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Filename : functions
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# -*- shell-script -*-
# shellcheck shell=sh

_log_msg()
{
	if [ "${quiet?}" = "y" ]; then return; fi
	# shellcheck disable=SC2059
	printf "$@"
	return 0 # Prevents error carry over in case of unavailable console
}

log_success_msg()
{
	_log_msg "Success: %s\\n" "$*"
}

log_failure_msg()
{
	_log_msg "Failure: %s\\n" "$*"
}

log_warning_msg()
{
	_log_msg "Warning: %s\\n" "$*"
}

log_begin_msg()
{
	_log_msg "Begin: %s ... " "$*"
}

log_end_msg()
{
	_log_msg "done.\\n"
}

# Add failure hook
add_mountroot_fail_hook()
{
	# DEPRECATED; this definition remains as a stub but any packages
	# calling this function should be revised to remove references to it
	return 0
}

panic()
{
	local console rest IFS

	if command -v chvt >/dev/null 2>&1; then
		chvt 1
	fi

	echo "$@"

	# The panic= parameter implies we should disallow console access
	if [ -n "${panic?}" ]; then
		delay=
		case "${panic?}" in
		-*[![:digit:].]*)	# invalid: wait forever
			;;
		-*)			# timeout < 0: reboot immediately
			delay=0
			;;
		0 | *[![:digit:].]*)	# timeout = 0 or invalid: wait forever
			;;
		*)			# timeout > 0: seconds before rebooting
			delay="${panic}"
			;;
		esac
		if [ -n "${delay}" ]; then
			echo "Rebooting automatically due to panic= boot argument"
			sleep "${delay}"
			reboot -f
		else
			echo "Halting automatically due to panic= boot argument"
			halt -f
		fi
		exit  # in case reboot fails, force kernel panic
	fi

	run_scripts /scripts/panic

	# Try to use setsid, which will enable job control in the shell
	# and paging in more
	if command -v setsid >/dev/null 2>&1; then
		unset IFS
		read -r console rest </proc/consoles
		if [ "${console}" = "tty0" ]; then
			# Need to choose a specific VT
			console="tty1"
		fi
		# We don't have 'setsid -c' so we need to setsid, open
		# the tty, and finally exec an interactive shell
		REASON="$*" PS1='(initramfs) ' setsid sh -c "exec sh -i <>/dev/${console} 1>&0 2>&1"
	else
		REASON="$*" PS1='(initramfs) ' sh -i </dev/console >/dev/console 2>&1
	fi
}

maybe_break()
{
	case ",${break?}," in
	*,$1,*)
		if [ "$1" = "top" ]; then
			# udev is not yet running, so load keyboard drivers
			if [ "${quiet}" = "y" ]; then
				opts="-q"
			else
				opts="-v"
			fi
			/sbin/modprobe ${opts} -a i8042 atkbd ehci-pci ehci-orion \
				 ehci-hcd ohci-hcd ohci-pci uhci-hcd usbhid xhci \
				 xhci-pci xhci-hcd
			sleep 2
			for modalias in /sys/bus/hid/devices/*/modalias; do
				if [ -f "${modalias}" ]; then
					/sbin/modprobe ${opts} -b "$(cat "${modalias}")"
				fi
			done
		fi
		panic "Spawning shell within the initramfs"
		;;
	esac
}

# For boot time only; this is overridden at build time in hook-functions
run_scripts()
{
	initdir=${1}
	[ ! -d "${initdir}" ] && return

	shift
	. "${initdir}/ORDER"
}

# Load custom modules first
load_modules()
{
	if [ -e /conf/modules ]; then
		while read -r m; do
			# Skip empty lines
			if [ -z "$m" ];  then
				continue
			fi
			# Skip comments - d?ash removes whitespace prefix
			com=$(printf "%.1s" "${m}")
			if [ "$com" = "#" ]; then
				continue
			fi
			# shellcheck disable=SC2086
			/sbin/modprobe $m
		done < /conf/modules
	fi
}

_uptime() {
	local uptime
	uptime="$(cat /proc/uptime)"
	uptime="${uptime%%[. ]*}"
	echo "$uptime"
}

time_elapsed() {
	# shellcheck disable=SC2154
	if [ -z "$starttime" ]; then
		log_failure_msg "time_elapsed() called before \$starttime initialized"
		echo 0
	fi
	local delta
	delta="$(_uptime)"
	delta=$((delta - starttime))
	echo "$delta"
}

