# # The Qubes OS Project, https://www.qubes-os.org/ # # Copyright (C) 2019 WillyPillow # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public License along # with this program; if not, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. '''Tool for managing VM templates.''' import argparse import collections import datetime import enum import fcntl import fnmatch import functools import itertools import json import operator import os import re import shutil import subprocess import sys import tempfile import time import typing import tqdm import xdg.BaseDirectory import rpm import qubesadmin import qubesadmin.tools import qubesadmin.tools.qvm_kill import qubesadmin.tools.qvm_remove PATH_PREFIX = '/var/lib/qubes/vm-templates' TEMP_DIR = '/var/tmp' PACKAGE_NAME_PREFIX = 'qubes-template-' CACHE_DIR = os.path.join(xdg.BaseDirectory.xdg_cache_home, 'qvm-template') UNVERIFIED_SUFFIX = '.unverified' LOCK_FILE = '/var/tmp/qvm-template.lck' DATE_FMT = '%Y-%m-%d %H:%M:%S' UPDATEVM = str('global UpdateVM') class AlreadyRunning(Exception): """Another qvm-template is already running""" class SignatureVerificationError(Exception): """Package signature is invalid or missing""" def qubes_release() -> str: """Return the Qubes release.""" if os.path.exists('/usr/share/qubes/marker-vm'): with open('/usr/share/qubes/marker-vm', 'r') as fd: # Get last line (in the format `x.x`) return fd.readlines()[-1].strip() with open('/etc/os-release', 'r') as fd: for line in fd: line = line.strip() if not line or line[0] == '#': continue key, val = line.split('=', 1) if key != 'VERSION_ID': continue val = val.strip('\'"') # strip possible quotes return val # Return default value instead of throwing so that it works on CI return '4.1' def get_parser() -> argparse.ArgumentParser: """Generate argument parser for the application.""" formatter = argparse.ArgumentDefaultsHelpFormatter parser_main = qubesadmin.tools.QubesArgumentParser(description=__doc__, formatter_class=formatter) parser_main.register('action', 'parsers', qubesadmin.tools.AliasedSubParsersAction) subparsers = parser_main.add_subparsers(dest='command', description='Command to run.') def parser_add_command(cmd, help_str): return subparsers.add_parser( cmd, formatter_class=formatter, help=help_str, description=help_str) parser_main.add_argument('--repo-files', action='append', default=['/etc/qubes/repo-templates/qubes-templates.repo'], help=('Specify files containing DNF repository configuration.' ' Can be used more than once.')) parser_main.add_argument('--keyring', default='/etc/qubes/repo-templates/keys', help='Specify directory containing RPM public keys.') parser_main.add_argument('--updatevm', default=UPDATEVM, help=('Specify VM to download updates from.' ' (Set to empty string to specify the current VM.)')) parser_main.add_argument('--enablerepo', action='append', default=[], metavar='REPOID', help=('Enable additional repositories by an id or a glob.' ' Can be used more than once.')) parser_main.add_argument('--disablerepo', action='append', default=[], metavar='REPOID', help=('Disable certain repositories by an id or a glob.' ' Can be used more than once.')) parser_main.add_argument('--repoid', action='append', default=[], help=('Enable just specific repositories by an id or a glob.' ' Can be used more than once.')) parser_main.add_argument('--releasever', default=qubes_release(), help='Override Qubes release version.') parser_main.add_argument('--refresh', action='store_true', help='Set repository metadata as expired before running the command.') parser_main.add_argument('--cachedir', default=CACHE_DIR, help='Specify cache directory.') parser_main.add_argument('--keep-cache', action='store_true', default=False, help='Keep downloaded packages in cache dir') parser_main.add_argument('--yes', action='store_true', help='Assume "yes" to questions.') # qvm-template {install,reinstall,downgrade,upgrade} parser_install = parser_add_command('install', help_str='Install template packages.') parser_install.add_argument('--pool', help='Specify storage pool to store created templates in.') parser_reinstall = parser_add_command('reinstall', help_str='Reinstall template packages.') parser_downgrade = parser_add_command('downgrade', help_str='Downgrade template packages.') parser_upgrade = parser_add_command('upgrade', help_str='Upgrade template packages.') for parser_x in [parser_install, parser_reinstall, parser_downgrade, parser_upgrade]: parser_x.add_argument('--nogpgcheck', action='store_true', help='Disable signature checks.') parser_x.add_argument('--allow-pv', action='store_true', help='Allow templates that set virt_mode to pv.') parser_x.add_argument('templates', nargs='*', metavar='TEMPLATESPEC') # qvm-template download parser_download = parser_add_command('download', help_str='Download template packages.') for parser_x in [parser_install, parser_reinstall, parser_downgrade, parser_upgrade, parser_download]: parser_x.add_argument('--downloaddir', default='.', help='Specify download directory.') parser_x.add_argument('--retries', default=5, type=int, help='Specify maximum number of retries for downloads.') parser_download.add_argument('templates', nargs='*', metavar='TEMPLATESPEC') # qvm-template {list,info} parser_list = parser_add_command('list', help_str='List templates.') parser_info = parser_add_command('info', help_str='Display details about templates.') for parser_x in [parser_list, parser_info]: parser_x.add_argument('--all', action='store_true', help='Show all templates (default).') parser_x.add_argument('--installed', action='store_true', help='Show installed templates.') parser_x.add_argument('--available', action='store_true', help='Show available templates.') parser_x.add_argument('--extras', action='store_true', help=('Show extras (e.g., ones that exist' ' locally