release-sign.yml

# SPDX-License-Identifier: BSD-3-Clause
# Copyright (c) Contributors to the OpenEXR Project.

#
# Releases are signed via https://github.com/sigstore/sigstore-python.
# See https://docs.sigstore.dev for information about sigstore.
#
# This action creates a .tar.gz of the complete Imath source tree at
# the given release tag, signs it via sigstore, and uploads the
# .tar.gz and the associated .tar.gz.sigstore credential bundle.
#
# To verify a downloaded release at a given tag:
# 
#   % pip install sigstore
#   % sigstore verify github --cert-identity https://github.com/AcademySoftwareFoundation/Imath/.github/workflows/release-sign.yml@refs/tags/<tag> Imath-<tag>.tar.gz
#

name: Sign Release

on:
  release:
    types: [published]

permissions:
  contents: read
  
jobs:

  release:
    name: Sign & upload release artifacts
    runs-on: ubuntu-latest
    env:
       RELEASE_TAG: ${{ github.ref_name }}
    permissions:
      contents: write
      id-token: write
      repository-projects: write

    steps:
      - name: Sync Repository
        uses: actions/checkout@v4
        with:
          submodules: recursive

      - name: Create Archive Name
        run: echo "IMATH_ARCHIVE=Imath-${RELEASE_TAG//v}" >> $GITHUB_ENV

      - name: Generate Archives
        run: |
          git archive --prefix ${IMATH_ARCHIVE}/ --output ${IMATH_ARCHIVE}.zip ${RELEASE_TAG}
          git archive --prefix ${IMATH_ARCHIVE}/ --output ${IMATH_ARCHIVE}.tar.gz ${RELEASE_TAG}

      - name: Sign and Upload Archives
        uses: sigstore/gh-action-sigstore-python@v3.0.0
        with:
          inputs: |
            ${{ env.IMATH_ARCHIVE }}.zip
            ${{ env.IMATH_ARCHIVE }}.tar.gz
          upload-signing-artifacts: true
          release-signing-artifacts: true