# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json

name: Changes

on:

workflow_call:

inputs:

paths:

description: |

Newline-separated list of path prefixes to check for changes against origin/main.

Example:

docker/

.github/workflows/docker.yaml

required: true

type: string

outputs:

changed:

description: "true if any file under the given paths changed on this branch compared to origin/main"

value: ${{ jobs.changes.outputs.changed }}

jobs:

changes:

runs-on: ubuntu-latest

outputs:

changed: ${{ steps.changes.outputs.changed }}

steps:

- uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3

with:

fetch-depth: 0

- name: Check for changes

id: changes

run: |

mergeBase=$(git merge-base origin/main "${{ github.sha }}")

if [ "$mergeBase" = "${{ github.sha }}" ]; then

mergeBase=$(git rev-parse "${{ github.sha }}~1")

fi

pattern=$(echo "${{ inputs.paths }}" | sed '/^$/d' | sed 's|.*|^&|' | paste -sd'|')

if git diff --name-only "$mergeBase" "${{ github.sha }}" | grep -Eq "$pattern"; then

echo "changed=true" >> $GITHUB_OUTPUT

else

echo "changed=false" >> $GITHUB_OUTPUT

fi

- name: Report changes

run: echo "changed=${{ steps.changes.outputs.changed }}"