1
# Copyright (C) 2005-2010 Canonical Ltd
1
# Copyright (C) 2005 Robey Pointer <robey@lag.net>, Canonical Ltd
3
3
# This program is free software; you can redistribute it and/or modify
4
4
# it under the terms of the GNU General Public License as published by
5
5
# the Free Software Foundation; either version 2 of the License, or
6
6
# (at your option) any later version.
8
8
# This program is distributed in the hope that it will be useful,
9
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
11
# GNU General Public License for more details.
13
13
# You should have received a copy of the GNU General Public License
14
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
17
"""Implementation of Transport over SFTP, using paramiko."""
19
# TODO: Remove the transport-based lock_read and lock_write methods. They'll
20
# then raise TransportNotPossible, which will break remote access to any
21
# formats which rely on OS-level locks. That should be fine as those formats
22
# are pretty old, but these combinations may have to be removed from the test
23
# suite. Those formats all date back to 0.7; so we should be able to remove
24
# these methods when we officially drop support for those formats.
44
from bzrlib.errors import (FileExists,
45
NoSuchFile, PathNotChild,
32
from bzrlib.errors import (FileExists,
33
TransportNotPossible, NoSuchFile, PathNotChild,
51
from bzrlib.osutils import pathjoin, fancy_rename, getcwd
52
from bzrlib.symbol_versioning import (
55
from bzrlib.trace import mutter, warning
56
from bzrlib.transport import (
65
# Disable one particular warning that comes from paramiko in Python2.5; if
66
# this is emitted at the wrong time it tends to cause spurious test failures
67
# or at least noise in the test case::
69
# [1770/7639 in 86s, 1 known failures, 50 skipped, 2 missing features]
70
# test_permissions.TestSftpPermissions.test_new_files
71
# /var/lib/python-support/python2.5/paramiko/message.py:226: DeprecationWarning: integer argument expected, got float
72
# self.packet.write(struct.pack('>I', n))
73
warnings.filterwarnings('ignore',
74
'integer argument expected, got float',
75
category=DeprecationWarning,
76
module='paramiko.message')
36
from bzrlib.config import config_dir, ensure_config_dir_exists
37
from bzrlib.trace import mutter, warning, error
38
from bzrlib.transport import Transport, register_transport
39
from bzrlib.osutils import pathjoin, fancy_rename
80
except ImportError, e:
81
raise ParamikoNotPresent(e)
45
error('The SFTP transport requires paramiko.')
83
48
from paramiko.sftp import (SFTP_FLAG_WRITE, SFTP_FLAG_CREATE,
84
49
SFTP_FLAG_EXCL, SFTP_FLAG_TRUNC,
85
SFTP_OK, CMD_HANDLE, CMD_OPEN)
86
51
from paramiko.sftp_attr import SFTPAttributes
87
52
from paramiko.sftp_file import SFTPFile
90
_paramiko_version = getattr(paramiko, '__version_info__', (0, 0, 0))
91
# don't use prefetch unless paramiko version >= 1.5.5 (there were bugs earlier)
92
_default_do_prefetch = (_paramiko_version >= (1, 5, 5))
53
from paramiko.sftp_client import SFTPClient
55
if 'sftp' not in urlparse.uses_netloc: urlparse.uses_netloc.append('sftp')
59
if sys.platform == 'win32':
60
# close_fds not supported on win32
64
def _get_ssh_vendor():
65
"""Find out what version of SSH is on the system."""
67
if _ssh_vendor is not None:
73
p = subprocess.Popen(['ssh', '-V'],
75
stdin=subprocess.PIPE,
76
stdout=subprocess.PIPE,
77
stderr=subprocess.PIPE)
78
returncode = p.returncode
79
stdout, stderr = p.communicate()
83
if 'OpenSSH' in stderr:
84
mutter('ssh implementation is OpenSSH')
85
_ssh_vendor = 'openssh'
86
elif 'SSH Secure Shell' in stderr:
87
mutter('ssh implementation is SSH Corp.')
90
if _ssh_vendor != 'none':
93
# XXX: 20051123 jamesh
94
# A check for putty's plink or lsh would go here.
96
mutter('falling back to paramiko implementation')
100
class SFTPSubprocess:
101
"""A socket-like object that talks to an ssh subprocess via pipes."""
