name: Get submodule hash
description: Tries to acquire the hash of a submodule
inputs:
  submodule:
    description: Path to submodule (relative from repo root)
    required: true
outputs:
  hash:
    description: The hash of the submodule
    value: ${{ steps.get-submodule-hash.outputs.hash }}
runs:
  using: composite
  steps:
    - id: get-submodule-hash
      run: |
        SUBMODULE_HASH="$(git submodule | awk '{ if ($2 == "${{ inputs.submodule }}") print $1 }')"
        if [[ -z "${SUBMODULE_HASH}" ]]
        then
          echo ERROR: could not get hash for submodule ${{ inputs.submodule }}
          git submodule
          exit 1
        fi
        echo "::set-output name=hash::${SUBMODULE_HASH#"-"}"
      shell: bash