neon/.github/workflows/_meta.yml

name: Generate run metadata
on:
  workflow_call:
    inputs:
      github-event-name:
        type: string
        required: true
    outputs:
      build-tag:
        description: "Tag for the current workflow run"
        value: ${{ jobs.tags.outputs.build-tag }}
      previous-storage-release:
        description: "Tag of the last storage release"
        value: ${{ jobs.tags.outputs.storage }}
      previous-proxy-release:
        description: "Tag of the last proxy release"
        value: ${{ jobs.tags.outputs.proxy }}
      previous-compute-release:
        description: "Tag of the last compute release"
        value: ${{ jobs.tags.outputs.compute }}
      run-kind:
        description: "The kind of run we're currently in. Will be one of `push-main`, `storage-release`, `compute-release`, `proxy-release`, `storage-rc-pr`, `compute-rc-pr`,  `proxy-rc-pr`, `pr`, or `workflow-dispatch`"
        value: ${{ jobs.tags.outputs.run-kind }}
      release-pr-run-id:
        description: "Only available if `run-kind in [storage-release, proxy-release, compute-release]`. Contains the run ID of the `Build and Test` workflow, assuming one with the current commit can be found."
        value: ${{ jobs.tags.outputs.release-pr-run-id }}

permissions: {}

defaults:
  run:
    shell: bash -euo pipefail {0}

jobs:
  tags:
    runs-on: ubuntu-22.04
    outputs:
      build-tag: ${{ steps.build-tag.outputs.tag }}
      compute: ${{ steps.previous-releases.outputs.compute }}
      proxy: ${{ steps.previous-releases.outputs.proxy }}
      storage: ${{ steps.previous-releases.outputs.storage }}
      run-kind: ${{ steps.run-kind.outputs.run-kind }}
      release-pr-run-id: ${{ steps.release-pr-run-id.outputs.release-pr-run-id }}
    permissions:
      contents: read
    steps:
      # Need `fetch-depth: 0` to count the number of commits in the branch
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get run kind
        id: run-kind
        env:
          RUN_KIND: >-
            ${{
              false
              || (inputs.github-event-name == 'push'         && github.ref_name == 'main')            && 'push-main'
              || (inputs.github-event-name == 'push'         && github.ref_name == 'release')         && 'storage-release'
              || (inputs.github-event-name == 'push'         && github.ref_name == 'release-compute') && 'compute-release'
              || (inputs.github-event-name == 'push'         && github.ref_name == 'release-proxy')   && 'proxy-release'
              || (inputs.github-event-name == 'pull_request' && github.base_ref == 'release')         && 'storage-rc-pr'
              || (inputs.github-event-name == 'pull_request' && github.base_ref == 'release-compute') && 'compute-rc-pr'
              || (inputs.github-event-name == 'pull_request' && github.base_ref == 'release-proxy')   && 'proxy-rc-pr'
              || (inputs.github-event-name == 'pull_request')                                         && 'pr'
              || (inputs.github-event-name == 'workflow_dispatch')                                    && 'workflow-dispatch'
              || 'unknown'
            }}
        run: |
          echo "run-kind=$RUN_KIND" | tee -a $GITHUB_OUTPUT

      - name: Get build tag
        id: build-tag
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          CURRENT_BRANCH: ${{ github.head_ref || github.ref_name }}
          CURRENT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
          RUN_KIND: ${{ steps.run-kind.outputs.run-kind }}
        run: |
          case $RUN_KIND in
          push-main)
            echo "tag=$(git rev-list --count HEAD)" | tee -a $GITHUB_OUTPUT
            ;;
          storage-release)
            echo "tag=release-$(git rev-list --count HEAD)" | tee -a $GITHUB_OUTPUT
            ;;
          proxy-release)
            echo "tag=release-proxy-$(git rev-list --count HEAD)" | tee -a $GITHUB_OUTPUT
            ;;
          compute-release)
            echo "tag=release-compute-$(git rev-list --count HEAD)" | tee -a $GITHUB_OUTPUT
            ;;
          pr|storage-rc-pr|compute-rc-pr|proxy-rc-pr)
            BUILD_AND_TEST_RUN_ID=$(gh api --paginate \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2022-11-28" \
              "/repos/${GITHUB_REPOSITORY}/actions/runs?head_sha=${CURRENT_SHA}&branch=${CURRENT_BRANCH}" \
              | jq '[.workflow_runs[] | select(.name == "Build and Test")][0].id // ("Error: No matching workflow run found." | halt_error(1))')
            echo "tag=$BUILD_AND_TEST_RUN_ID" | tee -a $GITHUB_OUTPUT
            ;;
          workflow-dispatch)
            echo "tag=$GITHUB_RUN_ID" | tee -a $GITHUB_OUTPUT
            ;;
          *)
            echo "Unexpected RUN_KIND ('${RUN_KIND}'), failing to assign build-tag!"
            exit 1
          esac

      - name: Get the previous release-tags
        id: previous-releases
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh api --paginate \
            -H "Accept: application/vnd.github+json" \
            -H "X-GitHub-Api-Version: 2022-11-28" \
            "/repos/${GITHUB_REPOSITORY}/releases" \
          | jq -f .github/scripts/previous-releases.jq -r \
          | tee -a "${GITHUB_OUTPUT}"

      - name: Get the release PR run ID
        id: release-pr-run-id
        if: ${{ contains(fromJson('["storage-release", "compute-release", "proxy-release"]'), steps.run-kind.outputs.run-kind) }}
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          CURRENT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
        run: |
          RELEASE_PR_RUN_ID=$(gh api "/repos/${GITHUB_REPOSITORY}/actions/runs?head_sha=$CURRENT_SHA" | jq '[.workflow_runs[] | select(.name == "Build and Test") | select(.head_branch | test("^rc/release(-(proxy)|(compute))?/[0-9]{4}-[0-9]{2}-[0-9]{2}$"; "s"))] | first | .id // ("Faied to find Build and Test run from  RC PR!" | halt_error(1))')
          echo "release-pr-run-id=$RELEASE_PR_RUN_ID" | tee -a $GITHUB_OUTPUT