sonic-buildimage/files/scripts/update_chassisdb_config

#!/usr/bin/python3

import argparse
import json
import os
import syslog

database_config_file = "/var/run/redis/sonic-db/database_config.json"
redis_chassis = 'redis_chassis'
chassis_db_list = ['CHASSIS_APP_DB', 'CHASSIS_STATE_DB']


def main():
    parser = argparse.ArgumentParser(description="Update chassis_db config from database-config.json")
    parser.add_argument("-j", "--json", help="databse-config json file", nargs='?',
                        const=database_config_file)
    parser.add_argument("-p", "--port", help="update port number", nargs='?')
    group = parser.add_mutually_exclusive_group()
    group.add_argument("-k", "--keep", help="keep configuration", action='store_true')
    group.add_argument("-d", "--delete", help="delete configuration", action='store_true')

    args = parser.parse_args()
    jsonfile = ""
    if args.json != None:
        jsonfile = args.json
    else:
        return
    if args.port != None:
        port_number = args.port
    else:
        port_number = ""
    if args.keep:
        keep_config = True
    else:
        keep_config = False
    if args.delete:
        delete_config = True
    else:
        delete_config = False
    data = {}
    data_keep = {}
    if os.path.isfile(jsonfile):
        with open(jsonfile, "r") as read_file:
            data = json.load(read_file)
    else:
        syslog.syslog(syslog.LOG_ERR,
                      'config file {} does notexist'.format(jsonfile))
        return
    if 'INSTANCES' in data and redis_chassis in data['INSTANCES']:
       data_keep['INSTANCES'] = {}
       data_keep['INSTANCES'][redis_chassis] = data['INSTANCES'][redis_chassis]
       if delete_config:
           del data['INSTANCES'][redis_chassis]
    for chassis_db in chassis_db_list:
       if 'DATABASES' in data and chassis_db in data['DATABASES']:
           data_keep['DATABASES'] = {}
           data_keep['DATABASES'][chassis_db] = data['DATABASES'][chassis_db]
           if delete_config:
               del data['DATABASES'][chassis_db]

    with open(jsonfile, "w") as write_file:
        data_publish = data_keep if keep_config else data
        if port_number:
            data_publish['INSTANCES']['redis_chassis']['port'] = int(port_number)
        json.dump(data_publish, write_file, indent=4, separators=(',', ': '))
    syslog.syslog(syslog.LOG_INFO,
                  'remove chassis_db from config file {}'.format(jsonfile))


if __name__ == "__main__":
    main()