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Mini Shell
Mini Shell
import logging
from typing import Any, Dict, Optional, Tuple
from uaclient import (
api,
event_logger,
exceptions,
http,
livepatch,
messages,
snap,
system,
util,
)
from uaclient.entitlements.base import EntitlementWithMessage, UAEntitlement
from uaclient.entitlements.entitlement_status import ApplicationStatus
from uaclient.types import StaticAffordance
LIVEPATCH_RETRIES = [0.5, 1.0]
ERROR_MSG_MAP = {
"Unknown Auth-Token": "Invalid Auth-Token provided to livepatch.",
"unsupported kernel": "Your running kernel is not supported by Livepatch.",
}
event = event_logger.get_event_logger()
LOG = logging.getLogger(util.replace_top_level_logger_name(__name__))
class LivepatchEntitlement(UAEntitlement):
help_doc_url = messages.urls.LIVEPATCH_HOME_PAGE
name = "livepatch"
title = messages.LIVEPATCH_TITLE
description = messages.LIVEPATCH_DESCRIPTION
help_text = messages.LIVEPATCH_HELP_TEXT
affordance_check_kernel_min_version = False
affordance_check_kernel_flavor = False
# we do want to check series because livepatch errors on non-lts releases
affordance_check_series = True
# we still need to check arch because the livepatch-client is not built
# for all arches
affordance_check_arch = True
@property
def incompatible_services(self) -> Tuple[EntitlementWithMessage, ...]:
from uaclient.entitlements.fips import FIPSEntitlement
from uaclient.entitlements.realtime import RealtimeKernelEntitlement
return (
EntitlementWithMessage(
FIPSEntitlement, messages.LIVEPATCH_INVALIDATES_FIPS
),
EntitlementWithMessage(
RealtimeKernelEntitlement,
messages.REALTIME_LIVEPATCH_INCOMPATIBLE,
),
)
@property
def static_affordances(self) -> Tuple[StaticAffordance, ...]:
# Use a lambda so we can mock system.is_container in tests
from uaclient.entitlements.fips import FIPSEntitlement
fips_ent = FIPSEntitlement(self.cfg)
is_fips_enabled = bool(
fips_ent.application_status()[0] == ApplicationStatus.ENABLED
)
return (
(
messages.SERVICE_ERROR_INSTALL_ON_CONTAINER.format(
title=self.title
),
lambda: system.is_container(),
False,
),
(
messages.LIVEPATCH_ERROR_WHEN_FIPS_ENABLED,
lambda: is_fips_enabled,
False,
),
)
def enable_steps(self) -> int:
return 2
def disable_steps(self) -> int:
return 1
def _perform_enable(self, progress: api.ProgressWrapper) -> bool:
"""Enable specific entitlement.
@return: True on success, False otherwise.
"""
progress.progress(messages.INSTALLING_LIVEPATCH)
if not snap.is_snapd_installed():
progress.emit(
"info", messages.INSTALLING_PACKAGES.format(packages="snapd")
)
snap.install_snapd()
if not snap.is_snapd_installed_as_a_snap():
progress.emit(
"info",
messages.INSTALLING_PACKAGES.format(packages="snapd snap"),
)
try:
snap.install_snap("snapd")
except exceptions.ProcessExecutionError as e:
LOG.warning("Failed to install snapd as a snap", exc_info=e)
progress.emit(
"info",
messages.EXECUTING_COMMAND_FAILED.format(
command="snap install snapd"
),
)
snap.run_snapd_wait_cmd(progress)
try:
snap.refresh_snap("snapd")
except exceptions.ProcessExecutionError as e:
LOG.warning("Failed to refresh snapd snap", exc_info=e)
event.info(
messages.EXECUTING_COMMAND_FAILED.format(
command="snap refresh snapd"
)
)
http_proxy = http.validate_proxy(
"http", self.cfg.http_proxy, http.PROXY_VALIDATION_SNAP_HTTP_URL
)
https_proxy = http.validate_proxy(
"https", self.cfg.https_proxy, http.PROXY_VALIDATION_SNAP_HTTPS_URL
)
snap.configure_snap_proxy(
http_proxy=http_proxy,
https_proxy=https_proxy,
retry_sleeps=snap.SNAP_INSTALL_RETRIES,
)
if not livepatch.is_livepatch_installed():
progress.emit(
"info",
messages.INSTALLING_PACKAGES.format(
packages="canonical-livepatch snap"
),
)
try:
snap.install_snap("canonical-livepatch")
except exceptions.ProcessExecutionError as e:
raise exceptions.ErrorInstallingLivepatch(error_msg=str(e))
livepatch.configure_livepatch_proxy(http_proxy, https_proxy)
return self.setup_livepatch_config(
progress, process_directives=True, process_token=True
)
def setup_livepatch_config(
self,
progress: api.ProgressWrapper,
process_directives: bool = True,
process_token: bool = True,
) -> bool:
"""Processs configuration setup for livepatch directives.
