~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006, 2007, 2008 Canonical Ltd
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Exceptions for bzr, and reporting of them.
"""

from bzrlib import (
    osutils,
    symbol_versioning,
    )
from bzrlib.patches import (
    MalformedHunkHeader,
    MalformedLine,
    MalformedPatchHeader,
    PatchConflict,
    PatchSyntax,
    )


# TODO: is there any value in providing the .args field used by standard
# python exceptions?   A list of values with no names seems less useful
# to me.

# TODO: Perhaps convert the exception to a string at the moment it's
# constructed to make sure it will succeed.  But that says nothing about
# exceptions that are never raised.

# TODO: selftest assertRaises should probably also check that every error
# raised can be formatted as a string successfully, and without giving
# 'unprintable'.


# return codes from the bzr program
EXIT_OK = 0
EXIT_ERROR = 3
EXIT_INTERNAL_ERROR = 4


class BzrError(StandardError):
    """
    Base class for errors raised by bzrlib.

    :cvar internal_error: if True this was probably caused by a bzr bug and
    should be displayed with a traceback; if False (or absent) this was
    probably a user or environment error and they don't need the gory details.
    (That can be overridden by -Derror on the command line.)

    :cvar _fmt: Format string to display the error; this is expanded
    by the instance's dict.
    """

    internal_error = False

    def __init__(self, msg=None, **kwds):
        """Construct a new BzrError.

        There are two alternative forms for constructing these objects.
        Either a preformatted string may be passed, or a set of named
        arguments can be given.  The first is for generic "user" errors which
        are not intended to be caught and so do not need a specific subclass.
        The second case is for use with subclasses that provide a _fmt format
        string to print the arguments.

        Keyword arguments are taken as parameters to the error, which can
        be inserted into the format string template.  It's recommended
        that subclasses override the __init__ method to require specific
        parameters.

        :param msg: If given, this is the literal complete text for the error,
           not subject to expansion. 'msg' is used instead of 'message' because
           python evolved and, in 2.6, forbids the use of 'message'.
        """
        StandardError.__init__(self)
        if msg is not None:
            # I was going to deprecate this, but it actually turns out to be
            # quite handy - mbp 20061103.
            self._preformatted_string = msg
        else:
            self._preformatted_string = None
            for key, value in kwds.items():
                setattr(self, key, value)

    def _format(self):
        s = getattr(self, '_preformatted_string', None)
        if s is not None:
            # contains a preformatted message
            return s
        try:
            fmt = self._get_format_string()
            if fmt:
                d = dict(self.__dict__)
                s = fmt % d
                # __str__() should always return a 'str' object
                # never a 'unicode' object.
                return s
        except (AttributeError, TypeError, NameError, ValueError, KeyError), e:
            return 'Unprintable exception %s: dict=%r, fmt=%r, error=%r' \
                % (self.__class__.__name__,
                   self.__dict__,
                   getattr(self, '_fmt', None),
                   e)

    def __unicode__(self):
        u = self._format()
        if isinstance(u, str):
            # Try decoding the str using the default encoding.
            u = unicode(u)
        elif not isinstance(u, unicode):
            # Try to make a unicode object from it, because __unicode__ must
            # return a unicode object.
            u = unicode(u)
        return u

    def __str__(self):
        s = self._format()
        if isinstance(s, unicode):
            s = s.encode('utf8')
        else:
            # __str__ must return a str.
            s = str(s)
        return s

    def __repr__(self):
        return '%s(%s)' % (self.__class__.__name__, str(self))

    def _get_format_string(self):
        """Return format string for this exception or None"""
        fmt = getattr(self, '_fmt', None)
        if fmt is not None:
            return fmt
        fmt = getattr(self, '__doc__', None)
        if fmt is not None:
            symbol_versioning.warn("%s uses its docstring as a format, "
                    "it should use _fmt instead" % self.__class__.__name__,
                    DeprecationWarning)
            return fmt
        return 'Unprintable exception %s: dict=%r, fmt=%r' \
            % (self.__class__.__name__,
               self.__dict__,
               getattr(self, '_fmt', None),
               )

    def __eq__(self, other):
        if self.__class__ is not other.__class__:
            return NotImplemented
        return self.__dict__ == other.__dict__


class InternalBzrError(BzrError):
    """Base class for errors that are internal in nature.

    This is a convenience class for errors that are internal. The
    internal_error attribute can still be altered in subclasses, if needed.
    Using this class is simply an easy way to get internal errors.
    """

    internal_error = True


class BzrNewError(BzrError):
    """Deprecated error base class."""
    # base classes should override the docstring with their human-
    # readable explanation

    def __init__(self, *args, **kwds):
        # XXX: Use the underlying BzrError to always generate the args
        # attribute if it doesn't exist.  We can't use super here, because
        # exceptions are old-style classes in python2.4 (but new in 2.5).
        # --bmc, 20060426
        symbol_versioning.warn('BzrNewError was deprecated in bzr 0.13; '
             'please convert %s to use BzrError instead'
             % self.__class__.__name__,
             DeprecationWarning,
             stacklevel=2)
        BzrError.__init__(self, *args)
        for key, value in kwds.items():
            setattr(self, key, value)

    def __str__(self):
        try:
            # __str__() should always return a 'str' object
            # never a 'unicode' object.
            s = self.__doc__ % self.__dict__
            if isinstance(s, unicode):
                return s.encode('utf8')
            return s
        except (TypeError, NameError, ValueError, KeyError), e:
            return 'Unprintable exception %s(%r): %r' \
                % (self.__class__.__name__,
                   self.__dict__, e)


class AlreadyBuilding(BzrError):

    _fmt = "The tree builder is already building a tree."


class BranchError(BzrError):
    """Base class for concrete 'errors about a branch'."""

    def __init__(self, branch):
        BzrError.__init__(self, branch=branch)


class BzrCheckError(InternalBzrError):

    _fmt = "Internal check failed: %(msg)s"

    def __init__(self, msg):
        BzrError.__init__(self)
        self.msg = msg


class DirstateCorrupt(BzrError):

    _fmt = "The dirstate file (%(state)s) appears to be corrupt: %(msg)s"

    def __init__(self, state, msg):
        BzrError.__init__(self)
        self.state = state
        self.msg = msg


class DisabledMethod(InternalBzrError):

    _fmt = "The smart server method '%(class_name)s' is disabled."

    def __init__(self, class_name):
        BzrError.__init__(self)
        self.class_name = class_name


class IncompatibleAPI(BzrError):

    _fmt = 'The API for "%(api)s" is not compatible with "%(wanted)s". '\
        'It supports versions "%(minimum)s" to "%(current)s".'

    def __init__(self, api, wanted, minimum, current):
        self.api = api
        self.wanted = wanted
        self.minimum = minimum
        self.current = current


class InProcessTransport(BzrError):

    _fmt = "The transport '%(transport)s' is only accessible within this " \
        "process."

    def __init__(self, transport):
        self.transport = transport


class InvalidEntryName(InternalBzrError):

    _fmt = "Invalid entry name: %(name)s"

    def __init__(self, name):
        BzrError.__init__(self)
        self.name = name


class InvalidRevisionNumber(BzrError):

    _fmt = "Invalid revision number %(revno)s"

    def __init__(self, revno):
        BzrError.__init__(self)
        self.revno = revno


class InvalidRevisionId(BzrError):

    _fmt = "Invalid revision-id {%(revision_id)s} in %(branch)s"

    def __init__(self, revision_id, branch):
        # branch can be any string or object with __str__ defined
        BzrError.__init__(self)
        self.revision_id = revision_id
        self.branch = branch


class ReservedId(BzrError):

    _fmt = "Reserved revision-id {%(revision_id)s}"

    def __init__(self, revision_id):
        self.revision_id = revision_id


class RootMissing(InternalBzrError):

    _fmt = ("The root entry of a tree must be the first entry supplied to "
        "record_entry_contents.")


class NoPublicBranch(BzrError):

    _fmt = 'There is no public branch set for "%(branch_url)s".'

    def __init__(self, branch):
        import bzrlib.urlutils as urlutils
        public_location = urlutils.unescape_for_display(branch.base, 'ascii')
        BzrError.__init__(self, branch_url=public_location)


class NoHelpTopic(BzrError):

    _fmt = ("No help could be found for '%(topic)s'. "
        "Please use 'bzr help topics' to obtain a list of topics.")

    def __init__(self, topic):
        self.topic = topic


class NoSuchId(BzrError):

    _fmt = 'The file id "%(file_id)s" is not present in the tree %(tree)s.'

    def __init__(self, tree, file_id):
        BzrError.__init__(self)
        self.file_id = file_id
        self.tree = tree


class NoSuchIdInRepository(NoSuchId):

    _fmt = ('The file id "%(file_id)s" is not present in the repository'
            ' %(repository)r')

    def __init__(self, repository, file_id):
        BzrError.__init__(self, repository=repository, file_id=file_id)


class NotStacked(BranchError):

    _fmt = "The branch '%(branch)s' is not stacked."


class InventoryModified(InternalBzrError):

    _fmt = ("The current inventory for the tree %(tree)r has been modified,"
            " so a clean inventory cannot be read without data loss.")

    def __init__(self, tree):
        self.tree = tree


class NoWorkingTree(BzrError):

    _fmt = 'No WorkingTree exists for "%(base)s".'

    def __init__(self, base):
        BzrError.__init__(self)
        self.base = base


class NotBuilding(BzrError):