102
def __init__(self, hostname, port=None, user=None):
103
vendor = _get_ssh_vendor()
104
assert vendor in ['openssh', 'ssh']
105
if vendor == 'openssh':
107
'-oForwardX11=no', '-oForwardAgent=no',
108
'-oClearAllForwardings=yes', '-oProtocol=2',
109
'-oNoHostAuthenticationForLocalhost=yes']
111
args.extend(['-p', str(port)])
113
args.extend(['-l', user])
114
args.extend(['-s', hostname, 'sftp'])
115
elif vendor == 'ssh':
118
args.extend(['-p', str(port)])
120
args.extend(['-l', user])
121
args.extend(['-s', 'sftp', hostname])
123
self.proc = subprocess.Popen(args, close_fds=_close_fds,
124
stdin=subprocess.PIPE,
125
stdout=subprocess.PIPE)
127
def send(self, data):
128
return os.write(self.proc.stdin.fileno(), data)
130
def recv_ready(self):
131
# TODO: jam 20051215 this function is necessary to support the
132
# pipelined() function. In reality, it probably should use
133
# poll() or select() to actually return if there is data
134
# available, otherwise we probably don't get any benefit
137
def recv(self, count):
138
return os.read(self.proc.stdout.fileno(), count)
141
self.proc.stdin.close()
142
self.proc.stdout.close()
149
# This is a weakref dictionary, so that we can reuse connections
150
# that are still active. Long term, it might be nice to have some
151
# sort of expiration policy, such as disconnect if inactive for
152
# X seconds. But that requires a lot more fanciness.
153
_connected_hosts = weakref.WeakValueDictionary()
155
def load_host_keys():
157
Load system host keys (probably doesn't work on windows) and any
158
"discovered" keys from previous sessions.
160
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
162
SYSTEM_HOSTKEYS = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
164
mutter('failed to load system host keys: ' + str(e))
165
bzr_hostkey_path = pathjoin(config_dir(), 'ssh_host_keys')
167
BZR_HOSTKEYS = paramiko.util.load_host_keys(bzr_hostkey_path)
169
mutter('failed to load bzr host keys: ' + str(e))
172
def save_host_keys():
174
Save "discovered" host keys in $(config)/ssh_host_keys/.
176
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
177
bzr_hostkey_path = pathjoin(config_dir(), 'ssh_host_keys')
178
ensure_config_dir_exists()
181
f = open(bzr_hostkey_path, 'w')
182
f.write('# SSH host keys collected by bzr\n')
183
for hostname, keys in BZR_HOSTKEYS.iteritems():
184
for keytype, key in keys.iteritems():
185
f.write('%s %s %s\n' % (hostname, keytype, key.get_base64()))
188
mutter('failed to save bzr host keys: ' + str(e))
95
191
class SFTPLock(object):
96
"""This fakes a lock in a remote location.
98
A present lock is indicated just by the existence of a file. This
99
doesn't work well on all transports and they are only used in
100
deprecated storage formats.
192
"""This fakes a lock in a remote location."""
103
193
__slots__ = ['path', 'lock_path', 'lock_file', 'transport']
105
194
def __init__(self, path, transport):
195
assert isinstance(transport, SFTPTransport)
106
197
self.lock_file = None
108
199
self.lock_path = path + '.write-lock'
109
200
self.transport = transport
111
# RBC 20060103 FIXME should we be using private methods here ?
112
abspath = transport._remote_path(self.lock_path)
202
abspath = transport._abspath(self.lock_path)
113
203
self.lock_file = transport._sftp_open_exclusive(abspath)
114
204
except FileExists:
115
205
raise LockError('File %r already locked' % (self.path,))
131
221
# What specific errors should we catch here?
135
class _SFTPReadvHelper(object):
136
"""A class to help with managing the state of a readv request."""
138
# See _get_requests for an explanation.
139
_max_request_size = 32768
141
def __init__(self, original_offsets, relpath, _report_activity):
142
"""Create a new readv helper.
144
:param original_offsets: The original requests given by the caller of
146
:param relpath: The name of the file (if known)
147
:param _report_activity: A Transport._report_activity bound method,
148
to be called as data arrives.
150
self.original_offsets = list(original_offsets)
151
self.relpath = relpath
152
self._report_activity = _report_activity
154
def _get_requests(self):
155
"""Break up the offsets into individual requests over sftp.
157
The SFTP spec only requires implementers to support 32kB requests. We
158
could try something larger (openssh supports 64kB), but then we have to
159
handle requests that fail.
160
So instead, we just break up our maximum chunks into 32kB chunks, and
161
asyncronously requests them.
162
Newer versions of paramiko would do the chunking for us, but we want to
163
start processing results right away, so we do it ourselves.
165
# TODO: Because we issue async requests, we don't 'fudge' any extra
166
# data. I'm not 100% sure that is the best choice.
168
# The first thing we do, is to collapse the individual requests as much
169
# as possible, so we don't issues requests <32kB
170
sorted_offsets = sorted(self.original_offsets)
171
coalesced = list(ConnectedTransport._coalesce_offsets(sorted_offsets,
172
limit=0, fudge_factor=0))
174
for c_offset in coalesced:
175
start = c_offset.start
176
size = c_offset.length
178
# Break this up into 32kB requests
180
next_size = min(size, self._max_request_size)
181
requests.append((start, next_size))
184
if 'sftp' in debug.debug_flags:
185
mutter('SFTP.readv(%s) %s offsets => %s coalesced => %s requests',
186
self.relpath, len(sorted_offsets), len(coalesced),
190
def request_and_yield_offsets(self, fp):
191
"""Request the data from the remote machine, yielding the results.
