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Mini Shell
Mini Shell
import logging
import os
from collections import namedtuple
from enum import Enum
from typing import List
from uaclient import defaults, event_logger, messages, system, util
LOG = logging.getLogger(util.replace_top_level_logger_name(__name__))
event = event_logger.get_event_logger()
NoticeFileDetails = namedtuple(
"NoticeFileDetails", ["order_id", "label", "is_permanent", "message"]
)
class Notice(NoticeFileDetails, Enum):
CONTRACT_EXPIRED = NoticeFileDetails(
label="contract_expired",
order_id="5",
is_permanent=True,
message=messages.CONTRACT_EXPIRED,
)
REBOOT_REQUIRED = NoticeFileDetails(
label="reboot_required",
order_id="10",
is_permanent=False,
message="System reboot required",
)
ENABLE_REBOOT_REQUIRED = NoticeFileDetails(
label="enable_reboot_required",
order_id="11",
is_permanent=False,
message=messages.ENABLE_REBOOT_REQUIRED_TMPL,
)
REBOOT_SCRIPT_FAILED = NoticeFileDetails(
label="reboot_script_failed",
order_id="12",
is_permanent=True,
message=messages.REBOOT_SCRIPT_FAILED,
)
FIPS_REBOOT_REQUIRED = NoticeFileDetails(
label="fips_reboot_required",
order_id="20",
is_permanent=False,
message=messages.FIPS_REBOOT_REQUIRED_MSG,
)
FIPS_SYSTEM_REBOOT_REQUIRED = NoticeFileDetails(
label="fips_system_reboot_required",
order_id="21",
is_permanent=False,
message=messages.FIPS_SYSTEM_REBOOT_REQUIRED,
)
FIPS_INSTALL_OUT_OF_DATE = NoticeFileDetails(
label="fips_install_out_of_date",
order_id="22",
is_permanent=True,
message=messages.FIPS_INSTALL_OUT_OF_DATE,
)
FIPS_DISABLE_REBOOT_REQUIRED = NoticeFileDetails(
label="fips_disable_reboot_required",
order_id="23",
is_permanent=False,
message=messages.FIPS_DISABLE_REBOOT_REQUIRED,
)
FIPS_PROC_FILE_ERROR = NoticeFileDetails(
label="fips_proc_file_error",
order_id="24",
is_permanent=True,
message=messages.FIPS_PROC_FILE_ERROR.tmpl_msg,
)
FIPS_MANUAL_DISABLE_URL = NoticeFileDetails(
label="fips_manual_disable_url",
order_id="25",
is_permanent=True,
message=messages.NOTICE_FIPS_MANUAL_DISABLE_URL,
)
WRONG_FIPS_METAPACKAGE_ON_CLOUD = NoticeFileDetails(
label="wrong_fips_metapackage_on_cloud",
order_id="25",
is_permanent=True,
message=messages.NOTICE_WRONG_FIPS_METAPACKAGE_ON_CLOUD,
)
LIVEPATCH_LTS_REBOOT_REQUIRED = NoticeFileDetails(
label="lp_lts_reboot_required",
order_id="30",
is_permanent=False,
message=messages.LIVEPATCH_LTS_REBOOT_REQUIRED,
)
CONTRACT_REFRESH_WARNING = NoticeFileDetails(
label="contract_refresh_warning",
order_id="40",
is_permanent=True,
message=messages.NOTICE_REFRESH_CONTRACT_WARNING,
)
OPERATION_IN_PROGRESS = NoticeFileDetails(
label="operation_in_progress",
order_id="60",
is_permanent=False,
message="Operation in progress: {operation}",
)
AUTO_ATTACH_RETRY_FULL_NOTICE = NoticeFileDetails(
label="auto_attach_retry_full_notice",
order_id="70",
is_permanent=False,
message=messages.AUTO_ATTACH_RETRY_NOTICE,
)
AUTO_ATTACH_RETRY_TOTAL_FAILURE = NoticeFileDetails(
label="auto_attach_total_failure",
order_id="71",
is_permanent=True,
message=messages.AUTO_ATTACH_RETRY_TOTAL_FAILURE_NOTICE,
)
class NoticesManager:
def add(
self,
notice_details: Notice,
description: str,
):
"""Adds a notice file. If the notice is found,
it overwrites it.
