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system_upgrade.py
# -*- coding: utf-8 -*- # # Copyright (c) 2015-2020 Red Hat, Inc. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 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 General Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program. If not, see <http://www.gnu.org/licenses/>. # # Author(s): Will Woods <wwoods@redhat.com> """system_upgrade.py - DNF plugin to handle major-version system upgrades.""" from subprocess import call, Popen, check_output, CalledProcessError import json import os import os.path import re import sys import uuid from systemd import journal from dnfpluginscore import _, logger import dnf import dnf.cli from dnf.cli import CliError from dnf.i18n import ucd import dnf.transaction from dnf.transaction_sr import serialize_transaction, TransactionReplay import libdnf.conf # Translators: This string is only used in unit tests. _("the color of the sky") DOWNLOAD_FINISHED_ID = uuid.UUID('9348174c5cc74001a71ef26bd79d302e') REBOOT_REQUESTED_ID = uuid.UUID('fef1cc509d5047268b83a3a553f54b43') UPGRADE_STARTED_ID = uuid.UUID('3e0a5636d16b4ca4bbe5321d06c6aa62') UPGRADE_FINISHED_ID = uuid.UUID('8cec00a1566f4d3594f116450395f06c') ID_TO_IDENTIFY_BOOTS = UPGRADE_STARTED_ID PLYMOUTH = '/usr/bin/plymouth' RELEASEVER_MSG = _( "Need a --releasever greater than the current system version.") DOWNLOAD_FINISHED_MSG = _( # Translators: do not change "reboot" here "Download complete! Use 'dnf {command} reboot' to start the upgrade.\n" "To remove cached metadata and transaction use 'dnf {command} clean'") CANT_RESET_RELEASEVER = _( "Sorry, you need to use 'download --releasever' instead of '--network'") STATE_VERSION = 3 # --- Miscellaneous helper functions ------------------------------------------ def reboot(poweroff = False): if os.getenv("DNF_SYSTEM_UPGRADE_NO_REBOOT", default=False): logger.info(_("Reboot turned off, not rebooting.")) else: if poweroff: Popen(["systemctl", "poweroff"]) else: Popen(["systemctl", "reboot"]) def get_url_from_os_release(): key = "UPGRADE_GUIDE_URL=" for path in ["/etc/os-release", "/usr/lib/os-release"]: try: with open(path) as release_file: for line in release_file: line = line.strip() if line.startswith(key): return line[len(key):].strip('"') except IOError: continue return None # DNF-FIXME: dnf.util.clear_dir() doesn't delete regular files :/ def clear_dir(path, ignore=[]): if not os.path.isdir(path): return for entry in os.listdir(path): fullpath = os.path.join(path, entry) if fullpath in ignore: continue try: if os.path.isdir(fullpath): dnf.util.rm_rf(fullpath) else: os.unlink(fullpath) except OSError: pass def check_release_ver(conf, target=None): if dnf.rpm.detect_releasever(conf.installroot) == conf.releasever: raise CliError(RELEASEVER_MSG) if target and target != conf.releasever: # it's too late to set releasever here, so this can't work. # (see https://bugzilla.redhat.com/show_bug.cgi?id=1212341) raise CliError(CANT_RESET_RELEASEVER) def disable_blanking(): try: tty = open('/dev/tty0', 'wb') tty.write(b'\33[9;0]') except Exception as e: print(_("Screen blanking can't be disabled: %s") % e) # --- State object - for tracking upgrade state between runs ------------------ # DNF-INTEGRATION-NOTE: basically the same thing as dnf.persistor.JSONDB class State(object): def __init__(self, statefile): self.statefile = statefile self._data = {} self._read() def _read(self): try: with open(self.statefile) as fp: self._data = json.load(fp) except IOError: self._data = {} except ValueError: self._data = {} logger.warning(_("Failed loading state file: %s, continuing with " "empty state."), self.statefile) def write(self): dnf.util.ensure_dir(os.path.dirname(self.statefile)) with open(self.statefile, 'w') as outf: json.dump(self._data, outf, indent=4, sort_keys=True) def clear(self): if os.path.exists(self.statefile): os.unlink(self.statefile) self._read() def __enter__(self): return self def __exit__(self, exc_type, exc_value, traceback): if exc_type is None: self.write() # helper function for creating properties. pylint: disable=protected-access def _prop(option): # pylint: disable=no-self-argument def setprop(self, value): self._data[option] = value def getprop(self): return self._data.get(option) return property(getprop, setprop) # !!! Increase STATE_VERSION for any changes in data structure like a new property or a new # data structure !!! state_version = _prop("state_version") download_status = _prop("download_status") destdir = _prop("destdir") target_releasever = _prop("target_releasever") system_releasever = _prop("system_releasever") gpgcheck = _prop("gpgcheck") # list of repos with gpgcheck=True gpgcheck_repos = _prop("gpgcheck_repos") # list of repos with repo_gpgcheck=True repo_gpgcheck_repos = _prop("repo_gpgcheck_repos") upgrade_status = _prop("upgrade_status") upgrade_command = _prop("upgrade_command") distro_sync = _prop("distro_sync") poweroff_after = _prop("poweroff_after") enable_disable_repos = _prop("enable_disable_repos") module_platform_id = _prop("module_platform_id") # --- Plymouth output helpers ------------------------------------------------- class PlymouthOutput(object): """A plymouth output helper class. Filters duplicate calls, and stops calling the plymouth binary if we fail to contact it. """ def __init__(self): self.alive = True self._last_args = dict() self._last_msg = None def _plymouth(self, cmd, *args): dupe_cmd = (args == self._last_args.get(cmd)) if (self.alive and not dupe_cmd) or cmd == '--ping': try: self.alive = (call((PLYMOUTH, cmd) + args) == 0) except OSError: self.alive = False self._last_args[cmd] = args return self.alive def ping(self): return self._plymouth("--ping") def message(self, msg): if self._last_msg and self._last_msg != msg: self._plymouth("hide-message", "--text", self._last_msg) self._last_msg = msg return self._plymouth("display-message", "--text", msg) def set_mode(self): mode = 'updates' try: s = check_output([PLYMOUTH, '--help']) if re.search('--system-upgrade', ucd(s)): mode = 'system-upgrade' except (CalledProcessError, OSError): pass return self._plymouth("change-mode", "--" + mode) def progress(self, percent): return self._plymouth("system-update", "--progress", str(percent)) # A single PlymouthOutput instance for us to use within this module Plymouth = PlymouthOutput() # A TransactionProgress class that updates plymouth for us. class PlymouthTransactionProgress(dnf.callback.TransactionProgress): # pylint: disable=too-many-arguments def progress(self, package, action, ti_done, ti_total, ts_done, ts_total): self._update_plymouth(package, action, ts_done, ts_total) def _update_plymouth(self, package, action, current, total): # Prevents quick jumps of progressbar when pretrans scriptlets # and TRANS_PREPARATION are reported as 1/1 if total == 1: return # Verification goes through all the packages again, # which resets the "current" param value, this prevents # resetting of the progress bar as well. (Rhbug:1809096) if action != dnf.callback.PKG_VERIFY: Plymouth.progress(int(90.0 * current / total)) else: Plymouth.progress(90 + int(10.0 * current / total)) Plymouth.message(self._fmt_event(package, action, current, total)) def _fmt_event(self, package, action, current, total): action = dnf.transaction.ACTIONS.get(action, action) return "[%d/%d] %s %s..." % (current, total, action, package) # --- journal helpers ------------------------------------------------- def find_boots(message_id): """Find all boots with this message id. Returns the entries of all found boots. """ j = journal.Reader() j.add_match(MESSAGE_ID=message_id.hex, # identify the message _UID=0) # prevent spoofing of logs oldboot = None for entry in j: boot = entry['_BOOT_ID'] if boot == oldboot: continue oldboot = boot yield entry def list_logs(): print(_('The following boots appear to contain upgrade logs:')) n = -1 for n, entry in enumerate(find_boots(ID_TO_IDENTIFY_BOOTS)): print('{} / {.hex}: {:%Y-%m-%d %H:%M:%S} {}→{}'.format( n + 1, entry['_BOOT_ID'], entry['__REALTIME_TIMESTAMP'], entry.get('SYSTEM_RELEASEVER', '??'), entry.get('TARGET_RELEASEVER', '??'))) if n == -1: print(_('-- no logs were found --')) def pick_boot(message_id, n): boots = list(find_boots(message_id)) # Positive indices index all found boots starting with 1 and going forward, # zero is the current boot, and -1, -2, -3 are previous going backwards. # This is the same as journalctl. try: if n == 0: raise IndexError if n > 0: n -= 1 return boots[n]['_BOOT_ID'] except IndexError: raise CliError(_("Cannot find logs with this index.")) def show_log(n): boot_id = pick_boot(ID_TO_IDENTIFY_BOOTS, n) process = Popen(['journalctl', '--boot', boot_id.hex]) process.wait() rc = process.returncode if rc == 1: raise dnf.exceptions.Error(_("Unable to match systemd journal entry")) CMDS = ['download', 'clean', 'reboot', 'upgrade', 'log'] # --- The actual Plugin and Command objects! ---------------------------------- class SystemUpgradePlugin(dnf.Plugin): name = 'system-upgrade' def __init__(self, base, cli): super(SystemUpgradePlugin, self).