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component.py
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# Copyright 2020 Red Hat, Inc. # Author: Jake Hunsaker <jhunsake@redhat.com> # This file is part of the sos project: https://github.com/sosreport/sos # # This copyrighted material is made available to anyone wishing to use, # modify, copy, or redistribute it subject to the terms and conditions of # version 2 of the GNU General Public License. # # See the LICENSE file in the source distribution for further information. import json import logging import os import tempfile import sys import time from argparse import SUPPRESS from datetime import datetime from getpass import getpass from shutil import rmtree from pathlib import Path from sos import __version__ from sos.archive import TarFileArchive from sos.options import SoSOptions from sos.utilities import TempFileUtil, shell_out class SoSComponent(): """Any sub-command that sos supports needs to subclass SoSComponent in order to be properly supported by the sos binary. This class contains the standardized entrypoint for subcommands, as well as building out supported options from both globally shared option lists, and options supported by that specific subcommand. When sos initializes, it will load an unintialized instance of each class found within one recursion of the module root directory that subclasses SoSComponent. If sos is able to match the user-specified subcommand to one that exists locally, then that SoSComponent is initialized, logging is setup, and a policy is loaded. From there, the component's execute() method takes over. Added in 4.0 """ desc = 'unset' arg_defaults = {} configure_logging = True load_policy = True load_probe = True root_required = False _arg_defaults = { "batch": False, "compression_type": 'auto', "config_file": '/etc/sos/sos.conf', "debug": False, "encrypt": False, "encrypt_key": None, "encrypt_pass": None, "quiet": False, "threads": 4, "tmp_dir": '', "sysroot": None, "verbosity": 0 } def __init__(self, parser, parsed_args, cmdline_args): self.parser = parser self.args = parsed_args self.cmdline = cmdline_args self.exit_process = False self.archive = None self.tmpdir = None self.tempfile_util = None self.manifest = None try: import signal signal.signal(signal.SIGTERM, self.get_exit_handler()) except Exception: pass # update args from component's arg_defaults definition self._arg_defaults.update(self.arg_defaults) self.opts = self.load_options() # lgtm [py/init-calls-subclass] if self.configure_logging: tmpdir = self.get_tmpdir_default() # only setup metadata if we are logging self.manifest = SoSMetadata() if not os.path.isdir(tmpdir) \ or not os.access(tmpdir, os.W_OK): msg = "temporary directory %s " % tmpdir msg += "does not exist or is not writable\n" # write directly to stderr as logging is not initialised yet sys.stderr.write(msg) self._exit(1) self.sys_tmp = tmpdir self.tmpdir = tempfile.mkdtemp(prefix="sos.", dir=self.sys_tmp) self.tempfile_util = TempFileUtil(self.tmpdir) self._setup_logging() if self.load_policy: self.load_local_policy() if self.manifest is not None: self.manifest.add_field('version', __version__) self.manifest.add_field('cmdline', ' '.join(self.cmdline)) self.manifest.add_field('start_time', datetime.now()) # these three will be set later, add here for organization self.manifest.add_field('end_time', '') self.manifest.add_field('run_time', '') self.manifest.add_field('compression', '') self.manifest.add_field('tmpdir', self.tmpdir) self.manifest.add_field('tmpdir_fs_type', self.tmpfstype) self.manifest.add_field('policy', self.policy.distro) self.manifest.add_section('components') def load_local_policy(self): try: import sos.policies self.policy = sos.policies.load(sysroot=self.opts.sysroot, probe_runtime=self.load_probe) self.sysroot = self.policy.sysroot except KeyboardInterrupt: self._exit(0) self._is_root = self.policy.is_root() def execute(self): raise NotImplementedError def get_exit_handler(self): def exit_handler(signum, frame): self.exit_process = True self._exit() return exit_handler def _exit(self, error=0, msg=None): if msg: self.ui_log.error("") self.ui_log.error(msg) raise SystemExit(error) def get_tmpdir_default(self): """If --tmp-dir is not specified, provide a default location. Normally this is /var/tmp, but if we detect we are in a container, then use a standardized env var to redirect to the host's filesystem instead """ if self.opts.tmp_dir: tmpdir = os.path.abspath(self.opts.tmp_dir) else: tmpdir = os.getenv('TMPDIR', None) or '/var/tmp' if os.getenv('HOST', None) and os.getenv('container', None): tmpdir = os.path.join(os.getenv('HOST'), tmpdir.lstrip('/')) # no standard library method exists for this, so