+ { cd "$${CFGROOT}"; printf '%s\n' boot/*; } \
+ | mksquashfs "$${CFGROOT}" "$@" -comp xz -ef /dev/stdin
+
+${VOLUME}: .FORCE
+ ! printf '%s\n' "$${VOLUME}" |grep -q '^/dev/' # abort if volume should be real device
+ dd count=0 of="$${VOLUME}" # truncate
+ dd bs=1M count=0 seek=$$((3 + ${BOOT_MB} + ${ROOT_MB})) of="$${VOLUME}"
+ chmod g+w "$${VOLUME}"
+
+${PBOOT}: .FORCE
+ ! printf '%s\n' "$${PBOOT}" |grep -q '^/dev/' # abort if volume should be real device
+ dd count=0 of="$${PBOOT}" # truncate
+ dd bs=1M count=0 seek=${BOOT_MB} of="$${PBOOT}"
+
+${PROOT}: .FORCE
+ ! printf '%s\n' "$${PROOT}" |grep -q '^/dev/' # abort if volume should be real device
+ dd count=0 of="$${PROOT}" # truncate
+ dd bs=1M count=0 seek=${ROOT_MB} of="$${PROOT}"
+
+_partition_raspi: ${VOLUME}
+ printf 'label: dos\n\n: start=2MiB, size=%iMiB, type=c\n: start=%iMiB, size=%iMiB, type=83\n' \
+ ${BOOT_MB} "$$((${BOOT_MB} + 2))" ${ROOT_MB} | sfdisk "$${VOLUME}"
+
+_partition_gpt: ${VOLUME}
+ printf 'label: gpt\n\n: start=2MiB, size=%iMiB, type=1, attrs="LegacyBIOSBootable"\n: size=%iMiB, type=20\n' \
+ ${BOOT_MB} ${ROOT_MB} | sfdisk "$${VOLUME}"
+
+_sparse: ${PBOOT} ${PROOT}
+
+ifdef raspi
+_format_root: ${PROOT}
+ -umount "$${CFGROOT}/boot" "$${CFGROOT}" "${PROOT}"
+ mkfs.nilfs2 -f -L FSROOT "$${PROOT}"
+else
+_format_root: ${PROOT}
+ -umount "$${CFGROOT}/boot" "$${CFGROOT}" "${PROOT}"
+ mkfs.ext4 -F -L FSROOT "$${PROOT}"
+endif
+
+_format_boot: ${PBOOT}
+ -umount "$${CFGROOT}/boot" "${PBOOT}"
+ mkfs.fat -F 32 -n BOOT "$${PBOOT}"
+
+_format: _format_root _format_boot
+
+_iso_image: ${ISOROOT}
+ grub-mkrescue -o "$${ISO}" "$${ISOROOT}"
+
+.PHONY: _syslinux_efi32 _syslinux_efi64 _syslinux_bios
+.PHONY: _grub_efi32 _grub_efi64
+
+_syslinux_efi32: ${CFGROOT}
+ mkdir -p "$${CFGROOT}/boot/EFI/BOOT"
+ cp /usr/lib/SYSLINUX.EFI/efi32/syslinux.efi "$${CFGROOT}/boot/EFI/BOOT/BOOTIA32.EFI"
+ mkdir -p "$${CFGROOT}/boot/efi32"
+ cp $(addprefix /usr/lib/syslinux/modules/efi32/, ldlinux.e32 menu.c32 libutil.c32) "$${CFGROOT}"/boot/efi32/
+ cp /usr/lib/syslinux/modules/efi32/ldlinux.e32 "$${CFGROOT}/boot/EFI/BOOT/" # workaround
+ printf 'PATH /efi32\nINCLUDE /bootmenu.cfg\nMENU TITLE Syslinux EFI-32\n' >"$${CFGROOT}/boot/syslia32.cfg"
+
+_syslinux_efi64: ${CFGROOT}
+ mkdir -p "$${CFGROOT}/boot/EFI/BOOT"
+ cp /usr/lib/SYSLINUX.EFI/efi64/syslinux.efi "$${CFGROOT}/boot/EFI/BOOT/BOOTX64.EFI"
+ mkdir -p "$${CFGROOT}/boot/efi64"
+ cp $(addprefix /usr/lib/syslinux/modules/efi64/, ldlinux.e64 menu.c32 libutil.c32) "$${CFGROOT}"/boot/efi64/
+ cp /usr/lib/syslinux/modules/efi64/ldlinux.e64 "$${CFGROOT}/boot/EFI/BOOT/" # workaround
+ printf 'PATH /efi64\nINCLUDE /bootmenu.cfg\nMENU TITLE Syslinux EFI-64\n' >"$${CFGROOT}/boot/syslx64.cfg"
+
+_syslinux_bios: ${CFGROOT}
+ mkdir -p "$${CFGROOT}/boot/bios"
+ cp $(addprefix /usr/lib/syslinux/modules/bios/, menu.c32 libutil.c32) "$${CFGROOT}"/boot/bios/
+ printf 'PATH bios\nINCLUDE bootmenu.cfg\nMENU TITLE Syslinux BIOS\n' >"$${CFGROOT}/boot/syslinux.cfg"
+
+_grub_efi32: ${CFGROOT}
+ mkdir -p "$${CFGROOT}/boot/EFI/BOOT"
