all: initramfs.img

initramfs.img: gen_init_cpio dropbear_ed25519_host_key modules.sh
	./make

gen_init_cpio: gen_init_cpio.c
	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) gen_init_cpio.c -o $@

dropbear_ed25519_host_key:
	dropbearkey -t ed25519 -f $@

modules.sh: modules
	printf '%s\n' '#!/bin/sh' 'set -e' > $@
	xargs -a $< -L1 -r modprobe --show-depends >> $@

install: initramfs.img
	rm -f /boot/initramfs.img.old /boot/initramfs.img.new
	cp initramfs.img /boot/initramfs.img.new || rm -f /boot/initramfs.img.new
	if [ -e /boot/initramfs.img ]; then mv /boot/initramfs.img /boot/initramfs.img.old; fi
	mv /boot/initramfs.img.new /boot/initramfs.img

clean:
	rm -f initramfs.img initramfs.d gen_init_cpio

-include initramfs.d

.PHONY: all install clean
MAKEFLAGS += -r # slightly faster