#
# Start/Stop the workload manager
#
# Copyright IBM Corporation. 2008
#
# Authors:     Balbir Singh <balbir@linux.vnet.ibm.com>
# This program is free software; you can redistribute it and/or modify it
# under the terms of version 2.1 of the GNU Lesser General Public License
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#

#### BEGIN INIT INFO
# Provides:             cgconfig
# Required-Start:       $local_fs $syslog $time
# Required-Stop:        $local_fs $syslog
# Should-Start:
# Should-Stop:
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    start and stop the WLM configuration
# Description:          This script allows us to create a default configuration
#### END INIT INFO

PATH=/bin:/usr/bin:/sbin:/usr/sbin:.
MOUNTS_FILE=/proc/mounts
PROC_CGROUPS_FILE=/proc/cgroups
CGROUP_FS=cgroup
CONFIG_FILE=/etc/cgconfig.conf

# support multiple mount points
declare -a MOUNTPOINT
declare -a MOUNTOPTS
maxindex=0

#
# Source LSB routines
#
. /lib/lsb/init-functions

parse_mounts() {
    while read name mountpt fs opts other
    do
        if echo $name | grep -q $CGROUP_FS
        then
            maxindex=$(($maxindex+1))
            MOUNTPOINT[$maxindex]=$mountpt
            MOUNTOPTS[$maxindex]=$opts
        fi
    done < $MOUNTS_FILE

    return 0;
}

umount_fs() {
        for i in `seq 1 $maxindex`
        do
                umount ${MOUNTPOINT[$i]}
                rmdir ${MOUNTPOINT[$i]}
        done
}

start() {
	if [ -f /var/lock/cgconfig ]
        then
            log_warning_msg "lock file already exists"
            return
        fi

        if [ $? -eq 0 ]
        then
                log_progress_msg "Starting cgconfig service: "
                cgconfigparser -l $CONFIG_FILE
        fi
        [ $? == 0 ] && touch /var/lock/cgconfig
        return $?
}

move_all_to_init_class() {
    for i in `seq 1 $maxindex`
    do
        cd ${MOUNTPOINT[$i]}
        cat /proc/mounts | grep -wq ${MOUNTPOINT[$i]}
        if [ $? -ne 0 ]
        then
            log_failure_msg "resource control filesystem not mounted"
            exit 1
        fi

        for i in `find . -type d`
        do
            case $i in
            '.')
                ;;
            *)
                class=${i#./*}
                log_progress_msg "Removing class $class"
                sed -nu p < ./$i/tasks > tasks
                rmdir $i
                ;;
            esac
        done
        cd - > /dev/null
    done
}


stop() {
    move_all_to_init_class
    umount_fs
    rm -f /var/lock/cgconfig
}

trapped() {
    #
    # Do nothing
    #
    true
}

usage() {
    echo "$0 <start|stop>"
    exit 1
}

common() {
    #
    # main script work done here
    #
    trap "trapped ABRT" ABRT
    trap "trapped QUIT" QUIT
    trap "trapped TERM" TERM
    trap "trapped INT"   INT

    parse_mounts
}

case $1 in
    'stop')
        common
        stop;
        ;;
    'start')
        common
        start;
        ;;
    'restart')
        common
	stop
        start
        ;;
    'reload')
        common
	stop
        start
        ;;
    *)
        usage
        ;;
esac