ifdef imagesize
  ROOT_MB := $(shell printf '%i\n' "$$(( ${imagesize} - ${BOOT_MB} - 3 ))")
endif

PACKAGES += btrfs-progs bzip2 ca-certificates cron deborphan dnsutils file firmware-linux-free gzip htop ifupdown iputils-ping irqbalance isc-dhcp-client less make net-tools nmap ntpdate openssh-client pciutils psmisc rsync sshfs sudo traceroute unzip vim wget wireless-tools wpasupplicant xz-utils zip

ifdef packages
  PACKAGES += $(subst ${comma_},${space_},${packages})
endif

export DEBCONF RPICONFIG

define DEBCONF :=
${DEBCONF}

keyboard-configuration	keyboard-configuration/model	select	Generic 105-key (Intl) PC
keyboard-configuration	keyboard-configuration/variant	select	English (US) - English (Macintosh)

console-setup	console-setup/charmap47	select	UTF-8
console-setup	console-setup/codeset47	select	# Latin1 and Latin5 - western Europe and Turkic languages
endef

ifndef rpivmem
  rpivmem := 128
endif

define RPICONFIG :=
${RPICONFIG}

dtoverlay=vc4-fkms-v3d,cma-${rpivmem}
endef

.PHONY: _debconf_selections _raspberry_config _keyboard
_install: _debconf_selections
_debconf_selections: ${SYSROOT}
	printf '%s\n' "$${DEBCONF}" |chroot "$${SYSROOT}" debconf-set-selections

ifdef keyboard
  _config: _keyboard
endif
_keyboard: ${CFGROOT}
	-sed -Ei 's;^XKBLAYOUT=.*$$;XKBLAYOUT="${keyboard}";;' "$${CFGROOT}/etc/default/keyboard"

ifdef raspi
  _config: _raspberry_config _raspberry_initrd
endif

_raspberry_config: ${CFGROOT}
	printf '%s\n' "$${RPICONFIG}" >>"$${CFGROOT}/boot/config.txt"

_raspberry_initrd: ${CFGROOT}
	printf '${fstype}\n' >>"$${CFGROOT}/etc/initramfs-tools/modules"
	k="$$(printf '%s\n' "$${CFGROOT}"/lib/modules/* |sed 's;^.*/;;; /-/d')"; \
	[ "${kernel}" ] && k="${kernel}"; \
	chroot $${CFGROOT} update-initramfs -c -k "$${k##*/}"; \
	printf 'initramfs initrd.img-%s\n' "$${k##*/}" >>"$${CFGROOT}/boot/config.txt"

.PHONY: _timezone _locales

ifdef timezone
  export timezone
  PACKAGES += tzdata
  _config: _timezone
endif

ifdef locales
  PACKAGES += locales
  _config: _locales
endif

_timezone: ${CFGROOT}
	printf '%s\n' "$${timezone}" >"$${CFGROOT}/etc/timezone"
	ln -sf /usr/share/zoneinfo/"$${timezone}" "$${CFGROOT}/etc/localtime"

_locales: ${CFGROOT}
	for l in $(subst ${comma_},${space_},${locales}); do \
		printf '%s %s\n' "$${l}" "$${l#*.}"; \
	done >"$${CFGROOT}/etc/locale.gen"
	printf 'LANG=%s\n' "$(firstword $(subst ${comma_},${space_},${locales}))" >"$${CFGROOT}/etc/default/locale"
	chroot "$${CFGROOT}" locale-gen

.PHONY: _rootpass _users _hostname

ifdef rootpass
  export rootpass
  _config: _rootpass
endif

ifdef rootkey
  export rootkey
  _config: _rootkey
endif

ifdef users
  _config: _users
endif

ifdef hostname
  export hostname
  _config: _hostname
endif

_rootpass: ${CFGROOT}
	chroot "$${CFGROOT}" usermod -p "$$(openssl passwd "$${rootpass}")" root

${rootkey}.pub:
	[ -f "$@" ] || ssh-keygen -N '' -f "$${rootkey}"

_rootkey: ${CFGROOT} ${rootkey}.pub
	mkdir -pm 700 "$${CFGROOT}/root/.ssh/"
	cp "$${rootkey}.pub" "$${CFGROOT}/root/.ssh/authorized_keys"

_users: ${CFGROOT}
	for u in $(subst ${comma_},${space_},${users}); do \
		chroot "$${CFGROOT}" useradd -s /bin/bash -p "$$(openssl passwd "")" "$$u"; \
	done

_hostname: ${CFGROOT}
	printf '%s\n' "$${hostname}" >"$${CFGROOT}/etc/hostname"
	sed -Ei "s;^127\.0\.0\.1.*$$;&	$${hostname};" "$${CFGROOT}/etc/hosts"

_timeouts: ${CFGROOT}
	printf '%s\n' DefaultTimeoutStartSec=10s DefaultTimeoutStopSec=10s >>"${CFGROOT}/etc/systemd/system.conf"


.PHONY: _systemd_timeout
_config: _systemd_timeout
_systemd_timeout: ${CFGROOT}
	mkdir -p "$${CFGROOT}/etc/systemd"
	printf 'DefaultTimeout%sSec=%s\n' Start 10s Stop 10s >>"$${CFGROOT}/etc/systemd/system.conf"

ifdef wifi
  _config: ${CFGROOT}/etc/network/interfaces.d/wifi
  ifdef wifipass
    export wifi wifipass
    ${CFGROOT}/etc/network/interfaces.d/wifi: ${CFGROOT}
	printf 'auto wlan0\nallow-hotplug wlan0\n\niface wlan0 inet dhcp\n' >$@
	printf '  wpa-ssid "%s"\n  wpa-psk "%s"\n' "$$wifi" "$$wifipass" >>$@
  else
    export wifi
    ${CFGROOT}/etc/network/interfaces.d/wifi: ${CFGROOT}
	printf 'auto wlan0\nallow-hotplug wlan0\n\niface wlan0 inet dhcp\n' >$@
	printf '  wireless-essid "%s"\n' "$$wifi" >>$@
  endif
endif

.PHONY: _fstab

ifdef _fstab
  _config: ${CFGROOT}/etc/fstab
  export _fstab

else
  ifdef fsuuid
    define _fstab :=
UUID=${fsuuid}	/		btrfs	auto,rw,subvol=${release}	0 0
UUID=${fsuuid}	/home		btrfs	auto,nofail,rw,subvol=home	0 0
UUID=${fsuuid}	/mnt/fsroot	btrfs	auto,nofail,rw			0 0
LABEL=SWAP	swap		swap	auto,nofail,sw			0 0
LABEL=EFIBOOT	/boot/efi	vfat	auto,nofail,ro			0 0
endef
    _config: ${CFGROOT}/etc/fstab
    export _fstab

  endif
endif

${CFGROOT}/etc/fstab: ${CFGROOT}
	printf '%s' "$${_fstab}" >"$@"


_config: ${CFGROOT}/etc/sysctl.d/quiet_console

${CFGROOT}/etc/sysctl.d/quiet_console: ${CFGROOT}
	printf '%s\n' "kernel.printk=3 4 1 7" >"$@"