    _fmt = "Not currently building a tree."


class NotLocalUrl(BzrError):

    _fmt = "%(url)s is not a local path."

    def __init__(self, url):
        self.url = url


class WorkingTreeAlreadyPopulated(InternalBzrError):

    _fmt = 'Working tree already populated in "%(base)s"'

    def __init__(self, base):
        self.base = base


class BzrCommandError(BzrError):
    """Error from user command"""

    # Error from malformed user command; please avoid raising this as a
    # generic exception not caused by user input.
    #
    # I think it's a waste of effort to differentiate between errors that
    # are not intended to be caught anyway.  UI code need not subclass
    # BzrCommandError, and non-UI code should not throw a subclass of
    # BzrCommandError.  ADHB 20051211


class NotWriteLocked(BzrError):

    _fmt = """%(not_locked)r is not write locked but needs to be."""

    def __init__(self, not_locked):
        self.not_locked = not_locked


class BzrOptionError(BzrCommandError):

    _fmt = "Error in command line options"


class BadIndexFormatSignature(BzrError):

    _fmt = "%(value)s is not an index of type %(_type)s."

    def __init__(self, value, _type):
        BzrError.__init__(self)
        self.value = value
        self._type = _type


class BadIndexData(BzrError):

    _fmt = "Error in data for index %(value)s."

    def __init__(self, value):
        BzrError.__init__(self)
        self.value = value


class BadIndexDuplicateKey(BzrError):

    _fmt = "The key '%(key)s' is already in index '%(index)s'."

    def __init__(self, key, index):
        BzrError.__init__(self)
        self.key = key
        self.index = index


class BadIndexKey(BzrError):

    _fmt = "The key '%(key)s' is not a valid key."

    def __init__(self, key):
        BzrError.__init__(self)
        self.key = key


class BadIndexOptions(BzrError):

    _fmt = "Could not parse options for index %(value)s."

    def __init__(self, value):
        BzrError.__init__(self)
        self.value = value


class BadIndexValue(BzrError):

    _fmt = "The value '%(value)s' is not a valid value."

    def __init__(self, value):
        BzrError.__init__(self)
        self.value = value


class BadOptionValue(BzrError):

    _fmt = """Bad value "%(value)s" for option "%(name)s"."""

    def __init__(self, name, value):
        BzrError.__init__(self, name=name, value=value)


class StrictCommitFailed(BzrError):

    _fmt = "Commit refused because there are unknown files in the tree"


# XXX: Should be unified with TransportError; they seem to represent the
# same thing
# RBC 20060929: I think that unifiying with TransportError would be a mistake
# - this is finer than a TransportError - and more useful as such. It
# differentiates between 'transport has failed' and 'operation on a transport
# has failed.'
class PathError(BzrError):

    _fmt = "Generic path error: %(path)r%(extra)s)"

    def __init__(self, path, extra=None):
        BzrError.__init__(self)
        self.path = path
        if extra:
            self.extra = ': ' + str(extra)
        else:
            self.extra = ''


class NoSuchFile(PathError):

    _fmt = "No such file: %(path)r%(extra)s"


class FileExists(PathError):

    _fmt = "File exists: %(path)r%(extra)s"


class RenameFailedFilesExist(BzrError):
    """Used when renaming and both source and dest exist."""

    _fmt = ("Could not rename %(source)s => %(dest)s because both files exist."
            " (Use --after to tell bzr about a rename that has already"
            " happened)%(extra)s")

    def __init__(self, source, dest, extra=None):
        BzrError.__init__(self)
        self.source = str(source)
        self.dest = str(dest)
        if extra:
            self.extra = ' ' + str(extra)
        else:
            self.extra = ''


class NotADirectory(PathError):

    _fmt = '"%(path)s" is not a directory %(extra)s'


class NotInWorkingDirectory(PathError):

    _fmt = '"%(path)s" is not in the working directory %(extra)s'


class DirectoryNotEmpty(PathError):

    _fmt = 'Directory not empty: "%(path)s"%(extra)s'


class HardLinkNotSupported(PathError):

    _fmt = 'Hard-linking "%(path)s" is not supported'


class ReadingCompleted(InternalBzrError):

    _fmt = ("The MediumRequest '%(request)s' has already had finish_reading "
            "called upon it - the request has been completed and no more "
            "data may be read.")

    def __init__(self, request):
        self.request = request


class ResourceBusy(PathError):

    _fmt = 'Device or resource busy: "%(path)s"%(extra)s'


class PermissionDenied(PathError):

    _fmt = 'Permission denied: "%(path)s"%(extra)s'


class InvalidURL(PathError):

    _fmt = 'Invalid url supplied to transport: "%(path)s"%(extra)s'


class InvalidURLJoin(PathError):

    _fmt = "Invalid URL join request: %(reason)s: %(base)r + %(join_args)r"

    def __init__(self, reason, base, join_args):
        self.reason = reason
        self.base = base
        self.join_args = join_args
        PathError.__init__(self, base, reason)


class InvalidRebaseURLs(PathError):

    _fmt = "URLs differ by more than path: %(from_)r and %(to)r"

    def __init__(self, from_, to):
        self.from_ = from_
        self.to = to
        PathError.__init__(self, from_, 'URLs differ by more than path.')


class UnavailableRepresentation(InternalBzrError):

    _fmt = ("The encoding '%(wanted)s' is not available for key %(key)s which "
        "is encoded as '%(native)s'.")

    def __init__(self, key, wanted, native):
        InternalBzrError.__init__(self)
        self.wanted = wanted
        self.native = native
        self.key = key


class UnknownHook(BzrError):

    _fmt = "The %(type)s hook '%(hook)s' is unknown in this version of bzrlib."

    def __init__(self, hook_type, hook_name):
        BzrError.__init__(self)
        self.type = hook_type
        self.hook = hook_name


class UnsupportedProtocol(PathError):

    _fmt = 'Unsupported protocol for url "%(path)s"%(extra)s'

    def __init__(self, url, extra):
        PathError.__init__(self, url, extra=extra)


class UnstackableBranchFormat(BzrError):

    _fmt = ("The branch '%(url)s'(%(format)s) is not a stackable format. "
        "You will need to upgrade the branch to permit branch stacking.")

    def __init__(self, format, url):
        BzrError.__init__(self)
        self.format = format
        self.url = url


class UnstackableRepositoryFormat(BzrError):

    _fmt = ("The repository '%(url)s'(%(format)s) is not a stackable format. "
        "You will need to upgrade the repository to permit branch stacking.")

    def __init__(self, format, url):
        BzrError.__init__(self)
        self.format = format
        self.url = url


class ReadError(PathError):

    _fmt = """Error reading from %(path)r."""


class ShortReadvError(PathError):

    _fmt = ('readv() read %(actual)s bytes rather than %(length)s bytes'
            ' at %(offset)s for "%(path)s"%(extra)s')

    internal_error = True

    def __init__(self, path, offset, length, actual, extra=None):
        PathError.__init__(self, path, extra=extra)
        self.offset = offset
        self.length = length
        self.actual = actual


class PathNotChild(PathError):

    _fmt = 'Path "%(path)s" is not a child of path "%(base)s"%(extra)s'

    internal_error = True

    def __init__(self, path, base, extra=None):
        BzrError.__init__(self)
        self.path = path
        self.base = base
        if extra:
            self.extra = ': ' + str(extra)
        else:
            self.extra = ''


class InvalidNormalization(PathError):

    _fmt = 'Path "%(path)s" is not unicode normalized'


# TODO: This is given a URL; we try to unescape it but doing that from inside
# the exception object is a bit undesirable.
# TODO: Probably this behavior of should be a common superclass
class NotBranchError(PathError):

    _fmt = 'Not a branch: "%(path)s".'

    def __init__(self, path):
       import bzrlib.urlutils as urlutils
       self.path = urlutils.unescape_for_display(path, 'ascii')


class NoSubmitBranch(PathError):

    _fmt = 'No submit branch available for branch "%(path)s"'

    def __init__(self, branch):
       import bzrlib.urlutils as urlutils
       self.path = urlutils.unescape_for_display(branch.base, 'ascii')


class AlreadyBranchError(PathError):

    _fmt = 'Already a branch: "%(path)s".'


class BranchExistsWithoutWorkingTree(PathError):

    _fmt = 'Directory contains a branch, but no working tree \
(use bzr checkout if you wish to build a working tree): "%(path)s"'


class AtomicFileAlreadyClosed(PathError):

    _fmt = ('"%(function)s" called on an AtomicFile after it was closed:'
            ' "%(path)s"')

    def __init__(self, path, function):
        PathError.__init__(self, path=path, extra=None)
        self.function = function


class InaccessibleParent(PathError):

    _fmt = ('Parent not accessible given base "%(base)s" and'
            ' relative path "%(path)s"')

    def __init__(self, path, base):
        PathError.__init__(self, path)
        self.base = base


class NoRepositoryPresent(BzrError):

    _fmt = 'No repository present: "%(path)s"'
    def __init__(self, bzrdir):
        BzrError.__init__(self)
        self.path = bzrdir.transport.clone('..').base


class FileInWrongBranch(BzrError):

    _fmt = 'File "%(path)s" is not in branch %(branch_base)s.'

    def __init__(self, branch, path):
        BzrError.__init__(self)
        self.branch = branch
        self.branch_base = branch.base
        self.path = path


class UnsupportedFormatError(BzrError):

    _fmt = "Unsupported branch format: %(format)s\nPlease run 'bzr upgrade'"


class UnknownFormatError(BzrError):

    _fmt = "Unknown %(kind)s format: %(format)r"

    def __init__(self, format, kind='branch'):
        self.kind = kind
        self.format = format


class IncompatibleFormat(BzrError):

    _fmt = "Format %(format)s is not compatible with .bzr version %(bzrdir)s."

    def __init__(self, format, bzrdir_format):
        BzrError.__init__(self)
        self.format = format
        self.bzrdir = bzrdir_format


class IncompatibleRepositories(BzrError):

    _fmt = "%(target)s\n" \
            "is not compatible with\n" \
            "%(source)s\n" \
            "%(details)s"

    def __init__(self, source, target, details=None):
        if details is None:
            details = "(no details)"
        BzrError.__init__(self, target=target, source=source, details=details)


class IncompatibleRevision(BzrError):

    _fmt = "Revision is not compatible with %(repo_format)s"

    def __init__(self, repo_format):
        BzrError.__init__(self)
        self.repo_format = repo_format


class AlreadyVersionedError(BzrError):
    """Used when a path is expected not to be versioned, but it is."""

