void-packages/srcpkgs/initramfs-tools/files/scripts/functions

# -*- shell-script -*-

_log_msg()
{
	[ "$quiet" = "y" ] && return
	printf "\033[1m"
	printf "$@"
	printf "\033[m\n"
}

log_success_msg()
{
	_log_msg "Success: $@\n"
}

log_failure_msg()
{
	_log_msg "Failure: $@\n"
}

log_warning_msg()
{
	_log_msg "Warning: $@\n"
}

log_begin_msg()
{
	_log_msg "$@ ..."
}

log_end_msg()
{
	:
}

panic()
{
	if command -v chvt >/dev/null 2>&1; then
		chvt 1
	fi

	# Disallow console access
	if [ -n "${panic}" ]; then
		sleep ${panic}
		reboot
	fi
	modprobe i8042
	modprobe atkbd
	echo "$@"
	REASON="$@" PS1='(initramfs) ' /bin/sh -i </dev/console >/dev/console 2>&1
}

maybe_break()
{
	if [ "${break:-}" = "$1" ]; then
		panic "Spawning shell within the initramfs"
	fi
}

render()
{
	eval "echo -n \${$@}"
}

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"
			continue
			;;
		esac

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

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

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

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

reduce_satisfied()
{
	deplist="$(render array_${1})"
	unset tmpdeplist
	for rs_y in ${deplist}; do
		# only allow variable name chars
		case ${rs_y} in
		*[![:alnum:]\._-]*)
			continue
			;;
		esac
		# skip non executable scripts
		[ ! -x ${initdir}/${rs_y} ] && continue
		# skip directories
		[ -d ${initdir}/${rs_y} ] && continue
		# skip bad syntax
		sh -n ${initdir}/${rs_y} || continue

		tmpdeplist="${tmpdeplist} ${rs_y}"
	done
	deplist=${tmpdeplist}
	for rs_x in ${runlist}; do
		pop_list_item ${rs_x} ${deplist}
		deplist=${tmppop}
	done
	eval array_${1}=\"${deplist}\"
}

get_prereqs()
{
	set_initlist
	for gp_x in ${initlist}; do
		tmp=$(${initdir}/${gp_x} prereqs)
		eval array_${gp_x}=\"${tmp}\"
	done
}

count_unsatisfied()
{
	set -- ${@}
	return ${#}
}

# Removes $1 from initlist
pop_list_item()
{
	item=${1}
	shift
	set -- ${@}
	unset tmppop
	# Iterate
	for pop in ${@}; do
		if [ ${pop} = ${item} ]; then
			continue
		fi
		tmppop="${tmppop} ${pop}"
	done

}

# This function generates the runlist, so we clear it first.
reduce_prereqs()
{
	unset runlist
	set -- ${initlist}
	i=$#
	# Loop until there's no more in the queue to loop through
	while [ ${i} -ne 0 ]; do
		oldi=${i}
		for rp_x in ${initlist}; do
			reduce_satisfied ${rp_x}
			count_unsatisfied $(render array_${rp_x})
			cnt=${?}
			if [ ${cnt} -eq 0 ]; then
				runlist="${runlist} ${rp_x}"
				pop_list_item ${rp_x} ${initlist}
				initlist=${tmppop}
				i=$((${i} - 1))
			fi
		done
		if [ ${i} -eq ${oldi} ]; then
			panic "PANIC: Circular dependancy.  Exiting."
		fi
	done
}

get_prereq_pairs()
{
	set_initlist
	for gp_x in ${initlist:-}; do
		echo ${gp_x} ${gp_x}
		prereqs=$(${initdir}/${gp_x} prereqs)
		for prereq in ${prereqs}; do
			echo ${prereq} ${gp_x}
		done
	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()
{
	initdir=${1}
	[ ! -d ${initdir} ] && return

	if [ -f ${initdir}/ORDER ]; then
		. ${initdir}/ORDER
	elif command -v tsort >/dev/null 2>&1; then
		runlist=$(get_prereq_pairs | tsort)
		call_scripts ${2:-}
	else
		get_prereqs
		reduce_prereqs
		call_scripts
	fi
}

# Load custom modules first
load_modules()
{
	if [ -e /conf/modules ]; then
		cat /conf/modules | while read 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
			modprobe $m
		done
	fi
}

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

	FSTYPE=$(blkid -o value -s TYPE "${FS}")
	RET=$?

	if [ -z "${FSTYPE}" ]; then
		FSTYPE="unknown"
	fi

	echo "${FSTYPE}"
	return ${RET}
}

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