shellcheck.yml

name: shellcheck
on: [pull_request, push]
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
permissions:
  contents: read
jobs:
  shellcheck:
    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.owner.login != github.event.pull_request.base.repo.owner.login
    # https://github.com/actions/runner-images
    runs-on: ubuntu-22.04
    defaults:
      run:
        shell: sh
    steps:
    - name: Setup tmpfs
      run: sudo mount -t tmpfs -o "noatime,lazytime,uid=$(id -u)" tmpfs "$GITHUB_WORKSPACE"
    - uses: actions/checkout@v3
    - name: Setup DietPi-Globals
      run: |
        sudo mkdir -p /boot/dietpi/func
        sudo cp dietpi/func/dietpi-globals /boot/dietpi/func/
        sudo ./dietpi/func/dietpi-obtain_hw_model
        echo 'G_HW_MEMORY_SIZE=1024\nG_HW_ONBOARD_WIFI=1' | sudo tee -a /boot/dietpi/.hw_model
    - name: Download shellcheck
      run: |
        curl -sSfL "$(curl -sSfH 'Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' 'https://api.github.com/repos/koalaman/shellcheck/releases/latest' | mawk -F\" '/"browser_download_url.*\.linux\.x86_64\.tar\.xz"/{print $4;exit}')" -o shellcheck.tar.xz
        tar --wildcards --strip-components=1 -xf shellcheck.tar.xz '*/shellcheck'
        rm shellcheck.tar.xz
    - name: Run shellcheck
      shell: bash
      run: |
        mapfile -t FILES < <(find . -not \( -path './.git' -prune \) -type f) # read all files to array
        for i in "${!FILES[@]}"
        do
            [[ ${FILES[$i]##*/} =~ '.'[^.]*'sh'$ ]] && continue # file has shell extension
            [[ $(mawk '/^#!.*sh([[:blank:]]|$)/;{exit}' "${FILES[$i]}") ]] && continue # file has shell shebang
            unset -v "FILES[$i]" # else remove from array
        done
        ./shellcheck -C -xo all "${FILES[@]}"
    - name: Check for trailing spaces
      if: always()
      run: |
        rm shellcheck
        ! grep -rn --exclude-dir='.git' -I '[[:blank:]]$' .
    - name: Check for multiple newlines
      if: always()
      run: |
        ! grep -rzPo --exclude-dir='.git' --exclude='*.png' '(^|\n)\N*\n\n\n+\N*(\n|$)' .