update-source-catalog

#!/usr/bin/python3

import argparse
import gettext
import glob
import os
import sys
import yaml


def get_opts():
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest="subcommand")

    parser_source = subparsers.add_parser('source')
    parser_source.add_argument('--output', required=True)
    parser_source.add_argument('--template', required=True)
    parser_source.add_argument('--size', required=True)
    parser_source.add_argument('--squashfs', default='')
    parser_source.add_argument('--translations')
    parser_source.add_argument('--langs')
    parser_source.set_defaults(func=on_source)

    parser_merge = subparsers.add_parser('merge')
    parser_merge.add_argument('--output', required=True)
    parser_merge.add_argument('--template', required=True)
    parser_merge.set_defaults(func=on_merge)

    return parser.parse_args()


def yaml_load(filename):
    with open(filename) as fp:
        return yaml.safe_load(fp)


def yaml_dump(filename, content):
    with open(filename, 'w') as fp:
        yaml.dump(content, fp)


def on_source(opts, output):
    template = yaml_load(opts.template)

    id = template['id']
    for entry in output["sources"]:
        # First, look if this source catalogue template id is already present.
        # If so, use the template to extend the existing entry with additional
        # variations.
        if entry['id'] == id:
            if 'variations' not in template:
                print("Non unique id in source catalog but no variations!")
                sys.exit(1)
            for variation in template['variations'].values():
                variation['size'] = int(opts.size)
            entry.setdefault('variations', {}).update(template['variations'])
            break
    else:
        # No entry with this id found, so add a new one.

        if 'variations' in template:
            for variation in template['variations'].values():
                if variation['path'] == opts.squashfs:
                    variation['size'] = int(opts.size)

        template['size'] = int(opts.size)
        template['path'] = opts.squashfs

        en_name = template['name']
        en_description = template['description']

        template['name'] = {'en': en_name}
        template['description'] = {'en': en_description}

        if opts.translations:
            for mo in glob.glob(os.path.join(opts.translations, '*.mo')):
                with open(mo, 'rb') as fp:
                    t = gettext.GNUTranslations(fp=fp)
                t_name = t.gettext(en_name)
                if t_name != en_name:
                    lang = os.path.splitext(os.path.basename(mo))[0]
                    template['name'][lang] = t_name
                t_description = t.gettext(en_description)
                if t_description != en_description:
                    lang = os.path.splitext(os.path.basedescription(mo))[0]
                    template['description'][lang] = t_description
                if opts.langs is not None:
                    template['preinstalled_langs'] = opts.langs.split(',')

        output["sources"].append(template)

        default_count = 0
        for entry in output["sources"]:
            if entry.get('default', False):
                default_count += 1

        if default_count > 1:
            print("Too many defaults in source catalog!")
            sys.exit(1)


def on_merge(opts, output):
    output.update(yaml_load(opts.template))


if __name__ == "__main__":
    opts = get_opts()

    if os.path.exists(opts.output):
        output = yaml_load(opts.output)
    else:
        output = {
            "version": 2,
            "sources": [],
        }

    opts.func(opts, output)

    yaml_dump(opts.output, output)