files/node-classifier.py


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#!/usr/bin/env python3

import yaml
import sys
import configparser

# https://puppet.com/docs/puppet/7/nodes_external.html


def main(args):
    if len(args) == 1:
        print('usage ./node-classifier <node-name>')
        return

    parser = configparser.ConfigParser()
    conf_file = '/etc/node-classifier.ini'
    if parser.read(conf_file) != [conf_file]:
        print(f'Configuration file missing, expected {conf_file}')
        return 1

    try:
        fmt = parser.get('common', 'node_fmt')
        if fmt != 'yaml':
            print(f'Unknown format {fmt}')
            return 1
        filename = parser.get('common', 'nodes')
    except configparser.NoSectionError as e:
        print(e)
        return 1
    except NoOptionError as e:
        print(e)
        return 1

    with open(filename) as f:
        data = yaml.load(f)

    nodename = sys.argv[1]
    instance = data.get(nodename)
    if not instance:
        instance = data.get('default')
    print(yaml.dump(instance))

if __name__ == '__main__':
    sys.exit(main(sys.argv))