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# SPDX-License-Identifier: EUPL-1.2
# SPDX-FileCopyrightText: 2021-2022 Alyssa Ross <hi@alyssa.is>
# qemu-kvm is non-standard, but is present in at least Fedora and
# Nixpkgs. If you don't have qemu-kvm, you'll need to set e.g.
# QEMU_KVM = qemu-system-x86_64 -enable-kvm.
QEMU_KVM = qemu-kvm
CPIO = cpio
CPIOFLAGS = --reproducible -R +0:+0 -H newc
MCOPY = mcopy
MKFS_FAT = mkfs.fat
MMD = mmd
OBJCOPY = objcopy
TRUNCATE = truncate
VERITYSETUP = veritysetup
build/initramfs: build/local.cpio $(PACKAGES_CPIO)
cat build/local.cpio $(PACKAGES_CPIO) | gzip -9n > $@
# etc/init isn't included in ETC_FILES, because it gets installed to
# the root.
ETC_FILES = etc/getuuids etc/probe etc/fstab etc/mdev.conf
MOUNTPOINTS = dev mnt/root proc sys tmp
build/local.cpio: $(ETC_FILES) etc/init build/mountpoints
printf "%s\n" $(ETC_FILES) | \
awk '{while (length) { print; sub("/?[^/]*$$", "") }}' | \
sort -u | \
$(CPIO) -o $(CPIOFLAGS) > $@
cd etc && echo init | $(CPIO) -o $(CPIOFLAGS) -AF ../$@
cd build/mountpoints && printf "%s\n" $(MOUNTPOINTS) | \
awk '{while (length) { print; sub("/?[^/]*$$", "") }}' | \
sort -u | \
$(CPIO) -o $(CPIOFLAGS) -AF ../../$@
build/mountpoints:
rm -rf build/mountpoints
mkdir -p build/mountpoints
cd build/mountpoints && mkdir -p $(MOUNTPOINTS)
find build/mountpoints -mindepth 1 -exec touch -d @0 {} ';'
build/cmdline: build/rootfs.verity.roothash
printf "ro console=ttyS0 roothash=" > $@
cat build/rootfs.verity.roothash >> $@
build/bootx64.efi: etc/os-release build/cmdline build/initramfs
$(OBJCOPY) --add-section .osrel=etc/os-release --change-section-vma .osrel=0x20000 \
--add-section .cmdline=build/cmdline --change-section-vma .cmdline=0x30000 \
--add-section .linux=$(KERNEL) --change-section-vma .linux=0x40000 \
--add-section .initrd=build/initramfs --change-section-vma .initrd=0x3000000 \
$(EFI_STUB) $@
build/boot.fat: build/bootx64.efi
$(TRUNCATE) -s 157286400 $@
$(MKFS_FAT) $@
$(MMD) -i $@ ::/EFI ::/EFI/BOOT
$(MCOPY) -i $@ build/bootx64.efi ::/EFI/BOOT
# veritysetup format produces two files, but Make only (portably)
# supports one output per rule, so we combine the two outputs then
# define two more rules to separate them again.
build/rootfs.verity: $(ROOT_FS)
mkdir -p build
$(VERITYSETUP) format $(ROOT_FS) build/rootfs.verity.superblock.tmp \
| awk -F ':[[:blank:]]*' '$$1 == "Root hash" {print $$2; exit}' \
> build/rootfs.verity.roothash.tmp
cat build/rootfs.verity.roothash.tmp build/rootfs.verity.superblock.tmp \
> $@
rm build/rootfs.verity.roothash.tmp build/rootfs.verity.superblock.tmp
build/rootfs.verity.roothash: build/rootfs.verity
head -n 1 build/rootfs.verity > $@
build/rootfs.verity.superblock: build/rootfs.verity
tail -n +2 build/rootfs.verity > $@
build/live.img: scripts/format-uuid.sh scripts/make-gpt.sh build/boot.fat build/rootfs.verity.superblock build/rootfs.verity.roothash $(ROOT_FS) $(EXT_FS)
scripts/make-gpt.sh $@.tmp \
build/boot.fat:c12a7328-f81f-11d2-ba4b-00a0c93ec93b \
build/rootfs.verity.superblock:2c7357ed-ebd2-46d9-aec1-23d437ec2bf5:$$(scripts/format-uuid.sh "$$(dd if=build/rootfs.verity.roothash bs=32 skip=1 count=1 status=none)") \
$(ROOT_FS):4f68bce3-e8cd-4db1-96e7-fbcaf984b709:$$(scripts/format-uuid.sh "$$(head -c 32 build/rootfs.verity.roothash)") \
$(EXT_FS):9293e1ff-cee4-4658-88be-898ec863944f
mv $@.tmp $@
clean:
rm -rf build
.PHONY: clean
run: build/live.img
$(QEMU_KVM) -m 4G \
-bios $(OVMF_FD) \
-cpu host \
-display gtk,gl=on \
-device virtio-vga-gl \
-device qemu-xhci \
-device usb-storage,drive=drive1,removable=true \
-drive file=build/live.img,id=drive1,format=raw,if=none,readonly=true
.PHONY: run
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