packer: opnsense build command

gistfile1.txt

{
	"builders": [
		{
			"type": "virtualbox-iso",
			"boot_command": [
				"<wait60>",
				"installer<enter><wait2>",
				"opnsense<enter><wait10>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<wait60>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<enter><wait2>",
				"<wait60>",
				"root<enter><wait2>",
				"opnsense<enter><wait2>",
				"8<enter><wait5>",
				"dhclient em0<enter><wait10>",
				"telnet {{ .HTTPIP }} {{ .HTTPPort }} | sed '1,/^$/d' >/conf/config.xml<wait><enter>",
				"GET /config.xml HTTP/1.0<enter><enter>",
				"echo 'PasswordAuthentication yes' >> /usr/local/etc/ssh/sshd_config<enter>",
				"service openssh onestart<enter>"
			],
			"boot_wait": "3s",
			"disk_size": "8192",
			"guest_os_type": "FreeBSD_64",
			"headless": true,
			"http_directory": "http",
			"iso_checksum_type": "sha256",
			"iso_checksum": "ce0525586c4ce680a0d67e2ea9d419137b4eef714e77d7d1d2ed1236dc880f54",
			"iso_urls": "./dl/{{ user `base_os` }}-{{user `base_version`}}-amd64-netinst.iso",
			"ssh_username": "root",
			"ssh_password": "opnsense",
			"ssh_port": 22,
			"ssh_wait_timeout": "10000s",
			"shutdown_command": "shutdown -p now",
			"guest_additions_mode": "disable",
			"virtualbox_version_file": ".vbox_version",
			"vm_name": "{{ user `export_name`}}",
			"output_directory": "./builds/{{ user `appliance`}}",
			"vboxmanage": [
				[
					"modifyvm", "{{.Name}}",
					"--memory", "1024"
				],
				[
					"modifyvm", "{{.Name}}",
					"--cpus", "1"
				],
				[
					"modifyvm", "{{.Name}}",
					"--boot1", "disk"
				],
				[
					"modifyvm", "{{.Name}}",
					"--boot2", "dvd"
				],
				[
					"modifyvm", "{{.Name}}",
					"--audio", "none"
				],
				[
					"modifyvm", "{{.Name}}",
					"--usb", "off"
				]
			],
			"format": "ova"
		}
	]
}

gistfile2.txt

	PACKER_LOG=1 packer build \
		-var "base_os=OPNsense" \
		-var "base_version=19.7" \
		-var "export_name=opnsense-build" \
		-var "appliance=opnsense" \
		-force \
		./opnsense.json"