{
  "variables": {
    "memory": "4G",
    "cpus": "2",

    "iso_url": "https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-9.8.0-amd64-netinst.iso",
    "iso_checksum": "cc4a6bd50925c1c4af98049060e304494bc9da61eb5eb272c556d67608de14d4e6a4b8bc1c9412a0f810083912e228569f3771ffffa7174538f3e26f45a05245",
    "iso_checksum_type": "sha512",

    "boot_wait": "3s",
    "boot_key_interval": "10ms",

    "ssh_username": "unifi",
    "ssh_password": "uuunifi",
    "ssh_timeout": "60m",

    "machine_hostname": "unifi-controller",
    "machine_domain": "lab.uncomfortably.online",

    "http_directory": "http/",
    "preseed_file": "preseed.cfg"
  },
  "builders": [
    {
      "type": "qemu",
      "accelerator": "kvm",
      "qemuargs": [
        [ "-m", "{{ user `memory` }}" ],
        [ "-smp", "cpus={{ user `cpus`}}"]
      ],

      "iso_url": "{{user `iso_url`}}",
      "iso_checksum": "{{user `iso_checksum`}}",
      "iso_checksum_type": "{{user `iso_checksum_type`}}",

      "http_directory": "{{user `http_directory`}}",

      "boot_wait": "{{user `boot_wait`}}",
      "boot_key_interval": "{{user `boot_key_interval`}}",
      "boot_command": [
        "<esc><wait>",
        "install ",
        "auto=true ",
        "url=http://{{.HTTPIP}}:{{.HTTPPort}}/{{user `preseed_file`}} ",

        "hostname={{user `machine_hostname`}} ",
        "domain={{user `machine_domain`}} ",
        "interface=auto ",

        "passwd/user-fullname={{user `ssh_username`}} ",
        "passwd/username={{user `ssh_username`}} ",
        "passwd/user-password={{user `ssh_password`}} ",
        "passwd/user-password-again={{user `ssh_password`}} ",

        "<enter>"
      ],

      "communicator": "ssh",
      "ssh_username": "{{user `ssh_username`}}",
      "ssh_password": "{{user `ssh_password`}}",
      "ssh_timeout": "{{user `ssh_timeout`}}"
    }
  ]
}