uswsusp 1.0+20110509-2ubuntu1 / postinst

#!/bin/bash
#
# uswsusp.postinst -- postinst script for uswsusp debian package
#
# Copyright 2006    Tim Dijkstra <tim@famdijkstra.org>
# Released under GPLv2

set -e

. /usr/share/debconf/confmodule

CONFIGFILE=/etc/uswsusp.conf

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


case "$1" in
    # abort-upgrade happens if on upgrade new and old prerm fail
    configure)
	db_fget uswsusp/no_swap hit
	[ "$RET" = "false" ] || exit 0;
	db_fget uswsusp/no_snapshot hit
	[ "$RET" = "false" ] || exit 0;
	# If we don't have /proc or /sys we can't work, this will probably
	# be a chroot or so.
	mountpoint -q /sys || exit 0;
	mountpoint -q /proc || exit 0;

	# 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 $(swap-offset $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
	VAL=$RET
	if [ "$VAL" = "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
	VAL=$RET
	if [ -z "$VAL" -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

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.



exit 0