# lilo compatibility
parse_numeric() {
	case $1 in
	*:*)
		# Does it match /[0-9]*:[0-9]*/?
		minor=${1#*:}
		major=${1%:*}
		case $major$minor in
		*[!0-9]*)
			# No.
			return
			;;
		esac
		;;
	"" | *[!A-Fa-f0-9]*)
		# "", "/*", etc.
		return
		;;
	*)
		# [A-Fa-f0-9]*
		value=$(( 0x${1} ))
		minor=$(( (value & 0xff) | (value >> 12) & 0xfff00 ))
		major=$(( (value >> 8) & 0xfff ))
		;;
	esac

	# shellcheck disable=SC2034
	ROOT="/dev/block/${major}:${minor}"
}

# Parameter: device node to check
# Echos fstype to stdout
# Return value: indicates if an fs could be recognized
get_fstype ()
{
	local FS FSTYPE
	FS="${1}"

	FSTYPE=$(blkid -o value -s TYPE "${FS}") || return
	echo "${FSTYPE}"
	return 0
}

_set_netdev_from_ip_param()
{
	# If the ip= parameter is present and specifies a device, use
	# that in preference to any device name we already have
	local rc=1
	local IFS=:
	set -f
	# shellcheck disable=SC2086
	set -- ${IP}
	set +f
	if [ -n "$6" ]; then
		DEVICE="$6"
		rc=0
	fi
	case "$IP6" in
		""|on|dhcp|any|none|off)
			;;
		*)
			DEVICE6="$IP6"
			rc=0
			;;
	esac
	return $rc
}

_set_netdev_from_hw_address()
{
	local want_address="$1"
	local device
	for device in /sys/class/net/*; do
		if [ -f "$device/address" ] &&
		   [ "$(cat "$device/address")" = "$want_address" ]; then
			DEVICE="${device##*/}"
			DEVICE6="${device##*/}"
			return 0
		fi
	done
	return 1
}

_usable_netdev_exists()
{
	# Look for a device with IFF_LOOPBACK clear and (IFF_BROADCAST
	# or IFF_POINTTOPOINT) set.  This is the same test the kernel
	# and ipconfig apply to find a device.
	local device
	local flags
	for device in /sys/class/net/*; do
		if [ -f "${device}/flags" ]; then
			flags="$(cat "${device}/flags")"
			if [ "$((flags & 8))" -eq 0 ] &&
			   [ "$((flags & 0x12))" -ne 0 ]; then
				return 0
			fi
		fi
	done
	return 1
}

_update_ip_param()
{
	# If the ip= parameter is present, and is a colon-separated list,
	# but does not specify a device, substitute in the device name
	# we have
	local IFS=:
	set -f
	# shellcheck disable=SC2086
	set -- ${IP}
	set +f
	if [ -z "$6" ] && [ $# -ge 2 ] && [ -n "${DEVICE}" ]; then
		IP="$1:$2:$3:$4:$5:${DEVICE}"
		shift 6 || shift $#
		IP="${IP}:$*"
	fi
}

configure_networking()
{
	local netdev_desc

	# The order of precedence here is:
	# 1. Device specified by ip= kernel parameter
	# 2. Device matching MAC specified by BOOTIF= kernel parameter
	# 3. Build-time DEVICE variable
	# In case 2 we only discover the device name while waiting
	# for a device.
	if _set_netdev_from_ip_param; then
		if [ -n "${DEVICE}" ] && [ -n "${DEVICE6}" ]; then
			netdev_desc="${DEVICE} and ${DEVICE6}"
		else
			netdev_desc="${DEVICE:-$DEVICE6}"
		fi
	elif [ -n "${BOOTIF}" ]; then
		# pxelinux sets BOOTIF to a value based on the mac address of the
		# network card used to PXE boot
		# pxelinux sets BOOTIF to 01-$mac_address

		# strip off the leading "01-", which isn't part of the mac
		# address
		temp_mac=${BOOTIF#*-}

		# convert to typical mac address format by replacing "-" with ":"
		bootif_mac=""
		IFS='-'
		for x in $temp_mac ; do
			if [ -z "$bootif_mac" ]; then
				bootif_mac="$x"
			else
				bootif_mac="$bootif_mac:$x"
			fi
		done
		unset IFS

