1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
# Copyright (C) 2009, 2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""A transport decorator that filters all paths that are passed to it."""
from bzrlib.transport import (
register_transport,
Server,
Transport,
unregister_transport,
)
class PathFilteringServer(Server):
"""Transport server for PathFilteringTransport.
It holds the backing_transport and filter_func for PathFilteringTransports.
All paths will be passed through filter_func before calling into the
backing_transport.
Note that paths returned from the backing transport are *not* altered in
anyway. So, depending on the filter_func, PathFilteringTransports might
not conform to the usual expectations of Transport behaviour; e.g. 'name'
in t.list_dir('dir') might not imply t.has('dir/name') is True! A filter
that merely prefixes a constant path segment will be essentially
transparent, whereas a filter that does rot13 to paths will break
expectations and probably cause confusing errors. So choose your
filter_func with care.
"""
def __init__(self, backing_transport, filter_func):
"""Constructor.
:param backing_transport: a transport
:param filter_func: a callable that takes paths, and translates them
into paths for use with the backing transport.
"""
self.backing_transport = backing_transport
self.filter_func = filter_func
def _factory(self, url):
return PathFilteringTransport(self, url)
def get_url(self):
return self.scheme
def start_server(self):
self.scheme = 'filtered-%d:///' % id(self)
register_transport(self.scheme, self._factory)
def stop_server(self):
unregister_transport(self.scheme, self._factory)
class PathFilteringTransport(Transport):
"""A PathFilteringTransport.
Please see PathFilteringServer for details.
"""
def __init__(self, server, base):
self.server = server
if not base.endswith('/'):
base += '/'
Transport.__init__(self, base)
self.base_path = self.base[len(self.server.scheme)-1:]
self.scheme = self.server.scheme
def _relpath_from_server_root(self, relpath):
unfiltered_path = self._combine_paths(self.base_path, relpath)
if not unfiltered_path.startswith('/'):
raise ValueError(unfiltered_path)
return unfiltered_path[1:]
def _filter(self, relpath):
return self.server.filter_func(self._relpath_from_server_root(relpath))
def _call(self, methodname, relpath, *args):
"""Helper for Transport methods of the form:
operation(path, [other args ...])
"""
backing_method = getattr(self.server.backing_transport, methodname)
return backing_method(self._filter(relpath), *args)
# Transport methods
def abspath(self, relpath):
# We do *not* want to filter at this point; e.g if the filter is
# homedir expansion, self.base == 'this:///' and relpath == '~/foo',
# then the abspath should be this:///~/foo (not this:///home/user/foo).
# Instead filtering should happen when self's base is passed to the
# backing.
return self.scheme + self._relpath_from_server_root(relpath)
def append_file(self, relpath, f, mode=None):
return self._call('append_file', relpath, f, mode)
def _can_roundtrip_unix_modebits(self):
return self.server.backing_transport._can_roundtrip_unix_modebits()
def clone(self, relpath):
return self.__class__(self.server, self.abspath(relpath))
def delete(self, relpath):
return self._call('delete', relpath)
def delete_tree(self, relpath):
return self._call('delete_tree', relpath)
def external_url(self):
"""See bzrlib.transport.Transport.external_url."""
# PathFilteringTransports, like MemoryTransport, depend on in-process
# state and thus the base cannot simply be handed out. See the base
# class docstring for more details and possible directions. For now we
# return the path-filtered URL.
return self.server.backing_transport.external_url()
def get(self, relpath):
return self._call('get', relpath)
def has(self, relpath):
return self._call('has', relpath)
def is_readonly(self):
return self.server.backing_transport.is_readonly()
def iter_files_recursive(self):
backing_transport = self.server.backing_transport.clone(
self._filter('.'))
return backing_transport.iter_files_recursive()
def listable(self):
return self.server.backing_transport.listable()
def list_dir(self, relpath):
return self._call('list_dir', relpath)
def lock_read(self, relpath):
return self._call('lock_read', relpath)
def lock_write(self, relpath):
return self._call('lock_write', relpath)
def mkdir(self, relpath, mode=None):
return self._call('mkdir', relpath, mode)
def open_write_stream(self, relpath, mode=None):
return self._call('open_write_stream', relpath, mode)
def put_file(self, relpath, f, mode=None):
return self._call('put_file', relpath, f, mode)
def rename(self, rel_from, rel_to):
return self._call('rename', rel_from, self._filter(rel_to))
def rmdir(self, relpath):
return self._call('rmdir', relpath)
def stat(self, relpath):
return self._call('stat', relpath)
def get_test_permutations():
"""Return the permutations to be used in testing."""
from bzrlib.tests import test_server
return [(PathFilteringTransport, test_server.TestingPathFilteringServer)]
|