call out to stat to # avoid bringing in a dependency on psutil self.tmpfstype = shell_out( "stat --file-system --format=%s %s" % ("%T", tmpdir) ).strip() if self.tmpfstype == 'tmpfs': # can't log to the ui or sos.log yet since those require a defined # tmpdir to setup print("WARNING: tmp-dir is set to a tmpfs filesystem. This may " "increase memory pressure and cause instability on low " "memory systems, or when using --all-logs.") time.sleep(2) return tmpdir def check_listing_options(self): opts = [o for o in self.opts.dict().keys() if o.startswith('list')] if opts: return any([getattr(self.opts, opt) for opt in opts]) @classmethod def add_parser_options(cls, parser): """This should be overridden by each subcommand to add its own unique options to the parser """ pass def apply_options_from_cmdline(self, opts): """(Re-)apply options specified via the cmdline to an options instance There are several cases where we may need to re-apply the options from the cmdline over previously loaded options - for instance when an option is specified in both a config file and cmdline, or a preset and the cmdline, or all three. Use this to re-apply cmdline option overrides to anything that may change the default values of options Positional arguments: :param opts: SoSOptions object to update """ # override the values from config files with the values from the # cmdline iff that value was explicitly specified, and compare it to # the _current_ set of opts from the config files as a default cmdopts = SoSOptions().from_args( self.parser.parse_args(self.cmdline), arg_defaults=opts.dict(preset_filter=False) ) # we can't use merge() here, as argparse will pass default values for # unset options which would effectively negate config file settings and # set all values back to their normal default codict = cmdopts.dict(preset_filter=False) for opt, val in codict.items(): if opt not in cmdopts.arg_defaults.keys() or val in [None, [], '']: continue # A plugin that is [enabled|disabled|only] in cmdopts must # overwrite these three options of itself in opts - reset it first if opt in ["enable_plugins", "skip_plugins", "only_plugins"]: for oopt in ["enable_plugins", "skip_plugins", "only_plugins"]: common = set(val) & set(getattr(opts, oopt)) # common has all plugins that are in this combination of # "[-e|-o|-n] plug" of cmdopts & "[-e|-o|-n] plug" of opts # so remove those plugins from this [-e|-o|-n] opts if common: setattr(opts, oopt, [x for x in getattr(opts, oopt) if x not in common]) if val != opts.arg_defaults[opt]: setattr(opts, opt, val) return opts def load_options(self): """Compile arguments loaded from defaults, config files, and the command line into a usable set of options """ # load the defaults defined by the component and the shared options opts = SoSOptions(arg_defaults=self._arg_defaults) for option in self.parser._actions: if option.default != SUPPRESS: option.default = None opts.update_from_conf(self.args.config_file, self.args.component) # directly check the cmdline options here as they have yet to be loaded # as SoSOptions, and if we do this check after they are loaded we would # need to do a second update from cmdline options for overriding config # file values if '--clean' in self.cmdline or '--mask' in self.cmdline: opts.update_from_conf(self.args.config_file, 'clean') if os.getuid() != 0: userconf = os.path.join(Path.home(), '.config/sos/sos.conf') if os.path.exists(userconf): opts.update_from_conf(userconf, self.args.component) opts = self.apply_options_from_cmdline(opts) return opts def cleanup(self): # archive and tempfile cleanup may fail due to a fatal # OSError exception (ENOSPC, EROFS etc.). try: if self.archive: self.archive.cleanup() if self.tempfile_util: self.tempfile_util.clean() if self.tmpdir: rmtree(self.tmpdir) except Exception as err: print("Failed to finish cleanup: %s\nContents may remain in %s" % (err, self.tmpdir)) def _set_encrypt_from_env_vars(self): msg = ('No encryption environment variables set, archive will not be ' 'encrypted') if os.environ.get('SOSENCRYPTKEY'): self.opts.encrypt_key = os.environ.get('SOSENCRYPTKEY') msg = 'Encryption key set via environment variable' elif os.environ.get('SOSENCRYPTPASS'): self.opts.encrypt_pass = os.environ.get('SOSENCRYPTPASS') msg = 'Encryption passphrase set via environment variable' self.soslog.info(msg) self.ui_log.info(msg) def _get_encryption_method(self): if not self.opts.batch: _enc = None while _enc not in ('P', 'K', 'E', 'N'): _enc = input(( 'Specify encryption method [P]assphrase, [K]ey, [E]nv ' 'vars, [N]o encryption: ' )).upper() if _enc == 'P': self.opts.encrypt_pass = getpass('Specify encryption ' 'passphrase: ') elif _enc == 'K': self.opts.encrypt_key = input('Specify encryption