config is in uswsusp 1.0+20120915-4ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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set -e
# uswsusp.config -- configure 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
CONFIGNAME=uswsusp.conf
CONFIGFILE=/etc/$CONFIGNAME
SWAPOFFSET=/usr/sbin/swap-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 $CONFIGNAME" >> /dev/stderr;
exit 0; }
}
# This function returns the full path in /dev/disk/by-uuid
# for a given /dev device. If not found, returns the /dev device.
function dev_to_uuid
{
local link
local path
local uuid
[ -d /dev/disk/by-uuid ] || return
uuid=$tmpswap
for path in /dev/disk/by-uuid/*; do
link=$(readlink -f "$path")
if [ "$link" = "$tmpswap" ]; then
uuid=${path}
break;
fi
done
tmpswap=$uuid
}
function get_list_of_swaps
{
SWAPLIST=
SWAPFIRST=
KOMMA=
tmpswap=
# Swap file support is from 2.6.20
if dpkg --compare-versions `uname -r` lt 2.6.20; then
NO_FILE=' && $2!="file"'
fi
# List of swaps, listed by size
for tmpswap in `sort -nr -k 3 /proc/swaps | awk '$2!="Type" '"$NO_FILE"' {print $1}'`; do
dev_to_uuid
SWAPLIST=${SWAPLIST}${KOMMA}${tmpswap}
if [ -z "$KOMMA" ]; then
SWAPFIRST=${tmpswap}
KOMMA=", "
fi
done
}
# This function checks snapshot support
function check_snapshot_support
{
if [ ! -e /sys/class/misc/snapshot/dev ]; then
db_input critical uswsusp/no_snapshot || true
db_fset uswsusp/no_snapshot hit true
db_go || true
exit 0
fi
}
# This function sets the max size of image
function set_image_size
{
IMAGESIZE=`awk '$1 == "MemTotal:" {printf("%lu\n", $2*1024*0.46)}' /proc/meminfo 2> /dev/null`
if [ -n "$IMAGESIZE" ]; then
db_set uswsusp/image_size $IMAGESIZE
fi
}
# Read the configuration file
function read_config_file
{
# Luckily the parser in s2disk is quite strict
for i in $LOWQ $MEDQ $HIGHQ $NOTQ; do
VAL=`sed -n 's/^[[:space:]]*'"${i//_/ }"'[[:space:]]*[=:][[:space:]]*\([^[:space:]]*\)/\1/ p' $CONFIGFILE`
# For boolean values it only checks for [yY]
db_metaget uswsusp/${i} type
TYPE=$RET
if [ "boolean" = "$TYPE" ]; then
if [ "$VAL" = "y" -o "$VAL" = "Y" ]; then
db_set uswsusp/${i} true
else
db_set uswsusp/${i} false
fi
else
db_set uswsusp/${i} "$VAL"
fi
done
}
function get_partition_to_use
{
if [ -z "$USERSWAP" ]; then
# The user didn't set one: Set the first as default
SWAPDEFAULT=$SWAPFIRST
elif echo "$SWAPLIST" | grep -q -e '\(^\|, \)'$USERSWAP'\(,\|$\)'; then
# Valid swap partition
SWAPDEFAULT=$USERSWAP
elif [ -n "$USEROFFSET" ] && [ -x $SWAPOFFSET ]; then
# Offset was specified
# If we don't have swap-offset, this probably means uswsusp
# was removed before, leaving the config file. Now we don't
# have a way to check the offset. Best is to ask if this is OK
devid=`printf "%x%02x" $(stat -c "0x%t 0x%T" $USERSWAP 2> /dev/null)`
while read name type rest; do
[ "$type" == "file" ] || continue;
[ "$(stat -c '%D' $name)" == "$devid" ] || continue;
[ "$USEROFFSET" == "$(swap-offset $name | cut -c17- )" ] || continue;