		_set_netdev_from_hw_address "${bootif_mac}"
		netdev_desc="device with address ${bootif_mac}"
	elif [ -n "${DEVICE}${DEVICE6}" ]; then
		if [ -n "${DEVICE}" ] && [ -n "${DEVICE6}" ]; then
			netdev_desc="${DEVICE} and ${DEVICE6}"
		else
			netdev_desc="${DEVICE:-$DEVICE6}"
		fi
	else
		netdev_desc="any network device"
	fi

	for v in $VLAN; do
		VLAN_LINK="$VLAN_LINK ${v##*:}"
		VLAN_NAMES="$VLAN_NAMES ${v%:*}"
	done

	# activate non-autoconfigured s390x devices
	for dev in $DEVICE $DEVICE6 $VLAN_LINK; do
		# do not chzdev $dev if it is a not-yet-created vlan interface
		for vlan_name in $VLAN_NAMES; do
			if [ "$dev" = "$vlan_name" ]; then
				continue 2
			fi
		done
		case ${dev} in
		enc*)
			zdev=${dev#enc}
			chzdev -e "$zdev" || true
			;;
		esac
	done

	for v in $VLAN; do
		vlink=${v##*:}
		vname=${v%:*}
		vid=${vname#*.}
		ip link set up dev "$vlink"
		ip link add name "$vname" link "$vlink" type vlan id "$vid"
	done

	local netdevwait=180
	log_begin_msg "Waiting up to ${netdevwait} secs for ${netdev_desc} to become available"
	while true; do
		if [ "$(time_elapsed)" -ge "$netdevwait" ]; then
			log_failure_msg "Network device did not appear in time"
			break
		fi
		if [ -n "${DEVICE}" ]; then
			[ -e "/sys/class/net/${DEVICE}" ] && break
		elif [ -n "${bootif_mac}" ]; then
			_set_netdev_from_hw_address "${bootif_mac}" && break
		else
			_usable_netdev_exists && break
		fi
		sleep 1
	done
	log_end_msg

	_update_ip_param

	wait_for_udev 10

	# support ip options see linux sources
	# Documentation/filesystems/nfs/nfsroot.txt
	# Documentation/frv/booting.txt

	for ROUNDTTT in 30 60 90 120; do
		local iter_entry_time iter_exit_time

		iter_entry_time=$(time_elapsed)

		case ${IP} in
		none|done|off)
			# Do nothing
			IP="done"
			;;
		""|on|any|dhcp|bootp|both)
			dhcpcd -1KL -t $ROUNDTTT -4 ${DEVICE:+"${DEVICE}"}
			;;
		*)
			ipconfig -t ${ROUNDTTT} -d "$IP"
			;;
		esac

		case ${IP6} in
		""|none|done|off)
			# Do nothing
			IP6="done"
			;;
		*)
			# check the content of IP6 and if it is not on/dhcp/any use it as
			# a device name. Otherwise all devices will be tried (unless
			# BOOTIF was set, see above).
			case "${IP6}" in
			on|dhcp|any)
				;;
			*)
				DEVICE6="$IP6" ;;
			esac

			dhcpcd -1KL -t $ROUNDTTT -6 ${DEVICE6:+"${DEVICE6}"}
			;;
		esac

		# The NIC is to be configured if this file does not exist.
		# Ip-Config tries to create this file and when it succeds
		# creating the file, ipconfig is not run again.
		if [ -z "${DEVICE}" ] && ls /run/net-*.conf >/dev/null 2>&1 || [ -e /run/net-"${DEVICE}".conf ]; then
			IP="done"
		fi
		if [ -z "${DEVICE6}" ] && ls /run/net6-*.conf >/dev/null 2>&1 || [ -e /run/net6-"${DEVICE6}".conf ]; then
			IP6="done"
		fi

		# if we've reached a point where both IP and IP6 are "done",
		# then we're finished with network configuration.
		if [ "$IP" = "done" ] && [ "$IP6" = "done" ]; then
			break
		fi

		iter_exit_time=$(time_elapsed)

		if [ $((iter_exit_time - iter_entry_time)) -le $ROUNDTTT ]; then
			echo "Sleeping $((ROUNDTTT - iter_exit_time + iter_entry_time)) seconds before retrying getting a DHCP lease"
			sleep $((ROUNDTTT - iter_exit_time + iter_entry_time))
		fi
	done

