action.yaml

name: git-release
description: Retrieve the tag and tag message from the git HEAD of a working copy
inputs:
  ref:
    description: The git ref to use. Defaults to `github.ref`.
    default: ${{ github.ref }}
    required: false
  working-directory:
    description: The working copy of the git repository to extract the tag and tag message from.
    default: "."
    required: false
outputs:
  tag:
    description: The git tag
    value: ${{ steps.tag.outputs.tag }}
  message:
    description: The git tag message
    value: ${{ steps.message.outputs.message }}
runs:
  using: composite
  steps:
  - name: Get tag from ref
    shell: bash
    id: tag
    run: |
      readarray -t -d $'\n' refs < <(git -C "${{ inputs.working-directory }}" tag -l --points-at "${{ inputs.ref }}")
      if [[ ${#refs[@]} -ne 1 ]]; then
        printf 'Unable to uniquely determine the tag from the ref '%s', make sure to checkout using ${{ '${{ github.ref }}' }}:\n    - uses: actions/checkout@v4\n      with:\n        ref: ${{ '${{ github.ref }}' }}\n' "$REF" >&2
        exit 1
      fi
      printf "tag=%s\n" "${refs[0]}" >> $GITHUB_OUTPUT
  - name: Get tag message
    shell: bash
    id: message
    run: |
      eof="$(openssl rand -hex 8)"
      msg=$(git -C "${{ inputs.working-directory }}" tag -l --format='%(contents)' "${{ steps.tag.outputs.tag }}")
      msg=${msg%%'-----BEGIN'*}
      printf "message<<%s\n%s\n%s\n" "$eof" "$msg" "$eof" >> $GITHUB_OUTPUT