SWAPDEFAULT=$name
break
done < /proc/swaps
fi
}
# Some people want to use a swap partition that is only mounted
# during suspend. This means we can't find it in /proc/swaps, but
# it is a valid option non the less. To not remove their changes
# we add it to the SWAPLIST, but not after we confirmed this is
# what they want.
function get_partition_mounted_to_use
{
# This can be:
# Offset is given, no sbin/swap-offset
# Offset is given, USERSWAP:USEROFFSET not in /proc/swaps
# No offset, USERSWAP not in /proc/swaps
db_input critical uswsusp/continue_without_swap || true
db_get uswsusp/continue_without_swap
if [ "$RET" = "true" ]; then
SWAPLIST=${SWAPLIST}${KOMMA}${USERSWAP} ;
SWAPDEFAULT=${USERSWAP}
db_fset uswsusp/continue_without_swap hit true
fi
}
function setup_priority_questions
{
for i in $LOWQ; do
db_input low uswsusp/${i} || true
done
for i in $MEDQ; do
db_input medium uswsusp/${i} || true
done
for i in $HIGHQ; do
db_input high uswsusp/${i} || true
done
# Ask questions
db_go || true
}
function set_encryption
{
# First ask filename
while [ 1 ] ; do
db_input low uswsusp/RSA_key_file || true
db_go || true
db_get uswsusp/RSA_key_file || true
KEYFILE=$RET
if [ -n "$KEYFILE" ]; then
break
fi
db_reset uswsusp/RSA_key_file
done
# Then ask if we should generate it, default to yes if they don't have one yet
if [ -e "$KEYFILE" ]; then
db_set uswsusp/create_RSA_key false
else
db_set uswsusp/create_RSA_key true
fi
db_input low uswsusp/create_RSA_key || true
db_go || true
# If they want it created, ask nr bits and passphrase (twice)
db_get uswsusp/create_RSA_key
if [ "$RET" = "true" ]; then
while [ 1 ]; do
db_input low uswsusp/RSA_key_bits || true
db_go || true
db_get uswsusp/RSA_key_bits
if [ -z "$RET" ] || [ $RET -ge 1024 -a $RET -le 4096 ]; then
break;
fi
db_reset uswsusp/RSA_key_bits
done
P1=A; P2=B;
while [ "$P1" != "$P2" ]; do
db_input critical uswsusp/RSA_passphrase || true
db_input critical uswsusp/RSA_passphrase_v || true
db_go || true
db_get uswsusp/RSA_passphrase
if [ -n "$RET" ]; then
P1=$RET;
fi
db_get uswsusp/RSA_passphrase_v
if [ -n "$RET" ]; then
P2=$RET;
fi
done
fi
}
# MAIN SCRIPT #
. /usr/share/debconf/confmodule
LOWQ="snapshot_device compute_checksum compress early_writeout image_size suspend_loglevel max_loglevel shutdown_method"
MEDQ="resume_device encrypt"
HIGHQ=""
NOTQ="RSA_key_file shutdown_method resume_offset"
# Check if filesystems /proc and /sys are mounted
check_filesystems
# Reset these flags
db_fset uswsusp/no_swap hit false
db_fset uswsusp/no_snapshot hit false
db_fset uswsusp/continue_without_swap hit false
# Try to detect snapshot support
check_snapshot_support
# Get the list of swap devices
get_list_of_swaps
# Set the maximum size for image
set_image_size
# If config file, read it
if [ -e "$CONFIGFILE" ]; then
read_config_file
fi
# Check resume_device and resume_offset from the config file
db_get uswsusp/resume_device
# If the file is a device file, translate to uuid file
# Else we can get an error about file is not active.
# debconf error uswsusp/continue_without_swap
tmpswap=$RET
dev_to_uuid
USERSWAP=$tmpswap
db_get uswsusp/resume_offset
USEROFFSET=$RET
# Get the swap partition to use
get_partition_to_use
# Some people want to use a swap partition that is only mounted
# during suspend. This means we can't find it in /proc/swaps, but
# it is a valid option non the less. To not remove their changes
# we add it to the SWAPLIST, but not after we confirmed this is
# what they want.
if [ -z "$SWAPDEFAULT" ]; then
get_partition_mounted_to_use
fi
# If we still do not have a SWAPLIST, something is wrong
if [ -z "$SWAPLIST" ]; then
db_input critical uswsusp/no_swap || true
db_fset uswsusp/no_swap hit true
db_go || true
exit 0
fi
db_subst uswsusp/resume_device list $SWAPLIST
db_set uswsusp/resume_device $SWAPDEFAULT
# If we're still here, reset the seen flags on error messages
# Maybe they had problems before, but not anymore...
db_fset uswsusp/no_swap seen false
db_fset uswsusp/no_snapshot seen false
# Stetup questions according to priority
setup_priority_questions
# Only if they want encryption, ask the RSA question
db_get uswsusp/encrypt
if [ "$RET" = "false" ]; then
db_set uswsusp/create_RSA_key false
elif [ "$RET" = "true" ]; then
set_encryption
fi
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