key: ') elif _enc == 'E': self._set_encrypt_from_env_vars() else: self.opts.encrypt_key = None self.opts.encrypt_pass = None self.soslog.info("User specified --encrypt, but chose no " "encryption when prompted.") self.ui_log.warning("Archive will not be encrypted") else: self._set_encrypt_from_env_vars() def setup_archive(self, name=''): if self.opts.encrypt: self._get_encryption_method() enc_opts = { 'encrypt': True if (self.opts.encrypt_pass or self.opts.encrypt_key) else False, 'key': self.opts.encrypt_key, 'password': self.opts.encrypt_pass } if not name: name = self.policy.get_archive_name() archive_name = os.path.join(self.tmpdir, name) if self.opts.compression_type == 'auto': auto_archive = self.policy.get_preferred_archive() self.archive = auto_archive(archive_name, self.tmpdir, self.policy, self.opts.threads, enc_opts, self.sysroot, self.manifest) else: self.archive = TarFileArchive(archive_name, self.tmpdir, self.policy, self.opts.threads, enc_opts, self.sysroot, self.manifest) self.archive.set_debug(self.opts.verbosity > 2) def add_ui_log_to_stdout(self): ui_console = logging.StreamHandler(sys.stdout) ui_console.setFormatter(logging.Formatter('%(message)s')) ui_console.setLevel( logging.DEBUG if self.opts.verbosity > 1 else logging.INFO ) self.ui_log.addHandler(ui_console) def set_loggers_verbosity(self, verbosity): if verbosity: if self.flog: self.flog.setLevel(logging.DEBUG) if self.opts.verbosity > 1: self.console.setLevel(logging.DEBUG) else: self.console.setLevel(logging.WARNING) else: self.console.setLevel(logging.WARNING) def _setup_logging(self): """Creates the log handler that shall be used by all components and any and all related bits to those components that need to log either to the console or to the log file for that run of sos. """ # main soslog self.soslog = logging.getLogger('sos') self.soslog.setLevel(logging.DEBUG) self.flog = None if not self.check_listing_options(): self.sos_log_file = self.get_temp_file() self.flog = logging.StreamHandler(self.sos_log_file) self.flog.setFormatter(logging.Formatter( '%(asctime)s %(levelname)s: %(message)s')) self.flog.setLevel(logging.INFO) self.soslog.addHandler(self.flog) if not self.opts.quiet: self.console = logging.StreamHandler(sys.stdout) self.console.setFormatter(logging.Formatter('%(message)s')) self.set_loggers_verbosity(self.opts.verbosity) self.soslog.addHandler(self.console) # still log ERROR level message to console, but only setup this handler # when --quiet is used, as otherwise we'll double log else: console_err = logging.StreamHandler(sys.stderr) console_err.setFormatter(logging.Formatter('%(message)s')) console_err.setLevel(logging.ERROR) self.soslog.addHandler(console_err) # ui log self.ui_log = logging.getLogger('sos_ui') self.ui_log.setLevel( logging.DEBUG if self.opts.verbosity > 1 else logging.INFO ) if not self.check_listing_options(): self.sos_ui_log_file = self.get_temp_file() ui_fhandler = logging.StreamHandler(self.sos_ui_log_file) ui_fhandler.setFormatter(logging.Formatter( '%(asctime)s %(levelname)s: %(message)s')) self.ui_log.addHandler(ui_fhandler) if not self.opts.quiet: self.add_ui_log_to_stdout() def get_temp_file(self): return self.tempfile_util.new() class SoSMetadata(): """This class is used to record metadata from a sos execution that will then be stored as a JSON-formatted manifest within the final tarball. It can be extended by adding further instances of SoSMetadata to represent dict-like structures throughout the various sos bits that record to metadata """ def __init__(self): self._values = {} def __iter__(self): for item in self._values.items(): yield item[1] def __getitem__(self, item): return self._values[item] def __getattr__(self, attr): try: return self._values[attr] except Exception: raise AttributeError(attr) def add_field(self, field_name, content): """Add a key, value entry to the current metadata instance """ self._values[field_name] = content def add_section(self, section_name): """Adds a new instance of SoSMetadata to the current instance """ self._values[section_name] = SoSMetadata() return self._values[section_name] def add_list(self, list_name, content=[]): """Add a named list element to the current instance. If content is not supplied, then add an empty list that can alter be appended to """ if not isinstance(content, list): raise TypeError('content added must be list') self._values[list_name] = content def get_json(self, indent=None): """Convert contents of this SoSMetdata instance, and all other nested instances (sections), into a json-formatted output. Used to write manifest.json to the final archives. """ return json.dumps(self, default=lambda o: getattr(o, '_values', str(o)), indent=indent) # vim: set et ts=4 sw=4 :