193
:param fp: A Paramiko SFTPFile object that supports readv.
194
:return: Yield the data requested by the original readv caller, one by
197
requests = self._get_requests()
198
offset_iter = iter(self.original_offsets)
199
cur_offset, cur_size = offset_iter.next()
200
# paramiko .readv() yields strings that are in the order of the requests
201
# So we track the current request to know where the next data is
202
# being returned from.
208
# This is used to buffer chunks which we couldn't process yet
209
# It is (start, end, data) tuples.
211
# Create an 'unlimited' data stream, so we stop based on requests,
212
# rather than just because the data stream ended. This lets us detect
214
data_stream = itertools.chain(fp.readv(requests),
215
itertools.repeat(None))
216
for (start, length), data in itertools.izip(requests, data_stream):
218
if cur_coalesced is not None:
219
raise errors.ShortReadvError(self.relpath,
220
start, length, len(data))
221
if len(data) != length:
222
raise errors.ShortReadvError(self.relpath,
223
start, length, len(data))
224
self._report_activity(length, 'read')
226
# This is the first request, just buffer it
227
buffered_data = [data]
228
buffered_len = length
230
elif start == last_end:
231
# The data we are reading fits neatly on the previous
232
# buffer, so this is all part of a larger coalesced range.
233
buffered_data.append(data)
234
buffered_len += length
224
class SFTPTransport (Transport):
226
Transport implementation for SFTP access.
228
_do_prefetch = False # Right now Paramiko's prefetch support causes things to hang
230
def __init__(self, base, clone_from=None):
231
assert base.startswith('sftp://')
232
self._parse_url(base)
233
base = self._unparse_url()
234
super(SFTPTransport, self).__init__(base)
235
if clone_from is None:
238
# use the same ssh connection, etc
239
self._sftp = clone_from._sftp
240
# super saves 'self.base'
242
def should_cache(self):
244
Return True if the data pulled across should be cached locally.
248
def clone(self, offset=None):
250
Return a new SFTPTransport with root at self.base + offset.
251
We share the same SFTP session between such transports, because it's
252
fairly expensive to set them up.
255
return SFTPTransport(self.base, self)
257
return SFTPTransport(self.abspath(offset), self)
259
def abspath(self, relpath):
261
Return the full url to the given relative path.
263
@param relpath: the relative path or path components
264
@type relpath: str or list
266
return self._unparse_url(self._abspath(relpath))
268
def _abspath(self, relpath):
269
"""Return the absolute path segment without the SFTP URL."""
270
# FIXME: share the common code across transports
271
assert isinstance(relpath, basestring)
272
relpath = [urllib.unquote(relpath)]
273
basepath = self._path.split('/')
274
if len(basepath) > 0 and basepath[-1] == '':
275
basepath = basepath[:-1]
279
if len(basepath) == 0:
280
# In most filesystems, a request for the parent
281
# of root, just returns root.
236
# We have an 'interrupt' in the data stream. So we know we are
237
# at a request boundary.
239
# We haven't consumed the buffer so far, so put it into
240
# data_chunks, and continue.
241
buffered = ''.join(buffered_data)
242
data_chunks.append((input_start, buffered))
244
buffered_data = [data]
245
buffered_len = length
246
last_end = start + length
247
if input_start == cur_offset and cur_size <= buffered_len:
248
# Simplify the next steps a bit by transforming buffered_data
249
# into a single string. We also have the nice property that
250
# when there is only one string ''.join([x]) == x, so there is
252
buffered = ''.join(buffered_data)
253
# Clean out buffered data so that we keep memory
257
# TODO: We *could* also consider the case where cur_offset is in
258
# in the buffered range, even though it doesn't *start*
259
# the buffered range. But for packs we pretty much always
260
# read in order, so you won't get any extra data in the
262
while (input_start == cur_offset
263
and (buffered_offset + cur_size) <= buffered_len):
264
# We've buffered enough data to process this request, spit it
266
cur_data = buffered[buffered_offset:buffered_offset + cur_size]
267
# move the direct pointer into our buffered data
268
buffered_offset += cur_size
269
# Move the start-of-buffer pointer
270
input_start += cur_size
271
# Yield the requested data
272
yield cur_offset, cur_data
273
cur_offset, cur_size = offset_iter.next()
274
# at this point, we've consumed as much of buffered as we can,
275
# so break off the portion that we consumed
276
if buffered_offset == len(buffered_data):
277
# No tail to leave behind
281
buffered = buffered[buffered_offset:]
282
buffered_data = [buffered]
283
buffered_len = len(buffered)
285
buffered = ''.join(buffered_data)
287
data_chunks.append((input_start, buffered))
289
if 'sftp' in debug.debug_flags:
290
mutter('SFTP readv left with %d out-of-order bytes',
291
sum(map(lambda x: len(x[1]), data_chunks)))
292
# We've processed all the readv data, at this point, anything we
293
# couldn't process is in data_chunks. This doesn't happen often, so
294
# this code path isn't optimized
295
# We use an interesting process for data_chunks
296
# Specifically if we have "bisect_left([(start, len, entries)],
298
# If start == qstart, then we get the specific node. Otherwise we
299
# get the previous node
301
idx = bisect.bisect_left(data_chunks, (cur_offset,))
302
if idx < len(data_chunks) and data_chunks[idx][0] == cur_offset:
303
# The data starts here
304
data = data_chunks[idx][1][:cur_size]
306
# The data is in a portion of a previous page
308
sub_offset = cur_offset - data_chunks[idx][0]
309
data = data_chunks[idx][1]
310
data = data[sub_offset:sub_offset + cur_size]
312
# We are missing the page where the data should be found,
315
if len(data) != cur_size:
316
raise AssertionError('We must have miscalulated.'
