/usr/share/initramfs-tools/hook-functions for read-only fs on Raspbian

hook-functions

# -*- shell-script -*-

catenate_cpiogz() {
	# Sanity check
	if [ ! -e "${1}" ]; then
		echo "W: catenate_cpiogz: arg1='${1}' does not exist." >&2
		return
	fi

	cat "${1}" >>"${__TMPCPIOGZ}"
}

prepend_earlyinitramfs() {
	# Sanity check
	if [ ! -e "${1}" ]; then
		echo "W: prepend_earlyinitramfs: arg1='${1}' does not exist." >&2
		return
	fi

	cat "${1}" >>"${__TMPEARLYCPIO}"
}

# force_load module [args...]
force_load()
{
	manual_add_modules "$1"
	echo "${@}" >>"${DESTDIR}/conf/modules"
}

# Takes a file containing a list of modules to be added as an
# argument, figures out dependancies, and adds them.
#
# Input file syntax:
#
#   # comment
#   modprobe_module_name [args ...]
#   [...]
#
add_modules_from_file()
{
	# Sanity check
	if [ ! -e "${1}" ]; then
		echo "W: add_modules_from_file: arg1='${1}' does not exist." >&2
		return
	fi

	grep '^[^#]' ${1} | while read module args; do
		[ -n "$module" ] || continue
		force_load "${module}" "${args}"
	done
}

# Add dependent modules + eventual firmware
manual_add_modules()
{
	local prefix kmod options firmware

	if [ $# -eq 0 ]; then
		return
	fi

	modprobe --all --set-version="${version}" --ignore-install --quiet --show-depends "$@" |
	while read prefix kmod options ; do
		if [ "${prefix}" != "insmod" ]; then
			continue
		fi

		# Prune duplicates
		if [ -e "${DESTDIR}/${kmod}" ]; then
			continue
		fi

		install -Dpm 644 "$kmod" "${DESTDIR}/$kmod"
		if [ "${verbose}" = "y" ]; then
			echo "Adding module ${kmod}"
		fi

		# Add required firmware
		for firmware in $(modinfo -k "${version}" -F firmware "${kmod}"); do
			if [ -e "${DESTDIR}/lib/firmware/${firmware}" ] \
			|| [ -e "${DESTDIR}/lib/firmware/${version}/${firmware}" ]; then
				continue
			fi

			# Only print warning for missing fw of loaded module
			# or forced loaded module
			if [ ! -e "/lib/firmware/${firmware}" ] \
			&& [ ! -e "/lib/firmware/${version}/${firmware}" ] ; then
				# Only warn about missing firmware if
				# /proc/modules exists
				if [ ! -e /proc/modules ] ; then
					continue
				fi

				kmod_modname="${kmod##*/}"
				kmod_modname="${kmod_modname%.ko}"
				if grep -q "^$kmod_modname\\>" /proc/modules "${CONFDIR}/modules"; then
					echo "W: Possible missing firmware /lib/firmware/${firmware} for module $(basename ${kmod} .ko)" >&2
				fi
				continue
			fi

			if [ -e "/lib/firmware/${version}/${firmware}" ]; then
				copy_exec "/lib/firmware/${version}/${firmware}"
			else
				copy_exec "/lib/firmware/${firmware}"
			fi
			if [ "${verbose}" = "y" ]; then
				echo "Adding firmware ${firmware}"
			fi
		done
	done
}

# $1 = file to copy to ramdisk
# $2 (optional) Name for the file on the ramdisk
# Location of the image dir is assumed to be $DESTDIR
# We never overwrite the target if it exists.
copy_exec() {
	local src target x nonoptlib
	local libname dirname

	src="${1}"
	target="${2:-$1}"

	[ -f "${src}" ] || return 1

	if [ -d "${DESTDIR}/${target}" ]; then
		# check if already copied
		[ -e "${DESTDIR}/$target/${src##*/}" ] && return 0
	else
		[ -e "${DESTDIR}/$target" ] && return 0
		#FIXME: inst_dir
		mkdir -p "${DESTDIR}/${target%/*}"
	fi

