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# Copyright (C) 2005-2011, 2016, 2017 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# 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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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Implementation of Transport over SFTP, using paramiko."""
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from __future__ import absolute_import
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# TODO: Remove the transport-based lock_read and lock_write methods. They'll
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# then raise TransportNotPossible, which will break remote access to any
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# formats which rely on OS-level locks. That should be fine as those formats
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# are pretty old, but these combinations may have to be removed from the test
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# suite. Those formats all date back to 0.7; so we should be able to remove
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# these methods when we officially drop support for those formats.
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from ..errors import (FileExists,
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from ..osutils import fancy_rename
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from ..sixish import (
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from ..trace import mutter, warning
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from ..transport import (
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# Disable one particular warning that comes from paramiko in Python2.5; if
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# this is emitted at the wrong time it tends to cause spurious test failures
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# or at least noise in the test case::
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# [1770/7639 in 86s, 1 known failures, 50 skipped, 2 missing features]
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# test_permissions.TestSftpPermissions.test_new_files
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# /var/lib/python-support/python2.5/paramiko/message.py:226: DeprecationWarning: integer argument expected, got float
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# self.packet.write(struct.pack('>I', n))
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warnings.filterwarnings('ignore',
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'integer argument expected, got float',
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category=DeprecationWarning,
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module='paramiko.message')
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except ImportError as e:
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raise ParamikoNotPresent(e)
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from paramiko.sftp import (SFTP_FLAG_WRITE, SFTP_FLAG_CREATE,
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SFTP_FLAG_EXCL, SFTP_FLAG_TRUNC,
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from paramiko.sftp_attr import SFTPAttributes
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from paramiko.sftp_file import SFTPFile
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# GZ 2017-05-25: Some dark hackery to monkeypatch out issues with paramiko's
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# Python 3 compatibility code. Replace broken b() and asbytes() code.
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from paramiko.py3compat import b as _bad
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from paramiko.common import asbytes as _bad_asbytes
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def _b_for_broken_paramiko(s, encoding='utf8'):
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"""Hacked b() that does not raise TypeError."""
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# https://github.com/paramiko/paramiko/issues/967
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if not isinstance(s, bytes):
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encode = getattr(s, 'encode', None)
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if encode is not None:
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return encode(encoding)
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# Would like to pass buffer objects along, but have to realise.
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tobytes = getattr(s, 'tobytes', None)
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if tobytes is not None:
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def _asbytes_for_broken_paramiko(s):
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"""Hacked asbytes() that does not raise Exception."""
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# https://github.com/paramiko/paramiko/issues/968
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if not isinstance(s, bytes):
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encode = getattr(s, 'encode', None)
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if encode is not None:
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return encode('utf8')
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asbytes = getattr(s, 'asbytes', None)
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if asbytes is not None:
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_bad.__code__ = _b_for_broken_paramiko.__code__
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_bad_asbytes.__code__ = _asbytes_for_broken_paramiko.__code__
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class SFTPLock(object):
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"""This fakes a lock in a remote location.
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A present lock is indicated just by the existence of a file. This
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doesn't work well on all transports and they are only used in
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deprecated storage formats.
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__slots__ = ['path', 'lock_path', 'lock_file', 'transport']
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def __init__(self, path, transport):
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self.lock_file = None
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self.lock_path = path + '.write-lock'
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self.transport = transport
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# RBC 20060103 FIXME should we be using private methods here ?
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abspath = transport._remote_path(self.lock_path)
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self.lock_file = transport._sftp_open_exclusive(abspath)
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raise LockError('File %r already locked' % (self.path,))
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if not self.lock_file:
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self.lock_file.close()
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self.lock_file = None
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self.transport.delete(self.lock_path)
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except (NoSuchFile,):
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# What specific errors should we catch here?
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class _SFTPReadvHelper(object):
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"""A class to help with managing the state of a readv request."""
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# See _get_requests for an explanation.
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_max_request_size = 32768
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def __init__(self, original_offsets, relpath, _report_activity):
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"""Create a new readv helper.
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:param original_offsets: The original requests given by the caller of
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:param relpath: The name of the file (if known)
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:param _report_activity: A Transport._report_activity bound method,
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to be called as data arrives.
