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# Copyright (C) 2005-2011, 2016, 2017 Canonical Ltd
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# Copyright (C) 2005 Robey Pointer <robey@lag.net>, 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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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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from bzrlib.errors import (FileExists,
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TransportNotPossible, NoSuchFile, NonRelativePath,
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from bzrlib.config import config_dir
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from bzrlib.trace import mutter, warning, error
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from bzrlib.transport import Transport, register_transport
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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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except ImportError:
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error('The SFTP transport requires paramiko.')
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Load system host keys (probably doesn't work on windows) and any
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"discovered" keys from previous sessions.
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global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
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SYSTEM_HOSTKEYS = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
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mutter('failed to load system host keys: ' + str(e))
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bzr_hostkey_path = os.path.join(config_dir(), 'ssh_host_keys')
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BZR_HOSTKEYS = paramiko.util.load_host_keys(bzr_hostkey_path)
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mutter('failed to load bzr host keys: ' + str(e))
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Save "discovered" host keys in $(config)/ssh_host_keys/.
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global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
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bzr_hostkey_path = os.path.join(config_dir(), 'ssh_host_keys')
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if not os.path.isdir(config_dir()):
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os.mkdir(config_dir())
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f = open(bzr_hostkey_path, 'w')
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f.write('# SSH host keys collected by bzr\n')
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for hostname, keys in BZR_HOSTKEYS.iteritems():
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for keytype, key in keys.iteritems():
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f.write('%s %s %s\n' % (hostname, keytype, key.get_base64()))
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mutter('failed to save bzr host keys: ' + str(e))
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class SFTPTransportError (TransportError):
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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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class SFTPTransport (Transport):
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Transport implementation for SFTP access.
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_url_matcher = re.compile(r'^sftp://([^:@]*(:[^@]*)?@)?(.*?)(:\d+)?(/.*)?$')
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def __init__(self, base, clone_from=None):
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assert base.startswith('sftp://')
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super(SFTPTransport, self).__init__(base)
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if clone_from is None:
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# use the same ssh connection, etc
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self._sftp = clone_from._sftp
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# super saves 'self.base'
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def should_cache(self):
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Return True if the data pulled across should be cached locally.
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def clone(self, offset=None):
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Return a new SFTPTransport with root at self.base + offset.
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We share the same SFTP session between such transports, because it's
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fairly expensive to set them up.
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return SFTPTransport(self.base, self)
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return SFTPTransport(self.abspath(offset), self)
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def abspath(self, relpath):
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Return the full url to the given relative path.
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@param relpath: the relative path or path components
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@type relpath: str or list
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return self._unparse_url(self._abspath(relpath))
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def _abspath(self, relpath):
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"""Return the absolute path segment without the SFTP URL."""
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# FIXME: share the common code across transports
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assert isinstance(relpath, basestring)
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relpath = [urllib.unquote(relpath)]
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basepath = self._path.split('/')
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if len(basepath) > 0 and basepath[-1] == '':
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basepath = basepath[:-1]
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if len(basepath) == 0:
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# In most filesystems, a request for the parent
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# of root, just returns root.
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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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path = '/'.join(basepath)
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if len(path) and path[0] != '/':
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def relpath(self, abspath):
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# FIXME: this is identical to HttpTransport -- share it
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if not abspath.startswith(self.base):
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raise NonRelativePath('path %r is not under base URL %r'
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% (abspath, self.base))
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return abspath[pl:].lstrip('/')
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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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self._sftp.stat(self._abspath(relpath))
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def get(self, relpath):
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"""Get the file at the given relative path.
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def get(self, relpath, decode=False):
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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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path = self._abspath(relpath)
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return self._sftp.file(path)
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except (IOError, paramiko.SSHException), x:
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raise NoSuchFile('Error retrieving %s: %s' % (path, str(x)), x)
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def get_partial(self, relpath, start, length=None):
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Get just part of a file.
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:param relpath: Path to the file, relative to base
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:param start: The starting position to read from
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:param length: The length to read. A length of None indicates
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read to the end of the file.
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:return: A file-like object containing at least the specified bytes.
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Some implementations may return objects which can be read
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past this length, but this is not guaranteed.
