uswsusp 1.0+20120915-4ubuntu1 / postinst

#!/bin/bash
set -e

# uswsusp.postinst -- postinst script for uswsusp debian package
#
# Copyright 2006, 2007	Tim Dijkstra <tim@famdijkstra.org>
# Copyright 2012	Rodolfo Garc�a Pe�as <kix@kix.es>
#  04-2012 Full rewrited
# Released under GPLv2

. /usr/share/debconf/confmodule

CONFIGNAME=uswsusp.conf
CONFIGFILE=/etc/$CONFIGNAME
SWAPOFFSET=/usr/sbin/swap-offset

LOWQ="snapshot_device compute_checksum compress early_writeout image_size suspend_loglevel max_loglevel"
MEDQ="resume_device encrypt"
HIGHQ=""
NOTQ="RSA_key_file shutdown_method resume_offset"

# If we don't have /proc or /sys we can't work, this will probably
# be a chroot or so.
function check_filesystems
{
	mountpoint -q /sys || {
		echo "/sys not mounted. Can't create $CONFIGNAME" >> /dev/stderr;
		exit 0; }
	mountpoint -q /proc || {
		echo "/proc not mounted. Can't create $CONFIGNAME" >> /dev/stderr;
		exit 0; }
}


check_requirements()
{
	# Check if we have swap, else exit.
	db_fget uswsusp/no_swap hit
	[ "$RET" = "false" ] || exit 0;

	# Check if we have /dev/snapshot, else exit.
	db_fget uswsusp/no_snapshot hit
	[ "$RET" = "false" ] || exit 0;

	# Check if filesystems /proc and /sys are mounted
	check_filesystems
}

case "$1" in
	configure)
		# Check requirements to continue
		check_requirements

		# We skip calculating offset if the user agreed to continue
		# without swap
		db_fget uswsusp/continue_without_swap hit
		if [ "$RET" != "true" ];
		then
			# swap-offset returns only something for a swap file
			# Effectively we're also resetting offset in case of a partition
			db_get uswsusp/resume_device
			dname=$RET
			db_set uswsusp/resume_offset $($SWAPOFFSET $dname 2> /dev/null | cut -c17-)

			# We have to translate the devid to a device file.
			if [ "$(awk '$1=="'$dname'" {print $2}' /proc/swaps)" == "file" ];
			then
				if ! devid=$(stat -c "%d" $dname);
				then
					# It is permissible for swap to be a regular file, which
					# is typically not available in a chroot (and this script
					# needs to work in chroots too).
					echo "The swapfile $dname could not be found, exiting." >&1
					exit 0
				fi
				devnode="/dev/"$(awk '$1=='$(($devid>>8))' && $2=='$(($devid&0x00ff))' {print $4}' /proc/partitions)

				# This shouldn't happen that much...
				if [ ! -b $devnode ];
				then
					echo "You have a strange /dev layout." >&1
					echo "I couldn't find a node with devid $(($devid>>8)):$(($devid&0x00ff))" >&1
					exit 0;
				fi

				db_set uswsusp/resume_device $devnode
			fi
		fi

		if [ ! -f $CONFIGFILE -o ! -s $CONFIGFILE ];
		then
			echo "# $CONFIGFILE(5) -- Configuration file for s2disk/s2both " > $CONFIGFILE
		fi

		TMPFILE=`mktemp`
		cp -f $CONFIGFILE $TMPFILE

		SEDCMD=""

		for I in $MEDQ $LOWQ $HIGHQ $NOTQ; do
			db_get uswsusp/$I
			VAL=$RET

			db_metaget uswsusp/$I type
			TYPE=$RET

			if [ "boolean" = "$TYPE" ];
			then
				if [ "$VAL" = "true" ];
				then
					VAL="y";
				else
					VAL=
				fi
			fi

			PATRN="^[[:space:]]*${I//_/ }[[:space:]]*[:=]"

			# If we didn't got a value, we want the hardcoded default, so del
			if [ -z "$VAL" ];
			then
				SEDCMD="$SEDCMD -e '/$PATRN/ d'"
			# Else, rewrite the value
			elif eval grep -q -e "'$PATRN'" $CONFIGFILE;
			then
				SEDCMD="$SEDCMD -e 's/$PATRN.*$/${I//_/ } = ${VAL//\//\\/}/'"
			# Or add it
			else
				SEDCMD="$SEDCMD -e '$ a ${I//_/ } = $VAL'"
			fi
		done

		eval sed $SEDCMD < $CONFIGFILE > $TMPFILE
		eval cat $TMPFILE > $CONFIGFILE
		eval rm $TMPFILE

 		db_get uswsusp/create_RSA_key
		if [ "$RET" = "true" ]; then
			db_get uswsusp/RSA_key_bits
			BITS=$RET

			db_get uswsusp/RSA_key_file
			KEYFILE=$RET

			db_get uswsusp/RSA_passphrase
			PASS=$RET

			if [ -n "$BITS" ] && [ -n "$KEYFILE" ] && [ -n "$PASS" ];
			then
				echo "Generating RSA key, this may take a while ..."
				suspend-keygen <<EOFa &> /dev/null
$BITS
$PASS
$PASS
$KEYFILE
EOFa
			else
				echo "One of the arguments to suspend-keygen was empty!"
				echo "No key generated!"
			fi
			db_reset uswsusp/RSA_passphrase
			db_reset uswsusp/RSA_passphrase_v
		fi

		if [ -x /usr/sbin/update-initramfs -a -e /etc/initramfs-tools/initramfs.conf ];
		then
			update-initramfs -u;
		fi

		# Make snapshot device if they choose /dev/snapshot
		db_get uswsusp/snapshot_device
		if [ -z "$RET" -a  ! -c /dev/snapshot ];
		then
			if [ -x /dev/MAKEDEV ] ; then
				# Until MAKEDEV knows how to make it ...
				DEV=`cat /sys/class/misc/snapshot/dev `
				(cd /dev; ./MAKEDEV snapshot) || mknod /dev/snapshot c ${DEV%:*} ${DEV#*:}
			else
				echo "The config file is using snapshot device"
				echo "But /dev/MAKEDEV do not exists!"
			fi
		fi
		;;

	abort-upgrade|abort-remove|abort-deconfigure)
		;;

	*)
		echo "postinst called with unknown argument \`$1'" >&2
		exit 1
		;;
esac



exit 0