name: Build RPi image

# Yocto (kas) build of rpilinux-image. Steps live in .gitea/actions/* so this
# file stays a description of the pipeline, not a shell script.
#
# Host-specific paths come from repo settings (Settings -> Actions ->
# Variables), so the workflow is not tied to one machine:
#   YOCTO_HOME   persistent build dir on the runner
# Order of precedence for the build dir: this variable, then the runner's
# own YOCTO_HOME (runner.envs), then $HOME/yocto-build.

on:
  push:
    # main is release protected, ci/* branches are free scratch space
    branches: [main, 'ci/*']
  pull_request:
    # gates merges into main and posts the commit status that branch
    # protection waits for
    branches: [main]
  workflow_dispatch:
    inputs:
      skip-build:
        description: Collect images from the existing build dir instead of rebuilding
        type: boolean
        default: false

concurrency:
  group: yocto-rpi-build
  cancel-in-progress: false

permissions:
  contents: read

env:
  YOCTO_HOME: ${{ vars.YOCTO_HOME }}
  MACHINE: raspberrypi4-64
  IMAGE_PREFIX: rpilinux-image

defaults:
  run:
    shell: bash

jobs:
  build:
    runs-on: yocto
    timeout-minutes: 600
    steps:
      - name: Check out sources
        uses: builtin:checkout

      - name: Verify build host
        uses: $/.gitea/actions/check-build-host
        with:
          tools: git python3 curl wget rsync gawk xz diffstat chrpath bison flex node
          min-disk-gb: "200"

      - name: Set up kas
        id: kas
        uses: $/.gitea/actions/setup-kas
        with:
          requirement: kas==5.5

      - name: Build image
        id: image
        uses: $/.gitea/actions/build-image
        with:
          machine: ${{ env.MACHINE }}
          image-prefix: ${{ env.IMAGE_PREFIX }}
          skip-build: ${{ github.event.inputs.skip-build }}

      - name: Upload image
        uses: actions/upload-artifact@v4
        with:
          name: ${{ env.IMAGE_PREFIX }}-${{ env.MACHINE }}
          path: dist/
          retention-days: 14