317
' We expected %d bytes, but only found %d'
318
% (cur_size, len(data)))
319
yield cur_offset, data
320
cur_offset, cur_size = offset_iter.next()
323
class SFTPTransport(ConnectedTransport):
324
"""Transport implementation for SFTP access."""
326
_do_prefetch = _default_do_prefetch
327
# TODO: jam 20060717 Conceivably these could be configurable, either
328
# by auto-tuning at run-time, or by a configuration (per host??)
329
# but the performance curve is pretty flat, so just going with
330
# reasonable defaults.
331
_max_readv_combine = 200
332
# Having to round trip to the server means waiting for a response,
333
# so it is better to download extra bytes.
334
# 8KiB had good performance for both local and remote network operations
335
_bytes_to_read_before_seek = 8192
337
# The sftp spec says that implementations SHOULD allow reads
338
# to be at least 32K. paramiko.readv() does an async request
339
# for the chunks. So we need to keep it within a single request
340
# size for paramiko <= 1.6.1. paramiko 1.6.2 will probably chop
341
# up the request itself, rather than us having to worry about it
342
_max_request_size = 32768
344
def __init__(self, base, _from_transport=None):
345
super(SFTPTransport, self).__init__(base,
346
_from_transport=_from_transport)
348
def _remote_path(self, relpath):
349
"""Return the path to be passed along the sftp protocol for relpath.
351
:param relpath: is a urlencoded string.
353
relative = urlutils.unescape(relpath).encode('utf-8')
354
remote_path = self._combine_paths(self._path, relative)
355
# the initial slash should be removed from the path, and treated as a
356
# homedir relative path (the path begins with a double slash if it is
357
# absolute). see draft-ietf-secsh-scp-sftp-ssh-uri-03.txt
358
# RBC 20060118 we are not using this as its too user hostile. instead
359
# we are following lftp and using /~/foo to mean '~/foo'
360
# vila--20070602 and leave absolute paths begin with a single slash.
361
if remote_path.startswith('/~/'):
362
remote_path = remote_path[3:]
363
elif remote_path == '/~':
367
def _create_connection(self, credentials=None):
368
"""Create a new connection with the provided credentials.
370
:param credentials: The credentials needed to establish the connection.
372
:return: The created connection and its associated credentials.
374
The credentials are only the password as it may have been entered
375
interactively by the user and may be different from the one provided
376
in base url at transport creation time.
378
if credentials is None:
379
password = self._password
381
password = credentials
383
vendor = ssh._get_ssh_vendor()
386
auth = config.AuthenticationConfig()
387
user = auth.get_user('ssh', self._host, self._port)
388
connection = vendor.connect_sftp(self._user, password,
389
self._host, self._port)
390
return connection, (user, password)
393
"""Ensures that a connection is established"""
394
connection = self._get_connection()
395
if connection is None:
396
# First connection ever
397
connection, credentials = self._create_connection()
398
self._set_connection(connection, credentials)
289
path = '/'.join(basepath)
290
# could still be a "relative" path here, but relative on the sftp server
293
def relpath(self, abspath):
294
username, password, host, port, path = self._split_url(abspath)
296
if (username != self._username):
297
error.append('username mismatch')
298
if (host != self._host):
299
error.append('host mismatch')
300
if (port != self._port):
301
error.append('port mismatch')
302
if (not path.startswith(self._path)):
303
error.append('path mismatch')
305
extra = ': ' + ', '.join(error)
306
raise PathNotChild(abspath, self.base, extra=extra)
308
return path[pl:].lstrip('/')
401
310
def has(self, relpath):
403
312
Does the target location exist?
