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File name : errors.py

Content :# # 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 from pyanaconda.modules.common.errors.storage import UnusableStorageError __all__ = ["ERROR_RAISE", "ERROR_CONTINUE", "ERROR_RETRY", "errorHandler", "InvalidImageSizeError", "MissingImageError", "ScriptError", "NonInteractiveError", "CmdlineError", "ExitError"] class InvalidImageSizeError(Exception): def __init__(self, message, filename): Exception.__init__(self, message) self.filename = filename class MissingImageError(Exception): pass 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 PasswordCryptError(Exception): def __init__(self, algo): Exception.__init__(self) self.algo = algo 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 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 _invalidImageSizeHandler(self, exn): message = _("The ISO image %s has a size which is not " "a multiple of 2048 bytes. This may mean " "it was corrupted on transfer to this computer." "\n\n" "It is recommended that you exit and abort your " "installation, but you can choose to continue if " "you think this is in error. Would you like to " "continue using this image?") % exn.filename if self.ui.showYesNoQuestion(message): return ERROR_CONTINUE else: return ERROR_RAISE def _missingImageHandler(self, exn): message = _("The installer has tried to mount the " "installation image, but cannot find it on " "the hard drive.\n\n" "Should I try again to locate the image?") if self.ui.showYesNoQuestion(message): return ERROR_RETRY else: return ERROR_RAISE def _noSuchGroupHandler(self, exn): if exn.required: message = _("The group '%s' is required for this installation. " "This group does not exist. This is a fatal error and " "installation will be aborted.") % exn.group self.ui.showError(message) return ERROR_RAISE elif exn.adding: message = _("You have specified that the group '%s' should be " "installed. This group does not exist. Would you like " "to ignore this group and continue with " "installation?") % exn.group else: message = _("You have specified that the group '%s' should be " "excluded from installation. This group does not exist. " "Would you like to ignore this group and continue with " "installation?") % exn.group if self.ui.showYesNoQuestion(message): return ERROR_CONTINUE else: return ERROR_RAISE def _install_specs_handler(self, exn): broken_packages = exn.error_pkg_specs broken_groups_modules = exn.error_group_specs module_depsolv_errors = exn.module_depsolv_errors # We use the nice exception string representation # provided by DNF as the base of our error message. message = "{}\n\n".format(exn) # if we have at least one broken package, group or module we will abort the installation if broken_packages or broken_groups_modules or module_depsolv_errors: message = message + _("Some packages, groups or modules are broken, the installation " "will be aborted.") self.ui.showError(message) return ERROR_RAISE # "just" missing packages, groups or modules - we give the user an option to continue else: message = message + _("Would you like to ignore this and continue with installation?") if self.ui.showYesNoQuestion(message): return ERROR_CONTINUE else: return ERROR_RAISE def _no_module_stream_specified(self, exn): message = _("Stream was not specified for a module without a default stream. This is " "a fatal error and installation will be aborted. The details " "of this error are:\n\n%(exception)s") % \ {"exception": exn} self.ui.showError(message) return ERROR_RAISE def _multiple_module_streams_specified(self, exn): message = _("Multiple streams have been specified for a single module. This is " "a fatal error and installation will be aborted. The details " "of this error are:\n\n%(exception)s") % \ {"exception": exn} self.ui.showError(message) return ERROR_RAISE def _scriptErrorHandler(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 _payloadInstallHandler(self, exn): message = _("The following error occurred while installing. This is " "a fatal error and installation will be aborted.") message += "\n\n" + str(exn) self.ui.showError(message) return ERROR_RAISE def _dependencyErrorHandler(self, exn): message = _("The following software marked for installation has errors.\n" "This is likely caused by an error with your installation source.") details = str(exn) self.ui.showDetailedError(message, details) return ERROR_RAISE def _bootLoaderErrorHandler(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 _passwordCryptErrorHandler(self, exn): message = _("Unable to encrypt password: unsupported algorithm %s") % exn.algo self.ui.showError(message) 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 _subscriptionTokenTransferErrorHandler(self, exn): message = _("Failed to enable Red Hat subscription on the " "installed system." "\n\n" "Your Red Hat subscription might be invalid " "(such as due to an expired developer subscription)." "\n\n" "Would you like to ignore this and continue with " "installation?") 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) _map = { StorageInstallationError.__name__: self._storage_install_handler, UnusableStorageError.__name__: self._storage_reset_handler, "InvalidImageSizeError": self._invalidImageSizeHandler, "MissingImageError": self._missingImageHandler, "NoSuchGroup": self._noSuchGroupHandler, "NoStreamSpecifiedException": self._no_module_stream_specified, "InstallMoreStreamsException": self._multiple_module_streams_specified, "MarkingErrors": self._install_specs_handler, "ScriptError": self._scriptErrorHandler, "PayloadInstallError": self._payloadInstallHandler, "DependencyError": self._dependencyErrorHandler, BootloaderInstallationError.__name__: self._bootLoaderErrorHandler, "PasswordCryptError": self._passwordCryptErrorHandler, "InsightsClientMissingError": self._insightsErrorHandler, "InsightsConnectError": self._insightsErrorHandler, "KickstartRegistrationError": self._kickstartRegistrationErrorHandler, "SubscriptionTokenTransferError": self._subscriptionTokenTransferErrorHandler, } if exn.__class__.__name__ in _map: rc = _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()

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