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self.original_offsets = list(original_offsets)
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self.relpath = relpath
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self._report_activity = _report_activity
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def _get_requests(self):
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"""Break up the offsets into individual requests over sftp.
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The SFTP spec only requires implementers to support 32kB requests. We
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could try something larger (openssh supports 64kB), but then we have to
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handle requests that fail.
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So instead, we just break up our maximum chunks into 32kB chunks, and
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asyncronously requests them.
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Newer versions of paramiko would do the chunking for us, but we want to
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start processing results right away, so we do it ourselves.
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# TODO: Because we issue async requests, we don't 'fudge' any extra
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# data. I'm not 100% sure that is the best choice.
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# The first thing we do, is to collapse the individual requests as much
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# as possible, so we don't issues requests <32kB
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sorted_offsets = sorted(self.original_offsets)
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coalesced = list(ConnectedTransport._coalesce_offsets(sorted_offsets,
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limit=0, fudge_factor=0))
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for c_offset in coalesced:
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start = c_offset.start
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size = c_offset.length
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# Break this up into 32kB requests
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next_size = min(size, self._max_request_size)
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requests.append((start, next_size))
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if 'sftp' in debug.debug_flags:
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mutter('SFTP.readv(%s) %s offsets => %s coalesced => %s requests',
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self.relpath, len(sorted_offsets), len(coalesced),
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def request_and_yield_offsets(self, fp):
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"""Request the data from the remote machine, yielding the results.
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:param fp: A Paramiko SFTPFile object that supports readv.
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:return: Yield the data requested by the original readv caller, one by
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requests = self._get_requests()
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offset_iter = iter(self.original_offsets)
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cur_offset, cur_size = next(offset_iter)
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# paramiko .readv() yields strings that are in the order of the requests
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# So we track the current request to know where the next data is
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# being returned from.
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# This is used to buffer chunks which we couldn't process yet
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# It is (start, end, data) tuples.
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# Create an 'unlimited' data stream, so we stop based on requests,
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# rather than just because the data stream ended. This lets us detect
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data_stream = itertools.chain(fp.readv(requests),
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itertools.repeat(None))
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for (start, length), data in zip(requests, data_stream):
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if cur_coalesced is not None:
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raise errors.ShortReadvError(self.relpath,
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start, length, len(data))
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if len(data) != length:
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raise errors.ShortReadvError(self.relpath,
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start, length, len(data))
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self._report_activity(length, 'read')
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# This is the first request, just buffer it
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buffered_data = [data]
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buffered_len = length
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elif start == last_end:
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# The data we are reading fits neatly on the previous
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# buffer, so this is all part of a larger coalesced range.
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buffered_data.append(data)
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buffered_len += length
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# We have an 'interrupt' in the data stream. So we know we are
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# at a request boundary.
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# We haven't consumed the buffer so far, so put it into
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# data_chunks, and continue.
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buffered = b''.join(buffered_data)
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data_chunks.append((input_start, buffered))
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buffered_data = [data]
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buffered_len = length
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last_end = start + length
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if input_start == cur_offset and cur_size <= buffered_len:
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# Simplify the next steps a bit by transforming buffered_data
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# into a single string. We also have the nice property that
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# when there is only one string ''.join([x]) == x, so there is
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buffered = b''.join(buffered_data)
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# Clean out buffered data so that we keep memory
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# TODO: We *could* also consider the case where cur_offset is in
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# in the buffered range, even though it doesn't *start*
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# the buffered range. But for packs we pretty much always
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# read in order, so you won't get any extra data in the
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while (input_start == cur_offset
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and (buffered_offset + cur_size) <= buffered_len):
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# We've buffered enough data to process this request, spit it
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cur_data = buffered[buffered_offset:buffered_offset + cur_size]
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# move the direct pointer into our buffered data
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buffered_offset += cur_size
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# Move the start-of-buffer pointer
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input_start += cur_size
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# Yield the requested data
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yield cur_offset, cur_data
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cur_offset, cur_size = next(offset_iter)
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except StopIteration:
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# at this point, we've consumed as much of buffered as we can,
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# so break off the portion that we consumed