406
self._get_sftp().stat(self._remote_path(relpath))
407
# stat result is about 20 bytes, let's say
408
self._report_activity(20, 'read')
315
self._sftp.stat(self._abspath(relpath))
413
def get(self, relpath):
414
"""Get the file at the given relative path.
320
def get(self, relpath, decode=False):
322
Get the file at the given relative path.
416
324
:param relpath: The relative path to the file
419
# FIXME: by returning the file directly, we don't pass this
420
# through to report_activity. We could try wrapping the object
421
# before it's returned. For readv and get_bytes it's handled in
422
# the higher-level function.
424
path = self._remote_path(relpath)
425
f = self._get_sftp().file(path, mode='rb')
426
if self._do_prefetch and (getattr(f, 'prefetch', None) is not None):
327
path = self._abspath(relpath)
328
f = self._sftp.file(path, mode='rb')
329
if self._do_prefetch and hasattr(f, 'prefetch'):
429
332
except (IOError, paramiko.SSHException), e:
430
self._translate_io_exception(e, path, ': error retrieving',
431
failure_exc=errors.ReadError)
433
def get_bytes(self, relpath):
434
# reimplement this here so that we can report how many bytes came back
333
self._translate_io_exception(e, path, ': error retrieving')
335
def get_partial(self, relpath, start, length=None):
337
Get just part of a file.
339
:param relpath: Path to the file, relative to base
340
:param start: The starting position to read from
341
:param length: The length to read. A length of None indicates
342
read to the end of the file.
343
:return: A file-like object containing at least the specified bytes.
344
Some implementations may return objects which can be read
345
past this length, but this is not guaranteed.
347
# TODO: implement get_partial_multi to help with knit support
435
348
f = self.get(relpath)
438
self._report_activity(len(bytes), 'read')
443
def _readv(self, relpath, offsets):
444
"""See Transport.readv()"""
445
# We overload the default readv() because we want to use a file
446
# that does not have prefetch enabled.
447
# Also, if we have a new paramiko, it implements an async readv()
452
path = self._remote_path(relpath)
453
fp = self._get_sftp().file(path, mode='rb')
454
readv = getattr(fp, 'readv', None)
456
return self._sftp_readv(fp, offsets, relpath)
457
if 'sftp' in debug.debug_flags:
458
mutter('seek and read %s offsets', len(offsets))
459
return self._seek_and_read(fp, offsets, relpath)
460
except (IOError, paramiko.SSHException), e:
461
self._translate_io_exception(e, path, ': error retrieving')
463
def recommended_page_size(self):
464
"""See Transport.recommended_page_size().
466
For SFTP we suggest a large page size to reduce the overhead
467
introduced by latency.
471
def _sftp_readv(self, fp, offsets, relpath):
472
"""Use the readv() member of fp to do async readv.
474
Then read them using paramiko.readv(). paramiko.readv()
475
does not support ranges > 64K, so it caps the request size, and
476
just reads until it gets all the stuff it wants.
478
helper = _SFTPReadvHelper(offsets, relpath, self._report_activity)
479
return helper.request_and_yield_offsets(fp)
481
def put_file(self, relpath, f, mode=None):
483
Copy the file-like object into the location.
350
if self._do_prefetch and hasattr(f, 'prefetch'):
354
def put(self, relpath, f, mode=None):
356
Copy the file-like or string object into the location.
485
358
:param relpath: Location to put the contents, relative to base.
486
:param f: File-like object.
359
:param f: File-like or string object.
487
360
:param mode: The final mode for the file
489
final_path = self._remote_path(relpath)
490
return self._put(final_path, f, mode=mode)
362
final_path = self._abspath(relpath)
363
self._put(final_path, f, mode=mode)
492
365
def _put(self, abspath, f, mode=None):
493
366
"""Helper function so both put() and copy_abspaths can reuse the code"""
631
def _mkdir(self, abspath, mode=None):
637
self._report_activity(len(abspath), 'write')
638
self._get_sftp().mkdir(abspath, local_mode)
639
self._report_activity(1, 'read')
641
# chmod a dir through sftp will erase any sgid bit set
642
# on the server side. So, if the bit mode are already
643
# set, avoid the chmod. If the mode is not fine but
644
# the sgid bit is set, report a warning to the user
645
# with the umask fix.
646
stat = self._get_sftp().lstat(abspath)
647
mode = mode & 0777 # can't set special bits anyway
648
if mode != stat.st_mode & 0777:
649
if stat.st_mode & 06000:
650
warning('About to chmod %s over sftp, which will result'
651
' in its suid or sgid bits being cleared. If'
652
' you want to preserve those bits, change your '
653
' environment on the server to use umask 0%03o.'
