#! /bin/sh
#
# Init script for virtlogd
#
# (c) 2015 Guido Guenther <agx@sigxcpu.org>
# based on the skeletons that comes with dh_make
#
### BEGIN INIT INFO
# Provides:          virtlogd
# Required-Start:    $local_fs $remote_fs $syslog
# Required-Stop:     $local_fs $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Libvirt logging daemon
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
export PATH

NAME=virtlogd
DESC="libvirt logging daemon"
DAEMON=/usr/sbin/$NAME
INITSCRIPT=/etc/init.d/$NAME
DEFAULTFILE=/etc/default/$NAME
PIDFILE=/var/run/$NAME.pid

test -x $DAEMON || exit 0
. /lib/lsb/init-functions

DODTIME=1                   # Time to wait for the server to die, in seconds

# Include defaults if available
if [ -f $DEFAULTFILE ] ; then
    . $DEFAULTFILE
fi

running_pid()
{
    # Check if a given process pid's cmdline matches a given name
    pid=$1
    name=$2
    [ -z "$pid" ] && return 1
    [ ! -d /proc/$pid ] && return 1
    cmd=`cat /proc/$pid/cmdline | tr "\000" "\n" | head -n 1 | cut -d : -f 1`
    # Is this the expected child?
    [ "$cmd" != "$name" ] && return 1
    return 0
}

running()
{
    # Check if the process is running looking at /proc
    # (works for all users)

    # No pidfile, probably no daemon present
    [ ! -f "$PIDFILE" ] && return 1
    # Obtain the pid and check it against the binary name
    pid=`cat $PIDFILE`
    running_pid $pid $DAEMON || return 1
    return 0
}

force_stop() {
    # Forcefully kill the process
    [ ! -f "$PIDFILE" ] && return
    if running ; then
        kill -15 $pid
        # Is it really dead?
        [ -n "$DODTIME" ] && sleep "$DODTIME"s
        if running ; then
            kill -9 $pid
            [ -n "$DODTIME" ] && sleep "$DODTIME"s
            if running ; then
                echo "Cannot kill $LABEL (pid=$pid)!"
                exit 1
            fi
        fi
    fi
    rm -f $PIDFILE
    return 0
}

case "$1" in
    start)
        log_daemon_msg "Starting $DESC" "$NAME"
        if running ; then
            log_progress_msg "already running"
            log_end_msg 0
            exit 0
        fi
        rm -f $PIDFILE
        start-stop-daemon --start --quiet --pidfile $PIDFILE \
                          --exec $DAEMON -- -d $VIRTLOGD_ARGS
        if running; then
            log_end_msg 0
        else
            log_end_msg 1
        fi
        ;;
    stop)
        log_daemon_msg "Stopping $DESC" "$NAME"
        if ! running ; then
            log_progress_msg "not running"
            log_end_msg 0
            exit 0
        fi
        start-stop-daemon --stop --quiet --pidfile $PIDFILE \
                          --exec $DAEMON
        log_end_msg 0
        ;;
    force-stop)
        log_daemon_msg "Forcefully stopping $DESC" "$NAME"
        force_stop
        if ! running; then
            log_end_msg 0
        else
            log_end_msg 1
        fi
        ;;
    restart)
        log_daemon_msg "Restarting $DESC" "$DAEMON"
        start-stop-daemon --oknodo --stop --quiet --pidfile $PIDFILE \
                          --exec $DAEMON
        [ -n "$DODTIME" ] && sleep $DODTIME
        start-stop-daemon --start --quiet --pidfile $PIDFILE \
                          --exec $DAEMON -- -d $VIRTLOGD_ARGS
        if running; then
            log_end_msg 0
        else
            log_end_msg 1
        fi
        ;;
    reload|force-reload)
        if running; then
            log_daemon_msg "Reloading configuration of $DESC" "$NAME"
            start-stop-daemon --stop --signal 1 --quiet \
                              --pidfile $PIDFILE --exec $DAEMON
            log_end_msg 0
        else
            log_warning_msg "$NAME not running, doing nothing."
        fi
        ;;
    status)
        log_daemon_msg "Checking status of $DESC" "$NAME"
        if running ; then
            log_progress_msg "running"
            log_end_msg 0
        else
            log_progress_msg "not running"
            log_end_msg 1
            if [ -f "$PIDFILE" ] ; then
                exit 1
            else
                exit 3
            fi
        fi
        ;;
    *)
        echo "Usage: $INITSCRIPT {start|stop|restart|reload|force-reload|status|force-stop}" >&2
        exit 1
        ;;
esac

exit 0