:param notice_details: Holds details concerning the notice file.
:param description: The content to be written to the notice file.
"""
if not util.we_are_currently_root():
LOG.warning(
"NoticesManager.add(%s) called as non-root user",
notice_details.value.label,
)
return
directory = (
defaults.NOTICES_PERMANENT_DIRECTORY
if notice_details.value.is_permanent
else defaults.NOTICES_TEMPORARY_DIRECTORY
)
filename = "{}-{}".format(
notice_details.value.order_id, notice_details.value.label
)
system.write_file(
os.path.join(directory, filename),
description,
)
def remove(self, notice_details: Notice):
"""Deletes a notice file.
:param notice_details: Holds details concerning the notice file.
"""
if not util.we_are_currently_root():
LOG.warning(
"NoticesManager.remove(%s) called as non-root user",
notice_details.value.label,
)
return
directory = (
defaults.NOTICES_PERMANENT_DIRECTORY
if notice_details.value.is_permanent
else defaults.NOTICES_TEMPORARY_DIRECTORY
)
filename = "{}-{}".format(
notice_details.value.order_id, notice_details.value.label
)
system.ensure_file_absent(os.path.join(directory, filename))
def _get_notice_file_names(self, directory: str) -> List[str]:
"""Gets the list of notice file names in the given directory.
:param directory: The directory to search for notice files.
:returns: List of notice file names.
"""
return [
file_name
for file_name in os.listdir(directory)
if os.path.isfile(os.path.join(directory, file_name))
and self._is_valid_notice_file(directory, file_name)
]
def _is_valid_notice_file(self, directory: str, file_name: str) -> bool:
"""Checks if the notice file is valid.
:param file_name: The name of the notice file.
:returns: True if the file is valid, False otherwise.
"""
is_permanent_dir = directory == defaults.NOTICES_PERMANENT_DIRECTORY
valid_file_names = {
"{}-{}".format(n.order_id, n.label)
for n in Notice
if n.is_permanent == is_permanent_dir
}
return file_name in valid_file_names
def _get_default_message(self, file_name: str) -> str:
"""Gets the default message for a notice file.
:param file_name: The name of the notice file.
:returns: The default message defined in the enum.
"""
order_id, label = file_name.split("-")
for notice in Notice:
if notice.order_id == order_id and notice.label == label:
return notice.value.message
return ""
def list(self) -> List[str]:
"""Gets all the notice files currently saved.
:returns: List of notice file contents.
"""
notice_directories = (
defaults.NOTICES_PERMANENT_DIRECTORY,
defaults.NOTICES_TEMPORARY_DIRECTORY,
)
notices = []
for notice_directory in notice_directories:
if not os.path.exists(notice_directory):
continue
notice_file_names = self._get_notice_file_names(notice_directory)
for notice_file_name in notice_file_names:
try:
notice_file_contents = system.load_file(
os.path.join(notice_directory, notice_file_name)
)
except PermissionError:
LOG.warning(
"Permission error while reading " + notice_file_name
)
continue
if notice_file_contents:
notices.append(notice_file_contents)
else:
default_message = self._get_default_message(
notice_file_name
)
notices.append(default_message)
notices.sort()
return notices
_notice_cls = None
def get_notice():
global _notice_cls
if _notice_cls is None:
_notice_cls = NoticesManager()
return _notice_cls
def add(notice_details: Notice, **kwargs) -> None:
notice = get_notice()
description = notice_details.message.format(**kwargs)
notice.add(notice_details, description)
def remove(notice_details: Notice) -> None:
notice = get_notice()
notice.remove(notice_details)
def list() -> List[str]:
notice = get_notice()
return notice.list()
Zerion Mini Shell 1.0