.github/workflows/libcxx-build-containers.yml

# This file defines an action that builds the various Docker images used to run
# libc++ CI whenever modifications to those Docker files are pushed to `main`.
#
# The images are pushed to the LLVM package registry at https://github.com/orgs/llvm/packages
# and tagged appropriately. The selection of which Docker image version is used by the libc++
# CI nodes at any given point is controlled from the workflow files themselves.

name: Build Docker images for libc++ CI

permissions:
  contents: read

on:
  push:
    branches:
      - main
    paths:
      - 'libcxx/utils/ci/docker/**'
      - '.github/workflows/libcxx-build-containers.yml'
  pull_request:
    paths:
      - 'libcxx/utils/ci/docker/**'
      - '.github/workflows/libcxx-build-containers.yml'

jobs:
  build-and-push:
    runs-on: ubuntu-24.04
    if: github.repository_owner == 'llvm'
    strategy:
      matrix:
        image_name: ['libcxx-linux-builder-base', 'libcxx-linux-builder', 'libcxx-android-builder']
    permissions:
      packages: write

    steps:
    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
      with:
        persist-credentials: false

    # The default Docker storage location for GitHub Actions doesn't have
    # enough disk space, so change it to /mnt, which has more disk space.
    - name: Change Docker storage location
      run: |
        sudo mkdir /mnt/docker
        echo '{ "data-root": "/mnt/docker" }' | sudo tee /etc/docker/daemon.json
        sudo systemctl restart docker

    - name: Build the image
      run: docker compose --file libcxx/utils/ci/docker/docker-compose.yml build "${{ matrix.image_name }}"
      env:
        TAG: ${{ github.sha }}

    - name: Log in to GitHub Container Registry
      uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4.1.0
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Push the image
      if: github.event_name == 'push'
      run: docker compose --file libcxx/utils/ci/docker/docker-compose.yml push "${{ matrix.image_name }}"
      env:
        TAG: ${{ github.sha }}