convert GNS3 v2.2 project files to v2.1.21

convert_gns3project_version.py

#!/usr/bin/env python3

import json
from sys import stderr, argv


def process(topoplogy):
    del topoplogy["drawing_grid_size"]
    topoplogy["revision"] = 8
    topoplogy["version"] = "2.1.21"
    for node in topoplogy["topology"]["nodes"]:
        del node["console_auto_start"]
        del node["custom_adapters"]
        del node["locked"]
        del node["template_id"]
        if "usage" in node["properties"]:
            del node["properties"]["usage"]
        if "extra_volumes" in node["properties"]:
            del node["properties"]["extra_volumes"]
    return topoplogy


def read_gns3(addr):
    with open(addr) as f:
        return json.load(f)


def write_gns3(topoplogy, addr):
    with open(addr, "w") as f:
        json.dump(topoplogy, f, indent=4)


def main():
    if len(argv) < 2:
        print("usage:\t%s <project.gns3>" % argv[0], file=stderr)
        exit(2)
    topoplogy = read_gns3(argv[1])
    topoplogy = process(topoplogy)
    write_gns3(topoplogy, argv[1])


if __name__ == '__main__':
    main()