `pull_request` while adding a single `schedule` entry.
  # `on` and `cron` cannot both be set.
  cron: '0 0 * * 0' # “At 00:00 (UTC) on Sunday.”
  
  # Specify additional environment variables accessible to all jobs
  env:
    FOO: BAR

  # You can group stages into individual workflows  
  #
  # Any stages that are omitted here are put in a default workflow
  # named `dart.yml`.
  workflows:
    # The key here is the name of the file - .github/workflows/lint.yml
    lint:
      # This populates `name` in the workflow
      name: Dart Lint CI
      # These are the stages that are populated in the workflow file
      stages:
      - analyze

  # You can add custom github actions configurations to run after completion
  # of all other jobs here. This accepts normal github job config except that
  # the `needs` config is filled in for you, and you aren't allowed to pass it.
  on_completion:
    # Example job that pings a web hook url stored in a github secret with a
    # json payload linking to the failed run.
    - name: "Notify failure"
      runs-on: ubuntu-latest
      # By default this job will only run if all dependent jobs are successful,
      # but we want to run in the failure case for this purpose.
      if: failure()
      steps:
        - run: >
            curl -H "Content-Type: application/json" -X POST -d \
              "{'text':'Build failed! ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}'}" \
              "${CHAT_WEBHOOK_URL}"
          env:
            CHAT_WEBHOOK_URL: ${{ secrets.CHAT_WEBHOOK_URL }}

  # You can customize stage ordering as well as make certain stages be
  # conditional here, this is supported for all CI providers. The `if`
  # condition should use the appropriate syntax for the provider it is being
  # configured for.
  stages:
    - name: cron
      # Only run this stage for scheduled cron jobs
      if: github.event_name == 'schedule'

# Enables Travis-CI - https://docs.travis-ci.com/
# If you have no configuration, you can set the value to `true` or just leave it
# empty.
travis:
  # Specify any additional top-level configuration you want in your 
  # `.travis.yml` file.
  # See https://config.travis-ci.com/ for more details
  # Example:
  after_failure:
  - tool/report_failure.sh

# Adds a job that runs `mono_repo generate --validate` to check that everything
# is up to date. You can specify the value as just `true` or give a `stage`
# you'd like this job to run in.
self_validate: analyze

# Use this key to merge stages across packages to create fewer jobs
merge_stages:
- analyze

Adding a package config

To configure a package directory to be included it must contain a mono_pkg.yaml file (along with the normal pubspec.yaml file).

You can use an empty mono_pkg.yaml file to enable the check and pub commands.

To enable generate and presubmit, you must populate mono_pkg.yaml with details on how you'd like tests to be run.

mono_pkg.yaml example

# This key is required. It specifies the Dart SDKs your tests will run under
# You can provide one or more value.
# See https://docs.travis-ci.com/user/languages/dart#choosing-dart-versions-to-test-against
# for valid values
dart:
 - dev

stages:
  # Register two jobs to run under the `analyze` stage.
  - analyze:
    - dartanalyzer
    - dartfmt
  - unit_test:
    - test
  # Example cron stage which will only run for scheduled jobs (here we run
  # multiple OS configs for extra validation as an example).
  #
  # See the `mono_repo.yaml` example above for where this stage is specially
  # configured.
  - cron:
    - test:
      os:
        - linux
        - windows

Running mono_repo generate in the root directory generates two or more files: tool/ci.sh and a configuration file for each configured ci provider.

Look at these repositories for examples of mono_repo usage:

• https://github.com/dart-lang/angular_components
• https://github.com/dart-lang/build
• https://github.com/dart-lang/pub-dev
• https://github.com/dart-lang/source_gen
• https://github.com/dart-lang/test
• https://github.com/dart-lang/webdev
• https://github.com/google/json_serializable.dart