654
% (abspath, 0777 - mode))
655
self._get_sftp().chmod(abspath, mode=mode)
656
except (paramiko.SSHException, IOError), e:
657
self._translate_io_exception(e, abspath, ': unable to mkdir',
658
failure_exc=FileExists)
660
410
def mkdir(self, relpath, mode=None):
661
411
"""Create a directory at the given path."""
662
self._mkdir(self._remote_path(relpath), mode=mode)
664
def open_write_stream(self, relpath, mode=None):
665
"""See Transport.open_write_stream."""
666
# initialise the file to zero-length
667
# this is three round trips, but we don't use this
668
# api more than once per write_group at the moment so
669
# it is a tolerable overhead. Better would be to truncate
670
# the file after opening. RBC 20070805
671
self.put_bytes_non_atomic(relpath, "", mode)
672
abspath = self._remote_path(relpath)
673
# TODO: jam 20060816 paramiko doesn't publicly expose a way to
674
# set the file mode at create time. If it does, use it.
675
# But for now, we just chmod later anyway.
678
handle = self._get_sftp().file(abspath, mode='wb')
679
handle.set_pipelined(True)
413
path = self._abspath(relpath)
414
# In the paramiko documentation, it says that passing a mode flag
415
# will filtered against the server umask.
416
# StubSFTPServer does not do this, which would be nice, because it is
417
# what we really want :)
418
# However, real servers do use umask, so we really should do it that way
419
self._sftp.mkdir(path)
421
self._sftp.chmod(path, mode=mode)
680
422
except (paramiko.SSHException, IOError), e:
681
self._translate_io_exception(e, abspath,
683
_file_streams[self.abspath(relpath)] = handle
684
return FileFileStream(self, relpath, handle)
423
self._translate_io_exception(e, path, ': unable to mkdir',
424
failure_exc=FileExists)
686
def _translate_io_exception(self, e, path, more_info='',
687
failure_exc=PathError):
426
def _translate_io_exception(self, e, path, more_info='', failure_exc=NoSuchFile):
688
427
"""Translate a paramiko or IOError into a friendlier exception.
690
429
:param e: The original exception
694
433
:param failure_exc: Paramiko has the super fun ability to raise completely
695
434
opaque errors that just set "e.args = ('Failure',)" with
696
435
no more information.
697
If this parameter is set, it defines the exception
698
to raise in these cases.
436
This sometimes means FileExists, but it also sometimes
700
439
# paramiko seems to generate detailless errors.
701
440
self._translate_error(e, path, raise_generic=False)
702
if getattr(e, 'args', None) is not None:
441
if hasattr(e, 'args'):
703
442
if (e.args == ('No such file or directory',) or
704
443
e.args == ('No such file',)):
705
444
raise NoSuchFile(path, str(e) + more_info)
706
if (e.args == ('mkdir failed',) or
707
e.args[0].startswith('syserr: File exists')):
445
if (e.args == ('mkdir failed',)):
708
446
raise FileExists(path, str(e) + more_info)
709
447
# strange but true, for the paramiko server.
710
448
if (e.args == ('Failure',)):
711
449
raise failure_exc(path, str(e) + more_info)
712
# Can be something like args = ('Directory not empty:
713
# '/srv/bazaar.launchpad.net/blah...: '
714
# [Errno 39] Directory not empty',)
715
if (e.args[0].startswith('Directory not empty: ')
716
or getattr(e, 'errno', None) == errno.ENOTEMPTY):
717
raise errors.DirectoryNotEmpty(path, str(e))
718
450
mutter('Raising exception with args %s', e.args)
719
if getattr(e, 'errno', None) is not None:
451
if hasattr(e, 'errno'):
720
452
mutter('Raising exception with errno %s', e.errno)
723
def append_file(self, relpath, f, mode=None):
455
def append(self, relpath, f):
725
457
Append the text in the file-like object into the final
729
path = self._remote_path(relpath)
730
fout = self._get_sftp().file(path, 'ab')
732
self._get_sftp().chmod(path, mode)
461
path = self._abspath(relpath)
462
fout = self._sftp.file(path, 'ab')
734
463
self._pump(f, fout)
736
464
except (IOError, paramiko.SSHException), e:
737
465
self._translate_io_exception(e, relpath, ': unable to append')
739
def rename(self, rel_from, rel_to):
740
"""Rename without special overwriting"""
467
def copy(self, rel_from, rel_to):
468
"""Copy the item at rel_from to the location at rel_to"""
469
path_from = self._abspath(rel_from)
470
path_to = self._abspath(rel_to)
471
self._copy_abspaths(path_from, path_to)
473
def _copy_abspaths(self, path_from, path_to, mode=None):
474
"""Copy files given an absolute path
476
:param path_from: Path on remote server to read
477
:param path_to: Path on remote server to write
480
TODO: Should the destination location be atomically created?