	# source ipconfig output for either $DEVICE or the first one.
	# If the user is booting with only IPv6, then DEVICE may be set,
	# but no IPv4 conf files exist.
	for conf in /run/"net-$DEVICE.conf" /run/net-*.conf; do
		if [ -e "$conf" ]; then
			# source specific bootdevice
			. "$conf"
			break
		fi
	done

	netinfo_to_resolv_conf /etc/resolv.conf \
		/run/"net-${DEVICE}.conf" /run/net-*.conf /run/net6-*.conf
	netinfo_to_netplan /run/netplan \
		/run/"net-${DEVICE}.conf" /run/net-*.conf /run/net6-*.conf
}

netinfo_to_resolv_conf() {
	# netinfo_to_resolv_conf(output, files)
	# write resolv_conf from /run/net-<device> style files.
	if [ "${_in_subshell:-0}" = "0" ]; then
		# subshell to avoid modification of variables by '.'
		# shellcheck disable=SC2030
		( _in_subshell=1; netinfo_to_resolv_conf "$@" )
		return
	fi
	local output="$1" search="" ns="" f="" n=""
	shift
	for f in "$@"; do
		[ -f "$f" ] || continue
		unset IPV4DNS0 IPV4DNS1 IPV6DNS0 IPV6DNS1
		unset DOMAINSEARCH IPV6DOMAINSEARCH
		. "$f" || { echo "WARN: failed '. \"$f\"'" 1>&2; return 1; }
		for n in "${IPV4DNS0}" "${IPV4DNS1}" \
			"${IPV6DNS0}" "${IPV6DNS1}"; do
			if [ -z "$n" ] || [ "$n" = "0.0.0.0" ]; then
				continue
			fi
			# skip if 'n' already in list.
			case " ${ns} " in
				*\ $n\ *) continue;;
			esac
			ns="${ns} ${n}"
		done
		for n in "${DOMAINSEARCH}" "${IPV6DOMAINSEARCH}"; do
			[ -n "$n" ] || continue
			# skip if already in search.
			case " ${search}" in
				*\ $n\ *) continue;;
			esac
			search="$search $n"
		done
		search=${search# }
		ns=${ns# }
	done

	local rconf="" CR="
"
	for n in ${ns}; do
		rconf="${rconf}nameserver $n${CR}"
	done
	if [ -n "${search}" ]; then
		rconf="${rconf}search ${search}${CR}"
	fi
	if [ -z "$rconf" ]; then
		echo "no search or nameservers found in $*" 1>&2
	fi
	if [ "$rconf" = "-" ]; then
		printf "%s" "$rconf"
	else
		printf "%s" "$rconf" > "$output"
	fi
}

mask2cidr() {
	# https://forum.openwrt.org/viewtopic.php?pid=220781#p220781
	# Assumes there's no "255." after a non-255 byte in the mask
	local x="${1##*255.}"
	set -- 0^^^128^192^224^240^248^252^254^ $(( (${#1} - ${#x})*2 )) "${x%%.*}"
	x=${1%%"$3"*}
	echo $(( $2 + (${#x}/4) ))
}

_declare_sh_append_var() {
	# append_var(name, skip, strings)
	# write a declaration of name that will append to any existing
	local name="$1" skip="$2" add="" n=""
	shift 2
	for n in "$@"; do
		if [ -z "$n" ] || [ "$n" = "$skip" ]; then
			continue
		fi
		add="$add $n"
	done
	add=${add# }
	[ -n "$add" ] || return 0
	echo "$name=\"\${${name}:+\${${name}} }${add}\""
}

_declare_ip_info() {
	# declare_ip_info(version, proto, address, netmask, gateway)
	local version="$1" proto="$2" address="$3" netmask="$4" gateway="$5"
	local netprefix=""
	case $proto in
		dhcp|dhcp4|dhcp6)
			echo "dhcp${version}=true"
			;;
		none)
			if [ -n "$address" ]; then
				netprefix=$netmask
				if [ "$version" = "4" ]; then
					netprefix=$(mask2cidr "$netmask")
				fi
				_declare_sh_append_var addresses "" "$address/$netprefix"
			fi
			if [ -n "$gateway" ]; then
				echo "gateway${version}=$gateway"
			fi
			;;
	esac
}

