name: 'Cache APT Packages'
description: 'Install APT based packages and cache them for future runs.'
author: awalsh128
branding:
  icon: 'hard-drive'  
  color: 'green'

inputs:
  packages:
    description: 'Space delimited list of packages to install.'
    required: true
    default: ''

outputs:
  cache-hit:
    description: 'A boolean value to indicate a cache was found for the packages requested.'
    value: ${{ steps.load-pkg-cache.outputs.cache-hit }}

runs:
  using: "composite"
  steps:
    - name: Validate Packages
      run: ${{ github.action_path }}/validate_pkgs.sh ${{ inputs.packages }}
      shell: bash

    - name: Create Cache Key
      run: echo ${{ inputs.packages }} | sed 's/[\s,]+/\n/g' | sort > /tmp/package_list.txt
      shell: bash

    - name: Load Package Cache
      id: load-pkg-cache
      uses: actions/cache@v2
      with:
        path: ~/cache-apt-pkgs
        key: cache-apt-pkgs_${{ hashFiles('/tmp/package_list.txt') }}

    - name: Load Packages      
      run: |
        if [ ${{ steps.load-pkg-cache.outputs.cache-hit }} ]; then
          ${{ github.action_path }}/restore_pkgs.sh ~/cache-apt-pkgs /
        else
          ${{ github.action_path }}/install_and_cache_pkgs.sh ~/cache-apt-pkgs ${{ inputs.packages }}
        fi
      shell: bash