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Some uaclient operations cannot be fully completed by running a single command. For example, when upgrading uaclient from trusty to xenial, we may have a livepatch change in the contract, allowing livepatch to be enabled on xenial. However, during the upgrade we cannot install livepatch on the system because the running kernel version will not be updated until reboot. Pro client touches a flag file /var/lib/ubuntu-advantage/marker-reboot-cmds-required to indicate this script should run at next boot to process any pending/unresovled config operations. """ import logging import os import sys from uaclient import config, contract, exceptions, lock, messages from uaclient.cli import setup_logging from uaclient.entitlements.fips import FIPSEntitlement from uaclient.system import subp # Retry sleep backoff algorithm if lock is held. # Lock may be held by auto-attach on systems with ubuntu-advantage-pro. SLEEP_ON_LOCK_HELD = 1 MAX_RETRIES_ON_LOCK_HELD = 7 def run_command(cmd, cfg): try: out, _ = subp(cmd.split(), capture=True) logging.debug("Successfully executed cmd: {}".format(cmd)) except exceptions.ProcessExecutionError as exec_error: msg = ( "Failed running cmd: {}\n" "Return code: {}\n" "Stderr: {}\n" "Stdout: {}".format( cmd, exec_error.exit_code, exec_error.stderr, exec_error.stdout ) ) cfg.delete_cache_key("marker-reboot-cmds") logging.warning(msg) sys.exit(1) def fix_pro_pkg_holds(cfg): status_cache = cfg.read_cache("status-cache") if not status_cache: return for service in status_cache.get("services", []): if service.get("name") == "fips": service_status = service.get("status") if service_status == "enabled": ent_cls = FIPSEntitlement logging.debug( "Attempting to remove Ubuntu Pro FIPS package holds" ) entitlement = ent_cls(cfg) try: entitlement.setup_apt_config() # Removes package holds logging.debug( "Successfully removed Ubuntu Pro FIPS package holds" ) except Exception as e: logging.exception(e) logging.warning( "Could not remove Ubuntu PRO FIPS package holds" ) try: entitlement.install_packages(cleanup_on_failure=False) except exceptions.UserFacingError as e: logging.error(e.msg) logging.warning( "Failed to install packages at boot: {}".format( ", ".join(entitlement.packages) ) ) sys.exit(1) cfg.notice_file.remove( "", messages.FIPS_SYSTEM_REBOOT_REQUIRED.msg ) cfg.notice_file.remove("", messages.FIPS_REBOOT_REQUIRED_MSG) def refresh_contract(cfg): try: contract.request_updated_contract(cfg) except exceptions.UrlError as exc: logging.exception(exc) logging.warning(messages.REFRESH_CONTRACT_FAILURE) sys.exit(1) def process_remaining_deltas(cfg): cmd = "/usr/bin/python3 /usr/lib/ubuntu-advantage/upgrade_lts_contract.py" run_command(cmd=cmd, cfg=cfg) cfg.notice_file.remove("", messages.LIVEPATCH_LTS_REBOOT_REQUIRED) def process_reboot_operations(cfg): reboot_cmd_marker_file = cfg.data_path("marker-reboot-cmds") if not cfg.is_attached: logging.debug("Skipping reboot_cmds. Machine is unattached") if os.path.exists(reboot_cmd_marker_file): cfg.delete_cache_key("marker-reboot-cmds") return if os.path.exists(reboot_cmd_marker_file): logging.debug("Running process contract deltas on reboot ...") try: fix_pro_pkg_holds(cfg) refresh_contract(cfg) process_remaining_deltas(cfg) cfg.delete_cache_key("marker-reboot-cmds") cfg.notice_file.remove("", messages.REBOOT_SCRIPT_FAILED) logging.debug("Successfully ran all commands on reboot.") except Exception as e: msg = "Failed running commands on reboot." msg += str(e) logging.error(msg) cfg.notice_file.add("", messages.REBOOT_SCRIPT_FAILED) def main(cfg): """Retry running process_reboot_operations on LockHeldError :raises: LockHeldError when lock still held by auto-attach after retries. UserFacingError for all other errors """ try: with lock.SpinLock( cfg=cfg, lock_holder="ua-reboot-cmds", sleep_time=SLEEP_ON_LOCK_HELD, max_retries=MAX_RETRIES_ON_LOCK_HELD, ): process_reboot_operations(cfg=cfg) except exceptions.LockHeldError as e: logging.warning("Lock not released. %s", str(e.msg)) sys.exit(1) if __name__ == "__main__": cfg = config.UAConfig(root_mode=True) setup_logging(logging.INFO, logging.DEBUG, log_file=cfg.log_file) main(cfg=cfg)