	[ "${verbose}" = "y" ] && echo "Adding binary ${src}"
	cp -pL "${src}" "${DESTDIR}/${target}"

	# Copy the dependant libraries
	for x in $(ldd "${src}" 2>/dev/null | sed -e '
		/\//!d;
		/linux-gate/d;
		/=>/ {s/.*=>[[:blank:]]*\([^[:blank:]]*\).*/\1/};
		s/[[:blank:]]*\([^[:blank:]]*\) (.*)/\1/' 2>/dev/null); do

		# Try to use non-optimised libraries where possible.
		# We assume that all HWCAP libraries will be in tls,
		# sse2, vfp or neon.
		nonoptlib=$(echo "${x}" | sed -e 's#/lib/\([^/]*/\)\?\(tls\|i686\|sse2\|neon\|vfp\).*/\(lib.*\)#/lib/\1\3#')
		nonoptlib=$(echo "${nonoptlib}" | sed -e 's#-linux-gnu/\(tls\|i686\|sse2\|neon\|vfp\).*/\(lib.*\)#-linux-gnu/\2#')

		if [ -e "${nonoptlib}" ]; then
			x="${nonoptlib}"
		fi

		libname=$(basename "${x}")
		dirname=$(dirname "${x}")

		# FIXME inst_lib
		mkdir -p "${DESTDIR}/${dirname}"
		if [ ! -e "${DESTDIR}/${dirname}/${libname}" ]; then
			cp -pL "${x}" "${DESTDIR}/${dirname}"
			[ "${verbose}" = "y" ] && echo "Adding library ${x}" || true
		fi
	done
}

# Copy entire subtrees to the initramfs
copy_modules_dir()
{
	local kmod exclude
	local modules=
	local dir="$1"
	shift

	if ! [ -d "${MODULESDIR}/${dir}" ]; then
		return;
	fi
	if [ "${verbose}" = "y" ]; then
		echo "Copying module directory ${dir}"
		if [ $# -ge 1 ]; then
			echo "(excluding $*)"
		fi
	fi
	while [ $# -ge 1 ]; do
		exclude="${exclude:-} -name $1 -prune -o "
		shift
	done
	for kmod in $(find "${MODULESDIR}/${dir}" ${exclude:-} -name '*.ko' -printf '%f\n'); do
		modules="$modules ${kmod%.ko}"
	done
	manual_add_modules $modules
}

# walk /sys for relevant modules
sys_walk_mod_add()
{
	local driver_path module
	device_path="$1"

	sys_walk_modalias "${device_path}"

	while [ "${device_path}" != "/sys" ]; do
		driver_path="$(readlink -f ${device_path}/driver/module)"
		if [ -e "$driver_path" ]; then
			module="$(basename $(readlink -f $driver_path))"
			if [ -n "${module}" ]; then
				force_load "${module}"
			fi
		fi
		device_path="$(dirname ${device_path})"
	done
}

# walk /sys for relevant modalias
sys_walk_modalias()
{
	local device_path modalias
	device_path="$1"

	while [ "${device_path}" != "/sys" ]; do
		if [ -e "${device_path}/modalias" ]; then
			modalias=$(cat "${device_path}/modalias")
			if [ -n "${modalias}" ]; then
				force_load "${modalias}"
			fi
		fi
		device_path="$(dirname ${device_path})"
	done
}

# Copy all loaded or built-in modules matching the given pattern.
# Pattern mustn't include directory or '.ko' suffix but should use
# '[-_]' to allow for differences in naming between /sys/module and
# modules.builtin.
add_loaded_modules()
{
	local pattern="$1"
	local module
	local builtin=/lib/modules/$(uname -r)/modules.builtin

	for module in /sys/module/$pattern; do
		if [ -d "$module" ]; then
			manual_add_modules $(basename $module)
		fi
	done
	if [ -f $builtin ]; then
		while read module; do
			case "$module" in
			*/$pattern.ko)
				manual_add_modules $(basename $module .ko)
				;;
			esac
		done < $builtin
	fi
}