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if buffered_offset == len(buffered_data):
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# No tail to leave behind
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buffered = buffered[buffered_offset:]
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buffered_data = [buffered]
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buffered_len = len(buffered)
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# now that the data stream is done, close the handle
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buffered = b''.join(buffered_data)
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data_chunks.append((input_start, buffered))
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if 'sftp' in debug.debug_flags:
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mutter('SFTP readv left with %d out-of-order bytes',
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sum(len(x[1]) for x in data_chunks))
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# We've processed all the readv data, at this point, anything we
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# couldn't process is in data_chunks. This doesn't happen often, so
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# this code path isn't optimized
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# We use an interesting process for data_chunks
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# Specifically if we have "bisect_left([(start, len, entries)],
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# If start == qstart, then we get the specific node. Otherwise we
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# get the previous node
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idx = bisect.bisect_left(data_chunks, (cur_offset,))
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if idx < len(data_chunks) and data_chunks[idx][0] == cur_offset:
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# The data starts here
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data = data_chunks[idx][1][:cur_size]
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# The data is in a portion of a previous page
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sub_offset = cur_offset - data_chunks[idx][0]
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data = data_chunks[idx][1]
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data = data[sub_offset:sub_offset + cur_size]
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# We are missing the page where the data should be found,
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if len(data) != cur_size:
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raise AssertionError('We must have miscalulated.'
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' We expected %d bytes, but only found %d'
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% (cur_size, len(data)))
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yield cur_offset, data
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cur_offset, cur_size = next(offset_iter)
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except StopIteration:
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class SFTPTransport(ConnectedTransport):
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"""Transport implementation for SFTP access."""
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# TODO: jam 20060717 Conceivably these could be configurable, either
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# by auto-tuning at run-time, or by a configuration (per host??)
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# but the performance curve is pretty flat, so just going with
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# reasonable defaults.
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_max_readv_combine = 200
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# Having to round trip to the server means waiting for a response,
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# so it is better to download extra bytes.
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# 8KiB had good performance for both local and remote network operations
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_bytes_to_read_before_seek = 8192
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# The sftp spec says that implementations SHOULD allow reads
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# to be at least 32K. paramiko.readv() does an async request
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# for the chunks. So we need to keep it within a single request
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# size for paramiko <= 1.6.1. paramiko 1.6.2 will probably chop
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# up the request itself, rather than us having to worry about it
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_max_request_size = 32768
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def _remote_path(self, relpath):
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"""Return the path to be passed along the sftp protocol for relpath.
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:param relpath: is a urlencoded string.
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remote_path = self._parsed_url.clone(relpath).path
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# the initial slash should be removed from the path, and treated as a
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# homedir relative path (the path begins with a double slash if it is
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# absolute). see draft-ietf-secsh-scp-sftp-ssh-uri-03.txt
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# RBC 20060118 we are not using this as its too user hostile. instead
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# we are following lftp and using /~/foo to mean '~/foo'
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# vila--20070602 and leave absolute paths begin with a single slash.
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if remote_path.startswith('/~/'):
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remote_path = remote_path[3:]
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elif remote_path == '/~':
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def _create_connection(self, credentials=None):
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"""Create a new connection with the provided credentials.
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:param credentials: The credentials needed to establish the connection.
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:return: The created connection and its associated credentials.
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The credentials are only the password as it may have been entered
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interactively by the user and may be different from the one provided
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in base url at transport creation time.
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if credentials is None:
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password = self._parsed_url.password
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password = credentials
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vendor = ssh._get_ssh_vendor()
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user = self._parsed_url.user
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auth = config.AuthenticationConfig()
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user = auth.get_user('ssh', self._parsed_url.host,
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self._parsed_url.port)
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connection = vendor.connect_sftp(self._parsed_url.user, password,
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self._parsed_url.host, self._parsed_url.port)
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return connection, (user, password)
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def disconnect(self):
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connection = self._get_connection()
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if connection is not None:
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"""Ensures that a connection is established"""
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connection = self._get_connection()
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if connection is None:
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# First connection ever
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connection, credentials = self._create_connection()
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self._set_connection(connection, credentials)
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def has(self, relpath):
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Does the target location exist?