    _fmt = "%(context_info)s%(path)s is already versioned."

    def __init__(self, path, context_info=None):
        """Construct a new AlreadyVersionedError.

        :param path: This is the path which is versioned,
        which should be in a user friendly form.
        :param context_info: If given, this is information about the context,
        which could explain why this is expected to not be versioned.
        """
        BzrError.__init__(self)
        self.path = path
        if context_info is None:
            self.context_info = ''
        else:
            self.context_info = context_info + ". "


class NotVersionedError(BzrError):
    """Used when a path is expected to be versioned, but it is not."""

    _fmt = "%(context_info)s%(path)s is not versioned."

    def __init__(self, path, context_info=None):
        """Construct a new NotVersionedError.

        :param path: This is the path which is not versioned,
        which should be in a user friendly form.
        :param context_info: If given, this is information about the context,
        which could explain why this is expected to be versioned.
        """
        BzrError.__init__(self)
        self.path = path
        if context_info is None:
            self.context_info = ''
        else:
            self.context_info = context_info + ". "


class PathsNotVersionedError(BzrError):
    """Used when reporting several paths which are not versioned"""

    _fmt = "Path(s) are not versioned: %(paths_as_string)s"

    def __init__(self, paths):
        from bzrlib.osutils import quotefn
        BzrError.__init__(self)
        self.paths = paths
        self.paths_as_string = ' '.join([quotefn(p) for p in paths])


class PathsDoNotExist(BzrError):

    _fmt = "Path(s) do not exist: %(paths_as_string)s%(extra)s"

    # used when reporting that paths are neither versioned nor in the working
    # tree

    def __init__(self, paths, extra=None):
        # circular import
        from bzrlib.osutils import quotefn
        BzrError.__init__(self)
        self.paths = paths
        self.paths_as_string = ' '.join([quotefn(p) for p in paths])
        if extra:
            self.extra = ': ' + str(extra)
        else:
            self.extra = ''


class BadFileKindError(BzrError):

    _fmt = 'Cannot operate on "%(filename)s" of unsupported kind "%(kind)s"'

    def __init__(self, filename, kind):
        BzrError.__init__(self, filename=filename, kind=kind)


class BadFilenameEncoding(BzrError):

    _fmt = ('Filename %(filename)r is not valid in your current filesystem'
            ' encoding %(fs_encoding)s')

    def __init__(self, filename, fs_encoding):
        BzrError.__init__(self)
        self.filename = filename
        self.fs_encoding = fs_encoding


class ForbiddenControlFileError(BzrError):

    _fmt = 'Cannot operate on "%(filename)s" because it is a control file'


class LockError(InternalBzrError):

    _fmt = "Lock error: %(msg)s"

    # All exceptions from the lock/unlock functions should be from
    # this exception class.  They will be translated as necessary. The
    # original exception is available as e.original_error
    #
    # New code should prefer to raise specific subclasses
    def __init__(self, message):
        # Python 2.5 uses a slot for StandardError.message,
        # so use a different variable name.  We now work around this in
        # BzrError.__str__, but this member name is kept for compatability.
        self.msg = message


class LockActive(LockError):

    _fmt = "The lock for '%(lock_description)s' is in use and cannot be broken."

    internal_error = False

    def __init__(self, lock_description):
        self.lock_description = lock_description


class CommitNotPossible(LockError):

    _fmt = "A commit was attempted but we do not have a write lock open."

    def __init__(self):
        pass


class AlreadyCommitted(LockError):

    _fmt = "A rollback was requested, but is not able to be accomplished."

    def __init__(self):
        pass


class ReadOnlyError(LockError):

    _fmt = "A write attempt was made in a read only transaction on %(obj)s"

    # TODO: There should also be an error indicating that you need a write
    # lock and don't have any lock at all... mbp 20070226

    def __init__(self, obj):
        self.obj = obj


class LockFailed(LockError):

    internal_error = False

    _fmt = "Cannot lock %(lock)s: %(why)s"

    def __init__(self, lock, why):
        LockError.__init__(self, '')
        self.lock = lock
        self.why = why


class OutSideTransaction(BzrError):

    _fmt = ("A transaction related operation was attempted after"
            " the transaction finished.")


class ObjectNotLocked(LockError):

    _fmt = "%(obj)r is not locked"

    # this can indicate that any particular object is not locked; see also
    # LockNotHeld which means that a particular *lock* object is not held by
    # the caller -- perhaps they should be unified.
    def __init__(self, obj):
        self.obj = obj


class ReadOnlyObjectDirtiedError(ReadOnlyError):

    _fmt = "Cannot change object %(obj)r in read only transaction"

    def __init__(self, obj):
        self.obj = obj


class UnlockableTransport(LockError):

    internal_error = False

    _fmt = "Cannot lock: transport is read only: %(transport)s"

    def __init__(self, transport):
        self.transport = transport


class LockContention(LockError):

    _fmt = 'Could not acquire lock "%(lock)s"'
    # TODO: show full url for lock, combining the transport and relative
    # bits?

    internal_error = False

    def __init__(self, lock):
        self.lock = lock


class LockBroken(LockError):

    _fmt = ("Lock was broken while still open: %(lock)s"
            " - check storage consistency!")

    internal_error = False

    def __init__(self, lock):
        self.lock = lock


class LockBreakMismatch(LockError):

    _fmt = ("Lock was released and re-acquired before being broken:"
            " %(lock)s: held by %(holder)r, wanted to break %(target)r")

    internal_error = False

    def __init__(self, lock, holder, target):
        self.lock = lock
        self.holder = holder
        self.target = target


class LockNotHeld(LockError):

    _fmt = "Lock not held: %(lock)s"

    internal_error = False

    def __init__(self, lock):
        self.lock = lock


class TokenLockingNotSupported(LockError):

    _fmt = "The object %(obj)s does not support token specifying a token when locking."

    def __init__(self, obj):
        self.obj = obj


class TokenMismatch(LockBroken):

    _fmt = "The lock token %(given_token)r does not match lock token %(lock_token)r."

    internal_error = True

    def __init__(self, given_token, lock_token):
        self.given_token = given_token
        self.lock_token = lock_token


class PointlessCommit(BzrError):

    _fmt = "No changes to commit"


class CannotCommitSelectedFileMerge(BzrError):

    _fmt = 'Selected-file commit of merges is not supported yet:'\
        ' files %(files_str)s'

    def __init__(self, files):
        files_str = ', '.join(files)
        BzrError.__init__(self, files=files, files_str=files_str)


class BadCommitMessageEncoding(BzrError):

    _fmt = 'The specified commit message contains characters unsupported by '\
        'the current encoding.'


class UpgradeReadonly(BzrError):

    _fmt = "Upgrade URL cannot work with readonly URLs."


class UpToDateFormat(BzrError):

    _fmt = "The branch format %(format)s is already at the most recent format."

    def __init__(self, format):
        BzrError.__init__(self)
        self.format = format


class StrictCommitFailed(Exception):

    _fmt = "Commit refused because there are unknowns in the tree."


class NoSuchRevision(InternalBzrError):

    _fmt = "%(branch)s has no revision %(revision)s"

    def __init__(self, branch, revision):
        # 'branch' may sometimes be an internal object like a KnitRevisionStore
        BzrError.__init__(self, branch=branch, revision=revision)


class RangeInChangeOption(BzrError):

    _fmt = "Option --change does not accept revision ranges"


class NoSuchRevisionSpec(BzrError):

    _fmt = "No namespace registered for string: %(spec)r"

    def __init__(self, spec):
        BzrError.__init__(self, spec=spec)


class NoSuchRevisionInTree(NoSuchRevision):
    """When using Tree.revision_tree, and the revision is not accessible."""

