#!/bin/ksh
#
# ident	"@(#)pprosched.sh	1.4	04/03/14 SMI"
#
# Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
PRG=$0

usage() {
	echo "usage: $PRG [<filename>| -r <command>]"
	exit 1;
}

#
# This returns a string with no dangerous characters in it
#
benignString() {
    echo ${1#*/} | sed s@/@\\\\/@g
}

#
# Remove from crontab the command
#
removeFromCrontab() {
   command=$1
   echo Removing from crontab $command
#  copy the user's crontab file to /tmp
   crontab -l > ${userfile}

#  command is an absolute path
   pproCmd="${command}"

#  determine if the command is already in /tmp/userfile
   if grep "${pproCmd}" ${userfile} > /dev/null 2>&1
   then
#      remove the command command
       echo "Updating cron to remove $pproCmd ... "
       sed /"${pproCmd}"/d ${userfile}  > ${userfile}.bak
       crontab ${userfile}.bak
       rm -f ${userfile}.bak
   fi

   rm -f ${userfile}

   exit 0   
}


#
# Confirm that the user is root.
#
confirmRoot() {
	Uid=`id | sed 's/uid=\([0-9]*\)(.*/\1/'`
	if [ $Uid -ne 0 ]; then
		echo ${NOTROOTERR}
		exit 1
	fi
}

#
# Main routine
#
numofarg=$#

if [[ $numofarg -lt 1 ]]; then
   echo "Incorrect arguments"
   usage
   exit 1
fi

username=`whoami`
usercrontabdir=/var/spool/cron/crontabs/
userfile=/tmp/${username}crontab$$.tmp
usercrontabfile=${usercrontabdir}${username}

# determine if its the -r option
# to remove command from crontab
if [[ $1 = "-r" ]];
then
   shift
   removeFromCrontab "$*"
fi

commandfile=$1

# determine if the file containing exists 
if [[ ! -a $commandfile ]];
then
   echo "Error cannot find file : $commandfile"
   exit 1
fi

# determine if user has crontab file
if [[ -s ${usercrontabfile} ]];
then
#   user has crontab file
#   count number of rows in commandfile
    numOfRows=`egrep -c '^.*$' "$commandfile"`

#   the most numof rows in a command file 
#   is 2.
    if [[ $numOfRows -le 2 ]];
    then

#       copy the user's crontab file to /tmp
        crontab -l > ${userfile}

#       determine if users crontab file
#       contains the command
#       retrieves the command in first line
        linecommand=`awk -F 'NR==1' "$commandfile"`

#       eliminates the min, hour, dayOfMonth, month, dayOfWeek field 
        command=`echo "${linecommand}" | 
                  nawk '{$1="";$2="";$3="";$4="";$5="";print }'"`
#       command is an absolute path with option

        pproCmd="$(benignString "${command}")"

#       determine if the command is already in /tmp/userfile
        if grep "${pproCmd}" ${userfile} > /dev/null 2>&1
        then
#          remove the previous command
           echo "Updating previous cron to new schedule ... "
           sed /"${pproCmd}"/d ${userfile}  > ${userfile}.bak
           sed -n '/^.*$/ p' $commandfile >> ${userfile}.bak  
           crontab < ${userfile}.bak
           rm -f ${userfile} ${userfile}.bak
        else
#       append this command to the crontab
           echo "Adding new schedule to cron"
           sed -n '/^.*/p' $commandfile >> $userfile
           crontab < $userfile
           rm -f ${userfile}
        fi

    fi
else
#   create the file containing the command 
#   to temporary crontab file 
#    echo ${username} has no scheduled cron
    echo "Adding new schedule to cron"
    sed -n '/^.*$/ p' $commandfile > $userfile  
    crontab < $userfile

    rm -f ${userfile}
fi