esm

apt_esm.py

#!/usr/bin/python3

import apt
import apt_pkg


def list_esm_package_updates():
    """ Find updates which you can install if you enable ESM. """
    cache: apt.Cache = apt.Cache()

    for pkg in cache:
        found: bool = False

        if not pkg.is_installed:
            continue

        candidate: apt.Version = pkg.candidate

        # ok, now it's installed, look at the updates
        for v in pkg.versions:
            if (
                v.policy_priority > -32768
            ):  # this is not a Pin-Priority: never ESM update
                continue

            if (
                v == candidate
            ):  # we're only interested in versions that we can't upgrade to
                continue

            if (
                apt_pkg.version_compare(v.version, pkg.installed.version) < 0
            ):  # an older version, such as when we've installed an SRU
                continue

            for origin in v.origins:
                if origin.archive and origin.origin.startswith("UbuntuESM"):
                    print(
                        f"{v.package.shortname} is available in {origin.origin}, which is not enabled."
                    )
                    found = True
                    break

            if found:
                break


if __name__ == "__main__":
    list_esm_package_updates()