# Copyright (C) 2026 Ilker Manap
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# Builds the MAAS image and publishes it as a Gitea release.
#
# Runs daily, but only *builds* when the Proxmox repository actually carries a
# newer pve-manager than the last published release. Proxmox does not ship daily,
# so an unconditional daily build would produce ~45 GB a month of near-identical
# artifacts for nothing. Trigger manually with `force` to rebuild anyway.
#
# The runner is registered in host mode: steps run directly on the build machine
# as root, because the build needs /dev/kvm, qemu-nbd, FUSE and root privileges.
# Anything that can dispatch a workflow here therefore has root on that machine.

name: build-image

on:
  schedule:
    - cron: '0 3 * * *'
  workflow_dispatch:
    inputs:
      force:
        description: 'Build even if the version has not changed'
        type: boolean
        default: false

concurrency:
  group: build-image
  cancel-in-progress: false

jobs:
  build:
    runs-on: maas-builder
    timeout-minutes: 120

    env:
      GITEA_API: ${{ github.server_url }}/api/v1/repos/${{ github.repository }}
      GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
      KEEP_RELEASES: '3'
      # Rebuild even without a Proxmox version change once an image reaches this
      # age, so Debian base security updates make it into the image.
      MAX_AGE_DAYS: '30'

    steps:
      - name: Check out
        # A plain clone rather than actions/checkout: the runner is in host mode
        # and has no Node.js runtime for JavaScript actions.
        run: |
          set -eux
          # Step out of the workspace before removing it: the shell starts *in*
          # $GITHUB_WORKSPACE, and deleting the current working directory makes
          # every later command fail with "Unable to read current working directory".
          cd /
          rm -rf "$GITHUB_WORKSPACE"
          git clone --depth 1 --branch "$GITHUB_REF_NAME" \
            "$GITHUB_SERVER_URL/$GITHUB_REPOSITORY.git" "$GITHUB_WORKSPACE"
          cd "$GITHUB_WORKSPACE" && git log --oneline -1

      - name: Decide whether to build
        id: decide
        run: |
          set -eu
          cd "$GITHUB_WORKSPACE"
          ./scripts/ci/decide-build.sh "$MAX_AGE_DAYS" > "$GITHUB_OUTPUT"
          if [ "${{ inputs.force }}" = "true" ]; then
            echo "forced by manual trigger"
            sed -i 's/^build=no$/build=yes/' "$GITHUB_OUTPUT"
          fi
          cat "$GITHUB_OUTPUT"

      - name: Build
        if: steps.decide.outputs.build == 'yes'
        run: |
          set -eux
          cd "$GITHUB_WORKSPACE"
          make image

      - name: Verify
        if: steps.decide.outputs.build == 'yes'
        run: |
          set -eux
          cd "$GITHUB_WORKSPACE"
          make verify

      - name: Assemble release artifacts
        if: steps.decide.outputs.build == 'yes'
        run: |
          set -eu
          cd "$GITHUB_WORKSPACE"
          ./scripts/ci/assemble-artifacts.sh "${{ steps.decide.outputs.version }}"

      - name: Publish
        if: steps.decide.outputs.build == 'yes'
        run: |
          set -eu
          cd "$GITHUB_WORKSPACE"
          ./scripts/ci/publish-release.sh \
            "${{ steps.decide.outputs.tag }}" \
            "${{ steps.decide.outputs.version }}" \
            dist

      - name: Prune old releases
        if: steps.decide.outputs.build == 'yes'
        run: |
          set -eu
          cd "$GITHUB_WORKSPACE"
          ./scripts/ci/prune-releases.sh "$KEEP_RELEASES"

      - name: Clean up
        if: always()
        run: |
          # A 1.5 GB artifact per run would fill the builder otherwise.
          # Runs even when an earlier step left the workspace missing, so cd out first.
          cd /
          rm -rf "$GITHUB_WORKSPACE/dist" "$GITHUB_WORKSPACE/build" || true
          df -h / | tail -1