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self._get_sftp().stat(self._remote_path(relpath))
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# stat result is about 20 bytes, let's say
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self._report_activity(20, 'read')
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def get(self, relpath):
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"""Get the file at the given relative path.
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:param relpath: The relative path to the file
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path = self._remote_path(relpath)
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f = self._get_sftp().file(path, mode='rb')
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size = f.stat().st_size
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if getattr(f, 'prefetch', None) is not None:
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except (IOError, paramiko.SSHException) as e:
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self._translate_io_exception(e, path, ': error retrieving',
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failure_exc=errors.ReadError)
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def get_bytes(self, relpath):
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# reimplement this here so that we can report how many bytes came back
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with self.get(relpath) as f:
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self._report_activity(len(bytes), 'read')
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def _readv(self, relpath, offsets):
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"""See Transport.readv()"""
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# We overload the default readv() because we want to use a file
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# that does not have prefetch enabled.
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# Also, if we have a new paramiko, it implements an async readv()
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path = self._remote_path(relpath)
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fp = self._get_sftp().file(path, mode='rb')
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readv = getattr(fp, 'readv', None)
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return self._sftp_readv(fp, offsets, relpath)
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if 'sftp' in debug.debug_flags:
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mutter('seek and read %s offsets', len(offsets))
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return self._seek_and_read(fp, offsets, relpath)
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except (IOError, paramiko.SSHException) as e:
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self._translate_io_exception(e, path, ': error retrieving')
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def recommended_page_size(self):
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"""See Transport.recommended_page_size().
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For SFTP we suggest a large page size to reduce the overhead
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introduced by latency.
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def _sftp_readv(self, fp, offsets, relpath):
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"""Use the readv() member of fp to do async readv.
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Then read them using paramiko.readv(). paramiko.readv()
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does not support ranges > 64K, so it caps the request size, and
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just reads until it gets all the stuff it wants.
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helper = _SFTPReadvHelper(offsets, relpath, self._report_activity)
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return helper.request_and_yield_offsets(fp)
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def put_file(self, relpath, f, mode=None):
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Copy the file-like object into the location.
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:param relpath: Location to put the contents, relative to base.
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:param f: File-like object.
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:param mode: The final mode for the file
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final_path = self._remote_path(relpath)
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return self._put(final_path, f, mode=mode)
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def _put(self, abspath, f, mode=None):
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"""Helper function so both put() and copy_abspaths can reuse the code"""
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tmp_abspath = '%s.tmp.%.9f.%d.%d' % (abspath, time.time(),
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os.getpid(), random.randint(0, 0x7FFFFFFF))
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fout = self._sftp_open_exclusive(tmp_abspath, mode=mode)
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fout.set_pipelined(True)
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length = self._pump(f, fout)
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except (IOError, paramiko.SSHException) as e:
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self._translate_io_exception(e, tmp_abspath)
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# XXX: This doesn't truly help like we would like it to.
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# The problem is that openssh strips sticky bits. So while we
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# can properly set group write permission, we lose the group
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# sticky bit. So it is probably best to stop chmodding, and
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# just tell users that they need to set the umask correctly.
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# The attr.st_mode = mode, in _sftp_open_exclusive
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# will handle when the user wants the final mode to be more
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# restrictive. And then we avoid a round trip. Unless
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# paramiko decides to expose an async chmod()
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# This is designed to chmod() right before we close.
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# Because we set_pipelined() earlier, theoretically we might
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# avoid the round trip for fout.close()
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self._get_sftp().chmod(tmp_abspath, mode)
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self._rename_and_overwrite(tmp_abspath, abspath)
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except Exception as e:
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# If we fail, try to clean up the temporary file
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# before we throw the exception
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# but don't let another exception mess things up
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# Write out the traceback, because otherwise
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# the catch and throw destroys it
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mutter(traceback.format_exc())
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self._get_sftp().remove(tmp_abspath)
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# raise the saved except
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# raise the original with its traceback if we can.
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def _put_non_atomic_helper(self, relpath, writer, mode=None,
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create_parent_dir=False,
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abspath = self._remote_path(relpath)
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# TODO: jam 20060816 paramiko doesn't publicly expose a way to
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# set the file mode at create time. If it does, use it.
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# But for now, we just chmod later anyway.