but not in repos) templates.')) parser_x.add_argument('--upgrades', action='store_true', help='Show available upgrades.') readable = parser_x.add_mutually_exclusive_group() readable.add_argument('--machine-readable', action='store_true', help='Enable machine-readable output.') readable.add_argument('--machine-readable-json', action='store_true', help='Enable machine-readable output (JSON).') parser_x.add_argument('templates', nargs='*', metavar='TEMPLATESPEC') # qvm-template search parser_search = parser_add_command('search', help_str='Search template details for the given string.') parser_search.add_argument('--all', action='store_true', help=('Search also in the template description and URL. In addition,' ' the criterion are evaluated with OR instead of AND.')) parser_search.add_argument('templates', nargs='*', metavar='PATTERN') # qvm-template remove parser_remove = parser_add_command('remove', help_str='Remove installed templates.') parser_remove.add_argument('--disassoc', action='store_true', help=('Also disassociate VMs from the templates to be removed.' ' This creates a dummy template for the VMs to link with.')) parser_remove.add_argument('templates', nargs='*', metavar='TEMPLATE') # qvm-template purge parser_purge = parser_add_command('purge', help_str='Remove installed templates and associated VMs.') parser_purge.add_argument('templates', nargs='*', metavar='TEMPLATE') # qvm-template clean parser_clean = parser_add_command('clean', help_str='Remove locally cached packages.') _ = parser_clean # unused # qvm-template repolist parser_repolist = parser_add_command('repolist', help_str='Show configured repositories.') repolim = parser_repolist.add_mutually_exclusive_group() repolim.add_argument('--all', action='store_true', help='Show all repos.') repolim.add_argument('--enabled', action='store_true', help='Show only enabled repos (default).') repolim.add_argument('--disabled', action='store_true', help='Show only disabled repos.') parser_repolist.add_argument('repos', nargs='*', metavar='REPOS') return parser_main parser = get_parser() class TemplateState(enum.Enum): """Enum representing the state of a template.""" INSTALLED = 'installed' AVAILABLE = 'available' EXTRA = 'extra' UPGRADABLE = 'upgradable' def title(self) -> str: """Return a long description of the state. Can be used as headings.""" #pylint: disable=invalid-name TEMPLATE_TITLES = { TemplateState.INSTALLED: 'Installed Templates', TemplateState.AVAILABLE: 'Available Templates', TemplateState.EXTRA: 'Extra Templates', TemplateState.UPGRADABLE: 'Available Upgrades' } return TEMPLATE_TITLES[self] class VersionSelector(enum.Enum): """Enum representing how the candidate template version is chosen.""" LATEST = enum.auto() """Install latest version.""" REINSTALL = enum.auto() """Reinstall current version.""" LATEST_LOWER = enum.auto() """Downgrade to the highest version that is lower than the current one.""" LATEST_HIGHER = enum.auto() """Upgrade to the highest version that is higher than the current one.""" class Template(typing.NamedTuple): """Details of a template.""" name: str epoch: str version: str release: str reponame: str dlsize: int buildtime: datetime.datetime licence: str url: str summary: str description: str class DlEntry(typing.NamedTuple): """Information about a template to be downloaded.""" evr: typing.Tuple[str, str, str] reponame: str dlsize: int def build_version_str(evr: typing.Tuple[str, str, str]) -> str: """Return version string described by ``evr``, which is in (epoch, version, release) format.""" return '%s:%s-%s' % evr def is_match_spec(name: str, epoch: str, version: str, release: str, spec: str ) -> typing.Tuple[bool, float]: """Check whether (name, epoch, version, release) matches the spec string. For the algorithm, refer to section "NEVRA Matching" in the DNF documentation. Note that currently ``arch`` is ignored as the templates should be of ``noarch``. :return: A tuple. The first element indicates whether there is a match; the second element represents the priority of the match (lower is better) """ if epoch != '0': targets = [ f'{name}-{epoch}:{version}-{release}', f'{name}', f'{name}-{epoch}:{version}' ] else: targets = [ f'{name}-{epoch}:{version}-{release}', f'{name}-{version}-{release}', f'{name}', f'{name}-{epoch}:{version}', f'{name}-{version}' ] for prio, target in enumerate(targets): if fnmatch.fnmatch(target, spec): return True, prio return False, float('inf') def query_local(vm: qubesadmin.vm.QubesVM) -> Template: """Return Template object associated with ``vm``. Requires the VM to be managed by qvm-template. """ return Template( vm.features['template-name'], vm.features['template-epoch'], vm.features['template-version'], vm.features['template-release'], vm.features['template-reponame'], vm.get_disk_utilization(), datetime.datetime.strptime(vm.features['template-buildtime'], DATE_FMT), vm.features['template-license'], vm.features['template-url'], vm.features['template-summary'], vm.features['template-description'].replace('|', '\n')) def query_local_evr(vm: qubesadmin.vm.QubesVM) -> typing.Tuple[str, str, str]: """Return the (epoch, version, release) of ``vm``. Requires the VM to be managed by qvm-template. """ return ( vm.features['template-epoch'], vm.features['template-version'], vm.features['template-release']) def is_managed_template(vm: qubesadmin.vm.QubesVM) -> bool: """Return whether the VM is managed by qvm-template.""" return vm.features.get('template-name', None) == vm.name def get_managed_template_vm(app: qubesadmin.app.QubesBase, name: str ) -> qubesadmin.vm.QubesVM: """Return the QubesVM object associated with the given name if it exists and is managed by qvm-template, otherwise raise a parser error.""" if name not in app.domains: parser.error("Template '%s' not already installed." % name) vm = app.domains[name] if not is_managed_template(vm): parser.error("Template '%s' is not managed by qvm-template." % name) return vm def confirm_action(msg: str, affected: typing.List[str]) -> None: """Confirm user action.""" print(msg) for name in affected: print(' ' + name) confirm = '' while confirm != 'y': confirm = input('Are you sure? [y/N] ').lower() if confirm == 'n': print('command cancelled.') sys.exit(1) def qrexec_popen( args: argparse.Namespace, app: qubesadmin.app.QubesBase, service: str, stdout: typing.Union[int, typing.IO] = subprocess.PIPE, filter_esc: bool = True) -> subprocess.Popen: """Return ``Popen`` object that communicates with the given qrexec call in ``args.updatevm``. Note that this falls back to invoking ``/etc/qubes-rpc/*`` directly if ``args.updatevm`` is empty string. :param args: Arguments received by the application. ``args.updatevm`` is used :param app: Qubes application object :param service: The qrexec call to invoke :param stdout: Where the process stdout points to. This is passed directly to ``subprocess.Popen``. Defaults to ``subprocess.PIPE`` Note that stderr is always set to ``subprocess.PIPE`` :param filter_esc: Whether to filter out escape sequences from stdout/stderr. Defaults to True :returns: ``Popen`` object that communicates with the given qrexec call """ if args.updatevm: return app.domains[args.updatevm].run_service( service, filter_esc=filter_esc, stdout=stdout) return subprocess.Popen([ '/etc/qubes-rpc/%s' % service, ], stdin=subprocess.PIPE, stdout=stdout, stderr=subprocess.PIPE) def qrexec_payload(args: argparse.Namespace, app: qubesadmin.app.QubesBase, spec: str, refresh: bool) -> str: """Return payload string for the ``qubes.Template*`` qrexec calls. :param args: Arguments received by the application. Specifically, ``args.{enablerepo,disablerepo,repoid,releasever,repo_files}`` are used :param app: Qubes application object :param spec: Package spec to query (refer to ```` in the DNF documentation) :param refresh: Whether to force refresh repo metadata :return: Payload string :raises: Parser error if spec equals ``---`` or input contains ``\\n`` """ _ = app # unused if spec == '---': parser.error("Malformed template name: argument should not be '---'.") def check_newline(string, name): if '\n' in string: parser.error(f"Malformed {name}:" + " argument should not contain '\\n'.") payload = '' for repo in args.enablerepo: check_newline(repo, '--enablerepo') payload += '--enablerepo=%s\n' % repo for repo in args.disablerepo: check_newline(repo, '--disablerepo') payload += '--disablerepo=%s\n' % repo for repo in args.repoid: check_newline(repo, '--repoid') payload += '--repoid=%s\n' % repo if refresh: payload += '--refresh\n' check_newline(args.releasever, '--releasever') payload += '--releasever=%s\n' % args.releasever check_newline(spec, 'template name') payload += spec + '\n' payload += '---\n' for path in args.repo_files: with open(path, 'r') as fd: payload += fd.read() + '\n' return payload def qrexec_repoquery( args: argparse.Namespace, app: qubesadmin.app.QubesBase, spec: str = '*', refresh: bool = False) -> typing.List[Template]: """Query template information from repositories. :param args: Arguments received by the application. Specifically, ``args.{enablerepo,disablerepo,repoid,releasever,repo_files,updatevm}`` are used :param app: Qubes application object :param spec: Package spec to query (refer to ```` in the DNF documentation). Defaults to ``*`` :param refresh: Whether to force refresh repo metadata. Defaults to False :raises ConnectionError: if the qrexec call fails :return: List of ``Template`` objects representing the result of the query """ payload = qrexec_payload(args, app, spec, refresh) proc = qrexec_popen(args, app, 'qubes.TemplateSearch') stdout, stderr = proc.communicate(payload.encode('UTF-8')) stdout = stdout.decode('ASCII') if proc.wait() != 0: for line in stderr.decode('ASCII').rstrip().split('\n'): print('[Qrexec] %s' % line, file=sys.stderr) raise ConnectionError("qrexec call 'qubes.TemplateSearch' failed.") name_re = re.compile(r'^[A-Za-z0-9._+-]*$') evr_re = re.compile(r'^[A-Za-z0-9._+~]*$') date_re = re.compile(r'^\d+-\d+-\d+ \d+:\d+$') licence_re = re.compile(r'^[A-Za-z0-9._+()-]*$') result = [] # FIXME: This breaks when \n is the first character of the description for line in stdout.split('|\n'): # Note that there's an empty entry at the end as .strip() is not used. # This is because if .strip() is used, the .split() will not work. if line == '': continue entry = line.split('|') try: # If there is an incorrect number of entries, raise an error # Unpack manually instead of stuffing into `Template` right away # so that it's easier to mutate stuff. name, epoch, version, release, reponame, dlsize, \ buildtime, licence, url, summary, description = entry # Ignore packages that are not templates if not name.startswith(PACKAGE_NAME_PREFIX): continue name = name[len(PACKAGE_NAME_PREFIX):] # Check that the values make sense if not re.fullmatch(name_re, name): raise ValueError for val in [epoch, version, release]: if not re.fullmatch(evr_re, val): raise ValueError if not re.fullmatch(name_re, reponame): raise ValueError dlsize = int(dlsize) # First verify that the date does not look weird, then parse it if not re.fullmatch(date_re, buildtime): raise ValueError buildtime = datetime.datetime.strptime(buildtime, '%Y-%m-%d %H:%M') # XXX: Perhaps whitelist licenses directly? if not re.fullmatch(licence_re, licence): raise ValueError # Check name actually matches spec if not is_match_spec(PACKAGE_NAME_PREFIX + name, epoch, version, release, spec)[0]: continue result.append(Template(name, epoch, version, release, reponame, dlsize, buildtime, licence, url, summary, description)) except (TypeError, ValueError): raise ConnectionError(("qrexec call 'qubes.TemplateSearch' failed:" " unexpected data format.")) return result def qrexec_download( args: argparse.Namespace, app: qubesadmin.app.QubesBase, spec: str, path: str, dlsize: typing.Optional[int] = None, refresh: bool = False) -> None: """Download a template from repositories. :param args: Arguments received by the application. Specifically, ``args.