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#!/bin/sh

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
	prereqs
	exit 0
	;;
esac

. /usr/share/initramfs-tools/scripts/functions

# First check if a location is set and is a valid swap partition.
# If so, the config file will be copied in and there is nothing to do.
if [ -n "$RESUME" ] && [ "$RESUME" != auto ]; then
	if [ "$RESUME" = none ]; then
		exit 0
	fi
	if resume_dev_node="$(resolve_device "$RESUME")" && \
	   blkid -p -n swap "$resume_dev_node" >/dev/null 2>&1; then
		exit 0
	fi

	echo >&2 "W: initramfs-tools configuration sets RESUME=$RESUME"
	echo >&2 "W: but no matching swap device is available."
fi

# If we were not explicitly requested to select a device, report that we
# are doing so
report_auto()
{
	test "$RESUME" = auto || echo >&2 "I: $*"
}

# We need to be able to read the listed swap partitions
if ischroot || [ ! -r /proc/swaps ]; then
	resume_auto=
else
	# Try to autodetect the RESUME partition, using biggest swap?
	resume_auto=$(grep ^/dev/ /proc/swaps | sort -rnk3 | head -n 1 | cut -d " " -f 1)
	if [ -n "$resume_auto" ]; then
		dm_name="$(dmsetup info -c --noheadings -o name "$resume_auto" 2>/dev/null)"
	fi
	if [ -n "$dm_name" ] && [ -e /etc/crypttab ]; then
		while read cryptdev srcdev keyfile junk; do
			if [ "$cryptdev" = "$dm_name" ] && [ "$keyfile" = /dev/urandom ]; then
				resume_auto=
			fi
		done < /etc/crypttab
	fi
	if [ -n "$resume_auto" ]; then
		if [ -n "$dm_name" ]; then
			resume_auto_canon="/dev/mapper/$dm_name"
		elif UUID=$(blkid -s UUID -o value "$resume_auto"); then
			resume_auto_canon="UUID=$UUID"
		else
			resume_auto_canon=
		fi
		report_auto "The initramfs will attempt to resume from $resume_auto"
		if [ -n "$resume_auto_canon" ]; then
			report_auto "($resume_auto_canon)"
			resume_auto="$resume_auto_canon"
		fi
		report_auto "Set the RESUME variable to override this."
	fi
fi

# Write selected resume device to intramfs conf.d
if [ "$RESUME" = auto ] || [ -n "$resume_auto" ]; then
	# If we were explicitly requested to select a device, and we failed,
	# report that
	if [ -z "$resume_auto" ]; then
		echo >&2 "W: initramfs-tools failed to select a resume device"
	fi
	echo "RESUME=${resume_auto}" > ${DESTDIR}/conf/conf.d/zz-resume-auto
fi