.FORCE:

USER := user
PASS := user
GROUPS := sudo

ARCH := amd64
CONFIG := config_base/

PACKAGES := apt bilibop-lockfs btrfs-tools busybox-static bzip2 ca-certificates cron deborphan efibootmgr firmware-linux-free gzip htop ifupdown init iputils-ping irqbalance isc-dhcp-client less live-boot live-boot-initramfs-tools make man-db nbd-client net-tools nmap ntpdate openssh-client openssh-server p7zip-full pciutils rsync squashfs-tools sshfs sudo syslinux syslinux-common syslinux-efi systemd unace unrar-free unzip vim wget wireless-tools wpasupplicant xz-utils zip

include *.mk

.PRECIOUS: stretch_%_root/bin/sh

stretch_%_root/bin/sh:
	btrfs subvolume create "$(subst bin/sh,,$@)" || mkdir "$(subst bin/sh,,$@)"
	chmod 755 "$(subst bin/sh,,$@)"
	debootstrap --arch=${ARCH} --variant=minbase stretch "$(subst bin/sh,,$@)"

stretch_%_root/: stretch_%_root/bin/sh ${CONFIG} permissions .FORCE
	for tree in ${CONFIG}; do for file in apt default timezone; do cp -av "$$tree/etc/$$file" "$@/etc/" || true; done; done
	chroot "$@" ln -sf /bin/true /usr/local/sbin/invoke-rc.d
	chroot "$@" sh -c 'apt-mark showmanual |xargs apt-mark auto || true'
	-chroot "$@" apt-get update
	chroot "$@" umount /proc /dev || true
	chroot "$@" mount -t devtmpfs udev /dev
	chroot "$@" mount -t proc proc /proc
	chroot "$@" apt-get --yes install ${PACKAGES}
	chroot "$@" apt-get --yes --auto-remove purge
	chroot "$@" apt-get --yes --auto-remove upgrade
	chroot "$@" rm /usr/local/sbin/invoke-rc.d
	chroot "$@" umount /proc /dev
	chroot "$@" apt-get clean
	touch "$@"

stretch_%_config/: stretch_%_root/ ${CONFIG} permissions .FORCE
	if [ -d "$@" ]; then btrfs subvolume delete "$@" || rm -r "$@"; else true; fi
	btrfs subvolume snapshot "$<" "$@" || cp -rlv "$<" "$@"
	cp -av $(addsuffix /*, ${CONFIG}) "$@"
	-chroot "$@" locale-gen
	-chroot "$@" update-locale
	-chroot "$@" useradd -M -p "$$(printf %s\\n '${PASS}' |mkpasswd -m sha-256 -s)" '${USER}'
	-for g in ${GROUPS}; do chroot "$@" adduser '${USER}' "$$g"; done
	touch "$@"

stretch_%.squashfs: stretch_%_config/
	rm "$@" || true
	mksquashfs "$<" "$@" -comp xz
	chmod a+r "$@"

vmlinuz: stretch_*_root/
	ln -fs '$<$@' ./

initrd.img: stretch_*_root/
	ln -fs '$<$@' ./

/dev/sd%: partitions .FORCE
	sfdisk ${@} <partitions
	dd of=${@} if=/usr/lib/syslinux/mbr/gptmbr.bin

/dev/sd%1: /dev/sd% vmlinuz initrd.img syslinux.cfg syslia32.cfg syslx64.cfg bootmenu.cfg .FORCE
	mkdir -p mount
	mkfs.vfat -n SQUASHBOOT ${@}
	syslinux -i ${@}
	mount -t vfat ${@} mount
	mkdir -p $(addprefix mount/, EFI/BOOT efi32 efi64 bios)
	cp /usr/lib/SYSLINUX.EFI/efi32/syslinux.efi mount/EFI/BOOT/BOOTIA32.EFI
	cp /usr/lib/SYSLINUX.EFI/efi64/syslinux.efi mount/EFI/BOOT/BOOTX64.EFI
	cp $(addprefix /usr/lib/syslinux/modules/efi32/, ldlinux.e32 menu.c32 libutil.c32) mount/efi32/
	cp $(addprefix /usr/lib/syslinux/modules/efi64/, ldlinux.e64 menu.c32 libutil.c32) mount/efi64/
	cp $(addprefix /usr/lib/syslinux/modules/bios/, menu.c32 libutil.c32) mount/bios/
	cp -L vmlinuz initrd.img *.squashfs Makefile partitions mount/
	cp syslia32.cfg syslx64.cfg syslinux.cfg bootmenu.cfg mount/
	# Temporary workaround, Uncomment for syslinux 6.04+
	cp $(addprefix /usr/lib/syslinux/modules/, efi32/ldlinux.e32 efi64/ldlinux.e64) mount/EFI/BOOT/
	cp syslx64.cfg mount/EFI/BOOT/syslinux.cfg
	umount mount/
	sync

/dev/sd%2: /dev/sd% .FORCE
	mkswap -L SWAP ${@}
	sync

/dev/sd%3: /dev/sd% .FORCE
	mkdir -p mount
	mkfs.btrfs -fL SQUASHCLIENT ${@}
	mount -t btrfs ${@} mount
	btrfs subvolume create mount/home
	chmod 0755 mount/home
	umount mount/
	sync