Yum update checker with severities RHEL/CentOS/Fedora

yum_update_report.sh

#!/bin/bash
#####
## Author: [email protected]
## Dept: Consulting/Infrastructure
## Detail: Script to check updates and their severity 
## Example: yum_update_report.sh -s Moderate
#####

function validations ()
{
	SEVERITY=$1

	case "${SEVERITY}" in
		All|all)			COMMAND="yum updateinfo list"
									;;

		Critical|critical)		COMMAND="yum updateinfo list --security --sec-severity=Critical"
									;;

		Important|important)		COMMAND="yum updateinfo list --security --sec-severity=Important"
									;;

		Moderate|moderate)	  	COMMAND="yum updateinfo list --security --sec-severity=Moderate"
									;;

		Bugfix|bugfix)			COMMAND="yum updateinfo list --bugfix"
									;;

		Enhancement|enhancement)	COMMAND="yum updateinfo list | grep enhancement"
									;;
	esac
}

function check_updates ()
{
	$COMMAND
}

function export ()
{
	$COMMAND | awk '{print $3}' | grep `uname -m` > /tmp/yum_pending_updates.log
}

function usage ()
{
cat <<EOF
usage: $0 options
 
OPTIONS:
	-s   Severity: All, Critical, Important, Moderate, Bugfix, Enhancement
	-h   Show Help
EOF
}
 
## Main
while getopts "s:n:ha" OPTION
do
    case $OPTION in
        h)
            usage
            exit
            ;;
        s)
            SEVERITY=$OPTARG
            ;;
        ?)
            usage
            exit
            ;;
    esac
done
 
if [[ -z $SEVERITY ]] 
then
    usage
    exit 1
else
	validations $SEVERITY
    check_updates
fi

On my Centos 6.x it always ignores the severity and includes all security updates.
Seems to be a problem with yum-plugin-security. The only error message I've spotted is:
Severity "Important" not found applicable for this system

But a point to note is that all my systems have been configured with Spacewalk (yum prints "This system is receiving updates from RHN Classic or Red Hat Satellite.") maybe it doesn't pass severities.