__init__(base, cli) if cli: cli.register_command(SystemUpgradeCommand) cli.register_command(OfflineUpgradeCommand) cli.register_command(OfflineDistrosyncCommand) class SystemUpgradeCommand(dnf.cli.Command): aliases = ('system-upgrade', 'fedup',) summary = _("Prepare system for upgrade to a new release") DATADIR = 'var/lib/dnf/system-upgrade' def __init__(self, cli): super(SystemUpgradeCommand, self).__init__(cli) self.datadir = os.path.join(cli.base.conf.installroot, self.DATADIR) self.transaction_file = os.path.join(self.datadir, 'system-upgrade-transaction.json') self.magic_symlink = os.path.join(cli.base.conf.installroot, 'system-update') self.state = State(os.path.join(self.datadir, 'system-upgrade-state.json')) @staticmethod def set_argparser(parser): parser.add_argument("--no-downgrade", dest='distro_sync', action='store_false', help=_("keep installed packages if the new " "release's version is older")) parser.add_argument('--poweroff', dest='poweroff_after', action='store_true', help=_("power off system after the operation " "is completed")) parser.add_argument('tid', nargs=1, choices=CMDS, metavar="[%s]" % "|".join(CMDS)) parser.add_argument('--number', type=int, help=_('which logs to show')) def log_status(self, message, message_id): """Log directly to the journal.""" journal.send(message, MESSAGE_ID=message_id, PRIORITY=journal.LOG_NOTICE, SYSTEM_RELEASEVER=self.state.system_releasever, TARGET_RELEASEVER=self.state.target_releasever, DNF_VERSION=dnf.const.VERSION) def pre_configure(self): self._call_sub("check") self._call_sub("pre_configure") def configure(self): self._call_sub("configure") def run(self): self._call_sub("run") def run_transaction(self): self._call_sub("transaction") def run_resolved(self): self._call_sub("resolved") def _call_sub(self, name): subfunc = getattr(self, name + '_' + self.opts.tid[0], None) if callable(subfunc): subfunc() def _check_state_version(self, command): if self.state.state_version != STATE_VERSION: msg = _("Incompatible version of data. Rerun 'dnf {command} download [OPTIONS]'" "").format(command=command) raise CliError(msg) def _set_cachedir(self): # set download directories from json state file self.base.conf.cachedir = self.datadir self.base.conf.destdir = self.state.destdir if self.state.destdir else None def _get_forward_reverse_pkg_reason_pairs(self): """ forward = {repoid:{pkg_nevra: {tsi.action: tsi.reason}} reverse = {pkg_nevra: {tsi.action: tsi.reason}} :return: forward, reverse """ backward_action = set(dnf.transaction.BACKWARD_ACTIONS + [libdnf.transaction.TransactionItemAction_REINSTALLED]) forward_actions = set(dnf.transaction.FORWARD_ACTIONS) forward = {} reverse = {} for tsi in self.cli.base.transaction: if tsi.action in forward_actions: pkg = tsi.pkg forward.setdefault(pkg.repo.id, {}).setdefault( str(pkg), {})[tsi.action] = tsi.reason elif tsi.action in backward_action: reverse.setdefault(str(tsi.pkg), {})[tsi.action] = tsi.reason return forward, reverse # == pre_configure_*: set up action-specific demands ========================== def pre_configure_download(self): # only download subcommand accepts --destdir command line option self.base.conf.cachedir = self.datadir self.base.conf.destdir = self.opts.destdir if self.opts.destdir else None if 'offline-distrosync' == self.opts.command and not self.opts.distro_sync: raise CliError( _("Command 'offline-distrosync' cannot be used with --no-downgrade option")) elif 'offline-upgrade' == self.opts.command: self.opts.distro_sync = False def pre_configure_reboot(self): self._set_cachedir() def pre_configure_upgrade(self): self._set_cachedir() if self.state.enable_disable_repos: self.opts.repos_ed = self.state.enable_disable_repos self.base.conf.releasever = self.state.target_releasever def pre_configure_clean(self): self._set_cachedir() # == configure_*: set up action-specific demands ========================== def configure_download(self): if 'system-upgrade' == self.opts.command or 'fedup' == self.opts.command: logger.warning(_('WARNING: this operation is not supported on the RHEL distribution. ' 'Proceed at your own risk.')) help_url = get_url_from_os_release() if help_url: msg = _('Additional information for System Upgrade: {}') logger.info(msg.format(ucd(help_url))) if self.base._promptWanted(): msg = _('Before you continue ensure that your system is fully