# -------------------------------------------------------------------------
# Name: vm-libvirt-arch-minimal
# Desc: Create a minimal Arch Linux VM install on a libvirt/kvm hypervisor.
# -------------------------------------------------------------------------

#--------------------
# Requirements block.
#--------------------

packer {
  required_plugins {
    libvirt = {
      version = ">= 0.3.4"
      source  = "github.com/thomasklein94/libvirt"
    }
  }
}

# ----------------
# Variables block.
# ----------------

data "http" "image_checksum" {
	url							= var.checksum_url
}

locals {
	image_checksum	=	split(" ",data.http.image_checksum)[0]
  libvirt_uri			= "qemu+ssh://${var.host_ssh_user}@${var.host_ssh_address}/system"
	nvram_path			=	"${var.nvram_path_base}/${var.guest_hostname}_VARS.fd"
	cidata_name			= "${var.volume_name}_cidata"
}

#---------------
# Sources block.
#---------------

source "libvirt" "arch-minimal" {
	libvirt_uri			= local.libvirt_uri
	domain_name			= var.guest_hostname
	vcpu						= var.cpu_count
	memory					= var.memory
	boot_devices		=	["hd"]
	shutdown_mode		=	"guest"
	domain_type			=	var.domain_type
	arch						=	var.arch
	chipset					=	var.chipset
	loader_type			=	var.loader_type
	loader_path			= var.loader_path
	nvram_template	=	var.nvmram_template
	nvram_path			=	local.nvram_path
	secure_boot			=	var.secure_boot

	volume {
		alias				=	"artifact"
		name				=	var.volume_name
		pool				= var.volume_pool
		readonly		=	false
		target_dev	=	"vda"
		bus					=	"virtio"
		format			=	"qcow2"
		size				=	"2G"
		capacity		=	var.volume_capacity
		source {
			type			=	"external"
			urls			=	[var.image_url]
			checksum	= local.image_checksum
		}
	}

	volume {
		alias				=	"cidata"
		name				=	local.cidata_name
		pool				=	var.volume_pool
		readonly		= true
		source {
			type						=	"cloud-init"
			
			meta_data				=	jsonencode({
				"instance-id"	=	${var.guest_hostname}
				"hostname"		= ${var.guest_hostname}
			})

			user_data				=	format("#cloud-config\n%s", jsonencode({
				"packages"			=	[
					"qemu-guest-agent",
					"ufw"
				]
				"runcmd"				=	[
					["systemctl", "enable", "--now", "qemu-guest-agent"],
					["ufw", "enable"],
					["ufw", "allow", "from", ${var.ssh_source}, "to", "port", "22", "proto", "tcp"],
					["systemctl", "enable", "--now", "ufw"]
				]
			}))

			network_config	=	jsonencode({
				renderer = "networkd"
				version	=	2
				ethernets	=	{
					eth0 = {
						match	=	{
							name	=	"en*"
						}
						dhcp4	=	false
						addresses = [${var.network_address}]
						gateway4 = ${var.network_gateway}
						nameservers = {
							addresses = [${var.network_nameserver}]
							search = [${var.network_domain}]
						}
					}
				}
			})

		}
	}

	artifact_volume_alias		=	"artifact"

	network_interface	{
		type		=	"bridge"
		bridge	= var.bridge_name
		model		=	"virtio"
		alias		= "default-network"
	}
	network_address_source	=	"agent"

	graphics {
		type		=	"spice"
		port		=	5900
	}

	communicator {
		ssh_username		= var.guest_ssh_user
		ssh_port				= var.guest_ssh_port
		ssh_private_key	= var.guest_ssh_private_key
	}
	communicator_interface	=	"default-network"
}

#-------------
# Build block.
#-------------

build {
	sources		=	["source.libvirt.arch-minimal"]
}