# find and only copy modules relevant to a mountpoint
dep_add_modules_mount()
{
	local dir block minor dev_node FSTYPE dev_sys_path
	local modules=

	dir="$1"

	# require mounted sysfs
	if [ ! -d /sys/devices/ ]; then
		echo "mkinitramfs: MODULES dep requires mounted sysfs on /sys" >&2
		exit 1
	fi

	# find out block device + fstype
	eval "$( mount | while read -r dev foo mp foo fs opts rest ; do \
		[ "$mp" = "$dir" ] && [ "$fs" != "rootfs" ] \
		&& printf "dev_node='%s'\nFSTYPE='%s'" "$dev" "$fs" \
		&& break; done)"

	# On failure fallback to /proc/mounts if readable
	if [ -z "$dev_node" ] && [ -r /proc/mounts ]; then
		eval "$(while read dev mp fs opts rest ; do \
			[ "$mp" = "$dir" ] && [ "$fs" != "rootfs" ] \
			&& printf "dev_node=$dev\nFSTYPE=$fs"\
			&& break; done < /proc/mounts)"
	fi

	# Only the root mountpoint has to exist; do nothing if any other
	# directory is not a mountpoint.
	if [ "$dir" != / ] && [ -z "$dev_node" ]; then
		return
	fi

	# handle ubifs and return since ubifs is mounted on char devices
	# but most of the commands below only work with block devices.
	if [ "${FSTYPE}" = "ubifs" ]; then
		manual_add_modules "${FSTYPE}"
		return
	fi

	if [ "$dir" = / ] && [ "${dev_node}" = "/dev/root" ] ; then
		if [ -b "${dev_node}" ]; then
			# Match it to the canonical device name by UUID
			dev_node="/dev/disk/by-uuid/"$(blkid -o value -s UUID ${dev_node}) 2>/dev/null
		else
			# Does not exist in our namespace, so look at the
			# kernel command line
			dev_node=
			for arg in $(cat /proc/cmdline); do
				case "$arg" in
				root=*)
					dev_node="${arg#root=}"
					if [ "${dev_node#/dev/}" = "$dev_node" ]; then
						dev_node="/dev/$dev_node"
					fi
					;;
				--)
					break
					;;
				*)
					;;
				esac
			done
		fi
	fi

	# recheck device
	if [ -z "$dev_node" ] || ! dev_node="$(readlink -f ${dev_node})" \
		|| ! [ -b "$dev_node" ]; then
		echo "mkinitramfs: failed to determine device for $dir" >&2
		echo "mkinitramfs: workaround is MODULES=most, check:" >&2
		echo "grep -r MODULES /etc/initramfs-tools/" >&2
		echo "" >&2
		echo "Error please report bug on initramfs-tools" >&2
		echo "Include the output of 'mount' and 'cat /proc/mounts'" >&2
		exit 1
	fi

	# do not trust mount, check superblock
	eval "$(/usr/lib/klibc/bin/fstype ${dev_node})"

	# check that fstype fs recognition
	if [ "${FSTYPE}" = "unknown" ]; then
		FSTYPE=$(blkid -o value -s TYPE "${dev_node}")
		if [  -z "${FSTYPE}" ]; then
			echo "mkinitramfs: unknown fstype on device ${dev_node}" >&2
			echo "mkinitramfs: workaround is MODULES=most" >&2
			echo "Error please report bug on initramfs-tools" >&2
			exit 1
		fi
	fi

