ipxe

var BootTemplate = template.Must(template.New("iPXE embedded").Parse(`#!ipxe
prompt --key 0x02 --timeout 2000 Press Ctrl-B for the iPXE command line... && shell ||

{{/* print interfaces */}}
ifstat

{{/* retry 10 times overall */}}
set attempts:int32 10
set x:int32 0

:retry_loop

	set idx:int32 0

	:loop
		{{/* try DHCP on each interface */}}
		isset ${net${idx}/mac} || goto exhausted

		ifclose
		iflinkwait --timeout 5000 net${idx} || goto next_iface
		dhcp net${idx} || goto next_iface
		goto boot

	:next_iface
		inc idx && goto loop

	:boot
		{{/* attempt boot, if fails try next iface */}}
		route

		chain --replace http://{{ .Endpoint }}:{{ .Port }}/ipxe?uuid=${uuid}&mac=${net${idx}/mac:hexhyp}&domain=${domain}&hostname=${hostname}&serial=${serial}&arch=${buildarch} || goto next_iface

:exhausted
	echo
	echo Failed to iPXE boot successfully via all interfaces

	iseq ${x} ${attempts} && goto fail ||

	echo Retrying...
	echo

	inc x
	goto retry_loop

:fail
	echo
	echo Failed to get a valid response after ${attempts} attempts
	echo

	echo Rebooting in 5 seconds...
	sleep 5
	reboot
`))

var ErrBootFromDisk = errors.New("boot from disk")