name: Cache and install APT packages
description: >-
  Wraps awalsh128/cache-apt-pkgs-action with the workarounds Home Assistant CI
  needs. Removes the conflicting Microsoft apt source before any apt run, and
  points the dynamic linker at the host's multiarch lib subdirectories so
  shared libraries that rely on update-alternatives or postinst-managed paths
  (eg libblas, liblapack pulled in by ffmpeg) stay reachable since the upstream
  action does not execute postinst scripts on cache restore.

inputs:
  packages:
    description: Space-delimited list of apt packages to install.
    required: true
  version:
    description: Cache version. Bump to invalidate the cache.
    required: false
    default: "1"
  execute_install_scripts:
    description: >-
      Pass-through to awalsh128/cache-apt-pkgs-action. Postinst scripts are not
      actually cached by the upstream action, so this is largely a no-op today.
    required: false
    default: "false"

runs:
  using: composite
  steps:
    - name: Remove conflicting Microsoft apt source
      shell: bash
      run: sudo rm -f /etc/apt/sources.list.d/microsoft-prod.list
    - name: Install apt packages via cache
      uses: awalsh128/cache-apt-pkgs-action@acb598e5ddbc6f68a970c5da0688d2f3a9f04d05 # v1.5.3
      with:
        packages: ${{ inputs.packages }}
        version: ${{ inputs.version }}
        execute_install_scripts: ${{ inputs.execute_install_scripts }}
    - name: Refresh dynamic linker cache
      shell: bash
      run: |
        # awalsh128/cache-apt-pkgs-action does not run postinst scripts on
        # cache restore, so update-alternatives symlinks (eg the one libblas
        # creates at /usr/lib/<multiarch>/libblas.so.3) are never produced.
        # Add every /usr/lib/<multiarch> subdirectory that holds shared
        # libraries to the ldconfig search path so the dynamic linker still
        # finds them.  Use dpkg-architecture to derive the host's multiarch
        # tuple so this works on non-x86_64 runners too.
        multiarch="$(dpkg-architecture -qDEB_HOST_MULTIARCH)"
        find "/usr/lib/${multiarch}" -mindepth 2 -maxdepth 2 \
          -name '*.so.*' -printf '%h\n' \
          | sort -u \
          | sudo tee /etc/ld.so.conf.d/zzz-cache-apt-extras.conf > /dev/null
        sudo ldconfig