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Mini Shell
Mini Shell
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
import json
import os
import sys
import time
import traceback
from typing import Any, Optional, Dict, NoReturn # NOQA
import psutil
from clcommon import FormattedException
from clcommon.utils import (
run_command,
ExternalProgramFailed,
get_cl_version,
)
from clcommon.utils import get_package_db_errors, is_ubuntu
from clwizard.config import NoSuchModule
from .config import acquire_config_access
from .config import Config # NOQA
from .modules import run_installation, ALL_MODULES, get_supported_modules
from .constants import (
WizardStatus,
ModuleStatus,
CRASH_LOG_PATH,
FILE_MARKER_PATH,
MAIN_LOG_PATH,
)
from .exceptions import CancelModuleException, InstallationFailedException
from .parser import parse_cloudlinux_wizard_opts
from .utils import (
is_background_process_running,
run_background,
setup_logger,
)
class CloudlinuxWizard:
"""Main class for working with Wizard that exposes high level logic."""
# states in which we can remove the module from queue
CANCELLABLE_MODULE_STATUSES = [
ModuleStatus.PENDING,
ModuleStatus.FAILED,
ModuleStatus.CANCELLED,
]
# modules states in which wizard modules can be considered as done
DONE_MODULES_STATUSES = [
ModuleStatus.INSTALLED,
ModuleStatus.CANCELLED,
ModuleStatus.AUTO_SKIPPED,
]
def __init__(self):
self._opts = None
self._supported_modules = get_supported_modules()
self.log = setup_logger("wizard.main", MAIN_LOG_PATH)
def run(self, argv):
"""
CL Wizard main function
:param argv: command line arguments for wizard
:return: None
"""
self._opts = parse_cloudlinux_wizard_opts(argv)
try:
if self._opts.subparser == "install":
self._validate_system()
if self.is_installation_finished() and not self._opts.force:
self._print_result_and_exit(
result="Installation already finished", exit_code=1
)
self._prepare_for_installation()
if self._opts.no_async:
run_installation()
else:
self.run_background_installation(options=self._opts.json_data)
elif self._opts.subparser == "status":
self._validate_system()
if self._opts.initial:
self._get_initial_status()
else:
self._get_modules_statuses()
elif self._opts.subparser == "cancel":
self._cancel_module_installation(self._opts.module)
elif self._opts.subparser == "finish":
self.create_completion_marker()
else:
raise NotImplementedError
if (
self._opts.subparser in ["install", "cancel"]
and self.is_all_modules_installed()
) or (
self._opts.subparser == "finish" and not self.is_all_modules_installed()
):
# Called only once if:
# -- in case of an install: -all modules were installed successfully
# -a module failed during installation,
# but was installed after resuming
# -- in case of cancelling: -a module failed during installation,
# but was canceled by the user and as a result,
# all modules in a 'done' status
# -- in case of finish: -only if user closed the wizard while a module
# had a status other than installed, cancelled or skipped
self.run_collecting_statistics()
self.run_cagefs_force_update()
self._print_result_and_exit()
except FormattedException as err:
self.log.error(
"Got an error while running cloudlinux-wizard, message: '%s'", str(err)
)
self._print_result_and_exit(
result=err.message, context=err.context, details=err.details, exit_code=1
)
except InstallationFailedException:
self._print_result_and_exit(
result="Module installation failed, see the log for more information",
exit_code=1,
)
except Exception as err:
self.log.exception("Unknown error in cloudlinux-wizard, %s", str(err))
self._print_result_and_exit(
result="Unknown error occured, please, try again "
"or contact CloudLinux support if it persists.",
details=traceback.format_exc(),
)
@staticmethod
def is_installation_finished():
# type: () -> bool
return os.path.isfile(FILE_MARKER_PATH)
def create_completion_marker(self):
# type: () -> None
try:
os.mknod(FILE_MARKER_PATH)
self.log.info("Wizard execution complete")
except (OSError, IOError) as err:
self.log.warning(
"Wizard 'finish' command called more than once, error: '%s'", str(err)
)
self._print_result_and_exit(
result="Wizard 'finish' command called more than once", exit_code=1
)
def run_background_installation(self, options=None):
# type: (Optional[Dict]) -> Optional[None]
cmd = sys.argv[:]
cmd.append("--no-async")
with acquire_config_access() as config:
# two processes cannot use config at same time
# so we can safely do check for running process here
if is_background_process_running():
self._print_result_and_exit(
result="Unable to start a new installation because "
"a background task is still working",
exit_code=1,
)
# the only case when options are None is the 'resume' case
if options is not None:
config.set_modules(options)
# worker will not be able to acquire reading lock
# and will wait unless we finally close config file
worker_pid = run_background(cmd).pid
config.worker_pid = worker_pid
self._print_result_and_exit(result="success", pid=worker_pid)
def _validate_system(self):
"""
Check that wizard supports current system
"""
if get_cl_version() is None:
self._print_result_and_exit(
result="Could not identify the CloudLinux version. "
"Restart your system. If you have the same problem again - "
"contact CloudLinux support."
)
def _prepare_for_installation(self):
"""
Prepare the enviroment before performing the installation.
This function updates the package lists if run on Ubuntu, expires Yum
cache when running on RHEL-based systems.