:param process_directives: Boolean set True when directives should be
processsed.
:param process_token: Boolean set True when token should be
processsed.
"""
progress.progress(messages.SETTING_UP_LIVEPATCH)
entitlement_cfg = self.cfg.machine_token_file.entitlements.get(
self.name
)
if process_directives:
try:
process_config_directives(entitlement_cfg)
except exceptions.ProcessExecutionError as e:
LOG.error(str(e), exc_info=e)
progress.emit(
"info",
messages.LIVEPATCH_UNABLE_TO_CONFIGURE.format(
error_msg=str(e)
),
)
return False
if process_token:
livepatch_token = entitlement_cfg.get("resourceToken")
if not livepatch_token:
LOG.debug(
"No specific resourceToken present. Using machine token as"
" %s credentials",
self.title,
)
livepatch_token = self.cfg.machine_token["machineToken"]
application_status, _details = self.application_status()
if application_status != ApplicationStatus.DISABLED:
LOG.info("Disabling livepatch before re-enabling")
progress.emit("info", messages.LIVEPATCH_DISABLE_REATTACH)
try:
system.subp([livepatch.LIVEPATCH_CMD, "disable"])
except exceptions.ProcessExecutionError as e:
LOG.error(str(e), exc_info=e)
return False
try:
system.subp(
[livepatch.LIVEPATCH_CMD, "enable", livepatch_token],
capture=True,
)
except exceptions.ProcessExecutionError as e:
msg = messages.LIVEPATCH_UNABLE_TO_ENABLE
for error_message, print_message in ERROR_MSG_MAP.items():
if error_message in str(e):
msg += print_message
break
if msg == messages.LIVEPATCH_UNABLE_TO_ENABLE:
msg += str(e)
progress.emit("info", msg)
return False
return True
def _perform_disable(self, progress: api.ProgressWrapper):
"""Disable specific entitlement
@return: True on success, False otherwise.