+ grub-mkimage -p / -O i386-efi fat part_gpt normal linux all_video >"$${CFGROOT}/boot/EFI/BOOT/BOOTIA32.EFI"
+
+_grub_efi64: ${CFGROOT}
+ mkdir -p "$${CFGROOT}/boot/EFI/BOOT"
+ grub-mkimage -p / -O x86_64-efi fat part_gpt normal linux all_video >"$${CFGROOT}/boot/EFI/BOOT/BOOTX64.EFI"
+
+${CFGROOT}/boot/cmdline.txt: ${CFGROOT}
+ printf 'root=/dev/mmcblk0p2 rootfstype=${fstype} fsck.repair=yes rootwait' >"$@"
+
+_bootloader_raspi: ${CFGROOT} ${CFGROOT}/boot/cmdline.txt
+
+_bootloader_pc: ${CFGROOT} _grub_efi32 _grub_efi64 _syslinux_bios #_syslinux_efi32 _syslinux_efi64
+ printf 'UI menu.c32\nDEFAULT stretch\nTIMEOUT 30\n' >"$${CFGROOT}/boot/bootmenu.cfg"
+ printf 'set timeout=3\ndefault=stretch\n\n' >"$${CFGROOT}/boot/grub.cfg"
+ k="$$(printf ' %s' "$${CFGROOT}/boot/"vmlinuz-*)"; k="$${k##*/}"; \
+ i="$$(printf ' %s' "$${CFGROOT}/boot/"initrd.img-*)"; i="$${i##*/}"; \
+ printf '\nLABEL stretch\n MENU LABEL Debian Stretch\n KERNEL /%s\n INITRD /%s\n APPEND root=LABEL=FSROOT\n' \
+ "$$k" "$$i" >>"$${CFGROOT}/boot/bootmenu.cfg"; \
+ printf '\nLABEL rescue\n MENU LABEL Rescue\n KERNEL /%s\n INITRD /%s\n APPEND root=LABEL=FSROOT init=/bin/sh\n' \
+ "$$k" "$$i" >>"$${CFGROOT}/boot/bootmenu.cfg"; \
+ printf "menuentry 'Debian Stretch' --id 'stretch' {\n linux '/%s' root=LABEL=FSROOT\n initrd '/%s'\n}\n" \
+ "$$k" "$$i" >>"$${CFGROOT}/boot/grub.cfg"; \
+ printf "menuentry 'Rescue' --id 'rescue' {\n linux '/%s' root=LABEL=FSROOT init=/bin/sh\n initrd '/%s'\n}\n" \
+ "$$k" "$$i" >>"$${CFGROOT}/boot/grub.cfg"
+
+_bootloader_iso: ${CFGROOT} ${ISOROOT}
+ mkdir -p "$${ISOROOT}/boot/grub/"
+ cp -L "$${CFGROOT}/vmlinuz" "$${CFGROOT}/initrd.img" "$${ISOROOT}"
+ printf '%s\n' "set timeout=10" "default=buster" \
+ "menuentry 'Debian Buster' --id 'buster' {" \
+ "linux '/vmlinuz' boot=live" "initrd '/initrd.img'" "}" \
+ >"$${ISOROOT}/boot/grub/grub.cfg"
+ -[ -f "$${ISOROOT}/install/initrd.gz" -a -f "$${ISOROOT}/install/linux" ] && \
+ printf '%s\n' "menuentry 'Install Debian' --id 'install' {" \
+ "linux '/install/linux'" "initrd '/install/initrd.gz'" "}" \
+ >>"$${ISOROOT}/boot/grub/grub.cfg"
+
+_efi_mount: ${PBOOT}
+ -umount "efi/"
+ mkdir -p -m 755 "efi/"
+ mount -t vfat -o loop "$${PBOOT}" "efi/"
+
+_efi_umount: _efi_mount
+ umount efi/ && rmdir efi/
+
+.PHONY: _syslinux_mbr _grub_mbr
+
+_syslinux_mbr: ${VOLUME}
+ syslinux -t 2097152 -i "$${VOLUME}"
+ dd conv=notrunc if=/usr/lib/syslinux/mbr/gptmbr.bin of="$${VOLUME}"
+
+_grub_mbr: ${VOLUME}
+ # grub-mkimage -p / -O i386-pc fat part_gpt normal linux all_video |dd conv=notrunc of="$${VOLUME}"
+
+_mbr: _syslinux_mbr # _grub_mbr
+
+_partcopy: ${VOLUME} ${PROOT} ${PBOOT}
+ dd conv=notrunc,sparse bs=1M seek=2 if="$${PBOOT}" of="$${VOLUME}"
+ dd conv=notrunc,sparse bs=1M seek=$$((2 + ${BOOT_MB})) if="$${PROOT}" of="$${VOLUME}"
+
+_mount_root: ${PROOT} ${CFGROOT}
+ mountpoint "$${CFGROOT}" \
+ || mount -t ${fstype} "$${PROOT}" "$${CFGROOT}"
+ chmod 755 "$${CFGROOT}"
+
+_mount_boot: ${PBOOT}
+ mkdir -p -m 755 "$${CFGROOT}/boot"
+ mountpoint "$${CFGROOT}/boot" \
+ || mount -t vfat "$${PBOOT}" "$${CFGROOT}/boot"
+
+ifdef disk
+ _mount_boot: _mount_root
+endif