action.yml

name: "GitHub release"
description: "Create a GitHub release from a file and tag-based description"
inputs:
  filename:
    description: "release tarball to publish"
    required: true
outputs:
  checksum:
    description: "SHA256 checksum of filename"
    value: ${{ steps.publish.outputs.checksum }}
  download:
    description: "URL for downloading filename"
    value: ${{ steps.publish.outputs.download }}
  filename:
    description: "Copy of inputs.filename, to re-use it for other jobs"
    value: ${{ inputs.filename }}
  body:
    description: "Tag details without the subject"
    value: ${{ steps.publish.outputs.body }}

runs:
  using: composite
  steps:
    - name: Extract tag body
      run: git tag --points-at "${{ github.ref }}" --format '%(contents:body)' | grep . | tee release-body
      shell: bash

    - name: Publish release
      id: publish
      uses: actions/github-script@v7
      with:
        script: |
          const fs = require('fs');
          const version = '${{ github.ref }}'.split('/').pop();
          const release_body = fs.readFileSync('release-body', {encoding: 'utf-8'});

          const source = fs.readFileSync('${{ inputs.filename }}');

          const release = await github.rest.repos.createRelease({
              owner: context.repo.owner, repo: context.repo.repo,
              tag_name: version, name: version, body: release_body, draft: true
              });

          /* We get a lot of connection reset errors... */
          for (let retry = 0; retry < 5; retry++) {
              try {
                  const upload = await github.rest.repos.uploadReleaseAsset({
                      owner: context.repo.owner, repo: context.repo.repo, release_id: release.data.id,
                      name: '${{ inputs.filename }}', headers: {'Content-Type': 'application/x-xz'}, data: source});
                  break;
              } catch (error) {
                  console.log(`Failed to upload (status ${error.status})`);
                  if (error.status != 500) {
                      throw error;
                  }
              }
          }

          const update = await github.rest.repos.updateRelease({
            owner: context.repo.owner, repo: context.repo.repo, release_id: release.data.id,
            draft: false});

          core.setOutput('checksum', require('crypto').createHash('sha256').update(source).digest('hex'));
          core.setOutput('download', update.data.assets[0].browser_download_url);
          core.setOutput('body', release_body);