	# Add filesystem
	modules="$modules ${FSTYPE}"

	# lvm or luks device
	if [ "${dev_node#/dev/mapper/}" != "${dev_node}" ] \
		|| [ "${dev_node#/dev/dm-}" != "${dev_node}" ]; then
		minor=$((0x$(stat --format "%T" ${dev_node}) % 256))
		block=$(ls -1 /sys/block/dm-${minor}/slaves | head -n 1)
		# lvm on luks or luks on lvm, possibly lvm snapshots
		while [ "${block#dm-}" != "${block}" ]; do
			block=$(ls -1 /sys/block/${block}/slaves | head -n 1)
		done
		# lvm on md or luks on md
		if [ "${block#md}" != "${block}" ]; then
			block=$(sed -ne 's/multipath/[/' -e 's/linear/[/' -e 's/raid[0-9][0-9]*/[/' -e 's/\([hs]d[a-z][a-z]*\)[0-9][0-9]*/\1/g' -e '/^'${block}' :/s/^[^[]*\[ \([^\[]*\)\[.*$/\1/p' </proc/mdstat)
		fi
		# luks or lvm on cciss or ida
		if [ "${block#cciss}" != "${block}" ] \
		|| [ "${block#ida}" != "${block}" ] \
		|| [ "${block#mmcblk}" != "${block}" ] \
		|| [ "${block#nvme}" != "${block}" ]; then
			block="${block%p*}"
		else
			block=${block%%[0-9]*}
		fi
	# md device new naming scheme /dev/md/X
	elif [ "${dev_node#/dev/md/}" != "${dev_node}" ]; then
		dev_node=${dev_node#/dev/md/}
		# strip partion number
		dev_node=${dev_node%%p[0-9]*}
		# drop the partition number only for sdX and hdX devices
		# and keep it for other devices like loop#, dm-# devices
		block=$(sed -ne 's/multipath/[/' -e 's/linear/[/' -e 's/raid[0-9][0-9]*/[/' -e 's/\([hs]d[a-z][a-z]*\)[0-9][0-9]*/\1/g' -e '/^md'$dev_node' :/s/^[^[]*\[ \([^\[]*\)\[.*$/\1/p' </proc/mdstat)
	# md device /dev/mdX
	elif [ "${dev_node#/dev/md}" != "${dev_node}" ]; then
		dev_node=${dev_node#/dev/md}
		# strip partion number
		dev_node=${dev_node%%p[0-9]*}
		# drop the partition number only for sdX and hdX devices
		# and keep it for other devices like loop#, dm-# devices
		block=$(sed -ne 's/multipath/[/' -e 's/linear/[/' -e 's/raid[0-9][0-9]*/[/' -e 's/\([hs]d[a-z][a-z]*\)[0-9][0-9]*/\1/g' -e '/^md'$dev_node' :/s/^[^[]*\[ \([^\[]*\)\[.*$/\1/p' </proc/mdstat)
	# cciss device
	elif [ "${dev_node#/dev/cciss/}" != "${dev_node}" ]; then
		block=${dev_node#/dev/cciss/*}
		block="cciss!${block%p*}"
	# ida device
	elif [ "${dev_node#/dev/ida/}" != "${dev_node}" ]; then
		block=${dev_node#/dev/ida/*}
		block="ida!${block%p*}"
	# loop device /dev/loopX
	elif [ "${dev_node#/dev/loop}" != "${dev_node}" ]; then
		dev_node=${dev_node#/dev/}
		block=$(losetup -a \
			| awk "/${dev_node}/{print substr(\$3, 7, 3); exit}")
	# Xen virtual device /dev/xvdX
	elif [ "${dev_node#/dev/xvd}" != "${dev_node}" ]; then
		block=${dev_node#/dev/}
		# Xen has a mode where only the individual partitions are
		# registered with the kernel as well as the usual full disk
		# with partition table scheme.
		if [ ! -e /sys/block/${block} ] ; then
			block=${block%%[0-9]*}
		fi
	# mmc device /dev/mmcblkXpX
	elif [ "${dev_node#/dev/mmcblk}" != "${dev_node}" ]; then
		block=${dev_node#/dev/}
		block=${block%%p[0-9]*}

