.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'
    permissions:
      packages: write

    steps:
    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1

    # 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 base image
      run: docker compose --file libcxx/utils/ci/docker/docker-compose.yml build libcxx-linux-builder-base
      env:
        TAG: ${{ github.sha }}

    - name: Build the Linux Github Actions image
      run: docker compose --file libcxx/utils/ci/docker/docker-compose.yml build libcxx-linux-builder
      env:
        TAG: ${{ github.sha }}

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

    - name: Log in to GitHub Container Registry
      uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Push the images
      if: github.event_name == 'push'
      run: docker compose --file libcxx/utils/ci/docker/docker-compose.yml push libcxx-linux-builder-base libcxx-linux-builder libcxx-android-builder
      env:
        TAG: ${{ github.sha }}

    # We create tarballs with the images and upload them as artifacts, since that's useful for testing
    # the images when making changes.
    - name: Create image tarballs
      run: |
        docker image save ghcr.io/llvm/libcxx-linux-builder-base:${{ github.sha }} | gzip > libcxx-linux-builder-base.tar.gz
        docker image save ghcr.io/llvm/libcxx-linux-builder:${{ github.sha }} | gzip > libcxx-linux-builder.tar.gz
        docker image save ghcr.io/llvm/libcxx-android-builder:${{ github.sha }} | gzip > libcxx-android-builder.tar.gz
    - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
      with:
          name: libcxx-docker-images
          path: |
            libcxx-linux-builder-base.tar.gz
            libcxx-linux-builder.tar.gz
            libcxx-android-builder.tar.gz