{
  "variables": {
    "access_key" : "{{env `ALICLOUD_ACCESS_KEY`}}",
    "secret_key" : "{{env `ALICLOUD_SECRET_KEY`}}"
  },
  "builders": [
    {
      "type"                 : "alicloud-ecs",
      "access_key"           : "{{user `access_key`}}",
      "secret_key"           : "{{user `secret_key`}}",
      "image_name"           : "ubuntu_18_04_64_custom_20180719",
      "source_image"         : "ubuntu_16_0402_64_20G_alibase_20180409.vhd",
      "region"               : "cn-hongkong",
      "ssh_username"         : "root",
      "instance_type"        : "ecs.t5-lc2m1.nano",
      "internet_charge_type" : "PayByTraffic",
      "io_optimized"         : "true"
    }
  ],
  "provisioners": [
    {
      "type": "file",
      "source": "./apt.conf",
      "destination": "/etc/apt/apt.conf"
    },
    {
      "type": "shell",
      "environment_vars": [
        "DEBIAN_FRONTEND=noninteractive",
        "DEBIAN_PRIORITY=critical"
      ],
      "inline": [
        "apt-get -y update",
        "apt-get -o Dpkg::Options::=--force-confnew -y upgrade",
        "apt-get -o Dpkg::Options::=--force-confnew -y dist-upgrade",
        "apt-get -y autoremove --purge",
        "apt-get -y autoclean",
        "do-release-upgrade -d -f DistUpgradeViewNonInteractive",
        "apt-get -y autoremove --purge",
        "apt-get -y autoclean",
        "echo '' > /etc/apt/apt.conf"
      ]
    }
  ]
}