	# nbd device /dev/nbdXpX
	elif [ "${dev_node#/dev/nbd}" != "${dev_node}" ]; then
		block=${dev_node#/dev/}
		block=${block%%p[0-9]*}

	# DAC960 - good old mylex raid - device format /dev/rd/cXdXpX
	elif [ "${dev_node#/dev/rd/c}" != "${dev_node}" ]; then
		block="rd!c${dev_node#/dev/rd/c}"
		block=${block%%p[0-9]*}

	# etherd device
	elif [ "${dev_node#/dev/etherd/}" != "${dev_node}" ]; then
		block=${dev_node#/dev/etherd/*}
		block="etherd!${block%p*}"
	# i2o raid device
	elif [ "${dev_node#/dev/i2o/}" != "${dev_node}" ]; then
		block=${dev_node#/dev/i2o/}
		block=${block%%[0-9]*}
		block='i2o!'$block
	# nvme device
	elif [ "${dev_node#/dev/nvme}" != "${dev_node}" ]; then
		block=${dev_node#/dev/}
		block=${block%p*}
	# classical block device
	else
		block=${dev_node#/dev/}
		block=${block%%[0-9]*}
	fi

	# Error out if /sys lack block dev
	if [ -z "${block}" ] || [ ! -e /sys/block/${block} ]; then
		echo "mkinitramfs: for device ${dev_node} missing ${block} /sys/block/ entry" >&2
		echo "mkinitramfs: workaround is MODULES=most" >&2
		echo "mkinitramfs: Error please report the bug" >&2
		exit 1
	fi

	# sys walk ATA
	dev_sys_path=$(readlink -f /sys/block/${block}/device)
	sys_walk_mod_add ${dev_sys_path}

	# sys walk some important device classes
	for class in gpio phy regulator; do
		for device in /sys/class/$class/*; do
			device="$(readlink -f "$device")" \
				&& sys_walk_mod_add "$device"
		done
	done

	# clk, USB-PHY and pinctrl devices are outside the device model (!) so
	# match loaded modules by name
	add_loaded_modules 'clk[-_]*'
	add_loaded_modules 'phy[-_]*'
	add_loaded_modules 'pinctrl[-_]*'

	# catch old-style IDE
	if [ -e /sys/bus/ide/devices/ ]; then
		sys_walk_modalias ${dev_sys_path}
		modules="$modules ide-gd_mod ide-cd"
	fi

	if [ -e /sys/bus/scsi/devices/ ]; then
		modules="$modules sd_mod"
	fi

	if [ -e /sys/bus/mmc/devices/ ]; then
		modules="$modules mmc_block"
	fi

	if [ -e /sys/bus/virtio ] ; then
		modules="$modules virtio_pci virtio_mmio"
	fi

	if [ -e /sys/bus/i2o/devices/ ]; then
		force_load i2o_block
		force_load i2o_config
	fi

	if [ -e /sys/bus/ps3_system_bus/ ]; then
		modules="$modules ps3disk ps3rom ps3-gelic ps3_sys_manager"
	fi

	if [ -e /sys/bus/vio/ ]; then
		modules="$modules sunvnet sunvdc"
	fi

	manual_add_modules $modules
}

dep_add_modules()
{
	dep_add_modules_mount /
	dep_add_modules_mount /usr
}

# The modules "most" classes added per default to the initramfs
auto_add_modules()
{
	local arg
	local modules=

	if [ "$#" -eq 0 ] ; then
		set -- base net ide scsi block ata i2o dasd ieee1394 firewire mmc usb_storage
	fi

	for arg in "$@" ; do
		case "$arg" in
		base)
			modules="$modules ehci-pci ehci-orion ehci-hcd ohci-hcd ohci-pci uhci-hcd usbhid overlay"
			modules="$modules xhci xhci-pci xhci-hcd"
			modules="$modules btrfs ext2 ext3 ext4 ext4dev "
			modules="$modules isofs jfs reiserfs udf xfs"
			modules="$modules nfs nfsv2 nfsv3 nfsv4"
			modules="$modules af_packet atkbd i8042 psmouse"
			modules="$modules virtio_pci virtio_mmio"