    _fmt = "The revision id {%(revision_id)s} is not present in the tree %(tree)s."

    def __init__(self, tree, revision_id):
        BzrError.__init__(self)
        self.tree = tree
        self.revision_id = revision_id


class InvalidRevisionSpec(BzrError):

    _fmt = ("Requested revision: %(spec)r does not exist in branch:"
            " %(branch)s%(extra)s")

    def __init__(self, spec, branch, extra=None):
        BzrError.__init__(self, branch=branch, spec=spec)
        if extra:
            self.extra = '\n' + str(extra)
        else:
            self.extra = ''


class HistoryMissing(BzrError):

    _fmt = "%(branch)s is missing %(object_type)s {%(object_id)s}"


class AppendRevisionsOnlyViolation(BzrError):

    _fmt = ('Operation denied because it would change the main history,'
           ' which is not permitted by the append_revisions_only setting on'
           ' branch "%(location)s".')

    def __init__(self, location):
       import bzrlib.urlutils as urlutils
       location = urlutils.unescape_for_display(location, 'ascii')
       BzrError.__init__(self, location=location)


class DivergedBranches(BzrError):

    _fmt = ("These branches have diverged."
            " Use the merge command to reconcile them.")

    def __init__(self, branch1, branch2):
        self.branch1 = branch1
        self.branch2 = branch2


class NotLefthandHistory(InternalBzrError):

    _fmt = "Supplied history does not follow left-hand parents"

    def __init__(self, history):
        BzrError.__init__(self, history=history)


class UnrelatedBranches(BzrError):

    _fmt = ("Branches have no common ancestor, and"
            " no merge base revision was specified.")


class CannotReverseCherrypick(BzrError):

    _fmt = ('Selected merge cannot perform reverse cherrypicks.  Try merge3'
            ' or diff3.')


class NoCommonAncestor(BzrError):

    _fmt = "Revisions have no common ancestor: %(revision_a)s %(revision_b)s"

    def __init__(self, revision_a, revision_b):
        self.revision_a = revision_a
        self.revision_b = revision_b


class NoCommonRoot(BzrError):

    _fmt = ("Revisions are not derived from the same root: "
           "%(revision_a)s %(revision_b)s.")

    def __init__(self, revision_a, revision_b):
        BzrError.__init__(self, revision_a=revision_a, revision_b=revision_b)


class NotAncestor(BzrError):

    _fmt = "Revision %(rev_id)s is not an ancestor of %(not_ancestor_id)s"

    def __init__(self, rev_id, not_ancestor_id):
        BzrError.__init__(self, rev_id=rev_id,
            not_ancestor_id=not_ancestor_id)


class InstallFailed(BzrError):

    def __init__(self, revisions):
        revision_str = ", ".join(str(r) for r in revisions)
        msg = "Could not install revisions:\n%s" % revision_str
        BzrError.__init__(self, msg)
        self.revisions = revisions


class AmbiguousBase(BzrError):

    def __init__(self, bases):
        warn("BzrError AmbiguousBase has been deprecated as of bzrlib 0.8.",
                DeprecationWarning)
        msg = ("The correct base is unclear, because %s are all equally close"
                % ", ".join(bases))
        BzrError.__init__(self, msg)
        self.bases = bases


class NoCommits(BranchError):

    _fmt = "Branch %(branch)s has no commits."


class UnlistableStore(BzrError):

    def __init__(self, store):
        BzrError.__init__(self, "Store %s is not listable" % store)



class UnlistableBranch(BzrError):

    def __init__(self, br):
        BzrError.__init__(self, "Stores for branch %s are not listable" % br)


class BoundBranchOutOfDate(BzrError):

    _fmt = ("Bound branch %(branch)s is out of date with master branch"
            " %(master)s.")

    def __init__(self, branch, master):
        BzrError.__init__(self)
        self.branch = branch
        self.master = master


class CommitToDoubleBoundBranch(BzrError):

    _fmt = ("Cannot commit to branch %(branch)s."
            " It is bound to %(master)s, which is bound to %(remote)s.")

    def __init__(self, branch, master, remote):
        BzrError.__init__(self)
        self.branch = branch
        self.master = master
        self.remote = remote


class OverwriteBoundBranch(BzrError):

    _fmt = "Cannot pull --overwrite to a branch which is bound %(branch)s"

    def __init__(self, branch):
        BzrError.__init__(self)
        self.branch = branch


class BoundBranchConnectionFailure(BzrError):

    _fmt = ("Unable to connect to target of bound branch %(branch)s"
            " => %(target)s: %(error)s")

    def __init__(self, branch, target, error):
        BzrError.__init__(self)
        self.branch = branch
        self.target = target
        self.error = error


class WeaveError(BzrError):

    _fmt = "Error in processing weave: %(msg)s"

    def __init__(self, msg=None):
        BzrError.__init__(self)
        self.msg = msg


class WeaveRevisionAlreadyPresent(WeaveError):

    _fmt = "Revision {%(revision_id)s} already present in %(weave)s"

    def __init__(self, revision_id, weave):

        WeaveError.__init__(self)
        self.revision_id = revision_id
        self.weave = weave


class WeaveRevisionNotPresent(WeaveError):

    _fmt = "Revision {%(revision_id)s} not present in %(weave)s"

    def __init__(self, revision_id, weave):
        WeaveError.__init__(self)
        self.revision_id = revision_id
        self.weave = weave


class WeaveFormatError(WeaveError):

    _fmt = "Weave invariant violated: %(what)s"

    def __init__(self, what):
        WeaveError.__init__(self)
        self.what = what


class WeaveParentMismatch(WeaveError):

    _fmt = "Parents are mismatched between two revisions. %(message)s"


class WeaveInvalidChecksum(WeaveError):

    _fmt = "Text did not match it's checksum: %(message)s"


class WeaveTextDiffers(WeaveError):

    _fmt = ("Weaves differ on text content. Revision:"
            " {%(revision_id)s}, %(weave_a)s, %(weave_b)s")

    def __init__(self, revision_id, weave_a, weave_b):
        WeaveError.__init__(self)
        self.revision_id = revision_id
        self.weave_a = weave_a
        self.weave_b = weave_b


class WeaveTextDiffers(WeaveError):

    _fmt = ("Weaves differ on text content. Revision:"
            " {%(revision_id)s}, %(weave_a)s, %(weave_b)s")

    def __init__(self, revision_id, weave_a, weave_b):
        WeaveError.__init__(self)
        self.revision_id = revision_id
        self.weave_a = weave_a
        self.weave_b = weave_b


class VersionedFileError(BzrError):

    _fmt = "Versioned file error"


class RevisionNotPresent(VersionedFileError):

    _fmt = 'Revision {%(revision_id)s} not present in "%(file_id)s".'

    def __init__(self, revision_id, file_id):
        VersionedFileError.__init__(self)
        self.revision_id = revision_id
        self.file_id = file_id


class RevisionAlreadyPresent(VersionedFileError):

    _fmt = 'Revision {%(revision_id)s} already present in "%(file_id)s".'

    def __init__(self, revision_id, file_id):
        VersionedFileError.__init__(self)
        self.revision_id = revision_id
        self.file_id = file_id


class VersionedFileInvalidChecksum(VersionedFileError):

    _fmt = "Text did not match its checksum: %(message)s"


class KnitError(InternalBzrError):

    _fmt = "Knit error"


class KnitCorrupt(KnitError):

    _fmt = "Knit %(filename)s corrupt: %(how)s"

    def __init__(self, filename, how):
        KnitError.__init__(self)
        self.filename = filename
        self.how = how


class SHA1KnitCorrupt(KnitCorrupt):

    _fmt = ("Knit %(filename)s corrupt: sha-1 of reconstructed text does not "
        "match expected sha-1. key %(key)s expected sha %(expected)s actual "
        "sha %(actual)s")

    def __init__(self, filename, actual, expected, key, content):
        KnitError.__init__(self)
        self.filename = filename
        self.actual = actual
        self.expected = expected
        self.key = key
        self.content = content


class KnitDataStreamIncompatible(KnitError):
    # Not raised anymore, as we can convert data streams.  In future we may
    # need it again for more exotic cases, so we're keeping it around for now.

    _fmt = "Cannot insert knit data stream of format \"%(stream_format)s\" into knit of format \"%(target_format)s\"."

    def __init__(self, stream_format, target_format):
        self.stream_format = stream_format
        self.target_format = target_format


class KnitDataStreamUnknown(KnitError):
    # Indicates a data stream we don't know how to handle.

    _fmt = "Cannot parse knit data stream of format \"%(stream_format)s\"."

    def __init__(self, stream_format):
        self.stream_format = stream_format


class KnitHeaderError(KnitError):

    _fmt = 'Knit header error: %(badline)r unexpected for file "%(filename)s".'

    def __init__(self, badline, filename):
        KnitError.__init__(self)
        self.badline = badline
        self.filename = filename

class KnitIndexUnknownMethod(KnitError):
    """Raised when we don't understand the storage method.

    Currently only 'fulltext' and 'line-delta' are supported.
    """

    _fmt = ("Knit index %(filename)s does not have a known method"
            " in options: %(options)r")

    def __init__(self, filename, options):
        KnitError.__init__(self)
        self.filename = filename
        self.options = options


class RetryWithNewPacks(BzrError):
    """Raised when we realize that the packs on disk have changed.

    This is meant as more of a signaling exception, to trap between where a
    local error occurred and the code that can actually handle the error and
    code that can retry appropriately.
    """

    internal_error = True

    _fmt = ("Pack files have changed, reload and retry. context: %(context)s"
            " %(orig_error)s")

    def __init__(self, context, reload_occurred, exc_info):
        """create a new RetryWithNewPacks error.

