# This workflow provides automated testing. It builds and runs tests on each PR.

name: ci

# We want to run CI on all pull requests. Additionally, Bors needs workflows to
# run on the `staging` and `trying` branches.
on:
  pull_request:
  push:
    branches:
      - staging
      - trying

jobs:
  ci:
    # Using ubuntu-latest can cause breakage when ubuntu-latest is updated to
    # point at a new Ubuntu version. Instead, explicitly specify the version, so
    # we can update when we need to. This *could* break if we don't update it
    # until support for 18.04 is dropped, but it is likely we'll have a reason
    # to update to a newer Ubuntu before then anyway.
    runs-on: ubuntu-18.04

    steps:
      # Clones a single commit from the libtock-rs repository. The commit cloned
      # is a merge commit between the PR's target branch and the PR's source.
      # Note that we checkout submodules so that we can invoke Tock's CI setup
      # scripts, but we do not recursively checkout submodules as we need Tock's
      # makefile to set up the qemu submodule itself.
      - name: Clone repository
        uses: actions/checkout@v2.3.0
        with:
          submodules: true

      # The main test step. We let the makefile do most of the work because the
      # makefile can be tested locally. We experimentally determined that -j2 is
      # optimal for the Azure Standard_DS2_v2 VM, which is the VM type used by
      # GitHub Actions at the time of this writing.
      - name: Build and Test
        run: |
          cd "${GITHUB_WORKSPACE}"
          make -j2 setup
          make -j2 test