Validating Confdir

In its MAIN function, Validate first sets the CONFDIR variable to the empty string and UPDATE_PROPERTY and CONFDIR_FOUND to 0.

CONFDIR=""
UPDATE_PROPERTY=0
CONFDIR_FOUND=0

Validate calls parse_args() to parse the arguments that are passed by the RGM.

parse_args “$@”

Validate checks if Validate is being called as the result of an update of properties. Validate also checks if the Confdir extension property was on the command line. Validate verifies that the Confdir property has a value, and if not, exits with failure status and an error message.

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

Specifically, the preceding code checks if Validate is being called as the result of an update ($UPDATE_PROPERTY == 1) and if the property was not found on the command line (CONFDIR_FOUND == 0). In this case, the code retrieves the existing value of Confdir by using scha_resource_get(). If Confdir was found on the command line (CONFDIR_FOUND == 1), the value of CONFDIR comes from the parse_args() function, not from scha_resource_get().

The Validate method uses the value of CONFDIR to verify that the directory is accessible. If the directory is not accessible, Validate logs an error message and exits with error status.

# 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

Before validating the update of the Confdir property, Validate performs a final check to verify that the named.conf file is present. If the file is not present, the method logs an error message and exits with error status.

# 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

If the final check is passed, Validate logs a message that indicates success and exits with success status.

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

exit 0