#!/usr/bin/env python



import sys
import os
from lxml import etree as ET

##
# The location of the RelaxNG schema.
#
EUCALYPTUS_RSPEC_SCHEMA = 'eucalyptus.rng'


def main():
    with open(sys.argv[1], 'r') as f:
        xml = f.read()
        schemaXML = ET.parse(EUCALYPTUS_RSPEC_SCHEMA)
        rspecValidator = ET.RelaxNG(schemaXML)
        rspecXML = ET.XML(xml)
        if not rspecValidator(rspecXML):
            error = rspecValidator.error_log.last_error
            message = '%s (line %s)' % (error.message, error.line)
            print(message)
        else:
            print('It is valid')

if __name__ == "__main__":
    main()