Validate Method Code Listing

#!/bin/ksh
# Validate method for HA-DNS.
# This method validates the Confdir property of the resource. The Validate
# method gets called in two scenarios. When the resource is being created and
# when a resource property is getting updated. When the resource is being
# created, this method gets called with the -c flag and all the system-defined
# and extension properties are passed as command-line arguments. When a resource
# property is being updated, the Validate method gets called with the -u flag,
# and only the property/value pair of the property being updated is passed as a
# command-line argument. 
#
# ex: When the resource is being created command args will be
#   
# dns_validate -c -R <..> -G <...> -T <..> -r <sysdef-prop=value>...
#       -x <extension-prop=value>.... -g <resourcegroup-prop=value>....
#
# when the resource property is being updated
#
# dns_validate -u -R <..> -G <...> -T <..> -r <sys-prop_being_updated=value>
#   OR
# dns_validate -u -R <..> -G <...> -T <..> -x <extn-prop_being_updated=value>

#pragma ident   “@(#)dns_validate   1.1   00/05/24 SMI”

###############################################################################
# Parse program arguments.
#
function parse_args # [args ...]
{
   typeset opt

   while getopts `cur:x:g:R:T:G:' opt
   do
                case “$opt” in
                R)
                        # Name of the DNS resource.
                        RESOURCE_NAME=$OPTARG
                        ;;
                G)
                        # Name of the resource group in which the resource is
                        # configured.
                        RESOURCEGROUP_NAME=$OPTARG
                        ;;
                T)
                        # Name of the resource type.
                        RESOURCETYPE_NAME=$OPTARG
                        ;;
                r)      
                        #The method is not accessing any system defined 
                        #properties, so this is a no-op.
                        ;;
                g)
                        # The method is not accessing any resource group 
                        # properties, so this is a no-op.
                        ;;
                c)
                        # Indicates the Validate method is being called while
                        # creating the resource, so this flag is a no-op.
                        ;;
                u)
                        # Indicates the updating of a property when the 
                        # resource already exists. If the update is to the
                        # Confdir property then Confdir should appear in the
                        # command-line arguments. If it does not, the method must
                        # look for it specifically using scha_resource_get.
                        UPDATE_PROPERTY=1
                        ;;
                x)
                        # Extension property list. Separate the property and
                        # value pairs using “=” as the separator.
                        PROPERTY=`echo $OPTARG | awk -F= `{print $1}'`
                        VAL=echo $OPTARG | awk -F= `{print $2}'`

                        # If the Confdir extension property is found on the
                        # command line, note its value.
                        if [ $PROPERTY == “Confdir” ];
                        then
                        CONFDIR=$VAL
                        CONFDIR_FOUND=1
                        fi
                        ;;
                *)
                        logger -p ${SYSLOG_FACILITY}.err \
                        -t [$SYSLOG_TAG] \
                        “ERROR: Option $OPTARG unknown”
                        exit 1
                        ;;
                esac
   done
}

###############################################################################
# MAIN
#
###############################################################################

export PATH=/bin:/usr/bin:/usr/cluster/bin:/usr/sbin:/usr/proc/bin:$PATH

# Obtain the syslog facility to use to log messages.
SYSLOG_FACILITY=`scha_cluster_get -O SYSLOG_FACILITY`

# Set the Value of CONFDIR to null. Later, this method retrieves the value
# of the Confdir property from the command line or using scha_resource_get.
CONFDIR=””
UPDATE_PROPERTY=0
CONFDIR_FOUND=0

# Parse the arguments that have been passed to this method.
parse_args “$@”

# If the validate method is being called due to the updating of properties 
# try to retrieve the value of the Confdir extension property from the command
# line. Otherwise, obtain the value of Confdir using scha_resource_get.
if ( (( $UPDATE_PROPERTY == 1 )) &&  (( CONFDIR_FOUND == 0 )) ); then
   config_info=scha_resource_get -O Extension -R $RESOURCE_NAME \
       -G $RESOURCEGROUP_NAME Confdir`
   CONFDIR=`echo $config_info | awk `{print $2}'`
fi

# Verify that the Confdir property has a value. If not there is a failure
# and exit with status 1.
if [[ -z $CONFDIR ]]; then
   logger -p ${SYSLOG_FACILITY}.err \
       “${ARGV0} Validate method for resource “$RESOURCE_NAME “ failed”
   exit 1
fi

# Now validate the actual Confdir property value. 

# Check if $CONFDIR is accessible.
if [ ! -d $CONFDIR ]; then
        logger -p ${SYSLOG_FACILITY}.err -t [$SYSLOG_TAG] \
            “${ARGV0} Directory $CONFDIR missing or not mounted”
        exit 1
fi

# Check that the named.conf file is present in the Confdir directory.
if [ ! -s $CONFDIR/named.conf ]; then
        logger -p ${SYSLOG_FACILITY}.err -t [$SYSLOG_TAG] \
            “${ARGV0} File $CONFDIR/named.conf is missing or empty”
        exit 1
fi

# Log a message indicating that the Validate method was successful.
logger -p ${SYSLOG_FACILITY}.info -t [$SYSLOG_TAG] \
   “${ARGV0} Validate method for resource “$RESOURCE_NAME \
   “ completed successfully”

exit 0