bzr commit over sftp fails

[Ian R. Williams]

On Ubuntu Edgy, with paramiko latest source and bzr 0.13rc1, when trying
to commit a change to another machine running Ubuntu Edgy over sftp:

bzr: ERROR: exceptions.AttributeError: 'SFTPSubprocess' object has no
attribute 'recv_ready'

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 626,
in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 588,
in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 292,
in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.4/site-packages/bzrlib/builtins.py", line 1874,
in run
    reporter=reporter)
  File "/usr/lib/python2.4/site-packages/bzrlib/decorators.py", line 51,
in write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/mutabletree.py", line
126, in commit
    revprops=revprops, *args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/commit.py", line 252, in
commit
    self._check_bound_branch()
  File "/usr/lib/python2.4/site-packages/bzrlib/commit.py", line 448, in
_check_bound_branch
    self.master_branch.lock_write()
  File "/usr/lib/python2.4/site-packages/bzrlib/branch.py", line 1039,
in lock_write
    self.repository.lock_write()
  File "/usr/lib/python2.4/site-packages/bzrlib/repository.py", line
228, in lock_write
    self.control_files.lock_write()
  File "/usr/lib/python2.4/site-packages/bzrlib/lockable_files.py", line
224, in lock_write
    self._lock.lock_write()
  File "/usr/lib/python2.4/site-packages/bzrlib/lockdir.py", line 417,
in lock_write
    self.wait_lock()
  File "/usr/lib/python2.4/site-packages/bzrlib/lockdir.py", line 384,
in wait_lock
    self.attempt_lock()
  File "/usr/lib/python2.4/site-packages/bzrlib/lockdir.py", line 217,
in attempt_lock
    info_bytes)
  File "/usr/lib/python2.4/site-packages/bzrlib/transport/sftp.py", line
653, in put_bytes_non_atomic
    dir_mode=dir_mode)
  File "/usr/lib/python2.4/site-packages/bzrlib/transport/sftp.py", line
609, in _put_non_atomic_helper
    _open_and_write_file()
  File "/usr/lib/python2.4/site-packages/bzrlib/transport/sftp.py", line
594, in _open_and_write_file
    writer(fout)
  File "/usr/lib/python2.4/site-packages/bzrlib/transport/sftp.py", line
650, in writer
    fout.write(bytes)
  File "/usr/lib/python2.4/site-packages/paramiko/file.py", line 314, in
write
    self._write_all(data)
  File "/usr/lib/python2.4/site-packages/paramiko/file.py", line 424, in
_write_all
    count = self._write(data)
  File "/usr/lib/python2.4/site-packages/paramiko/sftp_file.py", line
163, in _write
    if not self.pipelined or self.sftp.sock.recv_ready():
AttributeError: 'SFTPSubprocess' object has no attribute 'recv_ready'

bzr 0.13.0candidate1 on python 2.4.4.candidate.1 (linux2)
arguments: ['/usr/bin/bzr', 'commit', '-m', 'General tidy up and bug
fixes for initialization']