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def _open_and_write_file():
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"""Try to open the target file, raise error on failure"""
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fout = self._get_sftp().file(abspath, mode='wb')
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fout.set_pipelined(True)
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except (paramiko.SSHException, IOError) as e:
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self._translate_io_exception(e, abspath,
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# This is designed to chmod() right before we close.
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# Because we set_pipelined() earlier, theoretically we might
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# avoid the round trip for fout.close()
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self._get_sftp().chmod(abspath, mode)
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if not create_parent_dir:
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_open_and_write_file()
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# Try error handling to create the parent directory if we need to
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_open_and_write_file()
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# Try to create the parent directory, and then go back to
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parent_dir = os.path.dirname(abspath)
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self._mkdir(parent_dir, dir_mode)
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_open_and_write_file()
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def put_file_non_atomic(self, relpath, f, mode=None,
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create_parent_dir=False,
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"""Copy the file-like object into the target location.
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This function is not strictly safe to use. It is only meant to
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be used when you already know that the target does not exist.
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It is not safe, because it will open and truncate the remote
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file. So there may be a time when the file has invalid contents.
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:param relpath: The remote location to put the contents.
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:param f: File-like object.
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:param mode: Possible access permissions for new file.
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None means do not set remote permissions.
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:param create_parent_dir: If we cannot create the target file because
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the parent directory does not exist, go ahead and
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create it, and then try again.
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self._put_non_atomic_helper(relpath, writer, mode=mode,
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create_parent_dir=create_parent_dir,
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def put_bytes_non_atomic(self, relpath, raw_bytes, mode=None,
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create_parent_dir=False,
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if not isinstance(raw_bytes, bytes):
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'raw_bytes must be a plain string, not %s' % type(raw_bytes))
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fout.write(raw_bytes)
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self._put_non_atomic_helper(relpath, writer, mode=mode,
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create_parent_dir=create_parent_dir,
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def iter_files_recursive(self):
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"""Walk the relative paths of all files in this transport."""
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# progress is handled by list_dir
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queue = list(self.list_dir('.'))
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relpath = queue.pop(0)
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st = self.stat(relpath)
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if stat.S_ISDIR(st.st_mode):
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for i, basename in enumerate(self.list_dir(relpath)):
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queue.insert(i, relpath + '/' + basename)
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def _mkdir(self, abspath, mode=None):
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self._report_activity(len(abspath), 'write')
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self._get_sftp().mkdir(abspath, local_mode)
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self._report_activity(1, 'read')
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# chmod a dir through sftp will erase any sgid bit set
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# on the server side. So, if the bit mode are already
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# set, avoid the chmod. If the mode is not fine but
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# the sgid bit is set, report a warning to the user
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# with the umask fix.
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stat = self._get_sftp().lstat(abspath)
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mode = mode & 0o777 # can't set special bits anyway
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if mode != stat.st_mode & 0o777:
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if stat.st_mode & 0o6000:
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warning('About to chmod %s over sftp, which will result'
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' in its suid or sgid bits being cleared. If'
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' you want to preserve those bits, change your '
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' environment on the server to use umask 0%03o.'
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% (abspath, 0o777 - mode))
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self._get_sftp().chmod(abspath, mode=mode)
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except (paramiko.SSHException, IOError) as e:
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self._translate_io_exception(e, abspath, ': unable to mkdir',
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failure_exc=FileExists)
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def mkdir(self, relpath, mode=None):
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"""Create a directory at the given path."""
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self._mkdir(self._remote_path(relpath), mode=mode)
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def open_write_stream(self, relpath, mode=None):
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"""See Transport.open_write_stream."""
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# initialise the file to zero-length
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# this is three round trips, but we don't use this
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# api more than once per write_group at the moment so
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# it is a tolerable overhead. Better would be to truncate
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# the file after opening. RBC 20070805
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self.put_bytes_non_atomic(relpath, b"", mode)
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abspath = self._remote_path(relpath)
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# TODO: jam 20060816 paramiko doesn't publicly expose a way to
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# set the file mode at create time. If it does, use it.
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# But for now, we just chmod later anyway.