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f = self.get(relpath)
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def put(self, relpath, f):
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Copy the file-like or string 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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:param f: File-like or string object.
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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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# FIXME: should do something atomic or locking here, this is unsafe
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path = self._abspath(relpath)
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fout = self._sftp.file(path, 'wb')
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self._translate_io_exception(e, relpath)
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except (IOError, paramiko.SSHException), x:
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raise SFTPTransportError('Unable to write file %r' % (path,), x)
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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
563
# raise the original with its traceback if we can.
566
def _put_non_atomic_helper(self, relpath, writer, mode=None,
567
create_parent_dir=False,
569
abspath = self._remote_path(relpath)
571
# TODO: jam 20060816 paramiko doesn't publicly expose a way to
572
# set the file mode at create time. If it does, use it.
573
# But for now, we just chmod later anyway.
575
def _open_and_write_file():
576
"""Try to open the target file, raise error on failure"""
580
fout = self._get_sftp().file(abspath, mode='wb')
581
fout.set_pipelined(True)
583
except (paramiko.SSHException, IOError) as e:
584
self._translate_io_exception(e, abspath,
587
# This is designed to chmod() right before we close.
588
# Because we set_pipelined() earlier, theoretically we might
589
# avoid the round trip for fout.close()
591
self._get_sftp().chmod(abspath, mode)
596
if not create_parent_dir:
597
_open_and_write_file()
600
# Try error handling to create the parent directory if we need to
602
_open_and_write_file()
604
# Try to create the parent directory, and then go back to
606
parent_dir = os.path.dirname(abspath)
607
self._mkdir(parent_dir, dir_mode)
608
_open_and_write_file()
610
def put_file_non_atomic(self, relpath, f, mode=None,
611
create_parent_dir=False,
613
"""Copy the file-like object into the target location.
615
This function is not strictly safe to use. It is only meant to
616
be used when you already know that the target does not exist.
617
It is not safe, because it will open and truncate the remote
618
file. So there may be a time when the file has invalid contents.
620
:param relpath: The remote location to put the contents.
621
:param f: File-like object.
622
:param mode: Possible access permissions for new file.
623
None means do not set remote permissions.
624
:param create_parent_dir: If we cannot create the target file because
625
the parent directory does not exist, go ahead and
626
create it, and then try again.
630
self._put_non_atomic_helper(relpath, writer, mode=mode,
631
create_parent_dir=create_parent_dir,
634
def put_bytes_non_atomic(self, relpath, raw_bytes, mode=None,
635
create_parent_dir=False,
637
if not isinstance(raw_bytes, bytes):
639
'raw_bytes must be a plain string, not %s' % type(raw_bytes))
642
fout.write(raw_bytes)
643
self._put_non_atomic_helper(relpath, writer, mode=mode,
644
create_parent_dir=create_parent_dir,
647
221
def iter_files_recursive(self):
648
222
"""Walk the relative paths of all files in this transport."""
649
# progress is handled by list_dir
650
223
queue = list(self.list_dir('.'))
652
relpath = queue.pop(0)
225
relpath = urllib.quote(queue.pop(0))
653
226
st = self.stat(relpath)
654
227
if stat.S_ISDIR(st.st_mode):
655
228
for i, basename in enumerate(self.list_dir(relpath)):
656
queue.insert(i, relpath + '/' + basename)
229
queue.insert(i, relpath+'/'+basename)
660
def _mkdir(self, abspath, mode=None):
666
self._report_activity(len(abspath), 'write')
667
self._get_sftp().mkdir(abspath, local_mode)
668
self._report_activity(1, 'read')
670
# chmod a dir through sftp will erase any sgid bit set
671
# on the server side. So, if the bit mode are already
672
# set, avoid the chmod. If the mode is not fine but
673
# the sgid bit is set, report a warning to the user
674
# with the umask fix.
675
stat = self._get_sftp().lstat(abspath)
676
mode = mode & 0o777 # can't set special bits anyway
677
if mode != stat.st_mode & 0o777:
678
if stat.st_mode & 0o6000:
679
warning('About to chmod %s over sftp, which will result'
680
' in its suid or sgid bits being cleared. If'
681
' you want to preserve those bits, change your '
682
' environment on the server to use umask 0%03o.'