_render_netplan() {
	# write a netplan stanza for the given device.
	local name="$1" mac="$2" dhcp4="$3" dhcp6="$4" addrs="$5" \
		gateway4="$6" gateway6="$7" ns_addrs="$8" ns_search="$9" \
		vlink="${10}" vname="${11}" vid="${12}"
	local n found=""
	if [ -n "$vlink" ]; then
		name=$vlink
	fi
	echo "network:"
	echo "  version: 2"
	echo "  ethernets:"
	echo "    $name:"
	if [ -n "$mac" ] && grep -q net.ifnames=0 /proc/cmdline 2>/dev/null; then
		echo "      match:"
		echo "        macaddress: \"$mac\""
		echo "      set-name: $name"
	elif [ -n "$vname" ]; then
		echo "      {}"
	fi
	if [ -n "$vname" ]; then
		echo "  vlans:"
		echo "    $vname:"
		echo "      id: $vid"
		echo "      link: $name"
	fi
	if [ -n "$dhcp4" ]; then
		echo "      dhcp4: $dhcp4"
		echo "      dhcp-identifier: mac"
	fi
	if [ -n "$dhcp6" ]; then
		echo "      dhcp6: $dhcp6"
	fi
	if [ -n "$dhcp4$dhcp6" ]; then
		echo "      critical: true"
	fi
	if [ -n "$addrs" ]; then
		echo "      addresses:"
		found=","
		for n in $addrs; do
			# remove dups
			[ "${found#*,"$n",}" = "${found}" ] || continue
			found="${found}$n,"
			echo "        - \"$n\""
		done
	fi
	if [ -n "$gateway4" ]; then
		echo "      gateway4: \"$gateway4\""
	fi
	if [ -n "$gateway6" ]; then
		echo "      gateway6: \"$gateway6\""
	fi

	if [ -n "$ns_addrs" ]; then
		local alist="[" slist=""
		for n in $ns_addrs; do
			# do not put in duplicates
			[ "${alist#*\""$n"\"}" = "$alist" ] || continue
			alist="${alist}\"$n\", ";
		done
		alist="${alist%, }]"

		if [ -n "$ns_search" ]; then
			slist="["
			for n in ${ns_search}; do
				# do not put in duplicates
				[ "${slist#*\""$n"\"}" = "$slist" ] || continue
				slist="${slist}\"$n\", ";
			done
			slist="${slist%, }]"
		fi
		echo "      nameservers:"
		echo "        addresses: $alist"
		if [ -n "$slist" ]; then
			echo "        search: $slist"
		fi
	fi
}

netinfo_to_netplan() {
	# read /run/net-* files write netplan config.
	# shellcheck disable=SC2031
	if [ "${_in_subshell:-0}" = "0" ]; then
		# subshell to avoid modification of variables by '.'
		( _in_subshell=1; netinfo_to_netplan "$@" )
		return
	fi
	local out_d="$1" tmpd
	if command -v mktemp >/dev/null 2>&1; then
		tmpd=$(mktemp -d "${TMPDIR:-/tmp}/${0##*/}.XXXXXX")
	else
		tmpd="${TMPDIR:-/tmp}/${0##*/}.niinfo.$$"
		mkdir -p "$tmpd" || return
	fi

	local devices="" mac=""
	# we go through all the files presented and create per-device files in
	# a tmpdir that are shell sourceable and closer to the netplan that
	# we want to render. Then render those to netplan stanzas.
	for f in "$@"; do
		[ -f "$f" ] || continue
		unset DEVICE DEVICE6 PROTO IPV6PROTO
		unset IPV6ADDR IPV6NETMASK IPV6GATEWAY
		unset IPV4ADDR IPV4NETMASK IPV4GATEWAY
		. "$f" || { echo "WARN: failed '. \"$f\"'" 1>&2; return 1; }
		local name=""
		name=${DEVICE:-${DEVICE6}}
		[ -n "$name" ] || {
			echo "WARN: $f did not define DEVICE or DEVICE6" 1>&2;
			return 1;
		}
		case " ${devices} " in
			*\ ${name}\ *) :;;
			*) devices="${devices} ${name}"
		esac
		if [ ! -e "$tmpd/$name" ] \
		   && [ -r "/sys/class/net/$name/address" ]
		then
			read -r mac < /sys/class/net/"$name"/address &&
				echo "macaddress=$mac" > "$tmpd/$name"
		fi

