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errors.py
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errors.py
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#
# errors.py: exception classes used throughout anaconda
#
# Copyright (C) 2012 Red Hat, Inc. All rights reserved.
#
# 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/>.
from pyanaconda.core.i18n import _, C_
from pyanaconda.flags import flags
from pyanaconda.modules.common.errors.installation import BootloaderInstallationError, \
StorageInstallationError, NonCriticalInstallationError, PayloadInstallationError, \
InsightsClientMissingError, InsightsConnectError
from pyanaconda.modules.common.errors.payload import SourceSetupError
from pyanaconda.modules.common.errors.storage import UnusableStorageError
class ScriptError(Exception):
def __init__(self, lineno, details):
Exception.__init__(self)
self.lineno = lineno
self.details = details
class NonInteractiveError(Exception):
pass
class CmdlineError(NonInteractiveError):
pass
class RemovedModuleError(ImportError):
pass
class ExitError(RuntimeError):
pass
# These constants are returned by the callback in the ErrorHandler class.
# Each represents a different kind of action the caller can take:
#
# ERROR_RAISE - This is a fatal error, and anaconda can do nothing but quit
# or raise an exception. This then feeds into the exception
# handling framework.
#
# ERROR_CONTINUE - anaconda should continue with whatever it was going to do.
# This result comes from non-fatal errors, asking yes/no
# questions, and the like.
#
# ERROR_RETRY - This is a serious problem, but anaconda should attempt to
# try again. Continued failures may eventually result in an
# ERROR_RAISE.
ERROR_RAISE = 0
ERROR_CONTINUE = 1
ERROR_RETRY = 2
###
# TOP-LEVEL ERROR HANDLING OBJECT
###
class ErrorHandler(object):
"""This object makes up one part of anaconda's error handling system. This
part is the UI-agnostic error callback. Throughout anaconda, various
error conditions can occur in places that need to pop up a dialog, but
should not know anything about the type or details of the UI. In order
to accomplish this, each pyanaconda.ui.UserInterface subclass presents a
common set of dialog methods.
The entry point to these methods is through the cb method of this class,
which acts as a dispatcher to the appropriate handler, which in turn
pops up the correct kind of dialog. The result of all this is one of the
ERROR_* constants defined elsewhere in this module. The original calling
code must then interpret this result and take the appropriate action.
For details on the other parts of the error handling system, see the
documentation for pyanaconda.ui.UserInterface and pyanaconda.exception.
"""
def __init__(self, ui=None):
self.ui = ui
self.map = self._get_default_mapping()
def _get_default_mapping(self):
return {
# Anaconda errors
ScriptError.__name__: self._script_error_handler,
# Storage errors
UnusableStorageError.__name__: self._storage_reset_handler,
StorageInstallationError.__name__: self._storage_install_handler,
BootloaderInstallationError.__name__: self._bootloader_error_handler,
# Payload DBus errors
SourceSetupError.__name__: self._payload_setup_handler,
PayloadInstallationError.__name__: self._payload_install_handler,
# Subscription related errors
InsightsClientMissingError.__name__: self._insightsErrorHandler,
InsightsConnectError.__name__: self._insightsErrorHandler,
"KickstartRegistrationError": self._kickstartRegistrationErrorHandler,
# General installation errors.
NonCriticalInstallationError.__name__: self._non_critical_error_handler,
}
def _storage_install_handler(self, exn):
message = _("An error occurred while activating your storage configuration.")
details = str(exn)
self.ui.showDetailedError(message, details)
return ERROR_RAISE
def _storage_reset_handler(self, exn):
message = (_("There is a problem with your existing storage configuration "
"or your initial settings, for example a kickstart file. "
"You must resolve this matter before the installation can "
"proceed. There is a shell available for use which you "
"can access by pressing ctrl-alt-f1 and then ctrl-b 2."
"\n\nOnce you have resolved the issue you can retry the "
"storage scan. If you do not fix it you will have to exit "
"the installer."))
details = str(exn)
buttons = (C_("GUI|Storage Detailed Error Dialog", "_Exit Installer"),
C_("GUI|Storage Detailed Error Dialog", "_Retry"))
if self.ui.showDetailedError(message, details, buttons=buttons):
return ERROR_RETRY
else:
return ERROR_RAISE
def _script_error_handler(self, exn):
message = _("There was an error running the kickstart script at line "
"%(lineno)s. This is a fatal error and installation will be "
"aborted. The details of this error are:\n\n%(details)s") % \
{"lineno": exn.lineno, "details": exn.details}
self.ui.showError(message)
return ERROR_RAISE
def _payload_setup_handler(self, exn):
message = _("The following error occurred while setting up the payload. "
"This is a fatal error and installation will be aborted.")
message += "\n\n" + str(exn)
self.ui.showError(message)
return ERROR_RAISE
def _payload_install_handler(self, exn):
message = _("The following error occurred while installing the payload. "
"This is a fatal error and installation will be aborted.")
message += "\n\n" + str(exn)
self.ui.showError(message)
return ERROR_RAISE
def _bootloader_error_handler(self, exn):
message = _("The following error occurred while installing the boot loader. "
"The system will not be bootable. "
"Would you like to ignore this and continue with "
"installation?")
message += "\n\n" + str(exn)
if self.ui.showYesNoQuestion(message):
return ERROR_CONTINUE
else:
return ERROR_RAISE
def _non_critical_error_handler(self, exn):
message = _("The following error occurred during the installation:"
"\n\n{details}\n\nWould you like to ignore this and "
"continue with installation?").format(details=str(exn))
if self.ui.showYesNoQuestion(message):
return ERROR_CONTINUE
else:
return ERROR_RAISE
def _insightsErrorHandler(self, exn):
message = _("An error occurred during Red Hat Insights configuration. "
"Would you like to ignore this and continue with "
"installation?")
message += "\n\n" + str(exn)
if self.ui.showYesNoQuestion(message):
return ERROR_CONTINUE
else:
return ERROR_RAISE
def _kickstartRegistrationErrorHandler(self, exn):
message = _("An error occurred during registration attempt "
"triggered by the rhsm kickstart command. "
"This could have happened due to incorrect rhsm command arguments "
"or subscription infrastructure issues. "
"Would you like to ignore this and continue with "
"installation?")
message += "\n\n" + _("Error detail: ") + str(exn)
if self.ui.showYesNoQuestion(message):
return ERROR_CONTINUE
else:
return ERROR_RAISE
def cb(self, exn):
"""This method is the callback that all error handling should pass
through. The return value is one of the ERROR_* constants defined
in this module, though the exact constant returned depends on the
kind of exception being handled.
Arguments:
exn -- An instance of some Exception.
"""
rc = ERROR_RAISE
if not self.ui:
raise exn
if not flags.ksprompt:
raise NonInteractiveError("Non interactive installation failed: %s" % exn)
if exn.__class__.__name__ in self.map:
rc = self.map[exn.__class__.__name__](exn)
return rc
# Create a singleton of the ErrorHandler class. It is up to the UserInterface
# subclass to set errorHandler.ui before this class is ever used, or there will
# be trouble.
errorHandler = ErrorHandler()