			# Include all HID drivers unless we're sure they
			# don't support keyboards.  hid-*ff covers various
			# game controllers with force feedback.
			copy_modules_dir kernel/drivers/hid \
				'hid-*ff.ko' hid-a4tech.ko hid-cypress.ko \
				hid-dr.ko hid-elecom.ko hid-gyration.ko \
				hid-icade.ko hid-kensington.ko hid-kye.ko \
				hid-lcpower.ko hid-magicmouse.ko \
				hid-multitouch.ko hid-ntrig.ko \
				hid-petalynx.ko hid-picolcd.ko hid-pl.ko \
				hid-ps3remote.ko hid-quanta.ko \
				'hid-roccat-ko*.ko' hid-roccat-pyra.ko \
				hid-saitek.ko hid-sensor-hub.ko hid-sony.ko \
				hid-speedlink.ko hid-tivo.ko hid-twinhan.ko \
				hid-uclogic.ko hid-wacom.ko hid-waltop.ko \
				hid-wiimote.ko hid-zydacron.ko

			# Any of these might be needed by other drivers
			copy_modules_dir kernel/drivers/clk
			copy_modules_dir kernel/drivers/gpio
			copy_modules_dir kernel/drivers/phy
			copy_modules_dir kernel/drivers/pinctrl
			copy_modules_dir kernel/drivers/regulator
			copy_modules_dir kernel/drivers/usb/phy
		;;
		net)
			copy_modules_dir kernel/drivers/net \
				appletalk arcnet bonding can dummy.ko \
				hamradio hippi ifb.ko irda macvlan.ko \
				macvtap.ko pcmcia sb1000.ko team tokenring \
				tun.ko usb veth.ko wan wimax wireless \
				xen-netback.ko
		;;
		ide)
			copy_modules_dir kernel/drivers/ide
		;;
		mmc)
			copy_modules_dir kernel/drivers/mmc
		;;
		scsi)
			copy_modules_dir kernel/drivers/scsi
			modules="$modules mptfc mptsas mptscsih mptspi zfcp"
		;;
		ata)
			copy_modules_dir kernel/drivers/ata
		;;
		block)
			copy_modules_dir kernel/drivers/block
			copy_modules_dir kernel/drivers/nvme
		;;
		ubi)
			modules="$modules deflate zlib lzo ubi ubifs"
		;;
		ieee1394)
			modules="$modules ohci1394 sbp2"
		;;
		firewire)
			modules="$modules firewire-ohci firewire-sbp2"
		;;
		i2o)
			modules="$modules i2o_block"
		;;
		dasd)
			modules="$modules dasd_diag_mod dasd_eckd_mod dasd_fba_mod"
		;;
		usb_storage)
			copy_modules_dir kernel/drivers/usb/storage
		;;
		esac
	done

	manual_add_modules $modules
}

# 'depmod' only looks at symbol dependencies; there is no way for
# modules to declare explicit dependencies through module information,
# so dependencies on e.g. crypto providers are hidden.  Until this is
# fixed, we need to handle those hidden dependencies.
hidden_dep_add_modules()
{
	local modules=
	for dep in "lib/libcrc32c crc32c" \
			"fs/ubifs/ubifs deflate zlib lzo" \
			"fs/btrfs/btrfs crc32c"; do
		set -- $dep
		if [ -f "${DESTDIR}/lib/modules/${version}/kernel/$1.ko" ]; then
			shift
			modules="$modules $@"
		fi
	done
	manual_add_modules $modules
}

# mkinitramfs help message
usage()
{
	cat >&2 << EOF

Usage: ${0} [OPTION]... -o outfile [version]

Options:
  -c compress	Override COMPRESS setting in initramfs.conf.
  -d confdir	Specify an alternative configuration directory.
  -k		Keep temporary directory used to make the image.
  -o outfile	Write to outfile.
  -r root	Override ROOT setting in initramfs.conf.