"""
if is_ubuntu():
cmd = ["apt-get", "-q", "update"]
try:
out = run_command(cmd)
self.log.info("apt-get update output:\n%s", out)
except ExternalProgramFailed as err:
self.log.error("Error during apt-get update: '%s'", err, exc_info=err)
else:
cmd = ["yum", "-qy", "clean", "expire-cache"]
try:
out = run_command(cmd)
self.log.info("yum clean expire-cache output:\n%s", out)
except ExternalProgramFailed as err:
self.log.error("Error during yum clean expire-cache: '%s'", err, exc_info=err)
def _get_module_log_path(self, module_name):
"""Get path to module log file"""
return self._supported_modules[module_name].LOG_FILE
def _get_modules_statuses(self):
"""
Get information about background worker state
"""
# we should return modules in order, but config
# does not know about it, let's sort modules here
modules = []
with acquire_config_access() as config:
state = self._get_wizard_state(config)
for name in self._supported_modules:
try:
status = config.get_module_status(name)
status_time = config.get_module_status_time(name)
except NoSuchModule:
continue
module_status = {
"status": status,
"name": name,
"status_time": status_time,
}
if status in [ModuleStatus.FAILED, ModuleStatus.AUTO_SKIPPED]:
module_status["log_file"] = self._get_module_log_path(name)
modules.append(module_status)
if state == WizardStatus.CRASHED:
self._print_result_and_exit(
wizard_status=state, modules=modules, crash_log=CRASH_LOG_PATH
)
self._print_result_and_exit(wizard_status=state, modules=modules)
def _get_initial_status(self):
"""
Get initial modules status that is used
by lvemanager to display wizard pages
"""
error_message = get_package_db_errors()
if error_message:
# package manager DB corrupted
self._print_result_and_exit(result=error_message)
else:
self._print_result_and_exit(
modules={
module_name: cls().initial_status()
for module_name, cls in self._supported_modules.items()
},
unsuppored_by_cp=list(set(ALL_MODULES) - set(self._supported_modules)),
)
def _cancel_module_installation(self, module):
# type: (str) -> Optional[None]
"""Remove module from queue or print the error if it's not possible"""
self.log.info("Trying to cancel the installation of module '%s'", module)
with acquire_config_access() as config:
status = config.get_module_status(module)
if status in self.CANCELLABLE_MODULE_STATUSES:
config.set_module_status(
module_name=module, new_state=ModuleStatus.CANCELLED
)
self.log.info("Module '%s' installation successfully canceled", module)
else:
self.log.warning(
"Unable to cancel module '%s' installation, "
"because it is in status '%s'",
module,
status,
)
raise CancelModuleException(module, status)
def run_collecting_statistics(self):
"""
Collects user`s statistics
"""
cmd = ["/usr/sbin/cloudlinux-summary", "--send"]
if not os.environ.get("SYNCHRONOUS_SUMMARY"):
cmd.append("--async")
self.log.info("Collecting statistics...")
try:
out = run_command(cmd)
self.log.info("Statistics collection command output: '%s'", out)
except ExternalProgramFailed as err:
self.log.error("Error during statistics collection: '%s'", err)
def is_all_modules_installed(self):
# type: () -> bool
"""
Check that all modules were either:
-- installed
-- canceled
-- or auto-skipped
"""
with acquire_config_access() as config:
statuses = list(config.statuses.values())
return all(status in self.DONE_MODULES_STATUSES for status in statuses)
def run_cagefs_force_update(self):
"""
Runs cagefsctl --force-update in background
"""
cagefsctl_bin = "/usr/sbin/cagefsctl"
if not os.path.isfile(cagefsctl_bin):
return
cmd = [cagefsctl_bin, "--force-update", "--wait-lock"]
self.log.info("Starting cagefs force-update in the background: %s", cmd)
cagefsctl_proc = run_background(cmd)
# In Cloudlinux tests environment statistics wait for cagefsctl --force-update terminate
is_test_environment = bool(os.environ.get("CL_TEST_SYSTEM"))
if is_test_environment:
cagefsctl_proc.communicate()
def _get_wizard_state(self, config):
# type: (Config) -> str
# worker pid is None only in the case when wizard
# wasn't EVER called, this worker pid will stay
# in config forever, even after wizard is Done
if config.worker_pid is None:
return WizardStatus.IDLE
try:
psutil.Process(config.worker_pid)
except psutil.NoSuchProcess:
# Background process is no longer alive.
# 1. Wizard DONE: all modules are in state "installed", "cancelled" or "auto-skipped".
# 2. Wizard FAILED: one of the modules in state "failed" or "cancelled"
# and no modules are in status "installing"
# 3. Wizard CRASHED: none of the above.
statuses = list(config.statuses.values())
if all(status in self.DONE_MODULES_STATUSES for status in statuses):
return WizardStatus.DONE
# cancel module`s status is acceptable for general wizard status FAILED, DO NOT CHANGE IT PLS (LU-1295)
# An extra check for "installing" status is needed to exclude possible CRASHED wizard status
if any(
status in (ModuleStatus.FAILED, ModuleStatus.CANCELLED)
for status in statuses
) and not any(status in (ModuleStatus.INSTALLING,) for status in statuses):
return WizardStatus.FAILED
return WizardStatus.CRASHED
return WizardStatus.IN_PROGRESS
@staticmethod
def _print_result_and_exit(result="success", exit_code=0, **extra):
# type: (str, int, **Any) -> NoReturn
"""
Print data in default format for web and exit
:param dict extra: extra fields for the response,
usually we expect 'context' here
"""
message = {"result": result, "timestamp": time.time()}
message.update(extra)
print(json.dumps(message, indent=2, sort_keys=True))
sys.exit(exit_code)
Zerion Mini Shell 1.0