{enablerepo,disablerepo,repoid,releasever,repo_files,updatevm, quiet}`` are used :param app: Qubes application object :param spec: Package spec to query (refer to ```` in the DNF documentation) :param path: Path to place the downloaded template :param dlsize: Size of template to be downloaded. Used for the progress bar. Optional :param refresh: Whether to force refresh repo metadata. Defaults to False :raises ConnectionError: if the qrexec call fails """ with open(path, 'wb') as fd: payload = qrexec_payload(args, app, spec, refresh) # Don't filter ESCs for binary files proc = qrexec_popen(args, app, 'qubes.TemplateDownload', stdout=fd, filter_esc=False) proc.stdin.write(payload.encode('UTF-8')) proc.stdin.close() with tqdm.tqdm(desc=spec, total=dlsize, unit_scale=True, unit_divisor=1000, unit='B', disable=args.quiet) as pbar: last = 0 while proc.poll() is None: cur = fd.tell() pbar.update(cur - last) last = cur time.sleep(0.1) if proc.wait() != 0: raise ConnectionError( "qrexec call 'qubes.TemplateDownload' failed.") def get_keys(key_dir: str) -> typing.List[str]: """List gpg keys""" keys = [] for name in os.listdir(key_dir): path = os.path.join(key_dir, name) if os.path.isfile(path): keys.append(path) return keys def verify_rpm( path: str, keys: typing.List[str], nogpgcheck: bool = False ) -> rpm.hdr: """Verify the digest and signature of a RPM package and return the package header. Note that verifying RPMs this way is prone to TOCTOU. This is okay for local files, but may create problems if multiple instances of **qvm-template** are downloading the same file, so a lock is needed in that case. :param path: Location of the RPM package :param nogpgcheck: Whether to allow invalid GPG signatures :return: RPM package header. If verification fails, raises an exception. """ if not nogpgcheck: with tempfile.TemporaryDirectory() as rpmdb_dir: for key in keys: subprocess.check_call( ['rpmkeys', '--dbpath=' + rpmdb_dir, '--import', key]) try: output = subprocess.check_output( ['rpmkeys', '--dbpath=' + rpmdb_dir, '--checksig', path]) except subprocess.CalledProcessError as e: raise SignatureVerificationError( 'Signature verification failed: {}'.format( e.output.decode())) if not output.endswith(b': digests signatures OK\n'): raise SignatureVerificationError( 'Signature verification failed: {}'.format(output.decode())) with open(path, 'rb') as fd: tset = rpm.TransactionSet() tset.setVSFlags(rpm.RPMVSF_MASK_NOSIGNATURES) hdr = tset.hdrFromFdno(fd) return hdr def extract_rpm(name: str, path: str, target: str) -> bool: """Extract a template RPM package. :param name: Name of the template :param path: Location of the RPM package :param target: Target path to extract to :return: Whether the extraction succeeded """ rpm2cpio = subprocess.Popen(['rpm2cpio', path], stdout=subprocess.PIPE) # `-D` is GNUism cpio = subprocess.Popen([ 'cpio', '-idm', '-D', target, '.%s/%s/*' % (PATH_PREFIX, name) ], stdin=rpm2cpio.stdout, stdout=subprocess.DEVNULL) return rpm2cpio.wait() == 0 and cpio.wait() == 0 def get_dl_list( args: argparse.Namespace, app: qubesadmin.app.QubesBase, version_selector: VersionSelector = VersionSelector.LATEST ) -> typing.Dict[str, DlEntry]: """Return list of templates that needs to be downloaded. :param args: Arguments received by the application. :param app: Qubes application object :param version_selector: Specify algorithm to select the candidate version of a package. Defaults to ``VersionSelector.LATEST`` :return: Dictionary that maps to ``DlEntry`` the names of templates that needs to be downloaded """ full_candid: typing.Dict[str, DlEntry] = {} for template in args.templates: # This will be merged into `full_candid` later. # It is separated so that we can check whether it is empty. candid: typing.Dict[str, DlEntry] = {} # Skip local RPMs if template.endswith('.rpm'): continue query_res = qrexec_repoquery(args, app, PACKAGE_NAME_PREFIX + template) # We only select one package for each distinct package name for entry in query_res: ver = (entry.epoch, entry.version, entry.release) insert = False if version_selector == VersionSelector.LATEST: if entry.name not in candid \ or rpm.labelCompare(candid[entry.name][0], ver) < 0: insert = True elif version_selector == VersionSelector.REINSTALL: vm = get_managed_template_vm(app, entry.name) cur_ver = query_local_evr(vm) if rpm.labelCompare(ver, cur_ver) == 0: insert = True elif version_selector in [VersionSelector.LATEST_LOWER, VersionSelector.LATEST_HIGHER]: vm = get_managed_template_vm(app, entry.name) cur_ver = query_local_evr(vm) cmp_res = -1 \ if version_selector == VersionSelector.LATEST_LOWER \ else 1 if rpm.labelCompare(ver, cur_ver) == cmp_res: if entry.name not in candid \ or rpm.labelCompare(candid[entry.name][0], ver) < 0: insert = True if insert: candid[entry.name] = DlEntry(ver, entry.reponame, entry.dlsize) # XXX: As it's possible to include version information in `template`, # perhaps the messages can be improved if len(candid) == 0: if version_selector == VersionSelector.LATEST: parser.error('Template \'%s\' not found.' % template) elif version_selector == VersionSelector.REINSTALL: parser.error('Same version of template \'%s\' not found.' \ % template) # Copy behavior of DNF and do nothing if version not found elif version_selector == VersionSelector.LATEST_LOWER: print(("Template '%s' of lowest version" " already installed, skipping..." % template), file=sys.stderr) elif version_selector == VersionSelector.LATEST_HIGHER: print(("Template '%s' of highest version" " already installed, skipping..." % template), file=sys.stderr) # Merge & choose the template with the highest version for name, dlentry in candid.items(): if name not in full_candid \ or rpm.labelCompare(full_candid[name].evr, dlentry.evr) < 0: full_candid[name] = dlentry return full_candid def download( args: argparse.Namespace, app: qubesadmin.app.QubesBase, path_override: typing.Optional[str] = None, dl_list: typing.Optional[typing.Dict[str, DlEntry]] = None, suffix: str = '', version_selector: VersionSelector = VersionSelector.LATEST) -> None: """Command that downloads template packages. :param args: Arguments received by the application. :param app: Qubes application object :param path_override: Override path to store downloads. If not set or set to None, ``args.downloaddir`` is used. Optional :param dl_list: Override list of templates to download. If not set or set to None, ``get_dl_list`` is called, which generates the list from ``args``. Optional :param suffix: Suffix to add to the file name of downloaded packages. This is useful if you want to distinguish between verified and unverified packages. Defaults to an empty string :param version_selector: Specify algorithm to select the candidate version of a package. Defaults to ``VersionSelector.LATEST`` """ if dl_list is None: dl_list = get_dl_list(args, app, version_selector=version_selector) path = path_override if path_override is not None else args.downloaddir for name, entry in dl_list.items(): version_str = build_version_str(entry.evr) spec = PACKAGE_NAME_PREFIX + name + '-' + version_str target = os.path.join(path, '%s.rpm' % spec) target_suffix = target + suffix if os.path.exists(target_suffix): print('\'%s\' already exists, skipping...' % target, file=sys.stderr) elif os.path.exists(target): print('\'%s\' already exists, skipping...' % target, file=sys.stderr) os.rename(target, target_suffix) else: print('Downloading \'%s\'...' % spec, file=sys.stderr) done = False for attempt in range(args.retries): try: qrexec_download(args, app, spec, target_suffix, entry.dlsize) done = True break except ConnectionError: os.remove(target_suffix) if attempt + 1 < args.retries: print('\'%s\' download failed, retrying...' % spec, file=sys.stderr) except: # Also remove file if interrupted by other means os.remove(target_suffix) raise if not done: print('Error: \'%s\' download failed.' % spec, file=sys.stderr) sys.exit(1) def locked(func): """Execute given function under a lock in *LOCK_FILE*""" @functools.wraps(func) def wrapper(*args, **kwargs): with open(LOCK_FILE, 'w') as lock: try: fcntl.flock(lock.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB) except OSError: raise AlreadyRunning( ('cannot get lock on %s. ' 'Perhaps another instance of qvm-template is running?') % LOCK_FILE) try: return func(*args, **kwargs) finally: os.remove(LOCK_FILE) return wrapper @locked def install( args: argparse.Namespace, app: qubesadmin.app.QubesBase, version_selector: VersionSelector = VersionSelector.LATEST, override_existing: bool = False) -> None: """Command that installs template packages. This command creates a lock file to ensure that two instances are not running at the same time. :param args: Arguments received by the application. :param app: Qubes application object :param version_selector: Specify algorithm to select the candidate version of a package. Defaults to ``VersionSelector.LATEST`` :param override_existing: Whether to override existing packages. Used for reinstall, upgrade, and downgrade operations """ keys = get_keys(args.keyring) unverified_rpm_list = [] # rpmfile, reponame verified_rpm_list = [] def verify(rpmfile, reponame, dl_dir=None): """Verify package signature and version, remove "unverified" suffix, and parse package header.""" if dl_dir: path = os.path.join( dl_dir, os.path.basename(rpmfile) + UNVERIFIED_SUFFIX) else: path = rpmfile package_hdr = verify_rpm(path, keys, args.nogpgcheck) if not package_hdr: parser.error('Package \'%s\' verification failed.' % rpmfile) package_name = package_hdr[rpm.RPMTAG_NAME] if not package_name.startswith(PACKAGE_NAME_PREFIX): parser.error( 'Illegal package name for package \'%s\'.' % rpmfile) # Remove prefix to get the real template name name = package_name[len(PACKAGE_NAME_PREFIX):] if path != rpmfile: os.rename(path, rpmfile) # Check if already installed if not override_existing and name in app.domains: print(('Template \'%s\' already installed, skipping...' ' (You may want to use the' ' {reinstall,upgrade,downgrade}' ' operations.)') % name, file=sys.stderr) return # Check if version is really what we want if override_existing: vm = get_managed_template_vm(app, name) pkg_evr = ( str(package_hdr[rpm.RPMTAG_EPOCHNUM]), package_hdr[rpm.RPMTAG_VERSION], package_hdr[rpm.RPMTAG_RELEASE]) vm_evr = query_local_evr(vm) cmp_res = rpm.labelCompare(pkg_evr, vm_evr) if version_selector == VersionSelector.REINSTALL \ and cmp_res != 0: parser.error( 'Same version of template \'%s\' not found.' \ % name) elif version_selector == VersionSelector.LATEST_LOWER \ and cmp_res != -1: print(("Template '%s' of lower version" " already installed, skipping..." % name), file=sys.stderr) return elif version_selector == VersionSelector.LATEST_HIGHER \ and cmp_res != 1: print(("Template '%s' of higher version" " already installed, skipping..." % name), file=sys.stderr) return verified_rpm_list.append((rpmfile, reponame, name, package_hdr)) # Process local templates for template in args.templates: if template.endswith('.rpm'): if not os.path.exists(template): parser.error('RPM file \'%s\' not found.' % template) unverified_rpm_list.append((template, '@commandline')) # First verify local RPMs and extract header for rpmfile, reponame in unverified_rpm_list: verify(rpmfile, reponame) unverified_rpm_list = [] os.makedirs(args.cachedir, exist_ok=True) # Get list of templates to download dl_list = get_dl_list(args, app, version_selector=version_selector) dl_list_copy = dl_list.copy() for name, entry in dl_list.items(): # Should be ensured by checks in repoquery assert entry.reponame != '@commandline' # Verify that the templates to be downloaded are not yet installed # Note that we *still* have to do this again in verify() for # already-downloaded templates if not override_existing and name in app.domains: print(('Template \'%s\' already installed, skipping...' ' (You may want to use the' ' {reinstall,upgrade,downgrade}' ' operations.)') % name, file=sys.stderr) del dl_list_copy[name] else: # XXX: Perhaps this is better returned by download() version_str = build_version_str(entry.evr) target_file = \ '%s%s-%s.rpm' % (PACKAGE_NAME_PREFIX, name, version_str) unverified_rpm_list.append( (os.path.join(args.cachedir, target_file), entry.reponame)) dl_list = dl_list_copy # Ask the user for confirmation before we actually download stuff if override_existing and not args.yes: override_tpls = [] # Local templates, already verified for _, _, name, _ in verified_rpm_list: override_tpls.append(name) # Templates not yet downloaded for name in dl_list: override_tpls.append(name) confirm_action( 'This will override changes made in the following VMs:', override_tpls) with tempfile.TemporaryDirectory(dir=args.cachedir) as dl_dir: download(args, app, path_override=dl_dir, dl_list=dl_list, suffix=UNVERIFIED_SUFFIX, version_selector=version_selector) # Verify downloaded templates for rpmfile, reponame in unverified_rpm_list: verify(rpmfile, reponame, dl_dir=dl_dir) unverified_rpm_list = [] # Unpack and install for rpmfile, reponame, name, package_hdr in verified_rpm_list: with tempfile.TemporaryDirectory(dir=TEMP_DIR) as target: print('Installing template \'%s\'...' % name, file=sys.stderr) if not extract_rpm(name, rpmfile, target): raise Exception( 'Failed to extract {} template'.format(name)) cmdline = [ 'qvm-template-postprocess', '--really', '--no-installed-by-rpm', ] if args.allow_pv: cmdline.append('--allow-pv') if not override_existing and args.pool: cmdline += ['--pool', args.pool] subprocess.check_call(cmdline + [ 'post-install', name, target + PATH_PREFIX + '/' + name]) app.domains.refresh_cache(force=True) tpl = app.domains[name] tpl.features['template-name'] = name tpl.features['template-epoch'] = \ package_hdr[rpm.RPMTAG_EPOCHNUM] tpl.features['template-version'] = \ package_hdr[rpm.RPMTAG_VERSION] tpl.features['template-release'] = \ package_hdr[rpm.RPMTAG_RELEASE] tpl.features['template-reponame'] = reponame tpl.features['template-buildtime'] = \ datetime.datetime.fromtimestamp( int(package_hdr[rpm.RPMTAG_BUILDTIME]), tz=datetime.timezone.utc) \ .strftime(DATE_FMT) tpl.features['template-installtime'] = \ datetime.datetime.now( tz=datetime.timezone.utc).strftime(DATE_FMT) tpl.features['template-license'] = \ package_hdr[rpm.RPMTAG_LICENSE] tpl.features['template-url'] = \ package_hdr[rpm.RPMTAG_URL] tpl.features['template-summary'] = \ package_hdr[rpm.RPMTAG_SUMMARY] tpl.features['template-description'] = \ package_hdr[rpm.RPMTAG_DESCRIPTION].replace('\n', '|') if rpmfile.startswith(args.cachedir) and not args.keep_cache: os.remove(rpmfile) def list_templates(args: argparse.Namespace, app: qubesadmin.app.QubesBase, command: str) -> None: """Command that lists templates. :param args: Arguments received by the application. :param app: Qubes application object :param command: If set to ``list``, display a listing similar to ``dnf list``. If set to ``info``, display detailed template information similar to ``dnf info``. Otherwise, an ``AssertionError`` is raised. """ tpl_list = [] def append_list(data, status, install_time=None): _ = install_time # unused version_str = build_version_str( (data.epoch, data.version, data.release)) tpl_list.append((status, data.name, version_str, data.reponame)) def append_info(data, status, install_time=None): tpl_list.append((status, data, install_time)) def list_to_human_output(tpls): outputs = [] for status, grp in itertools.groupby(tpls, lambda x: x[0]): def convert(row): return row[1:] outputs.append((status, list(map(convert, grp)))) return outputs def list_to_machine_output(tpls): outputs = {} for status, grp in itertools.groupby(tpls, lambda x: x[0]): def convert(row): _, name, evr, reponame = row return {'name': name, 'evr': evr, 'reponame': reponame} outputs[status.value] = list(map(convert, grp)) return outputs def info_to_human_output(tpls): outputs = [] for status, grp in itertools.groupby(tpls, lambda x: x[0]): output = [] for _, data, install_time in grp: output.append(('Name', ':', data.name)) output.append(('Epoch', ':', data.epoch)) output.append(('Version', ':', data.version)) output.append(('Release', ':', data.release)) output.append(('Size', ':', qubesadmin.utils.size_to_human(data.dlsize))) output.append(('Repository', ':', data.reponame)) output.append(('Buildtime', ':', str(data.buildtime))) if install_time: output.append(('Install time', ':', str(install_time))) output.append(('URL', ':', data.url)) output.append(('License', ':', data.licence)) output.append(('Summary', ':', data.summary)) # Only show "Description" for the first line title = 'Description' for line in data.description.splitlines(): output.append((title, ':', line)) title = '' output.append((' ', ' ', ' ')) # empty line outputs.append((status, output)) return outputs def info_to_machine_output(tpls, replace_newline=True): outputs = {} for status, grp in itertools.groupby(tpls, lambda x: x[0]): output = [] for _, data, install_time in grp: name, epoch, version, release, reponame, dlsize, \ buildtime, licence, url, summary, description = data dlsize = str(dlsize) buildtime = buildtime.strftime(DATE_FMT) install_time = install_time if install_time else '' if replace_newline: description = description.replace('\n', '|') output.append({ 'name': name, 'epoch': epoch, 'version': version, 'release': release, 'reponame': reponame, 'size': dlsize, 'buildtime': buildtime, 'installtime': install_time, 'license': licence, 'url': url, 'summary': summary, 'description': description}) outputs[status.value] = output return outputs if command == 'list': append = append_list elif command == 'info': append = append_info else: assert False and 'Unknown command' def append_vm(vm, status): append(query_local(vm), status, vm.features['template-installtime']) def check_append(name, evr): return not args.templates or \ any(is_match_spec(name, *evr, spec)[0] for spec in args.templates) if not (args.installed or args.available or args.extras or args.upgrades): args.all = True if args.all or args.available or args.extras or args.upgrades: if args.templates: query_res_set: typing.Set[Template] = set() for spec in args.templates: query_res_set |= set(qrexec_repoquery(args, app, spec)) query_res = list(query_res_set) else: query_res = qrexec_repoquery(args, app) if args.installed or args.all: for vm in app.domains: if is_managed_template(vm) and \ check_append(vm.name, query_local_evr(vm)): append_vm(vm, TemplateState.INSTALLED) if args.available or args.all: # Spec should already be checked by repoquery for data in query_res: append(data, TemplateState.AVAILABLE) if args.extras: remote = set() for data in query_res: remote.add(data.name) for vm in app.domains: if is_managed_template(vm) and vm.name not in remote and \ check_append(vm.name, query_local_evr(vm)): append_vm(vm, TemplateState.EXTRA) if args.upgrades: local = {} for vm in app.domains: if is_managed_template(vm): local[vm.name] = query_local_evr(vm) # Spec should already be checked by repoquery for entry in query_res: evr = (entry.epoch, entry.version, entry.release) if entry.name in local: if rpm.labelCompare(local[entry.name], evr) < 0: append(entry, TemplateState.UPGRADABLE) if len(tpl_list) == 0: parser.error('No matching templates to list') if args.machine_readable: if command == 'info': tpl_list_dict = info_to_machine_output(tpl_list) elif command == 'list': tpl_list_dict = list_to_machine_output(tpl_list) for status, grp in tpl_list_dict.items(): for line in grp: print('|'.join([status] + list(line.values()))) elif args.machine_readable_json: if command == 'info': tpl_list_dict = \ info_to_machine_output(tpl_list, replace_newline=False) elif command == 'list': tpl_list_dict = list_to_machine_output(tpl_list) print(json.dumps(tpl_list_dict)) else: if command == 'info': tpl_list = info_to_human_output(tpl_list) elif command == 'list': tpl_list = list_to_human_output(tpl_list) for status, grp in tpl_list: print(status.title()) qubesadmin.tools.print_table(grp) def search(args: argparse.Namespace, app: qubesadmin.app.QubesBase) -> None: """Command that searches template details for given patterns. :param args: Arguments received by the application. :param app: Qubes application object """ # Search in both installed and available templates query_res = qrexec_repoquery(args, app) for vm in app.domains: if is_managed_template(vm): query_res.append(query_local(vm)) # Get latest version for each template query_res_tmp = [] for _, grp in itertools.groupby(sorted(query_res), lambda x: x[0]): def compare(lhs, rhs): return lhs if rpm.labelCompare(lhs[1:4], rhs[1:4]) > 0 else rhs query_res_tmp.append(functools.reduce(compare, grp)) query_res = query_res_tmp #pylint: disable=invalid-name WEIGHT_NAME_EXACT = 1 << 4 WEIGHT_NAME = 1 << 3 WEIGHT_SUMMARY = 1 << 2 WEIGHT_DESCRIPTION = 1 << 1 WEIGHT_URL = 1 << 0 WEIGHT_TO_FIELD = [ (WEIGHT_NAME_EXACT, 'Name'), (WEIGHT_NAME, 'Name'), (WEIGHT_SUMMARY, 'Summary'), (WEIGHT_DESCRIPTION, 'Description'), (WEIGHT_URL, 'URL')] search_res_by_idx: \ typing.Dict[int, typing.List[typing.Tuple[int, str, bool]]] = \ collections.defaultdict(list) for keyword in args.templates: for idx, entry in enumerate(query_res): needle_types = \ [(entry.name, WEIGHT_NAME), (entry.summary, WEIGHT_SUMMARY)] if args.all: needle_types += [(entry.description, WEIGHT_DESCRIPTION), (entry.url, WEIGHT_URL)] for key, weight in needle_types: if fnmatch.fnmatch(key, '*' + keyword + '*'): exact = keyword == key if exact and weight == WEIGHT_NAME: weight = WEIGHT_NAME_EXACT search_res_by_idx[idx].append((weight, keyword, exact)) if not args.all: keywords = set(args.templates) idxs = list(search_res_by_idx.keys()) for idx in idxs: if keywords != set(x[1] for x in search_res_by_idx[idx]): del search_res_by_idx[idx] def key_func(x): # ORDER BY weight DESC, list_of_needles ASC, name ASC idx, needles = x weight = sum(t[0] for t in needles) name = query_res[idx][0] return (-weight, needles, name) search_res = sorted(search_res_by_idx.items(), key=key_func) def gen_header(needles): fields = [] weight_types = set(x[0] for x in needles) for weight, field in WEIGHT_TO_FIELD: if weight in weight_types: fields.append(field) exact = all(x[-1] for x in needles) match = 'Exactly Matched' if exact else 'Matched' keywords = sorted(list(set(x[1] for x in needles))) return ' & '.join(fields) + ' ' + match + ': ' + ', '.join(keywords) last_header = '' for idx, needles in search_res: # Print headers cur_header = gen_header(needles) if last_header != cur_header: last_header = cur_header # XXX: The style is different from that of DNF print('===', cur_header, '===') print(query_res[idx].name, ':', query_res[idx].summary) def remove( args: argparse.Namespace, app: qubesadmin.app.QubesBase, disassoc: bool = False, purge: bool = False, dummy: str = 'dummy' ) -> None: """Command that remove templates. :param args: Arguments received by the application. :param app: Qubes application