481
This has not been specified
482
TODO: This should use some sort of remote copy, rather than
483
pulling the data locally, and then writing it remotely
742
self._get_sftp().rename(self._remote_path(rel_from),
743
self._remote_path(rel_to))
486
fin = self._sftp.file(path_from, 'rb')
488
self._put(path_to, fin, mode=mode)
744
491
except (IOError, paramiko.SSHException), e:
745
self._translate_io_exception(e, rel_from,
746
': unable to rename to %r' % (rel_to))
748
def _rename_and_overwrite(self, abs_from, abs_to):
492
self._translate_io_exception(e, path_from, ': unable copy to: %r' % path_to)
494
def copy_to(self, relpaths, other, mode=None, pb=None):
495
"""Copy a set of entries from self into another Transport.
497
:param relpaths: A list/generator of entries to be copied.
499
if isinstance(other, SFTPTransport) and other._sftp is self._sftp:
500
# Both from & to are on the same remote filesystem
501
# We can use a remote copy, instead of pulling locally, and pushing
503
total = self._get_total(relpaths)
505
for path in relpaths:
506
path_from = self._abspath(relpath)
507
path_to = other._abspath(relpath)
508
self._update_pb(pb, 'copy-to', count, total)
509
self._copy_abspaths(path_from, path_to, mode=mode)
513
return super(SFTPTransport, self).copy_to(relpaths, other, mode=mode, pb=pb)
515
def _rename(self, abs_from, abs_to):
749
516
"""Do a fancy rename on the remote server.
751
518
Using the implementation provided by osutils.
754
sftp = self._get_sftp()
755
521
fancy_rename(abs_from, abs_to,
756
rename_func=sftp.rename,
757
unlink_func=sftp.remove)
522
rename_func=self._sftp.rename,
523
unlink_func=self._sftp.remove)
758
524
except (IOError, paramiko.SSHException), e:
759
self._translate_io_exception(e, abs_from,
760
': unable to rename to %r' % (abs_to))
525
self._translate_io_exception(e, abs_from, ': unable to rename to %r' % (abs_to))
762
527
def move(self, rel_from, rel_to):
763
528
"""Move the item at rel_from to the location at rel_to"""
764
path_from = self._remote_path(rel_from)
765
path_to = self._remote_path(rel_to)
766
self._rename_and_overwrite(path_from, path_to)
529
path_from = self._abspath(rel_from)
530
path_to = self._abspath(rel_to)
531
self._rename(path_from, path_to)
768
533
def delete(self, relpath):
769
534
"""Delete the item at relpath"""
770
path = self._remote_path(relpath)
535
path = self._abspath(relpath)
772
self._get_sftp().remove(path)
537
self._sftp.remove(path)
773
538
except (IOError, paramiko.SSHException), e:
774
539
self._translate_io_exception(e, path, ': unable to delete')
776
def external_url(self):
777
"""See bzrlib.transport.Transport.external_url."""
778
# the external path for SFTP is the base
781
541
def listable(self):
782
542
"""Return True if this store supports listing."""
862
587
# that we have taken the lock.
863
588
return SFTPLock(relpath, self)
591
def _unparse_url(self, path=None):
594
path = urllib.quote(path)
595
if path.startswith('/'):
596
path = '/%2F' + path[1:]
599
netloc = urllib.quote(self._host)
600
if self._username is not None:
601
netloc = '%s@%s' % (urllib.quote(self._username), netloc)
602
if self._port is not None:
603
netloc = '%s:%d' % (netloc, self._port)
605
return urlparse.urlunparse(('sftp', netloc, path, '', '', ''))
607
def _split_url(self, url):
608
if isinstance(url, unicode):
609
url = url.encode('utf-8')
610
(scheme, netloc, path, params,
611
query, fragment) = urlparse.urlparse(url, allow_fragments=False)
612
assert scheme == 'sftp'
613
username = password = host = port = None
615
username, host = netloc.split('@', 1)
617
username, password = username.split(':', 1)
618
password = urllib.unquote(password)
619
username = urllib.unquote(username)
624
host, port = host.rsplit(':', 1)
628
# TODO: Should this be ConnectionError?
629
raise TransportError('%s: invalid port number' % port)
630
host = urllib.unquote(host)
632
path = urllib.unquote(path)
634
# the initial slash should be removed from the path, and treated
635
# as a homedir relative path (the path begins with a double slash
636
# if it is absolute).
637
# see draft-ietf-secsh-scp-sftp-ssh-uri-03.txt
638
if path.startswith('/'):
641
return (username, password, host, port, path)
643
def _parse_url(self, url):
644
(self._username, self._password,
645
self._host, self._port, self._path) = self._split_url(url)
647
def _sftp_connect(self):
648
"""Connect to the remote sftp server.
649
After this, self._sftp should have a valid connection (or
650
we raise an TransportError 'could not connect').
