#! /bin/sh
#
# ident	"%Z%%M%	%I%	%E% SMI"
#
# Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# This script is used to enable or disable a cron job which
# runs auto analysis at a random time, once a day.
#

#
# control logging method
#
log=echo

command=swupAuto

if [ $1 = "enable" ]; then

    ####################################################################
    #  Create swup agent cron job that runs in auto analysis mode
    ####################################################################
    
    user=root
    
    # set the cron job to run at a random time once a day between 12:00am and 3:59:am
    min=`date +%M`
    hrs=`date +%H`
    
    randhrs=`echo "$hrs % 4" | /usr/bin/bc`
    
    entry="$min $randhrs * * * /usr/lib/patch/swupAuto > /dev/null 2>&1"
    
    tmp_dir="/tmp/swupCron.$$"
    
    if [ ! -d $tmp_dir ] ; then
	/usr/bin/mkdir -m 0755 $tmp_dir
    fi
    
    # a tmp file for crontab entries
    tmp_crontab="$tmp_dir/tmp_crontab.$$"
    
    # see if a crontab exists for the root
    crontab_file="/var/spool/cron/crontabs/$user"
    if [ -f $crontab_file ] ; then
	    # read the existing crontab into a file
	    /usr/bin/crontab -l $user > $tmp_crontab
	    if [ $? -ne 0 ] ; then
		    $log "ERROR: could not get crontab for $user"
                    /usr/bin/rm -rf $tmp_dir
		    exit 1
	    fi
    else
	    # create an empty tmp_crontab
	    /usr/bin/touch $tmp_crontab
    fi
    
    # is there an existing entry? If so, exit the installation with warning
    /usr/bin/fgrep "$command" $tmp_crontab > /dev/null
    if [ $? -eq 0 ] ; then
	    $log "WARNING: root user's crontab has an entry for $command"
            /usr/bin/rm -rf $tmp_dir
	    $log "Exiting the installation with out making changes to the crontab"
	    exit 0
    fi
    
    echo "$entry" >> $tmp_crontab
    
    /usr/bin/crontab $tmp_crontab
    if [ $? -ne 0 ] ; then
	$log "ERROR: crontab could not be updated with an entry for the Inventory agent"
        /usr/bin/rm -rf $tmp_dir
	exit 1
    fi
    
    # remove the cron file
    /usr/bin/rm -rf $tmp_dir
    
    exit 0

elif [ $1 = "disable" ]; then
	#################################################################################
	#  Remove the cron entry for the swup agent that runs in auto analysis mode
	#################################################################################
	
	# create temp dir for manipulation of cron files
	tmp_dir="/tmp/tmp_crons.$$"
	if [ ! -d $tmp_dir ] ; then
	    /usr/bin/mkdir -m 0755 $tmp_dir
	    if [ $? -ne 0 ] ; then
		    $log "ERROR: could not create $tmp_dir"
		    exit 1
	    fi
	fi
	
	# create tmp files of crontab entries
	# old file is before the removal of crontab entry
	# new file is after the removal of crontab entry
	old_crontab="$tmp_dir/old_crontab.$$"
	new_crontab="$tmp_dir/new_crontab.$$"
	
	# read the crontab into this file
	/usr/bin/crontab -l > $old_crontab
	if [ $? -ne 0 ] ; then
	        /usr/bin/rm -rf $tmp_dir
		$log "ERROR: could not get crontab"
		exit 1
	fi
	
	# Find out if there is an entry for the swup Auto agent and if found,
	# remove it.
	
	crontab_entry=`/usr/bin/fgrep "$command" $old_crontab 2>/dev/null`
	
	if [ -n "$crontab_entry" ] ; then
	
	    # edit the data to remove the line with the entry
	
	    /usr/bin/sed /"${command}"/d  $old_crontab > $new_crontab
	    if [ $? -ne 0 ]; then
                    /usr/bin/rm -rf $tmp_dir
		    $log "ERROR: sed edit of crontab file failed"
		    exit 1
	    fi
	    
	    # update the crontab file
	    /usr/bin/crontab $new_crontab
	    #    /usr/bin/su $user -c "/usr/bin/crontab $new_crontab"
	    if [ $? -ne 0 ] ; then
                    /usr/bin/rm -rf $tmp_dir
		    $log "ERROR: installation of edited crontab failed"
		    exit 1
	    fi
	fi
	
	# remove the data directory as it is no longer needed
	/usr/bin/rm -rf $tmp_dir
	
	exit 0

else
    echo "Usage: changeAutoAnalysis disable | enable"
fi