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handle = self._get_sftp().file(abspath, mode='wb')
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handle.set_pipelined(True)
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except (paramiko.SSHException, IOError) as e:
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self._translate_io_exception(e, abspath,
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_file_streams[self.abspath(relpath)] = handle
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return FileFileStream(self, relpath, handle)
715
def _translate_io_exception(self, e, path, more_info='',
716
failure_exc=PathError):
717
"""Translate a paramiko or IOError into a friendlier exception.
719
:param e: The original exception
720
:param path: The path in question when the error is raised
721
:param more_info: Extra information that can be included,
722
such as what was going on
723
:param failure_exc: Paramiko has the super fun ability to raise completely
724
opaque errors that just set "e.args = ('Failure',)" with
726
If this parameter is set, it defines the exception
727
to raise in these cases.
729
# paramiko seems to generate detailless errors.
730
self._translate_error(e, path, raise_generic=False)
731
if getattr(e, 'args', None) is not None:
732
if (e.args == ('No such file or directory',) or
733
e.args == ('No such file',)):
734
raise NoSuchFile(path, str(e) + more_info)
735
if (e.args == ('mkdir failed',) or
736
e.args[0].startswith('syserr: File exists')):
737
raise FileExists(path, str(e) + more_info)
738
# strange but true, for the paramiko server.
739
if (e.args == ('Failure',)):
740
raise failure_exc(path, str(e) + more_info)
741
# Can be something like args = ('Directory not empty:
742
# '/srv/bazaar.launchpad.net/blah...: '
743
# [Errno 39] Directory not empty',)
744
if (e.args[0].startswith('Directory not empty: ')
745
or getattr(e, 'errno', None) == errno.ENOTEMPTY):
746
raise errors.DirectoryNotEmpty(path, str(e))
747
if e.args == ('Operation unsupported',):
748
raise errors.TransportNotPossible()
749
mutter('Raising exception with args %s', e.args)
750
if getattr(e, 'errno', None) is not None:
751
mutter('Raising exception with errno %s', e.errno)
754
def append_file(self, relpath, f, mode=None):
756
Append the text in the file-like object into the final
760
path = self._remote_path(relpath)
761
fout = self._get_sftp().file(path, 'ab')
763
self._get_sftp().chmod(path, mode)
767
except (IOError, paramiko.SSHException) as e:
768
self._translate_io_exception(e, relpath, ': unable to append')
770
def rename(self, rel_from, rel_to):
771
"""Rename without special overwriting"""
773
self._get_sftp().rename(self._remote_path(rel_from),
774
self._remote_path(rel_to))
775
except (IOError, paramiko.SSHException) as e:
776
self._translate_io_exception(e, rel_from,
777
': unable to rename to %r' % (rel_to))
779
def _rename_and_overwrite(self, abs_from, abs_to):
780
"""Do a fancy rename on the remote server.
782
Using the implementation provided by osutils.
785
sftp = self._get_sftp()
786
fancy_rename(abs_from, abs_to,
787
rename_func=sftp.rename,
788
unlink_func=sftp.remove)
789
except (IOError, paramiko.SSHException) as e:
790
self._translate_io_exception(e, abs_from,
791
': unable to rename to %r' % (abs_to))
793
def move(self, rel_from, rel_to):
794
"""Move the item at rel_from to the location at rel_to"""
795
path_from = self._remote_path(rel_from)
796
path_to = self._remote_path(rel_to)
797
self._rename_and_overwrite(path_from, path_to)
799
def delete(self, relpath):
800
"""Delete the item at relpath"""
801
path = self._remote_path(relpath)
803
self._get_sftp().remove(path)
804
except (IOError, paramiko.SSHException) as e:
805
self._translate_io_exception(e, path, ': unable to delete')
807
def external_url(self):
808
"""See breezy.transport.Transport.external_url."""
809
# the external path for SFTP is the base
813
"""Return True if this store supports listing."""
816
def list_dir(self, relpath):
818
Return a list of all files at the given location.
820
# does anything actually use this?
822
# This is at least used by copy_tree for remote upgrades.
823
# -- David Allouche 2006-08-11
824
path = self._remote_path(relpath)
826
entries = self._get_sftp().listdir(path)
827
self._report_activity(sum(map(len, entries)), 'read')
828
except (IOError, paramiko.SSHException) as e:
829
self._translate_io_exception(e, path, ': failed to list_dir')
830
return [urlutils.escape(entry) for entry in entries]
832
def rmdir(self, relpath):
833
"""See Transport.rmdir."""