        :param reload_occurred: Set to True if we know that the packs have
            already been reloaded, and we are failing because of an in-memory
            cache miss. If set to True then we will ignore if a reload says
            nothing has changed, because we assume it has already reloaded. If
            False, then a reload with nothing changed will force an error.
        :param exc_info: The original exception traceback, so if there is a
            problem we can raise the original error (value from sys.exc_info())
        """
        BzrError.__init__(self)
        self.reload_occurred = reload_occurred
        self.exc_info = exc_info
        self.orig_error = exc_info[1]
        # TODO: The global error handler should probably treat this by
        #       raising/printing the original exception with a bit about
        #       RetryWithNewPacks also not being caught


class RetryAutopack(RetryWithNewPacks):
    """Raised when we are autopacking and we find a missing file.

    Meant as a signaling exception, to tell the autopack code it should try
    again.
    """

    internal_error = True

    _fmt = ("Pack files have changed, reload and try autopack again."
            " context: %(context)s %(orig_error)s")


class NoSuchExportFormat(BzrError):

    _fmt = "Export format %(format)r not supported"

    def __init__(self, format):
        BzrError.__init__(self)
        self.format = format


class TransportError(BzrError):

    _fmt = "Transport error: %(msg)s %(orig_error)s"

    def __init__(self, msg=None, orig_error=None):
        if msg is None and orig_error is not None:
            msg = str(orig_error)
        if orig_error is None:
            orig_error = ''
        if msg is None:
            msg =  ''
        self.msg = msg
        self.orig_error = orig_error
        BzrError.__init__(self)


class TooManyConcurrentRequests(InternalBzrError):

    _fmt = ("The medium '%(medium)s' has reached its concurrent request limit."
            " Be sure to finish_writing and finish_reading on the"
            " currently open request.")

    def __init__(self, medium):
        self.medium = medium


class SmartProtocolError(TransportError):

    _fmt = "Generic bzr smart protocol error: %(details)s"

    def __init__(self, details):
        self.details = details


class UnexpectedProtocolVersionMarker(TransportError):

    _fmt = "Received bad protocol version marker: %(marker)r"

    def __init__(self, marker):
        self.marker = marker


class UnknownSmartMethod(InternalBzrError):

    _fmt = "The server does not recognise the '%(verb)s' request."

    def __init__(self, verb):
        self.verb = verb


class SmartMessageHandlerError(InternalBzrError):

    _fmt = ("The message handler raised an exception:\n"
            "%(traceback_text)s")

    def __init__(self, exc_info):
        import traceback
        self.exc_type, self.exc_value, self.exc_tb = exc_info
        self.exc_info = exc_info
        traceback_strings = traceback.format_exception(
                self.exc_type, self.exc_value, self.exc_tb)
        self.traceback_text = ''.join(traceback_strings)


# A set of semi-meaningful errors which can be thrown
class TransportNotPossible(TransportError):

    _fmt = "Transport operation not possible: %(msg)s %(orig_error)s"


class ConnectionError(TransportError):

    _fmt = "Connection error: %(msg)s %(orig_error)s"


class SocketConnectionError(ConnectionError):

    _fmt = "%(msg)s %(host)s%(port)s%(orig_error)s"

    def __init__(self, host, port=None, msg=None, orig_error=None):
        if msg is None:
            msg = 'Failed to connect to'
        if orig_error is None:
            orig_error = ''
        else:
            orig_error = '; ' + str(orig_error)
        ConnectionError.__init__(self, msg=msg, orig_error=orig_error)
        self.host = host
        if port is None:
            self.port = ''
        else:
            self.port = ':%s' % port


# XXX: This is also used for unexpected end of file, which is different at the
# TCP level from "connection reset".
class ConnectionReset(TransportError):

    _fmt = "Connection closed: %(msg)s %(orig_error)s"


class InvalidRange(TransportError):

    _fmt = "Invalid range access in %(path)s at %(offset)s: %(msg)s"

    def __init__(self, path, offset, msg=None):
        TransportError.__init__(self, msg)
        self.path = path
        self.offset = offset


class InvalidHttpResponse(TransportError):

    _fmt = "Invalid http response for %(path)s: %(msg)s"

    def __init__(self, path, msg, orig_error=None):
        self.path = path
        TransportError.__init__(self, msg, orig_error=orig_error)


class InvalidHttpRange(InvalidHttpResponse):

    _fmt = "Invalid http range %(range)r for %(path)s: %(msg)s"

    def __init__(self, path, range, msg):
        self.range = range
        InvalidHttpResponse.__init__(self, path, msg)


class InvalidHttpContentType(InvalidHttpResponse):

    _fmt = 'Invalid http Content-type "%(ctype)s" for %(path)s: %(msg)s'

    def __init__(self, path, ctype, msg):
        self.ctype = ctype
        InvalidHttpResponse.__init__(self, path, msg)


class RedirectRequested(TransportError):

    _fmt = '%(source)s is%(permanently)s redirected to %(target)s'

    def __init__(self, source, target, is_permanent=False):
        self.source = source
        self.target = target
        if is_permanent:
            self.permanently = ' permanently'
        else:
            self.permanently = ''
        TransportError.__init__(self)


class TooManyRedirections(TransportError):

    _fmt = "Too many redirections"


class ConflictsInTree(BzrError):

    _fmt = "Working tree has conflicts."


class ParseConfigError(BzrError):

    def __init__(self, errors, filename):
        if filename is None:
            filename = ""
        message = "Error(s) parsing config file %s:\n%s" % \
            (filename, ('\n'.join(e.msg for e in errors)))
        BzrError.__init__(self, message)


class NoEmailInUsername(BzrError):

    _fmt = "%(username)r does not seem to contain a reasonable email address"

    def __init__(self, username):
        BzrError.__init__(self)
        self.username = username


class SigningFailed(BzrError):

    _fmt = 'Failed to gpg sign data with command "%(command_line)s"'

    def __init__(self, command_line):
        BzrError.__init__(self, command_line=command_line)


class WorkingTreeNotRevision(BzrError):

    _fmt = ("The working tree for %(basedir)s has changed since"
            " the last commit, but weave merge requires that it be"
            " unchanged")

    def __init__(self, tree):
        BzrError.__init__(self, basedir=tree.basedir)


class CantReprocessAndShowBase(BzrError):

    _fmt = ("Can't reprocess and show base, because reprocessing obscures "
           "the relationship of conflicting lines to the base")


class GraphCycleError(BzrError):

    _fmt = "Cycle in graph %(graph)r"

    def __init__(self, graph):
        BzrError.__init__(self)
        self.graph = graph


class WritingCompleted(InternalBzrError):

    _fmt = ("The MediumRequest '%(request)s' has already had finish_writing "
            "called upon it - accept bytes may not be called anymore.")

    def __init__(self, request):
        self.request = request


class WritingNotComplete(InternalBzrError):

    _fmt = ("The MediumRequest '%(request)s' has not has finish_writing "
            "called upon it - until the write phase is complete no "
            "data may be read.")

    def __init__(self, request):
        self.request = request


class NotConflicted(BzrError):

    _fmt = "File %(filename)s is not conflicted."

    def __init__(self, filename):
        BzrError.__init__(self)
        self.filename = filename


class MediumNotConnected(InternalBzrError):

    _fmt = """The medium '%(medium)s' is not connected."""

    def __init__(self, medium):
        self.medium = medium


class MustUseDecorated(Exception):

    _fmt = "A decorating function has requested its original command be used."


class NoBundleFound(BzrError):

    _fmt = 'No bundle was found in "%(filename)s".'

    def __init__(self, filename):
        BzrError.__init__(self)
        self.filename = filename


class BundleNotSupported(BzrError):

    _fmt = "Unable to handle bundle version %(version)s: %(msg)s"

    def __init__(self, version, msg):
        BzrError.__init__(self)
        self.version = version
        self.msg = msg


class MissingText(BzrError):

    _fmt = ("Branch %(base)s is missing revision"
            " %(text_revision)s of %(file_id)s")

    def __init__(self, branch, text_revision, file_id):
        BzrError.__init__(self)
        self.branch = branch
        self.base = branch.base
        self.text_revision = text_revision
        self.file_id = file_id


class DuplicateFileId(BzrError):

    _fmt = "File id {%(file_id)s} already exists in inventory as %(entry)s"

    def __init__(self, file_id, entry):
        BzrError.__init__(self)
        self.file_id = file_id
        self.entry = entry


class DuplicateKey(BzrError):

    _fmt = "Key %(key)s is already present in map"


class DuplicateHelpPrefix(BzrError):

    _fmt = "The prefix %(prefix)s is in the help search path twice."

    def __init__(self, prefix):
        self.prefix = prefix


class MalformedTransform(BzrError):

    _fmt = "Tree transform is malformed %(conflicts)r"


class NoFinalPath(BzrError):

    _fmt = ("No final name for trans_id %(trans_id)r\n"
            "file-id: %(file_id)r\n"
            "root trans-id: %(root_trans_id)r\n")

    def __init__(self, trans_id, transform):
        self.trans_id = trans_id
        self.file_id = transform.final_file_id(trans_id)
        self.root_trans_id = transform.root


class BzrBadParameter(InternalBzrError):

    _fmt = "Bad parameter: %(param)r"

    # This exception should never be thrown, but it is a base class for all
    # parameter-to-function errors.

    def __init__(self, param):
        BzrError.__init__(self)
        self.param = param


class BzrBadParameterNotUnicode(BzrBadParameter):

    _fmt = "Parameter %(param)s is neither unicode nor utf8."


class ReusingTransform(BzrError):

    _fmt = "Attempt to reuse a transform that has already been applied."


class CantMoveRoot(BzrError):

    _fmt = "Moving the root directory is not supported at this time"


class BzrMoveFailedError(BzrError):

    _fmt = "Could not move %(from_path)s%(operator)s %(to_path)s%(extra)s"

    def __init__(self, from_path='', to_path='', extra=None):
        from bzrlib.osutils import splitpath
        BzrError.__init__(self)
        if extra:
            self.extra = ': ' + str(extra)
        else:
            self.extra = ''

        has_from = len(from_path) > 0
        has_to = len(to_path) > 0
        if has_from:
            self.from_path = splitpath(from_path)[-1]
        else:
            self.from_path = ''

        if has_to:
            self.to_path = splitpath(to_path)[-1]
        else:
            self.to_path = ''

        self.operator = ""
        if has_from and has_to:
            self.operator = " =>"
        elif has_from:
            self.from_path = "from " + from_path
        elif has_to:
            self.operator = "to"
        else:
            self.operator = "file"


class BzrRenameFailedError(BzrMoveFailedError):

    _fmt = "Could not rename %(from_path)s%(operator)s %(to_path)s%(extra)s"

    def __init__(self, from_path, to_path, extra=None):
        BzrMoveFailedError.__init__(self, from_path, to_path, extra)

class BzrRemoveChangedFilesError(BzrError):
    """Used when user is trying to remove changed files."""

