#! /bin/sh
#
# Copyright (c) 2013-2015 Red Hat.
# Copyright (c) 2005 Silicon Graphics, Inc.  All Rights Reserved.
# 
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
# 
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# for more details.
# 
# Start or Stop the Performance Co-Pilot (PCP) daemon manager
#
# The following is for chkconfig on RedHat based systems
# chkconfig: 2345 95 05
# description: pmmgr is a daemon manager for the Performance Co-Pilot (PCP)
#
# The following is for insserv(1) based systems,
# e.g. SuSE, where chkconfig is a perl script.
### BEGIN INIT INFO
# Provides:       pmmgr
# Required-Start: $remote_fs
# Should-Start: $local_fs $network $syslog $time $pmcd
# Required-Stop: $remote_fs
# Should-Stop:  $local_fs $network $syslog $pmcd
# Default-Start:  2 3 4 5
# Default-Stop:   0 1 6
# Short-Description: Control pmmgr (daemon manager for PCP)
# Description:       Configure and control pmmgr (a daemon manager for the Performance Co-Pilot)
### END INIT INFO

. $PCP_DIR/etc/pcp.env
. $PCP_SHARE_DIR/lib/rc-proc.sh

PMMGR=$PCP_BINADM_DIR/pmmgr
PMMGROPTS=$PCP_PMMGROPTIONS_PATH
RUNDIR=$PCP_LOG_DIR/pmmgr
pmprog=$PCP_RC_DIR/pmmgr
prog=$PCP_RC_DIR/`basename $0`

tmp=`mktemp -d /var/tmp/pcp.XXXXXXXXX` || exit 1
status=1
trap "rm -rf $tmp; exit \$status" 0 1 2 3 15

if [ $pmprog = $prog ]
then
    VERBOSE_CTL=on
else
    VERBOSE_CTL=off
fi

case "$PCP_PLATFORM"
in
    mingw)
	# nothing we can usefully do here, skip the test
	#
	;;

    *)
	# standard Unix/Linux style test
	#
	ID=id
	test -f /usr/xpg4/bin/id && ID=/usr/xpg4/bin/id

	IAM=`$ID -u 2>/dev/null`
	if [ -z "$IAM" ]
	then
	    # do it the hardway
	    #
	    IAM=`$ID | sed -e 's/.*uid=//' -e 's/(.*//'`
	fi
	;;
esac

_shutdown()
{
    # Is pmmgr running?
    #
    _get_pids_by_name pmmgr >$tmp/tmp
    if [ ! -s $tmp/tmp ]
    then
	[ "$1" = verbose ] && echo "$pmprog: pmmgr not running"
	return 0
    fi

    # Send pmmgr a SIGTERM, which is noted as a pending shutdown.
    # When finished the currently active request, pmmgr will close any
    # connections and then exit.
    # Wait for pmmgr to terminate.
    #
    pmsignal -p -s TERM pmmgr > /dev/null 2>&1
    $ECHO $PCP_ECHO_N "Waiting for pmmgr to terminate ...""$PCP_ECHO_C"
    gone=0
    for i in 1 2 3 4 5 6
    do
	sleep 3
	_get_pids_by_name pmmgr >$tmp/tmp
	if [ ! -s $tmp/tmp ]
	then
	    gone=1
	    break
	fi

	# If pmmgr doesn't go in 15 seconds, SIGKILL and sleep 1 more time
	# to allow any clients reading from pmmgr sockets to fail so that
	# socket doesn't end up in TIME_WAIT or somesuch.
	#
	if [ $i = 5 ]
	then
	    $ECHO
	    echo "Process ..."
	    $PCP_PS_PROG $PCP_PS_ALL_FLAGS >$tmp/ps
	    sed 1q $tmp/ps
	    for pid in `cat $tmp/tmp`
	    do
		$PCP_AWK_PROG <$tmp/ps "\$2 == $pid { print }"
	    done
	    echo "$prog: Warning: Forcing pmmgr to terminate!"
	    pmsignal -a -s KILL pmmgr > /dev/null 2>&1
	else
	    $ECHO $PCP_ECHO_N ".""$PCP_ECHO_C"
	fi
    done
    if [ $gone != 1 ]	# It just WON'T DIE, give up.
    then
	echo "Process ..."
	cat $tmp/tmp
	echo "$prog: Warning: pmmgr won't die!"
	exit
    fi
    $RC_STATUS -v 
    pmpost "stop pmmgr from $pmprog"
}

