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CFLAGS += -Wall -Wextra
null :=
space := $(null) $(null)
KERNVER ?= $(lastword $(subst /,$(space),$(wildcard /lib/modules/*/)))
# slightly faster
MAKEFLAGS += -r
FORCE:
all: initramfs.img
initramfs.img: gen_init_cpio make modules.dep $(shell awk '$$1 == "file" { print $$3 }' cpio_list.txt)
KERNVER=$(KERNVER) COMPRESSOR="zstd -19 -c -T0" ./make
gen_init_cpio: gen_init_cpio.c
$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $< -o $@
dropbear_ed25519_host_key:
dropbearkey -t ed25519 -f $@
modules.dep.ver: FORCE
if ! [ -f $@ ] || [ "$$(cat $@)" != "$(KERNVER)" ]; then echo $(KERNVER) > $@; fi
modules.dep: modules modules.dep.ver /lib/modules/$(KERNVER)/modules.dep
awk '!/^#/ { print $$1 }' modules | xargs modinfo -F filename -k $(KERNVER) | sed -e 's:^/lib/modules/$(KERNVER)/:^:' | grep -f - /lib/modules/$(KERNVER)/modules.dep > $@
install: initramfs.img
install -m644 initramfs.img /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 modules.dep
-include initramfs.d
.PHONY: all install clean
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