834
path = self._remote_path(relpath)
836
return self._get_sftp().rmdir(path)
837
except (IOError, paramiko.SSHException) as e:
838
self._translate_io_exception(e, path, ': failed to rmdir')
840
def stat(self, relpath):
841
"""Return the stat information for a file."""
842
path = self._remote_path(relpath)
844
return self._get_sftp().lstat(path)
845
except (IOError, paramiko.SSHException) as e:
846
self._translate_io_exception(e, path, ': unable to stat')
848
def readlink(self, relpath):
849
"""See Transport.readlink."""
850
path = self._remote_path(relpath)
852
return self._get_sftp().readlink(self._remote_path(path))
853
except (IOError, paramiko.SSHException) as e:
854
self._translate_io_exception(e, path, ': unable to readlink')
856
def symlink(self, source, link_name):
857
"""See Transport.symlink."""
859
conn = self._get_sftp()
860
sftp_retval = conn.symlink(source, self._remote_path(link_name))
861
except (IOError, paramiko.SSHException) as e:
862
self._translate_io_exception(e, link_name,
863
': unable to create symlink to %r' % (source))
865
def lock_read(self, relpath):
867
Lock the given file for shared (read) access.
868
:return: A lock object, which has an unlock() member function
870
# FIXME: there should be something clever i can do here...
871
class BogusLock(object):
872
def __init__(self, path):
878
def __exit__(self, exc_type, exc_val, exc_tb):
883
return BogusLock(relpath)
885
def lock_write(self, relpath):
887
Lock the given file for exclusive (write) access.
888
WARNING: many transports do not support this, so trying avoid using it
890
:return: A lock object, which has an unlock() member function
892
# This is a little bit bogus, but basically, we create a file
893
# which should not already exist, and if it does, we assume
894
# that there is a lock, and if it doesn't, the we assume
895
# that we have taken the lock.
896
return SFTPLock(relpath, self)
898
def _sftp_open_exclusive(self, abspath, mode=None):
899
"""Open a remote path exclusively.
901
SFTP supports O_EXCL (SFTP_FLAG_EXCL), which fails if
902
the file already exists. However it does not expose this
903
at the higher level of SFTPClient.open(), so we have to
906
WARNING: This breaks the SFTPClient abstraction, so it
907
could easily break against an updated version of paramiko.
909
:param abspath: The remote absolute path where the file should be opened
910
:param mode: The mode permissions bits for the new file
912
# TODO: jam 20060816 Paramiko >= 1.6.2 (probably earlier) supports
913
# using the 'x' flag to indicate SFTP_FLAG_EXCL.
914
# However, there is no way to set the permission mode at open
915
# time using the sftp_client.file() functionality.
916
path = self._get_sftp()._adjust_cwd(abspath)
917
# mutter('sftp abspath %s => %s', abspath, path)
918
attr = SFTPAttributes()
921
omode = (SFTP_FLAG_WRITE | SFTP_FLAG_CREATE
922
| SFTP_FLAG_TRUNC | SFTP_FLAG_EXCL)
924
t, msg = self._get_sftp()._request(CMD_OPEN, path, omode, attr)
926
raise TransportError('Expected an SFTP handle')
927
handle = msg.get_string()
928
return SFTPFile(self._get_sftp(), handle, 'wb', -1)
929
except (paramiko.SSHException, IOError) as e:
930
self._translate_io_exception(e, abspath, ': unable to open',
931
failure_exc=FileExists)
933
def _can_roundtrip_unix_modebits(self):
934
if sys.platform == 'win32':
941
def get_test_permutations():
942
"""Return the permutations to be used in testing."""
943
from ..tests import stub_sftp
944
return [(SFTPTransport, stub_sftp.SFTPAbsoluteServer),
945
(SFTPTransport, stub_sftp.SFTPHomeDirServer),
946
(SFTPTransport, stub_sftp.SFTPSiblingAbsoluteServer),
added
removed
breezy/transport/sftp.py