upgraded by running ' '"dnf --refresh upgrade". Do you want to continue') if self.base.conf.assumeno or not self.base.output.userconfirm( msg='{} [y/N]: '.format(msg), defaultyes_msg='{} [Y/n]: '.format(msg)): logger.error(_("Operation aborted.")) sys.exit(1) check_release_ver(self.base.conf, target=self.opts.releasever) elif 'offline-upgrade' == self.opts.command: self.cli._populate_update_security_filter(self.opts) self.cli.demands.root_user = True self.cli.demands.resolving = True self.cli.demands.available_repos = True self.cli.demands.sack_activation = True self.cli.demands.freshest_metadata = True # We want to do the depsolve / download / transaction-test, but *not* # run the actual RPM transaction to install the downloaded packages. # Setting the "test" flag makes the RPM transaction a test transaction, # so nothing actually gets installed. # (It also means that we run two test transactions in a row, which is # kind of silly, but that's something for DNF to fix...) self.base.conf.tsflags += ["test"] def configure_reboot(self): # FUTURE: add a --debug-shell option to enable debug shell: # systemctl add-wants system-update.target debug-shell.service self.cli.demands.root_user = True def configure_upgrade(self): # same as the download, but offline and non-interactive. so... self.cli.demands.root_user = True self.cli.demands.resolving = True self.cli.demands.available_repos = True self.cli.demands.sack_activation = True # use the saved value for --allowerasing, etc. self.opts.distro_sync = self.state.distro_sync if self.state.gpgcheck is not None: self.base.conf.gpgcheck = self.state.gpgcheck if self.state.gpgcheck_repos is not None: for repo in self.base.repos.values(): repo.gpgcheck = repo.id in self.state.gpgcheck_repos if self.state.repo_gpgcheck_repos is not None: for repo in self.base.repos.values(): repo.repo_gpgcheck = repo.id in self.state.repo_gpgcheck_repos self.base.conf.module_platform_id = self.state.module_platform_id # don't try to get new metadata, 'cuz we're offline self.cli.demands.cacheonly = True # and don't ask any questions (we confirmed all this beforehand) self.base.conf.assumeyes = True self.cli.demands.transaction_display = PlymouthTransactionProgress() # upgrade operation already removes all element that must be removed. Additional removal # could trigger unwanted changes in transaction. self.base.conf.clean_requirements_on_remove = False self.base.conf.install_weak_deps = False def configure_clean(self): self.cli.demands.root_user = True def configure_log(self): pass # == check_*: do any action-specific checks =============================== def check_reboot(self): if not self.state.download_status == 'complete': raise CliError(_("system is not ready for upgrade")) self._check_state_version(self.opts.command) if self.state.upgrade_command != self.opts.command: msg = _("the transaction was not prepared for '{command}'. " "Rerun 'dnf {command} download [OPTIONS]'").format(command=self.opts.command) raise CliError(msg) if os.path.lexists(self.magic_symlink): raise CliError(_("upgrade is already scheduled")) dnf.util.ensure_dir(self.datadir) # FUTURE: checkRPMDBStatus(self.state.download_transaction_id) def check_upgrade(self): if not os.path.lexists(self.magic_symlink): logger.info(_("trigger file does not exist. exiting quietly.")) raise SystemExit(0) if os.readlink(self.magic_symlink) != self.datadir: logger.info(_("another upgrade tool is running. exiting quietly.")) raise SystemExit(0) # Delete symlink ASAP to avoid reboot loops dnf.yum.misc.unlink_f(self.magic_symlink) command = self.state.upgrade_command if not command: command = self.opts.command self._check_state_version(command) if not self.state.upgrade_status == 'ready': msg = _("use 'dnf {command} reboot' to begin the upgrade").format(command=command) raise CliError(msg) # == run_*: run the action/prep the transaction =========================== def run_prepare(self): # make the magic symlink os.symlink(self.datadir, self.magic_symlink) # set upgrade_status so that the upgrade can run with self.state as state: state.upgrade_status = 'ready' def run_reboot(self): self.run_prepare() if not self.opts.tid[0] == "reboot": return self.state.poweroff_after = self.opts.poweroff_after self.log_status(_("Rebooting to perform upgrade."), REBOOT_REQUESTED_ID) # Explicit write since __exit__ doesn't seem to get called when rebooting self.state.write() reboot() def run_download(self): # Mark everything in the world for