~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006, 2007, 2009, 2010, 2011, 2016 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.

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# You should have received a copy of the GNU General Public License

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Implementation of Transport that adapts another transport to be readonly."""

from __future__ import absolute_import

from bzrlib.errors import TransportNotPossible, NoSmartMedium

from bzrlib.transport import decorator

class ReadonlyTransportDecorator(decorator.TransportDecorator):

    """A decorator that can convert any transport to be readonly.

    This is requested via the 'readonly+' prefix to get_transport().

    """

    def append_file(self, relpath, f, mode=None):

        """See Transport.append_file()."""

        raise TransportNotPossible('readonly transport')

    def append_bytes(self, relpath, bytes, mode=None):

        """See Transport.append_bytes()."""

        raise TransportNotPossible('readonly transport')

    @classmethod

    def _get_url_prefix(self):

        """Readonly transport decorators are invoked via 'readonly+'"""

        return 'readonly+'

    def rename(self, rel_from, rel_to):

        """See Transport.rename."""

        raise TransportNotPossible('readonly transport')

    def delete(self, relpath):

        """See Transport.delete()."""

        raise TransportNotPossible('readonly transport')

    def delete_tree(self, relpath):

        """See Transport.delete_tree()."""

        raise TransportNotPossible('readonly transport')

    def put_file(self, relpath, f, mode=None):

        """See Transport.put_file()."""

        raise TransportNotPossible('readonly transport')

    def put_bytes(self, relpath, bytes, mode=None):

        """See Transport.put_bytes()."""

        raise TransportNotPossible('readonly transport')

    def mkdir(self, relpath, mode=None):

        """See Transport.mkdir()."""

        raise TransportNotPossible('readonly transport')

    def open_write_stream(self, relpath, mode=None):

        """See Transport.open_write_stream()."""

        raise TransportNotPossible('readonly transport')

    def is_readonly(self):

        """See Transport.is_readonly."""

        return True

    def rmdir(self, relpath):

        """See Transport.rmdir."""

        raise TransportNotPossible('readonly transport')

    def lock_write(self, relpath):

        """See Transport.lock_write."""

        raise TransportNotPossible('readonly transport')

    def get_smart_client(self):

        raise NoSmartMedium(self)

    def get_smart_medium(self):

        raise NoSmartMedium(self)

def get_test_permutations():

    """Return the permutations to be used in testing."""

    from bzrlib.tests import test_server

    return [(ReadonlyTransportDecorator, test_server.ReadonlyServer)]