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It will detect any contract deltas between the release before do-release-upgrade and the current release. If we find any differences in the uaclient contract between those releases, we will apply that difference in the upgraded release. For example, suppose we are on Trusty and we are upgrading to Xenial. We found that the apt url for esm services on trusty: https://esm.ubuntu.com/ubuntu While on Xenial, the apt url is: https://esm.ubuntu.com/infra/ubuntu This script will detect differences like that and update the Xenial system to reflect them. """ import logging import sys import time from uaclient.cli import setup_logging from uaclient.config import UAConfig from uaclient.contract import process_entitlements_delta from uaclient.defaults import ESM_APT_ROOTDIR from uaclient.system import ensure_folder_absent, parse_os_release, subp version_to_codename = { "14.04": "trusty", "16.04": "xenial", "18.04": "bionic", "20.04": "focal", "22.04": "jammy", "22.10": "kinetic", } # We consider the past release for LTSs to be the last LTS, # because we don't have any services available on non-LTS. # This makes it safer for us to try to process contract deltas. # For example, we had "jammy": "focal" even when Impish was # still supported. current_codename_to_past_codename = { "xenial": "trusty", "bionic": "xenial", "focal": "bionic", "jammy": "focal", "kinetic": "jammy", } def process_contract_delta_after_apt_lock() -> None: logging.debug("Check whether to upgrade-lts-contract") cfg = UAConfig(root_mode=True) if not cfg.is_attached: logging.debug("Skipping upgrade-lts-contract. Machine is unattached") return out, _err = subp(["lsof", "/var/lib/apt/lists/lock"], rcs=[0, 1]) msg = "Starting upgrade-lts-contract." if out: msg += " Retrying every 10 seconds waiting on released apt lock" print(msg) logging.debug(msg) current_version = parse_os_release()["VERSION_ID"] current_release = version_to_codename.get(current_version) if current_release is None: msg = "Unable to get release codename for version: {}".format( current_version ) print(msg) logging.warning(msg) sys.exit(1) past_release = current_codename_to_past_codename.get(current_release) if past_release is None: msg = "Could not find past release for: {}".format(current_release) print(msg) logging.warning(msg) sys.exit(1) past_entitlements = UAConfig( series=past_release, root_mode=True ).machine_token_file.entitlements new_entitlements = UAConfig( series=current_release, root_mode=True, ).machine_token_file.entitlements retry_count = 0 while out: # Loop until apt hold is released at the end of `do-release-upgrade` time.sleep(10) out, _err = subp(["lsof", "/var/lib/apt/lists/lock"], rcs=[0, 1]) retry_count += 1 msg = "upgrade-lts-contract processing contract deltas: {} -> {}".format( past_release, current_release ) print(msg) logging.debug(msg) process_entitlements_delta( cfg=cfg, past_entitlements=past_entitlements, new_entitlements=new_entitlements, allow_enable=True, series_overrides=False, ) msg = "upgrade-lts-contract succeeded after {} retries".format(retry_count) print(msg) logging.debug(msg) def remove_private_esm_apt_cache(): ensure_folder_absent(ESM_APT_ROOTDIR) if __name__ == "__main__": setup_logging(logging.INFO, logging.DEBUG) process_contract_delta_after_apt_lock() remove_private_esm_apt_cache()