object :param disassoc: Whether to disassociate VMs from the templates :param purge: Whether to remove VMs based on the templates :param dummy: Name of dummy VM if disassoc is used """ # NOTE: While QubesArgumentParser provide similar functionality # it does not seem to work as a parent parser for tpl in args.templates: if tpl not in app.domains: parser.error("no such domain: '%s'" % tpl) remove_list = args.templates if purge: # Not disassociating first may result in dependency ordering issues disassoc = True # Remove recursively via BFS remove_set = set(remove_list) # visited idx = 0 while idx < len(remove_list): tpl = remove_list[idx] idx += 1 vm = app.domains[tpl] for holder, prop in qubesadmin.utils.vm_dependencies(app, vm): if holder is not None and holder.name not in remove_set: remove_list.append(holder.name) remove_set.add(holder.name) if not args.yes: repeat = 3 if purge else 1 for _ in range(repeat): confirm_action( 'This will completely remove the selected VM(s)...', remove_list) if disassoc: # Remove the dummy afterwards if we're purging remove_dummy = purge # Create dummy template; handle name collisions orig_dummy = dummy cnt = 1 while dummy in app.domains \ and app.domains[dummy].features.get( 'template-dummy', '0') == '0': dummy = '%s-%d' % (orig_dummy, cnt) cnt += 1 if dummy not in app.domains: dummy_vm = app.add_new_vm('TemplateVM', dummy, 'red') dummy_vm.features['template-dummy'] = 1 else: dummy_vm = app.domains[dummy] for tpl in remove_list: vm = app.domains[tpl] for holder, prop in qubesadmin.utils.vm_dependencies(app, vm): if holder: setattr(holder, prop, dummy_vm) holder.template = dummy_vm print("Property '%s' of '%s' set to '%s'." % ( prop, holder.name, dummy), file=sys.stderr) else: print("Global property '%s' set to ''." % prop, file=sys.stderr) setattr(app, prop, '') if remove_dummy: remove_list.append(dummy) if disassoc or purge: qubesadmin.tools.qvm_kill.main(['--'] + remove_list, app) qubesadmin.tools.qvm_remove.main(['--force', '--'] + remove_list, app) def clean(args: argparse.Namespace, app: qubesadmin.app.QubesBase) -> None: """Command that cleans the local package cache. :param args: Arguments received by the application. :param app: Qubes application object """ # TODO: More fine-grained options? _ = app # unused shutil.rmtree(args.cachedir) def repolist(args: argparse.Namespace, app: qubesadmin.app.QubesBase) -> None: """Command that lists configured repositories. :param args: Arguments received by the application. :param app: Qubes application object """ _ = app # unused # python-dnf is not packaged on Debian # As this is not an "essential operation", the module is imported here # instead of top-level so that other operations still work. try: import dnf except ModuleNotFoundError: print("Error: Python module 'dnf' not found.", file=sys.stderr) sys.exit(1) if not args.all and not args.disabled: args.enabled = True with tempfile.TemporaryDirectory(dir=TEMP_DIR) as reposdir: for idx, path in enumerate(args.repo_files): src = os.path.abspath(path) # Use index as file name in case of collisions dst = os.path.join(reposdir, '%d.repo' % idx) os.symlink(src, dst) conf = dnf.conf.Conf() conf.substitutions['releasever'] = args.releasever conf.reposdir = reposdir base = dnf.Base(conf) base.read_all_repos() if args.repoid: base.repos.get_matching('*').disable() for repo in args.repoid: base.repos.get_matching(repo).enable() else: for repo in args.enablerepo: base.repos.get_matching(repo).enable() for repo in args.disablerepo: base.repos.get_matching(repo).disable() repos: typing.List[dnf.repo.Repo] if args.repos: repos = [] for repo in args.repos: repos += list(base.repos.get_matching(repo)) repos = list(set(repos)) repos.sort(key=operator.attrgetter('id')) else: repos = list(base.repos.values()) repos.sort(key=operator.attrgetter('id')) table = [] for repo in repos: if args.all or (args.enabled == repo.enabled): state = 'enabled' if repo.enabled else 'disabled' table.append((repo.id, repo.name, state)) qubesadmin.tools.print_table(table) def main(args: typing.Optional[typing.Sequence[str]] = None, app: typing.Optional[qubesadmin.app.QubesBase] = None) -> int: """Main routine of **qvm-template**. :param args: Override arguments received by the application. Optional :param app: Override Qubes application object. Optional :return: Return code of the application """ p_args = parser.parse_args(args) if not p_args.command: parser.error('A command needs to be specified.') # If the user specified other repo files... if len(p_args.repo_files) > 1: # ...remove the default entry p_args.repo_files.pop(0) if app is None: app = qubesadmin.Qubes() if p_args.updatevm is UPDATEVM: p_args.updatevm = app.updatevm if p_args.refresh: qrexec_repoquery(p_args, app, refresh=True) if p_args.command == 'download': download(p_args, app) elif p_args.command == 'install': install(p_args, app) elif p_args.command == 'reinstall': install(p_args, app, version_selector=VersionSelector.REINSTALL, override_existing=True) elif p_args.command == 'downgrade': install(p_args, app, version_selector=VersionSelector.LATEST_LOWER, override_existing=True) elif p_args.command == 'upgrade': install(p_args, app, version_selector=VersionSelector.LATEST_HIGHER, override_existing=True) elif p_args.command == 'list': list_templates(p_args, app, 'list') elif p_args.command == 'info': list_templates(p_args, app, 'info') elif p_args.command == 'search': search(p_args, app) elif p_args.command == 'remove': remove(p_args, app, disassoc=p_args.disassoc) elif p_args.command == 'purge': remove(p_args, app, purge=True) elif p_args.command == 'clean': clean(p_args, app) elif p_args.command == 'repolist': repolist(p_args, app) else: parser.error('Command \'%s\' not supported.' % p_args.command) return 0 if __name__ == '__main__': sys.exit(main())