CI: Move Cirrus jobs to GitHub Actions

.github/workflows/main.yml

@@ -0,0 +1,164 @@
+# very similar to the DMD script: https://github.com/dlang/dmd/blob/master/.github/workflows/main.yml
+
+name: Main
+on:
+  - pull_request # without merge conflicts
+  - push # branch or tag
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  posix:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Linux
+          - job_name: Ubuntu 22.04 x64
+            os: ubuntu-22.04
+          - job_name: Ubuntu 22.04 x86
+            os: ubuntu-22.04
+            model: 32
+          # macOS
+          - job_name: macOS 13 x64
+            os: macos-13
+          - job_name: macOS 12 x64
+            os: macos-12
+    name: ${{ matrix.job_name }}
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 40
+    env:
+      # for ci/run.sh:
+      OS_NAME: ${{ startsWith(matrix.os, 'ubuntu') && 'linux' || (startsWith(matrix.os, 'macos') && 'darwin' || '') }}
+      MODEL: ${{ matrix.model || '64' }}
+      HOST_DMD: dmd
+      N: ${{ startsWith(matrix.os, 'macos') && '3' || '2' }}
+      FULL_BUILD: false
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 50
+      - name: Clone DMD
+        run: |
+          set -uexo pipefail
+          ln -s "$GITHUB_WORKSPACE" ../phobos
+
+          ref='${{ github.ref }}'
+          if [[ "$ref" =~ ^refs/pull/ ]]; then
+            # PR: clone the DMD head with the same name as this Phobos PR's target branch
+            # e.g., DMD stable when targeting Phobos stable
+            REPO_BRANCH="$GITHUB_BASE_REF"
+          elif [[ "$ref" =~ ^refs/(heads|tags)/(.*)$ ]]; then
+            # no PR: clone the DMD head with the same name as this Phobos head
+            # e.g., DMD stable for a push to Phobos stable, or DMD v2.105.2 for Phobos tag v2.105.2
+            REPO_BRANCH="${BASH_REMATCH[2]}"
+          else
+            echo "Error: unexpected GitHub ref '$ref'" >&2
+            exit 1
+          fi
+
+          git clone --branch "$REPO_BRANCH" --depth 1 https://github.com/dlang/dmd.git ../dmd
+      - name: Install prerequisites
+        run: cd ../dmd && ${{ runner.os == 'macOS' && 'ci/cirrusci.sh' || 'sudo -E ci/cirrusci.sh' }}
+      - name: Install host compiler
+        run: cd ../dmd && ci/run.sh install_host_compiler
+      - name: Build
+        run: cd ../dmd && ci/run.sh build
+      - name: Test dmd
+        run: cd ../dmd && ci/run.sh test_dmd
+      - name: Test druntime
+        run: cd ../dmd && ci/run.sh test_druntime
+      - name: Test phobos
+        run: cd ../dmd && ci/run.sh test_phobos
+
+  freebsd-vm:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - job_name: FreeBSD 13.2 x64
+            freebsd_version: '13.2'
+          - job_name: FreeBSD 12.4 x64
+            freebsd_version: '12.4'
+    name: ${{ matrix.job_name }}
+    runs-on: macos-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 50
+      - name: Run in VM
+        uses: cross-platform-actions/[email protected]
+        with:
+          operating_system: freebsd
+          hypervisor: qemu
+          memory: 8G
+          sync_files: runner-to-vm
+          version: ${{ matrix.freebsd_version }}
+          shell: bash
+          run: |
+            set -uexo pipefail
+
+            freebsd_version='${{ matrix.freebsd_version }}'
+            freebsd_major="${freebsd_version:0:2}"
+
+            export OS_NAME=freebsd
+            export MODEL=64
+            export HOST_DMD=dmd
+            export N=3
+            export FULL_BUILD=false
+            export CI_DFLAGS="-version=TARGET_FREEBSD${freebsd_major}"
+
+            #if [[ "$freebsd_major" == 12 ]]; then
+            #  sudo sed -i '' -e 's|pkg.FreeBSD.org|mirrors.xtom.com/freebsd-pkg|' /etc/pkg/FreeBSD.conf
+            #fi
+
+            bash --version
+
+            echo '::group::Install git'
+            sudo pkg install -y git
+            echo '::endgroup::'
+
+            echo '::group::Clone DMD'
+            ln -s "$PWD" ../phobos
+
+            ref='${{ github.ref }}'
+            if [[ "$ref" =~ ^refs/pull/ ]]; then
+              REPO_BRANCH="$GITHUB_BASE_REF"
+            elif [[ "$ref" =~ ^refs/(heads|tags)/(.*)$ ]]; then
+              REPO_BRANCH="${BASH_REMATCH[2]}"
+            else
+              echo "Error: unexpected GitHub ref '$ref'" >&2
+              exit 1
+            fi
+
+            git clone --branch "$REPO_BRANCH" --depth 1 https://github.com/dlang/dmd.git ../dmd
+            echo '::endgroup::'
+
+            cd ../dmd
+
+            echo '::group::Install prerequisites'
+            sudo -E ci/cirrusci.sh
+            echo '::endgroup::'
+
+            echo '::group::Install host compiler'
+            ci/run.sh install_host_compiler
+            echo '::endgroup::'
+
+            echo '::group::Build'
+            ci/run.sh build
+            echo '::endgroup::'
+
+            echo '::group::Test dmd'
+            ci/run.sh test_dmd
+            echo '::endgroup::'
+
+            echo '::group::Test druntime'
+            ci/run.sh test_druntime
+            echo '::endgroup::'
+
+            echo '::group::Test phobos'
+            ci/run.sh test_phobos
+            echo '::endgroup::'