    _fmt = ("Can't safely remove modified or unknown files:\n"
        "%(changes_as_text)s"
        "Use --keep to not delete them, or --force to delete them regardless.")

    def __init__(self, tree_delta):
        BzrError.__init__(self)
        self.changes_as_text = tree_delta.get_changes_as_text()
        #self.paths_as_string = '\n'.join(changed_files)
        #self.paths_as_string = '\n'.join([quotefn(p) for p in changed_files])


class BzrBadParameterNotString(BzrBadParameter):

    _fmt = "Parameter %(param)s is not a string or unicode string."


class BzrBadParameterMissing(BzrBadParameter):

    _fmt = "Parameter $(param)s is required but not present."


class BzrBadParameterUnicode(BzrBadParameter):

    _fmt = ("Parameter %(param)s is unicode but"
            " only byte-strings are permitted.")


class BzrBadParameterContainsNewline(BzrBadParameter):

    _fmt = "Parameter %(param)s contains a newline."


class DependencyNotPresent(BzrError):

    _fmt = 'Unable to import library "%(library)s": %(error)s'

    def __init__(self, library, error):
        BzrError.__init__(self, library=library, error=error)


class ParamikoNotPresent(DependencyNotPresent):

    _fmt = "Unable to import paramiko (required for sftp support): %(error)s"

    def __init__(self, error):
        DependencyNotPresent.__init__(self, 'paramiko', error)


class PointlessMerge(BzrError):

    _fmt = "Nothing to merge."


class UninitializableFormat(BzrError):

    _fmt = "Format %(format)s cannot be initialised by this version of bzr."

    def __init__(self, format):
        BzrError.__init__(self)
        self.format = format


class BadConversionTarget(BzrError):

    _fmt = "Cannot convert to format %(format)s.  %(problem)s"

    def __init__(self, problem, format):
        BzrError.__init__(self)
        self.problem = problem
        self.format = format


class NoDiffFound(BzrError):

    _fmt = 'Could not find an appropriate Differ for file "%(path)s"'

    def __init__(self, path):
        BzrError.__init__(self, path)


class ExecutableMissing(BzrError):

    _fmt = "%(exe_name)s could not be found on this machine"

    def __init__(self, exe_name):
        BzrError.__init__(self, exe_name=exe_name)


class NoDiff(BzrError):

    _fmt = "Diff is not installed on this machine: %(msg)s"

    def __init__(self, msg):
        BzrError.__init__(self, msg=msg)


class NoDiff3(BzrError):

    _fmt = "Diff3 is not installed on this machine."


class ExistingContent(BzrError):
    # Added in bzrlib 0.92, used by VersionedFile.add_lines.

    _fmt = "The content being inserted is already present."


class ExistingLimbo(BzrError):

    _fmt = """This tree contains left-over files from a failed operation.
    Please examine %(limbo_dir)s to see if it contains any files you wish to
    keep, and delete it when you are done."""

    def __init__(self, limbo_dir):
       BzrError.__init__(self)
       self.limbo_dir = limbo_dir


class ExistingPendingDeletion(BzrError):

    _fmt = """This tree contains left-over files from a failed operation.
    Please examine %(pending_deletion)s to see if it contains any files you
    wish to keep, and delete it when you are done."""

    def __init__(self, pending_deletion):
       BzrError.__init__(self, pending_deletion=pending_deletion)


class ImmortalLimbo(BzrError):

    _fmt = """Unable to delete transform temporary directory %(limbo_dir)s.
    Please examine %(limbo_dir)s to see if it contains any files you wish to
    keep, and delete it when you are done."""

    def __init__(self, limbo_dir):
       BzrError.__init__(self)
       self.limbo_dir = limbo_dir


class ImmortalPendingDeletion(BzrError):

    _fmt = ("Unable to delete transform temporary directory "
    "%(pending_deletion)s.  Please examine %(pending_deletion)s to see if it "
    "contains any files you wish to keep, and delete it when you are done.")

    def __init__(self, pending_deletion):
       BzrError.__init__(self, pending_deletion=pending_deletion)


class OutOfDateTree(BzrError):

    _fmt = "Working tree is out of date, please run 'bzr update'."

    def __init__(self, tree):
        BzrError.__init__(self)
        self.tree = tree


class PublicBranchOutOfDate(BzrError):

    _fmt = 'Public branch "%(public_location)s" lacks revision '\
        '"%(revstring)s".'

    def __init__(self, public_location, revstring):
        import bzrlib.urlutils as urlutils
        public_location = urlutils.unescape_for_display(public_location,
                                                        'ascii')
        BzrError.__init__(self, public_location=public_location,
                          revstring=revstring)


class MergeModifiedFormatError(BzrError):

    _fmt = "Error in merge modified format"


class ConflictFormatError(BzrError):

    _fmt = "Format error in conflict listings"


class CorruptDirstate(BzrError):

    _fmt = ("Inconsistency in dirstate file %(dirstate_path)s.\n"
            "Error: %(description)s")

    def __init__(self, dirstate_path, description):
        BzrError.__init__(self)
        self.dirstate_path = dirstate_path
        self.description = description


class CorruptRepository(BzrError):

    _fmt = ("An error has been detected in the repository %(repo_path)s.\n"
            "Please run bzr reconcile on this repository.")

    def __init__(self, repo):
        BzrError.__init__(self)
        self.repo_path = repo.bzrdir.root_transport.base


class InconsistentDelta(BzrError):
    """Used when we get a delta that is not valid."""

    _fmt = ("An inconsistent delta was supplied involving %(path)r,"
            " %(file_id)r\nreason: %(reason)s")

    def __init__(self, path, file_id, reason):
        BzrError.__init__(self)
        self.path = path
        self.file_id = file_id
        self.reason = reason


class UpgradeRequired(BzrError):

    _fmt = "To use this feature you must upgrade your branch at %(path)s."

    def __init__(self, path):
        BzrError.__init__(self)
        self.path = path


class RepositoryUpgradeRequired(UpgradeRequired):

    _fmt = "To use this feature you must upgrade your repository at %(path)s."


class LocalRequiresBoundBranch(BzrError):

    _fmt = "Cannot perform local-only commits on unbound branches."


class InvalidProgressBarType(BzrError):

    _fmt = ("Environment variable BZR_PROGRESS_BAR='%(bar_type)s"
            " is not a supported type Select one of: %(valid_types)s")

    def __init__(self, bar_type, valid_types):
        BzrError.__init__(self, bar_type=bar_type, valid_types=valid_types)


class UnsupportedOperation(BzrError):

    _fmt = ("The method %(mname)s is not supported on"
            " objects of type %(tname)s.")

    def __init__(self, method, method_self):
        self.method = method
        self.mname = method.__name__
        self.tname = type(method_self).__name__


class CannotSetRevisionId(UnsupportedOperation):
    """Raised when a commit is attempting to set a revision id but cant."""


class NonAsciiRevisionId(UnsupportedOperation):
    """Raised when a commit is attempting to set a non-ascii revision id
       but cant.
    """


class BinaryFile(BzrError):

    _fmt = "File is binary but should be text."


class IllegalPath(BzrError):

    _fmt = "The path %(path)s is not permitted on this platform"

    def __init__(self, path):
        BzrError.__init__(self)
        self.path = path


class TestamentMismatch(BzrError):

    _fmt = """Testament did not match expected value.
       For revision_id {%(revision_id)s}, expected {%(expected)s}, measured
       {%(measured)s}"""

    def __init__(self, revision_id, expected, measured):
        self.revision_id = revision_id
        self.expected = expected
        self.measured = measured


class NotABundle(BzrError):

    _fmt = "Not a bzr revision-bundle: %(text)r"

    def __init__(self, text):
        BzrError.__init__(self)
        self.text = text


class BadBundle(BzrError):

    _fmt = "Bad bzr revision-bundle: %(text)r"

    def __init__(self, text):
        BzrError.__init__(self)
        self.text = text


class MalformedHeader(BadBundle):

    _fmt = "Malformed bzr revision-bundle header: %(text)r"


class MalformedPatches(BadBundle):

    _fmt = "Malformed patches in bzr revision-bundle: %(text)r"


class MalformedFooter(BadBundle):

    _fmt = "Malformed footer in bzr revision-bundle: %(text)r"


class UnsupportedEOLMarker(BadBundle):