		{
		for v in $VLAN; do
			vlink=${v##*:}
			vname=${v%:*}
			vid=${vname#*.}
			if [ "$name" = "$vname" ]; then
				echo "vlink=$vlink"
				echo "vname=$vname"
				echo "vid=$vid"
				break
			fi
		done
		if [ -n "$DEVICE" ]; then
			# shellcheck disable=SC2153
			_declare_ip_info 4 "$PROTO" "$IPV4ADDR" "$IPV4NETMASK" "$IPV4GATEWAY"
		elif [ -n "$DEVICE6" ]; then
			_declare_ip_info 6 "$IPV6PROTO" "$IPV6ADDR" "$IPV6NETMASK" \
				"$IPV6GATEWAY"
		fi
		_declare_sh_append_var ns_addresses "0.0.0.0" \
			"${IPV4DNS0}" "${IPV4DNS1}" "${IPV6DNS0}" "${IPV6DNS1}"
		_declare_sh_append_var ns_search "" "$DOMAINSEARCH" "$IPV6DOMAINSEARCH"
		} >> "$tmpd/$name"
	done

	[ -d "$out_d" ] || mkdir -p "$out_d" ||
		{ echo "WARN: failed mkdir $out_d"; return 1; }

	for name in $devices; do
		local macaddress="" dhcp4="" dhcp6="" addresses=""
		local gateway4="" gateway6="" ns_addresses="" ns_search=""
		local vlink="" vname="" vid=""
		. "$tmpd/$name"
		_render_netplan "$name" "$macaddress" "$dhcp4" "$dhcp6" "$addresses" \
			"$gateway4" "$gateway6" "$ns_addresses" "$ns_search" \
			"$vlink" "$vname" "$vid" \
			> "${out_d}/$name.yaml"
	done
	rm -Rf "$tmpd"
}

# Wait for queued kernel/udev events
wait_for_udev()
{
	command -v udevadm >/dev/null 2>&1 || return 0
	udevadm settle ${1:+--timeout=$1}
}

# Find a specific fstab entry
# $1=mountpoint
# $2=fstype (optional)
# returns 0 on success, 1 on failure (not found or no fstab)
read_fstab_entry() {
	# Not found by default.
	found=1

	for file in ${rootmnt?}/etc/fstab; do
		if [ -f "$file" ]; then
			# shellcheck disable=SC2034
			while read -r MNT_FSNAME MNT_DIR MNT_TYPE MNT_OPTS MNT_FREQ MNT_PASS MNT_JUNK; do
				case "$MNT_FSNAME" in
				  ""|\#*)
					continue;
					;;
				esac
				if [ "$MNT_DIR" = "$1" ]; then
					if [ -n "$2" ]; then
						[ "$MNT_TYPE" = "$2" ] || continue;
					fi
					found=0
					break 2
				fi
			done < "$file"
		fi
	done

	return $found
}

# Resolve device node from a name.  This expands any LABEL or UUID.
# $1=name
# Resolved name is echoed.
resolve_device() {
	DEV="$1"
	local orig="$DEV"

	case "$DEV" in
	LABEL=* | UUID=* | PARTLABEL=* | PARTUUID=*)
		if ! DEV="$(blkid -l -t "$DEV" -o device)"; then
			DEV="$orig"

			# Support uppercase and lowercase UUIDs -- see RFC#4122:
			#   "Each field is treated as an integer and has its value printed as
			#    a zero-filled hexadecimal digit string with the most significant
			#    digit first.  The hexadecimal values "a" through "f" are output as
			#    lower case characters and are case insensitive on input."
			#
			# Note: that blkid which we will use to map these assums the input is lower
			# case.