"""
if not livepatch.is_livepatch_installed():
return True
cmd = [livepatch.LIVEPATCH_CMD, "disable"]
progress.progress(
messages.EXECUTING_COMMAND.format(command=" ".join(cmd))
)
system.subp(cmd, capture=True)
return True
def application_status(
self,
) -> Tuple[ApplicationStatus, Optional[messages.NamedMessage]]:
status = (ApplicationStatus.ENABLED, None)
if not livepatch.is_livepatch_installed():
return (ApplicationStatus.DISABLED, messages.LIVEPATCH_NOT_ENABLED)
try:
livepatch_status = livepatch.status()
except exceptions.ProcessExecutionError as e:
return (
ApplicationStatus.WARNING,
messages.LIVEPATCH_CLIENT_FAILURE_WARNING.format(
livepatch_error=e.stderr,
),
)
if livepatch_status is None:
# TODO(May want to parse INACTIVE/failure assessment)
return (
ApplicationStatus.DISABLED,
messages.LIVEPATCH_APPLICATION_STATUS_CLIENT_FAILURE,
)
return status
def enabled_warning_status(
self,
) -> Tuple[bool, Optional[messages.NamedMessage]]:
support = livepatch.on_supported_kernel()
if support == livepatch.LivepatchSupport.UNSUPPORTED:
kernel_info = system.get_kernel_info()
return (
True,
messages.LIVEPATCH_KERNEL_NOT_SUPPORTED.format(
version=kernel_info.uname_release,
arch=kernel_info.uname_machine_arch,
),
)
if support == livepatch.LivepatchSupport.KERNEL_EOL:
kernel_info = system.get_kernel_info()
return (
True,
messages.LIVEPATCH_KERNEL_EOL.format(
version=kernel_info.uname_release,
arch=kernel_info.uname_machine_arch,
),
)
if support == livepatch.LivepatchSupport.KERNEL_UPGRADE_REQUIRED:
return (
True,
messages.LIVEPATCH_KERNEL_UPGRADE_REQUIRED,
)
# if on_supported_kernel returns UNKNOWN we default to no warning
# because there would be no way for a user to resolve the warning
return False, None
def status_description_override(self):
if (
livepatch.on_supported_kernel()
== livepatch.LivepatchSupport.UNSUPPORTED
and not system.is_container()
):
return messages.LIVEPATCH_KERNEL_NOT_SUPPORTED_DESCRIPTION
return None
def process_contract_deltas(
self,
orig_access: Dict[str, Any],
deltas: Dict[str, Any],
allow_enable: bool = False,
) -> bool:
"""Process any contract access deltas for this entitlement.
:param orig_access: Dictionary containing the original
resourceEntitlement access details.
:param deltas: Dictionary which contains only the changed access keys
and values.
:param allow_enable: Boolean set True if allowed to perform the enable
operation. When False, a message will be logged to inform the user
about the recommended enabled service.
:return: True when delta operations are processed; False when noop.
"""
if super().process_contract_deltas(orig_access, deltas, allow_enable):
return True # Already processed parent class deltas
delta_entitlement = deltas.get("entitlement", {})
process_enable_default = delta_entitlement.get("obligations", {}).get(
"enableByDefault", False
)
if process_enable_default:
enable_success, _ = self.enable(api.ProgressWrapper())
return enable_success
application_status, _ = self.application_status()
if application_status == ApplicationStatus.DISABLED:
return False # only operate on changed directives when ACTIVE
delta_directives = delta_entitlement.get("directives", {})
supported_deltas = set(["caCerts", "remoteServer"])
process_directives = bool(
supported_deltas.intersection(delta_directives)
)
process_token = bool(deltas.get("resourceToken", False))
if any([process_directives, process_token]):
LOG.info(
"New livepatch directives or token. running "
"setup_livepatch_config"
)
event.info(
messages.SERVICE_UPDATING_CHANGED_DIRECTIVES.format(
service=self.name
)
)
return self.setup_livepatch_config(
progress=api.ProgressWrapper(),
process_directives=process_directives,
process_token=process_token,
)
return True
def process_config_directives(cfg):
"""Process livepatch configuration directives.
We process caCerts before remoteServer because changing remote-server
in the canonical-livepatch CLI performs a PUT against the new server name.
If new caCerts were required for the new remoteServer, this
canonical-livepatch client PUT could fail on unmatched old caCerts.
@raises: ProcessExecutionError if unable to configure livepatch.
"""
if not cfg:
return
directives = cfg.get("entitlement", {}).get("directives", {})
ca_certs = directives.get("caCerts")
if ca_certs:
system.subp(
[
livepatch.LIVEPATCH_CMD,
"config",
"ca-certs={}".format(ca_certs),
],
capture=True,
)
remote_server = directives.get("remoteServer", "")
if remote_server.endswith("/"):
remote_server = remote_server[:-1]
if remote_server:
system.subp(
[
livepatch.LIVEPATCH_CMD,
"config",
"remote-server={}".format(remote_server),
],
capture=True,
)
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