    _fmt = "End of line marker was not \\n in bzr revision-bundle"

    def __init__(self):
        # XXX: BadBundle's constructor assumes there's explanatory text,
        # but for this there is not
        BzrError.__init__(self)


class IncompatibleBundleFormat(BzrError):

    _fmt = "Bundle format %(bundle_format)s is incompatible with %(other)s"

    def __init__(self, bundle_format, other):
        BzrError.__init__(self)
        self.bundle_format = bundle_format
        self.other = other


class BadInventoryFormat(BzrError):

    _fmt = "Root class for inventory serialization errors"


class UnexpectedInventoryFormat(BadInventoryFormat):

    _fmt = "The inventory was not in the expected format:\n %(msg)s"

    def __init__(self, msg):
        BadInventoryFormat.__init__(self, msg=msg)


class RootNotRich(BzrError):

    _fmt = """This operation requires rich root data storage"""


class NoSmartMedium(InternalBzrError):

    _fmt = "The transport '%(transport)s' cannot tunnel the smart protocol."

    def __init__(self, transport):
        self.transport = transport


class NoSmartServer(NotBranchError):

    _fmt = "No smart server available at %(url)s"

    @symbol_versioning.deprecated_method(symbol_versioning.one_four)
    def __init__(self, url):
        self.url = url


class UnknownSSH(BzrError):

    _fmt = "Unrecognised value for BZR_SSH environment variable: %(vendor)s"

    def __init__(self, vendor):
        BzrError.__init__(self)
        self.vendor = vendor


class SSHVendorNotFound(BzrError):

    _fmt = ("Don't know how to handle SSH connections."
            " Please set BZR_SSH environment variable.")


class GhostRevisionsHaveNoRevno(BzrError):
    """When searching for revnos, if we encounter a ghost, we are stuck"""

    _fmt = ("Could not determine revno for {%(revision_id)s} because"
            " its ancestry shows a ghost at {%(ghost_revision_id)s}")

    def __init__(self, revision_id, ghost_revision_id):
        self.revision_id = revision_id
        self.ghost_revision_id = ghost_revision_id


class GhostRevisionUnusableHere(BzrError):

    _fmt = "Ghost revision {%(revision_id)s} cannot be used here."

    def __init__(self, revision_id):
        BzrError.__init__(self)
        self.revision_id = revision_id


class IllegalUseOfScopeReplacer(InternalBzrError):

    _fmt = ("ScopeReplacer object %(name)r was used incorrectly:"
            " %(msg)s%(extra)s")

    def __init__(self, name, msg, extra=None):
        BzrError.__init__(self)
        self.name = name
        self.msg = msg
        if extra:
            self.extra = ': ' + str(extra)
        else:
            self.extra = ''


class InvalidImportLine(InternalBzrError):

    _fmt = "Not a valid import statement: %(msg)\n%(text)s"

    def __init__(self, text, msg):
        BzrError.__init__(self)
        self.text = text
        self.msg = msg


class ImportNameCollision(InternalBzrError):

    _fmt = ("Tried to import an object to the same name as"
            " an existing object. %(name)s")

    def __init__(self, name):
        BzrError.__init__(self)
        self.name = name


class NotAMergeDirective(BzrError):
    """File starting with %(firstline)r is not a merge directive"""
    def __init__(self, firstline):
        BzrError.__init__(self, firstline=firstline)


class NoMergeSource(BzrError):
    """Raise if no merge source was specified for a merge directive"""

    _fmt = "A merge directive must provide either a bundle or a public"\
        " branch location."


class IllegalMergeDirectivePayload(BzrError):
    """A merge directive contained something other than a patch or bundle"""

    _fmt = "Bad merge directive payload %(start)r"

    def __init__(self, start):
        BzrError(self)
        self.start = start


class PatchVerificationFailed(BzrError):
    """A patch from a merge directive could not be verified"""

    _fmt = "Preview patch does not match requested changes."


class PatchMissing(BzrError):
    """Raise a patch type was specified but no patch supplied"""

    _fmt = "Patch_type was %(patch_type)s, but no patch was supplied."

    def __init__(self, patch_type):
        BzrError.__init__(self)
        self.patch_type = patch_type


class TargetNotBranch(BzrError):
    """A merge directive's target branch is required, but isn't a branch"""

    _fmt = ("Your branch does not have all of the revisions required in "
            "order to merge this merge directive and the target "
            "location specified in the merge directive is not a branch: "
            "%(location)s.")

    def __init__(self, location):
        BzrError.__init__(self)
        self.location = location


class UnsupportedInventoryKind(BzrError):

    _fmt = """Unsupported entry kind %(kind)s"""

    def __init__(self, kind):
        self.kind = kind


class BadSubsumeSource(BzrError):

    _fmt = "Can't subsume %(other_tree)s into %(tree)s. %(reason)s"

    def __init__(self, tree, other_tree, reason):
        self.tree = tree
        self.other_tree = other_tree
        self.reason = reason


class SubsumeTargetNeedsUpgrade(BzrError):

    _fmt = """Subsume target %(other_tree)s needs to be upgraded."""

    def __init__(self, other_tree):
        self.other_tree = other_tree


class BadReferenceTarget(InternalBzrError):

    _fmt = "Can't add reference to %(other_tree)s into %(tree)s." \
           "%(reason)s"

    def __init__(self, tree, other_tree, reason):
        self.tree = tree
        self.other_tree = other_tree
        self.reason = reason


class NoSuchTag(BzrError):

    _fmt = "No such tag: %(tag_name)s"

    def __init__(self, tag_name):
        self.tag_name = tag_name


class TagsNotSupported(BzrError):

    _fmt = ("Tags not supported by %(branch)s;"
            " you may be able to use bzr upgrade.")

    def __init__(self, branch):
        self.branch = branch


class TagAlreadyExists(BzrError):

    _fmt = "Tag %(tag_name)s already exists."

    def __init__(self, tag_name):
        self.tag_name = tag_name


class MalformedBugIdentifier(BzrError):

    _fmt = "Did not understand bug identifier %(bug_id)s: %(reason)s"

    def __init__(self, bug_id, reason):
        self.bug_id = bug_id
        self.reason = reason


class InvalidBugTrackerURL(BzrError):

    _fmt = ("The URL for bug tracker \"%(abbreviation)s\" doesn't "
            "contain {id}: %(url)s")

    def __init__(self, abbreviation, url):
        self.abbreviation = abbreviation
        self.url = url


class UnknownBugTrackerAbbreviation(BzrError):

    _fmt = ("Cannot find registered bug tracker called %(abbreviation)s "
            "on %(branch)s")

    def __init__(self, abbreviation, branch):
        self.abbreviation = abbreviation
        self.branch = branch


class UnexpectedSmartServerResponse(BzrError):

    _fmt = "Could not understand response from smart server: %(response_tuple)r"

    def __init__(self, response_tuple):
        self.response_tuple = response_tuple


class ErrorFromSmartServer(BzrError):
    """An error was received from a smart server.

    :seealso: UnknownErrorFromSmartServer
    """

    _fmt = "Error received from smart server: %(error_tuple)r"

    internal_error = True

    def __init__(self, error_tuple):
        self.error_tuple = error_tuple
        try:
            self.error_verb = error_tuple[0]
        except IndexError:
            self.error_verb = None
        self.error_args = error_tuple[1:]


class UnknownErrorFromSmartServer(BzrError):
    """An ErrorFromSmartServer could not be translated into a typical bzrlib
    error.

    This is distinct from ErrorFromSmartServer so that it is possible to
    distinguish between the following two cases:
      - ErrorFromSmartServer was uncaught.  This is logic error in the client
        and so should provoke a traceback to the user.
      - ErrorFromSmartServer was caught but its error_tuple could not be
        translated.  This is probably because the server sent us garbage, and
        should not provoke a traceback.
    """

    _fmt = "Server sent an unexpected error: %(error_tuple)r"

    internal_error = False

    def __init__(self, error_from_smart_server):
        """Constructor.

        :param error_from_smart_server: An ErrorFromSmartServer instance.
        """
        self.error_from_smart_server = error_from_smart_server
        self.error_tuple = error_from_smart_server.error_tuple


class ContainerError(BzrError):
    """Base class of container errors."""


class UnknownContainerFormatError(ContainerError):

    _fmt = "Unrecognised container format: %(container_format)r"

    def __init__(self, container_format):
        self.container_format = container_format


class UnexpectedEndOfContainerError(ContainerError):

    _fmt = "Unexpected end of container stream"


class UnknownRecordTypeError(ContainerError):

    _fmt = "Unknown record type: %(record_type)r"

    def __init__(self, record_type):
        self.record_type = record_type


class InvalidRecordError(ContainerError):

    _fmt = "Invalid record: %(reason)s"

    def __init__(self, reason):
        self.reason = reason


class ContainerHasExcessDataError(ContainerError):

    _fmt = "Container has data after end marker: %(excess)r"

    def __init__(self, excess):
        self.excess = excess


class DuplicateRecordNameError(ContainerError):

    _fmt = "Container has multiple records with the same name: %(name)s"

    def __init__(self, name):
        self.name = name


class NoDestinationAddress(InternalBzrError):

    _fmt = "Message does not have a destination address."


class RepositoryDataStreamError(BzrError):

    _fmt = "Corrupt or incompatible data stream: %(reason)s"

    def __init__(self, reason):
        self.reason = reason


class SMTPError(BzrError):

