name: Build OpenLDAP Base Image

# Publishes ghcr.io/theta42/openldap-nestgroup, the prebuilt slapd-with-
# nestgroup image Dockerfile.openldap's `ldapbuild` stage pulls FROM instead
# of compiling from source on every build (see Dockerfile.openldap-builder
# for why, and the ~5 minute + git.openldap.org-dependent cost it replaces).
#
# Runs only when the builder Dockerfile changes -- bumping OPENLDAP_COMMIT in
# it is the only reason this image should ever need rebuilding -- or on
# manual dispatch.
on:
  push:
    branches: [master]
    paths:
      - 'Dockerfile.openldap-builder'
      - '.github/workflows/build-openldap-image.yml'
  workflow_dispatch: {}

permissions:
  contents: read
  packages: write

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      # Single source of truth for the tag: the ARG default in the Dockerfile
      # itself, not a value duplicated into this workflow.
      - name: Resolve pinned OpenLDAP commit
        id: commit
        run: |
          commit=$(grep -oP '^ARG OPENLDAP_COMMIT=\K[0-9a-f]+' Dockerfile.openldap-builder)
          if [ -z "$commit" ]; then
            echo "::error::Could not resolve OPENLDAP_COMMIT from Dockerfile.openldap-builder"
            exit 1
          fi
          echo "commit=$commit" >> "$GITHUB_OUTPUT"

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v4
        with:
          context: .
          file: ./Dockerfile.openldap-builder
          build-args: |
            OPENLDAP_COMMIT=${{ steps.commit.outputs.commit }}
          push: true
          tags: |
            ghcr.io/theta42/openldap-nestgroup:${{ steps.commit.outputs.commit }}
            ghcr.io/theta42/openldap-nestgroup:latest