upgrade/sync if self.opts.distro_sync: self.base.distro_sync() else: self.base.upgrade_all() if self.opts.command not in ['offline-upgrade', 'offline-distrosync']: # Mark all installed groups and environments for upgrade self.base.read_comps() installed_groups = [g.id for g in self.base.comps.groups if self.base.history.group.get(g.id)] if installed_groups: self.base.env_group_upgrade(installed_groups) installed_environments = [g.id for g in self.base.comps.environments if self.base.history.env.get(g.id)] if installed_environments: self.base.env_group_upgrade(installed_environments) with self.state as state: state.download_status = 'downloading' state.target_releasever = self.base.conf.releasever state.destdir = self.base.conf.destdir def run_upgrade(self): # change the upgrade status (so we can detect crashed upgrades later) command = '' with self.state as state: state.upgrade_status = 'incomplete' command = state.upgrade_command if command == 'offline-upgrade': msg = _("Starting offline upgrade. This will take a while.") elif command == 'offline-distrosync': msg = _("Starting offline distrosync. This will take a while.") else: msg = _("Starting system upgrade. This will take a while.") self.log_status(msg, UPGRADE_STARTED_ID) # reset the splash mode and let the user know we're running Plymouth.set_mode() Plymouth.progress(0) Plymouth.message(msg) # disable screen blanking disable_blanking() self.replay = TransactionReplay(self.base, self.transaction_file) self.replay.run() def run_clean(self): logger.info(_("Cleaning up downloaded data...")) # Don't delete persistor, it contains paths for downloaded packages # that are used by dnf during finalizing base to clean them up clear_dir(self.base.conf.cachedir, [dnf.persistor.TempfilePersistor(self.base.conf.cachedir).db_path]) with self.state as state: state.download_status = None state.state_version = None state.upgrade_status = None state.upgrade_command = None state.destdir = None def run_log(self): if self.opts.number: show_log(self.opts.number) else: list_logs() # == resolved_*: do staff after succesful resolvement ===================== def resolved_upgrade(self): """Adjust transaction reasons according to stored values""" self.replay.post_transaction() # == transaction_*: do stuff after a successful transaction =============== def transaction_download(self): transaction = self.base.history.get_current() if not transaction.packages(): logger.info(_("The system-upgrade transaction is empty, your system is already up-to-date.")) return data = serialize_transaction(transaction) try: with open(self.transaction_file, "w") as f: json.dump(data, f, indent=4, sort_keys=True) f.write("\n") print(_("Transaction saved to {}.").format(self.transaction_file)) except OSError as e: raise dnf.cli.CliError(_('Error storing transaction: {}').format(str(e))) # Okay! Write out the state so the upgrade can use it. system_ver = dnf.rpm.detect_releasever(self.base.conf.installroot) with self.state as state: state.download_status = 'complete' state.state_version = STATE_VERSION state.distro_sync = self.opts.distro_sync state.gpgcheck = self.base.conf.gpgcheck state.gpgcheck_repos = [ repo.id for repo in self.base.repos.values() if repo.gpgcheck] state.repo_gpgcheck_repos = [ repo.id for repo in self.base.repos.values() if repo.repo_gpgcheck] state.system_releasever = system_ver state.target_releasever = self.base.conf.releasever state.module_platform_id = self.base.conf.module_platform_id state.enable_disable_repos = self.opts.repos_ed state.destdir = self.base.conf.destdir state.upgrade_command = self.opts.command msg = DOWNLOAD_FINISHED_MSG.format(command=self.opts.command) logger.info(msg) self.log_status(_("Download finished."), DOWNLOAD_FINISHED_ID) def transaction_upgrade(self): if self.state.poweroff_after: upgrade_complete_msg = _("Upgrade complete! Cleaning up and powering off...") else: upgrade_complete_msg = _("Upgrade complete! Cleaning up and rebooting...") Plymouth.message(upgrade_complete_msg) self.log_status(upgrade_complete_msg, UPGRADE_FINISHED_ID) self.run_clean() if self.opts.tid[0] == "upgrade": reboot(self.state.poweroff_after) class OfflineUpgradeCommand(SystemUpgradeCommand): aliases = ('offline-upgrade',) summary = _("Prepare offline upgrade of the system") class OfflineDistrosyncCommand(SystemUpgradeCommand): aliases = ('offline-distrosync',) summary = _("Prepare offline distrosync of the system")
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