CoreOS PXE VLAN install

Makefile

#!/usr/bin/env make
# As per CoreOS/ContainerLinux suggestion
# https://coreos.com/os/docs/latest/booting-with-pxe.html#adding-a-custom-oem
ifndef VLAN
$(error VLAN is not set)
endif

all: oem.cpio.gz
	@gzip --stdout --decompress oem.cpio.gz | cpio -it
	@mv oem.cpio.gz ${VLAN}.cpio.gz

etc/systemd/network:
	@mkdir -p $@

vlan.netdev vlan.network eth0.network: etc/systemd/network
	@sed "s;{VLAN};${VLAN};" tpl/$@ > etc/systemd/network/00-$@

oem.cpio: vlan.netdev vlan.network eth0.network
	@find etc | cpio -o -H newc -O oem.cpio
  
oem.cpio.gz: oem.cpio
	@gzip -f oem.cpio

clean:
	@rm -rf ${VLAN}.cpio.gz etc

tpl-eth0.network

[Match]
Name=eth0
[Network]
DHCP=no
VLAN=vlan

tpl-vlan.netdev

[NetDev]
Name=eth0.{VLAN}
Kind=vlan
[VLAN]
Id={VLAN}

tpl-vlan.network

[Match]
Name=eth0.{VLAN}
[Network]
DHCP=yes