check_line_endings.yml

# Validate that there are no files in the repo with invalid line endings
# Files in the repo should contain LF
# The git checkout will transform them to CRLF (configured in the .gitattributes file)
# see https://docs.github.com/en/get-started/getting-started-with-git/configuring-git-to-handle-line-endings

name: CI

on:
  push:
    branches: [ "master" ]
  pull_request:
    branches: [ "master" ]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Check for changes on a fresh checkout
        run: |
          if [[ -n $(git status --porcelain) ]]; then
              git status
              echo "Found changes in a fresh checkout, probably files have been checked in with invalid line endings. See https://docs.github.com/en/get-started/getting-started-with-git/configuring-git-to-handle-line-endings#refreshing-a-repository-after-changing-line-endings"
              exit 1
          fi