683
% (abspath, 0o777 - mode))
684
self._get_sftp().chmod(abspath, mode=mode)
685
except (paramiko.SSHException, IOError) as e:
686
self._translate_io_exception(e, abspath, ': unable to mkdir',
687
failure_exc=FileExists)
689
def mkdir(self, relpath, mode=None):
233
def mkdir(self, relpath):
690
234
"""Create a directory at the given path."""
691
self._mkdir(self._remote_path(relpath), mode=mode)
693
def open_write_stream(self, relpath, mode=None):
694
"""See Transport.open_write_stream."""
695
# initialise the file to zero-length
696
# this is three round trips, but we don't use this
697
# api more than once per write_group at the moment so
698
# it is a tolerable overhead. Better would be to truncate
699
# the file after opening. RBC 20070805
700
self.put_bytes_non_atomic(relpath, b"", mode)
701
abspath = self._remote_path(relpath)
702
# TODO: jam 20060816 paramiko doesn't publicly expose a way to
703
# set the file mode at create time. If it does, use it.
704
# But for now, we just chmod later anyway.
707
handle = self._get_sftp().file(abspath, mode='wb')
708
handle.set_pipelined(True)
709
except (paramiko.SSHException, IOError) as e:
710
self._translate_io_exception(e, abspath,
712
_file_streams[self.abspath(relpath)] = handle
713
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.
236
path = self._abspath(relpath)
237
self._sftp.mkdir(path)
239
self._translate_io_exception(e, relpath)
240
except (IOError, paramiko.SSHException), x:
241
raise SFTPTransportError('Unable to mkdir %r' % (path,), x)
243
def _translate_io_exception(self, e, relpath):
729
244
# 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)
245
if (e.errno == errno.ENOENT or
246
e.args == ('No such file or directory',) or
247
e.args == ('No such file',)):
248
raise NoSuchFile(relpath)
249
if (e.args == ('mkdir failed',)):
250
raise FileExists(relpath)
251
# strange but true, for the paramiko server.
252
if (e.args == ('Failure',)):
253
raise FileExists(relpath)
754
def append_file(self, relpath, f, mode=None):
256
def append(self, relpath, f):
756
258
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)
262
path = self._abspath(relpath)
263
fout = self._sftp.file(path, 'ab')
765
264
self._pump(f, fout)
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))
265
except (IOError, paramiko.SSHException), x:
266
raise SFTPTransportError('Unable to append file %r' % (path,), x)
268
def copy(self, rel_from, rel_to):
269
"""Copy the item at rel_from to the location at rel_to"""
270
path_from = self._abspath(rel_from)
271
path_to = self._abspath(rel_to)
273
fin = self._sftp.file(path_from, 'rb')
275
fout = self._sftp.file(path_to, 'wb')
277
fout.set_pipelined(True)
278
self._pump(fin, fout)
283
except (IOError, paramiko.SSHException), x:
284
raise SFTPTransportError('Unable to copy %r to %r' % (path_from, path_to), x)
793
286
def move(self, rel_from, rel_to):
794
287
"""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)
288
path_from = self._abspath(rel_from)
289
path_to = self._abspath(rel_to)
291
self._sftp.rename(path_from, path_to)
292
except (IOError, paramiko.SSHException), x:
293
raise SFTPTransportError('Unable to move %r to %r' % (path_from, path_to), x)
799
295
def delete(self, relpath):
800
296
"""Delete the item at relpath"""
801
path = self._remote_path(relpath)
297
path = self._abspath(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
299
self._sftp.remove(path)
300
except (IOError, paramiko.SSHException), x:
301
raise SFTPTransportError('Unable to delete %r' % (path,), x)
812
303
def listable(self):
813
304
"""Return True if this store supports listing."""
887
341
Lock the given file for exclusive (write) access.
