netboot.xyz/roles/netbootxyz/templates/disks/ipxe-bootloader.j2

#!ipxe
set esc:hex 1b
set bold ${esc:string}[1m
set boldoff ${esc:string}[22m
set fg_gre ${esc:string}[32m
set fg_cya ${esc:string}[36m
set fg_whi ${esc:string}[37m
set TFTP_ERR Local TFTP failed... attempting remote HTTPS 
set HTTPS_ERR HTTPS appears to have failed... attempting HTTP
set HTTP_ERR HTTP has failed, localbooting...
set boot_domain {{ boot_domain }}
set version {{ boot_version }}

:start
echo ${bold}${fg_gre}${boot_domain} - ${fg_whi}v${version}${boldoff}
echo ${bold}${fg_whi}Powered by${fg_gre}netboot.xyz${boldoff}
prompt --key m --timeout 4000 Hit the ${bold}m${boldoff} key to open failsafe menu... && goto failsafe || goto dhcp

:dhcp
echo
dhcp || goto netconfig
goto menu

:failsafe
menu ${boot_domain} Failsafe Menu
item localboot Boot to local drive
item netconfig Manual network configuration
item retry Retry boot
item debug iPXE Debug Shell
item reboot Reboot System
choose failsafe_choice || exit
goto ${failsafe_choice}

:netconfig
echo Network Configuration:
echo Available interfaces...
ifstat
imgfree
echo -n Set network interface number [0 for net0, defaults to 0]: ${} && read net
isset ${net} || set net 0
echo -n IP: && read net${net}/ip
echo -n Subnet mask: && read net${net}/netmask
echo -n Gateway: && read net${net}/gateway
echo -n DNS: && read dns
ifopen net${net}
echo Attempting chainload of ${boot_domain}...
goto menu || goto failsafe

:menu
chain --autofree tftp://${next-server}/menu.ipxe || echo ${TFTP_ERR}
set conn_type https
chain --autofree https://${boot_domain}/menu.ipxe || echo ${HTTPS_ERR}
sleep 5
set conn_type http
chain --autofree http://${boot_domain}/menu.ipxe || echo ${HTTP_ERR}
goto localboot

:localboot
exit

:retry
goto start

:reboot
reboot
goto start

:debug
echo Type "exit" to return to menu
shell
goto failsafe