652
TODO: Raise a more reasonable ConnectionFailed exception
654
global _connected_hosts
656
idx = (self._host, self._port, self._username)
658
self._sftp = _connected_hosts[idx]
663
vendor = _get_ssh_vendor()
665
sock = SFTPSubprocess(self._host, self._port, self._username)
666
self._sftp = SFTPClient(sock)
668
self._paramiko_connect()
670
_connected_hosts[idx] = self._sftp
672
def _paramiko_connect(self):
673
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
678
t = paramiko.Transport((self._host, self._port or 22))
680
except paramiko.SSHException, e:
681
raise ConnectionError('Unable to reach SSH host %s:%d' %
682
(self._host, self._port), e)
684
server_key = t.get_remote_server_key()
685
server_key_hex = paramiko.util.hexify(server_key.get_fingerprint())
686
keytype = server_key.get_name()
687
if SYSTEM_HOSTKEYS.has_key(self._host) and SYSTEM_HOSTKEYS[self._host].has_key(keytype):
688
our_server_key = SYSTEM_HOSTKEYS[self._host][keytype]
689
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
690
elif BZR_HOSTKEYS.has_key(self._host) and BZR_HOSTKEYS[self._host].has_key(keytype):
691
our_server_key = BZR_HOSTKEYS[self._host][keytype]
692
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
694
warning('Adding %s host key for %s: %s' % (keytype, self._host, server_key_hex))
695
if not BZR_HOSTKEYS.has_key(self._host):
696
BZR_HOSTKEYS[self._host] = {}
697
BZR_HOSTKEYS[self._host][keytype] = server_key
698
our_server_key = server_key
699
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
701
if server_key != our_server_key:
702
filename1 = os.path.expanduser('~/.ssh/known_hosts')
703
filename2 = pathjoin(config_dir(), 'ssh_host_keys')
704
raise TransportError('Host keys for %s do not match! %s != %s' % \
705
(self._host, our_server_key_hex, server_key_hex),
706
['Try editing %s or %s' % (filename1, filename2)])
711
self._sftp = t.open_sftp_client()
712
except paramiko.SSHException, e:
713
raise ConnectionError('Unable to start sftp client %s:%d' %
714
(self._host, self._port), e)
716
def _sftp_auth(self, transport):
717
# paramiko requires a username, but it might be none if nothing was supplied
718
# use the local username, just in case.
719
# We don't override self._username, because if we aren't using paramiko,
720
# the username might be specified in ~/.ssh/config and we don't want to
721
# force it to something else
722
# Also, it would mess up the self.relpath() functionality
723
username = self._username or getpass.getuser()
725
# Paramiko tries to open a socket.AF_UNIX in order to connect
726
# to ssh-agent. That attribute doesn't exist on win32 (it does in cygwin)
727
# so we get an AttributeError exception. For now, just don't try to
728
# connect to an agent if we are on win32
729
if sys.platform != 'win32':
730
agent = paramiko.Agent()
731
for key in agent.get_keys():
732
mutter('Trying SSH agent key %s' % paramiko.util.hexify(key.get_fingerprint()))
734
transport.auth_publickey(username, key)
736
except paramiko.SSHException, e:
739
# okay, try finding id_rsa or id_dss? (posix only)
740
if self._try_pkey_auth(transport, paramiko.RSAKey, username, 'id_rsa'):
742
if self._try_pkey_auth(transport, paramiko.DSSKey, username, 'id_dsa'):
748
transport.auth_password(username, self._password)
750
except paramiko.SSHException, e:
753
# FIXME: Don't keep a password held in memory if you can help it
754
#self._password = None
756
# give up and ask for a password
757
password = bzrlib.ui.ui_factory.get_password(
758
prompt='SSH %(user)s@%(host)s password',
759
user=username, host=self._host)
761
transport.auth_password(username, password)
762
except paramiko.SSHException, e:
763
raise ConnectionError('Unable to authenticate to SSH host as %s@%s' %
764
(username, self._host), e)
766
def _try_pkey_auth(self, transport, pkey_class, username, filename):
767
filename = os.path.expanduser('~/.ssh/' + filename)
769
key = pkey_class.from_private_key_file(filename)
770
transport.auth_publickey(username, key)
772
except paramiko.PasswordRequiredException:
773
password = bzrlib.ui.ui_factory.get_password(
774
prompt='SSH %(filename)s password',
777
key = pkey_class.from_private_key_file(filename, password)
778
transport.auth_publickey(username, key)
780
except paramiko.SSHException:
781
mutter('SSH authentication via %s key failed.' % (os.path.basename(filename),))
782
except paramiko.SSHException:
783
mutter('SSH authentication via %s key failed.' % (os.path.basename(filename),))
865
788
def _sftp_open_exclusive(self, abspath, mode=None):
866
789
"""Open a remote path exclusively.
added
removed
bzrlib/transport/sftp.py