888
342
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':
344
:return: A lock object, which should be passed to Transport.unlock()
346
# FIXME: there should be something clever i can do here...
347
class BogusLock(object):
348
def __init__(self, path):
352
return BogusLock(relpath)
355
def _unparse_url(self, path=None):
359
return 'sftp://%s@%s%s' % (self._username, self._host, path)
360
return 'sftp://%s@%s:%d%s' % (self._username, self._host, self._port, path)
362
def _parse_url(self, url):
363
assert url[:7] == 'sftp://'
364
m = self._url_matcher.match(url)
366
raise SFTPTransportError('Unable to parse SFTP URL %r' % (url,))
367
self._username, self._password, self._host, self._port, self._path = m.groups()
368
if self._username is None:
369
self._username = getpass.getuser()
371
self._username = self._username[:-1]
373
self._password = self._password[1:]
374
self._username = self._username[len(self._password)+1:]
375
if self._port is None:
378
self._port = int(self._port[1:])
379
if (self._path is None) or (self._path == ''):
382
def _sftp_connect(self):
383
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
388
t = paramiko.Transport((self._host, self._port))
390
except paramiko.SSHException:
391
raise SFTPTransportError('Unable to reach SSH host %s:%d' % (self._host, self._port))
393
server_key = t.get_remote_server_key()
394
server_key_hex = paramiko.util.hexify(server_key.get_fingerprint())
395
keytype = server_key.get_name()
396
if SYSTEM_HOSTKEYS.has_key(self._host) and SYSTEM_HOSTKEYS[self._host].has_key(keytype):
397
our_server_key = SYSTEM_HOSTKEYS[self._host][keytype]
398
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
399
elif BZR_HOSTKEYS.has_key(self._host) and BZR_HOSTKEYS[self._host].has_key(keytype):
400
our_server_key = BZR_HOSTKEYS[self._host][keytype]
401
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
403
warning('Adding %s host key for %s: %s' % (keytype, self._host, server_key_hex))
404
if not BZR_HOSTKEYS.has_key(self._host):
405
BZR_HOSTKEYS[self._host] = {}
406
BZR_HOSTKEYS[self._host][keytype] = server_key
407
our_server_key = server_key
408
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
410
if server_key != our_server_key:
411
filename1 = os.path.expanduser('~/.ssh/known_hosts')
412
filename2 = os.path.join(config_dir(), 'ssh_host_keys')
413
raise SFTPTransportError('Host keys for %s do not match! %s != %s' % \
414
(self._host, our_server_key_hex, server_key_hex),
415
['Try editing %s or %s' % (filename1, filename2)])
417
self._sftp_auth(t, self._username, self._host)
420
self._sftp = t.open_sftp_client()
421
except paramiko.SSHException:
422
raise BzrError('Unable to find path %s on SFTP server %s' % \
423
(self._path, self._host))
425
def _sftp_auth(self, transport, username, host):
426
agent = paramiko.Agent()
427
for key in agent.get_keys():
428
mutter('Trying SSH agent key %s' % paramiko.util.hexify(key.get_fingerprint()))
430
transport.auth_publickey(self._username, key)
432
except paramiko.SSHException, e:
435
# okay, try finding id_rsa or id_dss? (posix only)
436
if self._try_pkey_auth(transport, paramiko.RSAKey, 'id_rsa'):
438
if self._try_pkey_auth(transport, paramiko.DSSKey, 'id_dsa'):
443
transport.auth_password(self._username, self._password)
445
except paramiko.SSHException, e:
448
# give up and ask for a password
449
password = getpass.getpass('SSH %s@%s password: ' % (self._username, self._host))
451
transport.auth_password(self._username, password)
452
except paramiko.SSHException:
453
raise SFTPTransportError('Unable to authenticate to SSH host as %s@%s' % \
454
(self._username, self._host))
456
def _try_pkey_auth(self, transport, pkey_class, filename):
457
filename = os.path.expanduser('~/.ssh/' + filename)
459
key = pkey_class.from_private_key_file(filename)
460
transport.auth_publickey(self._username, key)
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),
462
except paramiko.PasswordRequiredException:
463
password = getpass.getpass('SSH %s password: ' % (os.path.basename(filename),))
465
key = pkey_class.from_private_key_file(filename, password)
466
transport.auth_publickey(self._username, key)
468
except paramiko.SSHException:
469
mutter('SSH authentication via %s key failed.' % (os.path.basename(filename),))
470
except paramiko.SSHException:
471
mutter('SSH authentication via %s key failed.' % (os.path.basename(filename),))
added
removed
bzrlib/transport/sftp.py
