# Inspired by https://www.codemadness.org/openbsd-riscv64-vm.html
# mirror list: https://www.openbsd.org/ftp.html
# mirror := https://mirror.hs-esslingen.de/pub/OpenBSD/
mirror := https://ftp.lysator.liu.se/pub/OpenBSD/
release := 7.5
release_short := $(shell echo ${release} | sed 's/\.//g')# Without dots (7.5 -> 75)

diskname := openBSD$(release_short).qcow2
opensbiname := opensbi-1.2.tgz
ubootname := u-boot-riscv64-2021.10p8.tgz

release_pubkey := openbsd-$(release_short)-base.pub
release_pubkey_url := https://ftp.openbsd.org/pub/OpenBSD/7.5/$(release_pubkey)
CURL := @curl --progress-bar -O

minirootname := miniroot$(release_short).img

$(release_pubkey):
	$(CURL) ${release_pubkey_url}

$(minirootname): $(release_pubkey)
	$(CURL) ${mirror}/${release}/riscv64/${minirootname}
	$(CURL) ${mirror}/${release}/riscv64/SHA256
	$(CURL) ${mirror}/${release}/riscv64/SHA256.sig
	signify -C -p ${release_pubkey} -x SHA256.sig $(minirootname)

$(diskname):
	qemu-img create -f qcow2 ${diskname} 10G

repokeys: $(release_pubkey)
	$(CURL) ${mirror}/${release}/packages/amd64/SHA256
	$(CURL) ${mirror}/${release}/packages/amd64/SHA256.sig

checksums: repokeys
	cksum -a sha256 --ignore-missing -c SHA256

$(opensbiname): repokeys
	$(CURL) ${mirror}/${release}/packages/amd64/${opensbiname}
	@# signify -C -p ${release_pubkey} -x SHA256.sig $(opensbiname)
	@tar -xzf ${opensbiname} share/opensbi/generic/fw_jump.bin

$(ubootname): repokeys
	$(CURL) ${mirror}/${release}/packages/amd64/${ubootname}
	@# signify -C -p ${release_pubkey} -x SHA256.sig $(ubootname)
	@tar -xzf ${ubootname} share/u-boot/qemu-riscv64_smode/u-boot.bin

installer: $(minirootname) $(diskname) $(opensbiname) $(ubootname)
	make checksums
	@echo "Starting VM with installer..."
	@qemu-system-riscv64 \
		-machine virt \
		-nographic \
		-m 2048M \
		-smp 2 \
		-bios share/opensbi/generic/fw_jump.bin \
		-kernel share/u-boot/qemu-riscv64_smode/u-boot.bin \
		-drive file=$(minirootname),format=raw,id=cd0 -device virtio-blk-device,drive=cd0 \
		-drive file=$(diskname),format=qcow2,id=hd0 -device virtio-blk-device,drive=hd0 \
		-netdev user,id=net0,ipv6=off -device virtio-net-device,netdev=net0

run:
	@echo "Starting VM from disk image..."
	@qemu-system-riscv64 \
		-machine virt \
		-nographic \
		-m 2048M \
		-smp 2 \
		-bios share/opensbi/generic/fw_jump.bin \
		-kernel share/u-boot/qemu-riscv64_smode/u-boot.bin \
		-drive file=$(diskname),format=qcow2,id=hd0 -device virtio-blk-device,drive=hd0 \
		-netdev user,id=net0,ipv6=off -device virtio-net-device,netdev=net0

clean:
	rm -f ${minirootname} ${diskname} ${opensbiname} ${ubootname} ${release_pubkey} SHA256 SHA256.sig
	rm -rf share

.PHONY: installer run clean