packer.json

{
  "variables": {
    "DADJOKES_MODE": "{{env `DADJOKES_MODE`}}",
    "debug": "{{env `PI_DEBUG`}}"
  },
  "builders": [{
    "type": "arm",
    "file_urls": ["https://downloads.raspberrypi.org/raspios_lite_armhf/images/raspios_lite_armhf-2021-05-28/2021-05-07-raspios-buster-armhf-lite.zip"],
    "file_checksum_url": "https://downloads.raspberrypi.org/raspios_lite_armhf/images/raspios_lite_armhf-2021-05-28/2021-05-07-raspios-buster-armhf-lite.zip.sha256",
    "file_checksum_type": "sha256",
    "file_target_extension": "zip",
    "image_build_method": "resize",
    "image_path": "dadjokes.img",
    "image_size": "6G",
    "image_type": "dos",
    "image_partitions": [
      {
        "name": "boot",
        "type": "c",
        "start_sector": "8192",
        "filesystem": "vfat",
        "size": "256M",
        "mountpoint": "/boot"
      },
      {
        "name": "root",
        "type": "83",
        "start_sector": "532480",
        "filesystem": "ext4",
        "size": "0",
        "mountpoint": "/"
      }
    ],
    "additional_chroot_mounts": [
      {
        "mount_type": "bind",
        "source_path": "/run/systemd",
        "destination_path": "/run/systemd"
      }
    ],
    "image_chroot_env": [
      "PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin",
      "LC_ALL=C",
      "DEBIAN_FRONTEND=noninteractive",
      "DADJOKES_MODE={{user `DADJOKES_MODE`}}",
      "PI_DEBUG={{user `debug`}}"
    ],
    "qemu_binary_source_path": "/usr/bin/qemu-arm-static",
    "qemu_binary_destination_path": "/usr/bin/qemu-arm-static"
  }],
  "provisioners": [{
    "type": "file",
    "source": "/vagrant/assets/lib/",
    "destination": "/usr/lib/jokes"
  }, {
    "type": "file",
    "source": "/vagrant/assets/jokes.py",
    "destination": "/usr/bin/"
  }, {
    "type": "file",
    "source": "/vagrant/assets/jokes.service",
    "destination": "/etc/systemd/system/"
  }, {
    "type": "shell",
    "environment_vars": ["DADJOKES_MODE={{user `DADJOKES_MODE`}}", "PI_DEBUG={{user `debug`}}"],
    "script": "./rpi-build.sh"
  }]
}