See mkinitramfs(8) for further details.
EOF
	exit 1

}

# Find the source for a script file.  This is needed to work around
# temporary directories mounted with the noexec option.  The source
# will be on / or /usr which must be executable.
get_source()
{
	if [ -z "$scriptdir" ]; then
		echo "${initdir}/$1"
	elif [ -f "${CONFDIR}${scriptdir}/$1" ]; then
		echo "${CONFDIR}${scriptdir}/$1"
	else
		echo "/usr/share/initramfs-tools${scriptdir}/$1"
	fi
}

set_initlist()
{
	unset initlist
	for si_x in ${initdir}/*; do
		# skip empty dirs without warning
		[ "${si_x}" = "${initdir}/*" ] && return

		# only allow variable name chars
		case ${si_x#${initdir}/} in
		*[![:alnum:]\._-]*)
			[ "${verbose}" = "y" ] \
			&& echo "$si_x ignored: not alphanumeric or '_' file" >&2
			continue
			;;
		esac

		# skip directories
		if [ -d ${si_x} ]; then
			[ "${verbose}" = "y" ] \
			&& echo "$si_x ignored: a directory" >&2
			continue
		fi

		si_x="$(get_source "${si_x#${initdir}/}")"

		# skip non executable scripts
		if [ ! -x ${si_x} ]; then
			[ "${verbose}" = "y" ] \
			&& echo "$si_x ignored: not executable" >&2
			continue
		fi

		# skip bad syntax
		if ! sh -n ${si_x} ; then
			[ "${verbose}" = "y" ] \
			&& echo "$si_x ignored: bad syntax" >&2
			continue
		fi

		initlist="${initlist:-} ${si_x##*/}"
	done
}

get_prereq_pairs()
{
	set_initlist
	for gp_x in ${initlist:-}; do
		echo ${gp_x} ${gp_x}
		gp_src="$(get_source $gp_x)"
		prereqs=$("${gp_src}" prereqs)
		for prereq in ${prereqs}; do
			echo ${prereq} ${gp_x}
		done
	done
}

# cache boot scripts order
cache_run_scripts()
{
	DESTDIR=${1}
	scriptdir=${2}
	initdir=${DESTDIR}${scriptdir}
	[ ! -d ${initdir} ] && return

	> ${initdir}/ORDER
	runlist=$(get_prereq_pairs | tsort)
	for crs_x in ${runlist}; do
		[ -f ${initdir}/${crs_x} ] || continue
		echo "${scriptdir}/${crs_x} \"\$@\"" >> ${initdir}/ORDER
		echo "[ -e /conf/param.conf ] && . /conf/param.conf" >> ${initdir}/ORDER
	done
}

call_scripts()
{
	set -e
	for cs_x in ${runlist}; do
		[ -f ${initdir}/${cs_x} ] || continue
		# mkinitramfs verbose output
		if [ "${verbose}" = "y" ]; then
			echo "Calling hook ${cs_x}"
		fi
		${initdir}/${cs_x} && ec=$? || ec=$?
		# allow hooks to abort build:
		if [ "$ec" -ne 0 ]; then
			echo "E: ${initdir}/${cs_x} failed with return $ec."
			# only errexit on mkinitramfs
			[ -n "${version}" ] && exit $ec
		fi
		# allow boot scripts to modify exported boot parameters
		if [ -e /conf/param.conf ]; then
			. /conf/param.conf
		fi
	done
	set +e
}

run_scripts()
{
	scriptdir=${2:-}
	initdir=${1}
	[ ! -d ${initdir} ] && return

	runlist=$(get_prereq_pairs | tsort)
	call_scripts $scriptdir
}