truenas/library/ix-dev/charts/pihole/upgrade_strategy

#!/usr/bin/python3
import json
import re
import sys

from catalog_update.upgrade_strategy import semantic_versioning


RE_STABLE_VERSION = re.compile(r'\d+\.\d+\.\d+')


def newer_mapping(image_tags):
    key = list(image_tags.keys())[0]
    tags = {t: t for t in image_tags[key] if RE_STABLE_VERSION.fullmatch(t)}
    version = semantic_versioning(list(tags))
    if not version:
        return {}

    parts = version.split('.')
    for idx, val in enumerate(parts):
        if val == '0':
            continue

        if len(val) == 1:
            parts[idx] = '0' + val

    version = '.'.join(parts)

    return {
        'tags': {key: tags[version]},
        'app_version': version,
    }


if __name__ == '__main__':
    try:
        versions_json = json.loads(sys.stdin.read())
    except ValueError:
        raise ValueError('Invalid json specified')

    print(json.dumps(newer_mapping(versions_json)))