_usage()
{
    echo "Usage: $pmprog [-v] {start|restart|condrestart|stop|status|reload|force-reload}"
}

while getopts v c
do
    case $c
    in
	v)  # force verbose
	    VERBOSE_CTL=on
	    ;;
	
	*)
	    _usage
	    exit 1
	    ;;
    esac
done
shift `expr $OPTIND - 1`

if [ $VERBOSE_CTL = on ]
then				# For a verbose startup and shutdown
    ECHO=$PCP_ECHO_PROG
else				# For a quiet startup and shutdown
    ECHO=:
fi

if [ "$IAM" != 0 -a "$1" != "status" ]
then
    if [ -n "$PCP_DIR" ]
    then
	: running in a non-default installation, do not need to be root
    else
	echo "$prog:"'
Error: You must be root (uid 0) to start or stop the PCP pmmgr daemon.'
	exit
    fi
fi

# First reset status of this service
$RC_RESET
 
# Return values acc. to LSB for all commands but status:
# 0 - success
# 1 - misc error
# 2 - invalid or excess args
# 3 - unimplemented feature (e.g. reload)
# 4 - insufficient privilege
# 5 - program not installed
# 6 - program not configured
#
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signalling is not supported) are
# considered a success.
case "$1" in

  'start'|'restart'|'condrestart'|'reload'|'force-reload')
	if [ "$1" = "condrestart" ] && ! is_chkconfig_on pmmgr
	then
	    status=0
	    exit
	fi

	_shutdown quietly

	# pmmgr messages should go to stderr, not the GUI notifiers
	#
	unset PCP_STDERR

	if [ -x $PMMGR ]
	then
	    if [ ! -f $PMMGROPTS ]
	    then
		echo "$prog:"'
Error: pmmgr control file "$PMMGROPTS" is missing, cannot start pmmgr.'
		exit
	    fi
	    # create directory housing daemon pid file
	    if [ ! -d "$PCP_RUN_DIR" ]
	    then
		mkdir -p -m 775 "$PCP_RUN_DIR"
		chown $PCP_USER:$PCP_GROUP "$PCP_RUN_DIR"
	    fi
	    # create directory which will serve as cwd
	    if [ ! -d "$RUNDIR" ]
	    then
		mkdir -p -m 775 "$RUNDIR"
		chown $PCP_USER:$PCP_GROUP "$RUNDIR"
	    fi
	    cd $RUNDIR

	    # salvage the previous versions of any pmmgr
	    #
	    if [ -f pmmgr.log ]
	    then
		rm -f pmmgr.log.prev
		mv pmmgr.log pmmgr.log.prev
	    fi

	    $ECHO $PCP_ECHO_N "Starting pmmgr ..." "$PCP_ECHO_C"
	    # options file processing ...
	    # only consider lines which start with a hyphen
	    # get rid of the -f option
	    # ensure multiple lines concat onto 1 line
	    OPTS=`sed <$PMMGROPTS 2>/dev/null \
			    -e '/^[^-]/d' \
			    -e 's/^/ /' \
			    -e 's/$/ /' \
			    -e 's/ -f / /g' \
			    -e 's/^ //' \
			    -e 's/ $//' \
		    | tr '\012' ' ' `
 
	    # environment stuff
	    #
	    eval `sed -e 's/"/\\"/g' $PMMGROPTS \
	    | awk -F= '
BEGIN			{ exports="" }
/^[A-Z]/ && NF == 2	{ exports=exports" "$1
			  printf "%s=${%s:-\"%s\"}\n", $1, $1, $2
			}
END			{ if (exports != "") print "export", exports }'`

	    $PMMGR -l pmmgr.log $OPTS &
	    $RC_STATUS -v

	    pmpost "start pmmgr from $pmprog"

	    # finally, stop here if running in a container
	    [ -z "$PCP_CONTAINER_IMAGE" ] || exec $PCP_BINADM_DIR/pmpause
	fi
	status=0
        ;;

  'stop')
	_shutdown
	status=0
        ;;

  'status')
	# NOTE: $RC_CHECKPROC returns LSB compliant status values.
	$ECHO $PCP_ECHO_N "Checking for pmmgr:" "$PCP_ECHO_C"
        if [ -r /etc/rc.status ]
        then
            # SuSE
            $RC_CHECKPROC $PMMGR
            $RC_STATUS -v
            status=$?
        else
            # not SuSE
            $RC_CHECKPROC $PMMGR
            status=$?
            if [ $status -eq 0 ]
            then
                $ECHO running
            else
                $ECHO stopped
            fi
        fi
	;;

  *)
	[ -z "$PCP_CONTAINER_IMAGE" ] || exec "$@"
	_usage
        ;;
esac