			# Only apply this behaviour to UUIDs.
			case "$DEV" in
			UUID=* | PARTUUID=*)	;;
			*)			return 1 ;;
			esac

			# Pull DEV apart and map it.
			local type value fmt
			type=$(echo "${DEV}" | cut -f 1 -d =)
			value=$(echo "${DEV}" | cut -f 2 -d = | tr 'A-F' 'a-f')

			# ... in RFC#4122 format;
			# look for five hexadecimal fragments separated by minus signs.
			fmt=$( echo "$value" | sed -e 's/[0-9a-fA-F]*//g' )
			if [ "$fmt" != '----' ]; then
				return 1
			fi
			DEV="${type}=${value}"

			# Retry with the lower cased UUID.
			DEV="$(blkid -l -t "$DEV" -o device)" || return 1
		fi
		;;
	esac
	[ -e "$DEV" ] && echo "$DEV"
}

# Check a file system.
# $1=device
# $2=mountpoint (for diagnostics only)
# $3=type (may be "auto")
_checkfs_once()
{
	DEV="$1"
	NAME="$2"
	TYPE="$3"
	if [ "$NAME" = "/" ] ; then
		NAME="root"
	fi
	FSCK_LOGFILE=/run/initramfs/fsck.log
	FSCK_STAMPFILE=/run/initramfs/fsck-${NAME#/}

	if [ "${TYPE}" = "auto" ]; then
		TYPE="$(get_fstype "${DEV}")"
	fi

	FSCKCODE=0
	if [ -z "${TYPE}" ]; then
		log_warning_msg "Type of $NAME file system is unknown, so skipping check."
		return
	fi
	if ! command -v fsck >/dev/null 2>&1; then
		log_warning_msg "fsck not present, so skipping $NAME file system"
		return
	fi
	if [ "${fastboot?}" = "y" ] ; then
		log_warning_msg "Fast boot enabled, so skipping $NAME file system check."
		return
	fi

	if [ "${forcefsck?}" = "y" ]
	then
		force="-f"
	else
		force=""
	fi

	if [ "${fsckfix?}" = "y" ]
	then
		fix="-y"
	elif [ "${fsckfix?}" = "n" ]
	then
		fix="-n"
	else
		fix="-a"
	fi

	spinner=""
	if [ -z "${debug?}" ]; then
		spinner="-C"
	fi

	if [ "${quiet}" = n ]
	then
		log_begin_msg "Will now check $NAME file system"
		# shellcheck disable=SC2086
		logsave -a -s $FSCK_LOGFILE fsck $spinner $force $fix -V -t "$TYPE" "$DEV"
		FSCKCODE=$?
		log_end_msg
	else
		log_begin_msg "Checking $NAME file system"
		# shellcheck disable=SC2086
		logsave -a -s $FSCK_LOGFILE fsck $spinner $force $fix -T -t "$TYPE" "$DEV"
		FSCKCODE=$?
		log_end_msg
	fi

	# NOTE: "failure" is defined as exiting with a return code of
	# 4, possibly or-ed with other flags. A return code of 1
	# indicates that file system errors were corrected but that
	# the boot may proceed.
	#
	if [ "$FSCKCODE" -eq 32 ]
	then
		log_warning_msg "File system check was interrupted by user"
	elif [ $((FSCKCODE & 4)) -eq 4 ]
	then
		log_failure_msg "File system check of the $NAME filesystem failed"
		return 1
	elif [ "$FSCKCODE" -gt 1 ]
	then
		log_warning_msg "File system check failed but did not detect errors"
		sleep 5
	else
		true >"$FSCK_STAMPFILE"
	fi
	return 0
}

checkfs()
{
	while ! _checkfs_once "$@"; do
		panic "The $2 filesystem on $1 requires a manual fsck"
	done
}

# Mount a file system.  We parse the information from the fstab.  This
# should be overridden by any boot script which can mount arbitrary
# filesystems such as /usr.  This default implementation delegates to
# local or nfs based upon the filesystem type.
# $1=mountpoint mount location
mountfs()
{
	type=local
	read_fstab_entry "$1"
	if [ "${MNT_TYPE}" = "nfs" ] || [ "${MNT_TYPE}" = "nfs4" ]; then
		type=nfs
	fi

	${type}_mount_fs "$1"
}

# Mount the root file system.  It should be overridden by all
# boot scripts.
mountroot()
{
	:
}

# Run /scripts/${boot}-top.  This should be overridden by all boot
# scripts.
mount_top()
{
	:
}

# Run /scripts/${boot}-premount.  This should be overridden by all boot
# scripts.
mount_premount()
{
	:
}

# Run /scripts/${boot}-bottom.  This should be overridden by all boot
# scripts.
mount_bottom()
{
	:
}