# Copyright (C) 2024 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
#
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or (at
# your option) any later version.
#
# This file is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

dist_pkgdata_DATA = rootfs.img

EXTRA_QEMU_ARGS =
if WANT_KVM
EXTRA_QEMU_ARGS += -enable-kvm
endif # WANT_KVM

gnupg/pubring.kbx: ${srcdir}/D24DDAC9226D5BA5E9F3BED3F5DAAAF74AD4C938.asc
	install -d gnupg
	gpg \
		--home=gnupg \
		--import \
		${srcdir}/D24DDAC9226D5BA5E9F3BED3F5DAAAF74AD4C938.asc || \
		rm -rf gnupg

.PHONY: check-trisquel-installation-image
check-trisquel-installation-image: $(TRISQUEL_NETINSTALL) gnupg/pubring.kbx
	gpg --home=gnupg \
		--verify trisquel-netinst_11.0_amd64.iso.asc \
		$(TRISQUEL_NETINSTALL)

grub/boot/linux: Makefile check-trisquel-installation-image
	install -D -d grub/boot
	xorriso -osirrox on \
		-indev $(TRISQUEL_NETINSTALL) \
		-extract /linux $@
	chmod 770 $@

grub/boot/initrd.gz: Makefile check-trisquel-installation-image
	install -D -d grub/boot
	xorriso -osirrox on \
		-indev $(TRISQUEL_NETINSTALL) \
		-extract /initrd.gz $@
	chmod 770 $@

grub/boot/grub/grub.cfg: Makefile grub.cfg
	install -D -m 660 grub.cfg $@

# It is way more simple to just extract the kernel and initramfs and
# write some grub.cfg by hand than to somehow modify an existing
# installer iso.
grub.iso: Makefile grub/boot/linux grub/boot/initrd.gz grub/boot/grub/grub.cfg
	grub-mkrescue -o $@ grub

preseed.img: Makefile preseed.cfg
	dd if=/dev/zero of=$@.tmp count=2048
	mkfs.vfat --mbr=y -n MEDIA $@.tmp
	mcopy -i $@.tmp preseed.cfg ::/preseed.cfg
	mv $@.tmp $@

rootfs.img.tmp: Makefile
	qemu-img create -f qcow2 $@ $(TRISQUEL_ROOTFS_SIZE)

# The 790M were found by trial and error. At 789M the netinstall
# complains about "low memory".
rootfs.img: preseed.img rootfs.img.tmp grub.iso
	install -m 644 rootfs.img.tmp rootfs.img || rm -f rootfs.img

	qemu-system-x86_64 \
	-M q35 \
	-m 790M \
	-nographic \
	-drive file=grub.iso,index=2,media=cdrom,if=ide \
	-drive file=rootfs.img.tmp,index=1,media=disk,if=virtio \
	-drive file=preseed.img,index=0,media=disk,if=none,format=raw,id=usb \
	-usb -device usb-ehci,id=ehci -device usb-storage,bus=ehci.0,drive=usb \
	$(EXTRA_QEMU_ARGS) || \
	\
	rm -f rootfs.img