    _fmt = "SMTP error: %(error)s"

    def __init__(self, error):
        self.error = error


class NoMessageSupplied(BzrError):

    _fmt = "No message supplied."


class NoMailAddressSpecified(BzrError):

    _fmt = "No mail-to address (--mail-to) or output (-o) specified."


class UnknownMailClient(BzrError):

    _fmt = "Unknown mail client: %(mail_client)s"

    def __init__(self, mail_client):
        BzrError.__init__(self, mail_client=mail_client)


class MailClientNotFound(BzrError):

    _fmt = "Unable to find mail client with the following names:"\
        " %(mail_command_list_string)s"

    def __init__(self, mail_command_list):
        mail_command_list_string = ', '.join(mail_command_list)
        BzrError.__init__(self, mail_command_list=mail_command_list,
                          mail_command_list_string=mail_command_list_string)

class SMTPConnectionRefused(SMTPError):

    _fmt = "SMTP connection to %(host)s refused"

    def __init__(self, error, host):
        self.error = error
        self.host = host


class DefaultSMTPConnectionRefused(SMTPConnectionRefused):

    _fmt = "Please specify smtp_server.  No server at default %(host)s."


class BzrDirError(BzrError):

    def __init__(self, bzrdir):
        import bzrlib.urlutils as urlutils
        display_url = urlutils.unescape_for_display(bzrdir.root_transport.base,
                                                    'ascii')
        BzrError.__init__(self, bzrdir=bzrdir, display_url=display_url)


class UnsyncedBranches(BzrDirError):

    _fmt = ("'%(display_url)s' is not in sync with %(target_url)s.  See"
            " bzr help sync-for-reconfigure.")

    def __init__(self, bzrdir, target_branch):
        BzrDirError.__init__(self, bzrdir)
        import bzrlib.urlutils as urlutils
        self.target_url = urlutils.unescape_for_display(target_branch.base,
                                                        'ascii')


class AlreadyBranch(BzrDirError):

    _fmt = "'%(display_url)s' is already a branch."


class AlreadyTree(BzrDirError):

    _fmt = "'%(display_url)s' is already a tree."


class AlreadyCheckout(BzrDirError):

    _fmt = "'%(display_url)s' is already a checkout."


class AlreadyLightweightCheckout(BzrDirError):

    _fmt = "'%(display_url)s' is already a lightweight checkout."


class AlreadyUsingShared(BzrDirError):

    _fmt = "'%(display_url)s' is already using a shared repository."


class AlreadyStandalone(BzrDirError):

    _fmt = "'%(display_url)s' is already standalone."


class AlreadyWithTrees(BzrDirError):

    _fmt = ("Shared repository '%(display_url)s' already creates "
            "working trees.")


class AlreadyWithNoTrees(BzrDirError):

    _fmt = ("Shared repository '%(display_url)s' already doesn't create "
            "working trees.")


class ReconfigurationNotSupported(BzrDirError):

    _fmt = "Requested reconfiguration of '%(display_url)s' is not supported."


class NoBindLocation(BzrDirError):

    _fmt = "No location could be found to bind to at %(display_url)s."


class UncommittedChanges(BzrError):

    _fmt = 'Working tree "%(display_url)s" has uncommitted changes.'

    def __init__(self, tree):
        import bzrlib.urlutils as urlutils
        display_url = urlutils.unescape_for_display(
            tree.bzrdir.root_transport.base, 'ascii')
        BzrError.__init__(self, tree=tree, display_url=display_url)


class MissingTemplateVariable(BzrError):

    _fmt = 'Variable {%(name)s} is not available.'

    def __init__(self, name):
        self.name = name


class NoTemplate(BzrError):

    _fmt = 'No template specified.'


class UnableCreateSymlink(BzrError):

    _fmt = 'Unable to create symlink %(path_str)son this platform'

    def __init__(self, path=None):
        path_str = ''
        if path:
            try:
                path_str = repr(str(path))
            except UnicodeEncodeError:
                path_str = repr(path)
            path_str += ' '
        self.path_str = path_str


class UnsupportedTimezoneFormat(BzrError):

    _fmt = ('Unsupported timezone format "%(timezone)s", '
            'options are "utc", "original", "local".')

    def __init__(self, timezone):
        self.timezone = timezone


class CommandAvailableInPlugin(StandardError):

    internal_error = False

    def __init__(self, cmd_name, plugin_metadata, provider):

        self.plugin_metadata = plugin_metadata
        self.cmd_name = cmd_name
        self.provider = provider

    def __str__(self):

        _fmt = ('"%s" is not a standard bzr command. \n'
                'However, the following official plugin provides this command: %s\n'
                'You can install it by going to: %s'
                % (self.cmd_name, self.plugin_metadata['name'],
                    self.plugin_metadata['url']))

        return _fmt


class NoPluginAvailable(BzrError):
    pass


class NotATerminal(BzrError):

    _fmt = 'Unable to ask for a password without real terminal.'


class UnableEncodePath(BzrError):

    _fmt = ('Unable to encode %(kind)s path %(path)r in '
            'user encoding %(user_encoding)s')

    def __init__(self, path, kind):
        from bzrlib.osutils import get_user_encoding
        self.path = path
        self.kind = kind
        self.user_encoding = osutils.get_user_encoding()


class NoSuchAlias(BzrError):

    _fmt = ('The alias "%(alias_name)s" does not exist.')

    def __init__(self, alias_name):
        BzrError.__init__(self, alias_name=alias_name)


class DirectoryLookupFailure(BzrError):
    """Base type for lookup errors."""

    pass


class InvalidLocationAlias(DirectoryLookupFailure):

    _fmt = '"%(alias_name)s" is not a valid location alias.'

    def __init__(self, alias_name):
        DirectoryLookupFailure.__init__(self, alias_name=alias_name)


class UnsetLocationAlias(DirectoryLookupFailure):

    _fmt = 'No %(alias_name)s location assigned.'

    def __init__(self, alias_name):
        DirectoryLookupFailure.__init__(self, alias_name=alias_name[1:])


class CannotBindAddress(BzrError):

    _fmt = 'Cannot bind address "%(host)s:%(port)i": %(orig_error)s.'

    def __init__(self, host, port, orig_error):
        BzrError.__init__(self, host=host, port=port,
            orig_error=orig_error[1])


class UnknownRules(BzrError):

    _fmt = ('Unknown rules detected: %(unknowns_str)s.')

    def __init__(self, unknowns):
        BzrError.__init__(self, unknowns_str=", ".join(unknowns))


class HookFailed(BzrError):
    """Raised when a pre_change_branch_tip hook function fails anything other
    than TipChangeRejected.
    """

    _fmt = ("Hook '%(hook_name)s' during %(hook_stage)s failed:\n"
            "%(traceback_text)s%(exc_value)s")

    def __init__(self, hook_stage, hook_name, exc_info):
        import traceback
        self.hook_stage = hook_stage
        self.hook_name = hook_name
        self.exc_info = exc_info
        self.exc_type = exc_info[0]
        self.exc_value = exc_info[1]
        self.exc_tb = exc_info[2]
        self.traceback_text = ''.join(traceback.format_tb(self.exc_tb))


class TipChangeRejected(BzrError):
    """A pre_change_branch_tip hook function may raise this to cleanly and
    explicitly abort a change to a branch tip.
    """

    _fmt = u"Tip change rejected: %(msg)s"

    def __init__(self, msg):
        self.msg = msg


class ShelfCorrupt(BzrError):

    _fmt = "Shelf corrupt."


class NoSuchShelfId(BzrError):

    _fmt = 'No changes are shelved with id "%(shelf_id)d".'

    def __init__(self, shelf_id):
        BzrError.__init__(self, shelf_id=shelf_id)


class InvalidShelfId(BzrError):

    _fmt = '"%(invalid_id)s" is not a valid shelf id, try a number instead.'

    def __init__(self, invalid_id):
        BzrError.__init__(self, invalid_id=invalid_id)


class UserAbort(BzrError):

    _fmt = 'The user aborted the operation.'


class MustHaveWorkingTree(BzrError):

    _fmt = ("Branching '%(url)s'(%(format)s) must create a working tree.")

    def __init__(self, format, url):
        BzrError.__init__(self, format=format, url=url)


class NoSuchView(BzrError):
    """A view does not exist.
    """

    _fmt = u"No such view: %(view_name)s."

    def __init__(self, view_name):
        self.view_name = view_name


class ViewsNotSupported(BzrError):
    """Views are not supported by a tree format.
    """

    _fmt = ("Views are not supported by %(tree)s;"
            " use 'bzr upgrade' to change your tree to a later format.")

    def __init__(self, tree):
        self.tree = tree


class FileOutsideView(BzrError):

    _fmt = ('Specified file "%(file_name)s" is outside the current view: '
            '%(view_str)s')

    def __init__(self, file_name, view_files):
        self.file_name = file_name
        self.view_str = ", ".join(view_files)


class UnresumableWriteGroup(BzrError):

    _fmt = ("Repository %(repository)s cannot resume write group "
            "%(write_groups)r: %(reason)s")

    internal_error = True

    def __init__(self, repository, write_groups, reason):
        self.repository = repository
        self.write_groups = write_groups
        self.reason = reason


class UnsuspendableWriteGroup(BzrError):

    _fmt = ("Repository %(repository)s cannot suspend a write group.")

    internal_error = True

    def __init__(self, repository):
        self.repository = repository