kde4_shutdown.sh script for stopping KDE4 session, saving it

[cz0]

Here comes my script, that can shutdown KDE 4 saving current session. It can do the work from a regular user (session owner) and root, that makes it suitable for been run from acpid. Maybe it will help somebody. All comments are welcome.

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# /bin/sh
# Written by cz0 2010
# Distributed under the terms of the GNU General Public License v2

SU="/bin/su"
QDBUS="/usr/bin/qdbus"
TIMEOUT="20"
USER="$(/usr/bin/whoami)"

for KDEPID in $(ps aux | grep 'startkde' | grep -v 'grep' | awk '{print $2}'); do
        KDEUSER=$(ps u $KDEPID | grep 'startkde' | awk '{print $1}')

        if [[ "$KDEUSER" != "$USER" && "$USER" != "root" ]] ; then
                logger "kde4_shutdown: unable to stop KDE session of user $KDEUSER"
                exit 67
        fi

        CURRENT_DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$(ps h --ppid $KDEPID -o pid | awk '{print $1}')/environ | sed -e 's/DBUS_SE>
        export DBUS_SESSION_BUS_ADDRESS=$CURRENT_DBUS_SESSION_BUS_ADDRESS

        logger  "kde4_shutdown: sending shutdown signal to KDE session pid=$KDEPID owner uid=$KDEUSER via $DBUS_SESSION_BUS_ADDRESS"

        if [[ "$USER" == "root" ]] ; then
                $SU -c "$QDBUS org.kde.ksmserver /KSMServer logout 0 0 0" $KDEUSER
        else
                $QDBUS org.kde.ksmserver /KSMServer logout 0 0 0
        fi

        while [[ "$(ps h --ppid $KDEPID -o pid)" != "" && $TIMEOUT > 0 ]] ; do
                sleep 1s
                let "TIMEOUT -= 1"
        done
done

[Grimi]

I wanted to logoff without killing the X-Server because out of the blue my kde froze.

This qdus thingy works pretty well. I stumbled upon this via some other forums and traced it back to here. And because i myself use gentoo, so I just want say thank you for sharing this information!

[SiliconBadger]

Copied and pasted into a text file, made it executable, and I get this error when running the script. Is it supposed to take any arguments? I don't know anything about scripts.

kde-shutdown: line 18: unexpected EOF while looking for matching `''
kde-shutdown: line 34: syntax error: unexpected end of file

[urcindalo]

Copied and pasted into a text file, made it executable, and I get this error when running the script. Is it supposed to take any arguments? I don't know anything about scripts.

kde-shutdown: line 18: unexpected EOF while looking for matching `''
kde-shutdown: line 34: syntax error: unexpected end of file

Same here

[Johanns]

I figured out why the posted script was giving errors. The line that begins with "CURRENT_DBUS_SESSION_BUS_ADDRESS=" and ends with ">" seems to have been truncated. It seems like there is (or at least was) a KDE issue where an important environment variable DBUS_SESSION_BUS_ADDRESS is/was not set properly. This part of the script appears to be a workaround for this problem. I changed the script to automatically set this variable correctly, but only if it is not already set. I think this is safer since at least on my system this variable is already set. I did test that this clever technique for figuring out how KDE set this variable for itself actually works fine.

Below is my attempt at a corrected version. It works for me under Suse 12.1.

I am not sure why Kde does not come with a shell script like this one to allow logging out of Kde without resorting to the menu.

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# /bin/sh
# Written by cz0 2010
# Distributed under the terms of the GNU General Public License v2

SU="/bin/su"
QDBUS="/usr/bin/qdbus"
TIMEOUT="20"
USER="$(/usr/bin/whoami)"

for KDEPID in $(ps aux | grep 'startkde' | grep -v 'grep' | awk '{print $2}'); do
        KDEUSER=$(ps u $KDEPID | grep 'startkde' | awk '{print $1}')

        if [[ "$KDEUSER" != "$USER" && "$USER" != "root" ]] ; then
                logger "kde4_shutdown: unable to stop KDE session of user $KDEUSER"
                exit 67
        fi

        # If the DBUS_SESSION_BUS_ADDRESS environment variable is not already set correctly
        # then set it by finding the environment file for the startkde process in proc and
        # parsing it to get get the correct setting.
        if [ -z "$DBUS_SESSION_BUS_ADDRESS" ]; then
                ENVIRON_FILE=/proc/$(ps h --ppid $KDEPID -o pid | awk '{print $1}')/environ
                CURRENT_DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS $ENVIRON_FILE | sed -e 's/DBUS_SESSION_BUS_ADDRESS=//')
                export DBUS_SESSION_BUS_ADDRESS=$CURRENT_DBUS_SESSION_BUS_ADDRESS
        fi

        logger  "kde4_shutdown: sending shutdown signal to KDE session pid=$KDEPID owner uid=$KDEUSER via $DBUS_SESSION_BUS_ADDRESS"

        if [[ "$USER" == "root" ]] ; then
                $SU -c "$QDBUS org.kde.ksmserver /KSMServer logout 0 0 0" $KDEUSER
        else
                $QDBUS org.kde.ksmserver /KSMServer logout 0 0 0
        fi

        while [[ "$(ps h --ppid $KDEPID -o pid)" != "" && $TIMEOUT > 0 ]] ; do
                sleep 1s
                let "TIMEOUT -= 1"
        done
done 

[steveL]

You can replace:

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ps aux | grep 'startkde' | grep -v 'grep' | awk '{print $2}'

with:

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ps aux | awk '/startkde/ && ! /awk/ { print $2 }'

which will save two forks of grep and make things a bit quicker. pgrep from sys-process/procps is a much better method, however.
You can even speed it up further without using regexen at all:

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ps aux | awk 'index ($0, "startkde") && ! index($0, "awk") { print $2 }'

Actually I see you're getting the user id as well: I'd do this all in one with:

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ps aux | awk -v u="$LOGNAME" '/startkde/ && ! /awk/ && $1 == u { print $2 }'

Not sure if that's right for your logic checking against username, though. Just: { print $1, $2 } gets the info, but you'd have to do:

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local u pid data
data=$(ps aux | awk '/startkde/ && ! /awk/ { print $1, $2 }'
while read -r u pid; do
case $u in
	"$LOGNAME") :
;;	*) logger "kde4_shutdown: unable to stop KDE session of user $u"
	exit 67
esac
done << EOF
$data
EOF

or the like to process the data, since we don't have BASH < <(process substitution) nor <<< "$var" input.

Just for ref, with pgrep that'd be:

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pgrep -u "$LOGNAME" startkde

LOGNAME is the standard POSIX environment variable for the currently logged-in user.

HTH,
steveL