GUIX_SUBSTITUTE_FLAG = --substitute-urls='https://ci.guix.gnu.org https://substitutes.nonguix.org'
GUIX_LIB_FLAGS ?= -L ./
LIBVIRT_GROUP ?= libvirt
LIBVIRT_USER ?= $(USER)
GUIX_IMAGE_CMD ?= guix system image $(GUIX_SUBSTITUTE_FLAG) --image-type=qcow2 $(GUIX_LIB_FLAGS)

VM_RAM ?= 4000
VM_CPU ?= 4

%.qcow2: %.scm
	$(eval RO := $(shell $(GUIX_IMAGE_CMD) $<))
	install -C -m 666 -o $(LIBVIRT_USER) -g $(LIBVIRT_GROUP) $(RO) $@

%: %.qcow2
	$(eval OVMF := $(shell guix build $(GUIX_SUBSTITUTE_FLAG) ovmf))
	qemu-system-x86_64 -nic user,model=virtio-net-pci -enable-kvm -hda $< -m $(VM_RAM) -smp $(VM_CPU) -bios $(OVMF)/share/firmware/ovmf_x64.bin

.PHONY: %
%-ro: %.scm
	$(eval VM_SCRIPT := $(shell guix system $(GUIX_LIB_FLAGS) $(GUIX_SUBSTITUTE_FLAG) vm $<))
	$(VM_SCRIPT) -m $(VM_RAM) -smp $(VM_CPU) -nic user,model=virtio-net-pci