1
# Copyright (C) 2005, 2006, 2007 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16
"""Implementation of Transport over ftp.
18
Written by Daniel Silverstone <dsilvers@digital-scurf.org> with serious
19
cargo-culting from the sftp transport and the http transport.
21
It provides the ftp:// and aftp:// protocols where ftp:// is passive ftp
22
and aftp:// is active ftp. Most people will want passive ftp for traversing
23
NAT and other firewalls, so it's best to use it unless you explicitly want
24
active, in which case aftp:// will be your friend.
27
from cStringIO import StringIO
38
from warnings import warn
46
from bzrlib.trace import mutter, warning
47
from bzrlib.transport import (
48
AppendBasedFileStream,
51
register_urlparse_netloc_protocol,
54
from bzrlib.transport.local import LocalURLServer
58
register_urlparse_netloc_protocol('aftp')
61
class FtpPathError(errors.PathError):
62
"""FTP failed for path: %(path)s%(extra)s"""
65
class FtpStatResult(object):
66
def __init__(self, f, relpath):
68
self.st_size = f.size(relpath)
69
self.st_mode = stat.S_IFREG
70
except ftplib.error_perm:
74
self.st_mode = stat.S_IFDIR
79
_number_of_retries = 2
80
_sleep_between_retries = 5
82
# FIXME: there are inconsistencies in the way temporary errors are
83
# handled. Sometimes we reconnect, sometimes we raise an exception. Care should
84
# be taken to analyze the implications for write operations (read operations
85
# are safe to retry). Overall even some read operations are never
86
# retried. --vila 20070720 (Bug #127164)
87
class FtpTransport(ConnectedTransport):
88
"""This is the transport agent for ftp:// access."""
90
def __init__(self, base, _from_transport=None):
91
"""Set the base path where files will be stored."""
92
if not (base.startswith('ftp://') or base.startswith('aftp://')):
93
raise ValueError(base)
94
super(FtpTransport, self).__init__(base,
95
_from_transport=_from_transport)
96
self._unqualified_scheme = 'ftp'
97
if self._scheme == 'aftp':
100
self.is_active = False
103
"""Return the ftplib.FTP instance for this object."""
104
# Ensures that a connection is established
105
connection = self._get_connection()
106
if connection is None:
107
# First connection ever
108
connection, credentials = self._create_connection()
109
self._set_connection(connection, credentials)
112
def _create_connection(self, credentials=None):
113
"""Create a new connection with the provided credentials.
115
:param credentials: The credentials needed to establish the connection.
117
:return: The created connection and its associated credentials.
119
The credentials are only the password as it may have been entered
120
interactively by the user and may be different from the one provided
121
in base url at transport creation time.
123
if credentials is None:
124
user, password = self._user, self._password
126
user, password = credentials
128
auth = config.AuthenticationConfig()
130
user = auth.get_user('ftp', self._host, port=self._port)
132
# Default to local user
133
user = getpass.getuser()
135
mutter("Constructing FTP instance against %r" %
136
((self._host, self._port, user, '********',
139
connection = ftplib.FTP()
140
connection.connect(host=self._host, port=self._port)
141
if user and user != 'anonymous' and \
142
password is None: # '' is a valid password
143
password = auth.get_password('ftp', self._host, user,
145
connection.login(user=user, passwd=password)
146
connection.set_pasv(not self.is_active)
147
except socket.error, e:
148
raise errors.SocketConnectionError(self._host, self._port,
149
msg='Unable to connect to',
151
except ftplib.error_perm, e:
152
raise errors.TransportError(msg="Error setting up connection:"
153
" %s" % str(e), orig_error=e)
154
return connection, (user, password)
156
def _reconnect(self):
157
"""Create a new connection with the previously used credentials"""
158
credentials = self._get_credentials()
159
connection, credentials = self._create_connection(credentials)
160
self._set_connection(connection, credentials)
162
def _translate_perm_error(self, err, path, extra=None,
163
unknown_exc=FtpPathError):
164
"""Try to translate an ftplib.error_perm exception.
166
:param err: The error to translate into a bzr error
167
:param path: The path which had problems
168
:param extra: Extra information which can be included
169
:param unknown_exc: If None, we will just raise the original exception
170
otherwise we raise unknown_exc(path, extra=extra)
176
extra += ': ' + str(err)
177
if ('no such file' in s
178
or 'could not open' in s
179
or 'no such dir' in s
180
or 'could not create file' in s # vsftpd
181
or 'file doesn\'t exist' in s
182
or 'rnfr command failed.' in s # vsftpd RNFR reply if file not found
183
or 'file/directory not found' in s # filezilla server
184
# Microsoft FTP-Service RNFR reply if file not found
185
or (s.startswith('550 ') and 'unable to rename to' in extra)
187
raise errors.NoSuchFile(path, extra=extra)
188
if ('file exists' in s):
189
raise errors.FileExists(path, extra=extra)
190
if ('not a directory' in s):
191
raise errors.PathError(path, extra=extra)
193
mutter('unable to understand error for path: %s: %s', path, err)
196
raise unknown_exc(path, extra=extra)
197
# TODO: jam 20060516 Consider re-raising the error wrapped in
198
# something like TransportError, but this loses the traceback
199
# Also, 'sftp' has a generic 'Failure' mode, which we use failure_exc
200
# to handle. Consider doing something like that here.
201
#raise TransportError(msg='Error for path: %s' % (path,), orig_error=e)
204
def _remote_path(self, relpath):
205
# XXX: It seems that ftplib does not handle Unicode paths
206
# at the same time, medusa won't handle utf8 paths So if
207
# we .encode(utf8) here (see ConnectedTransport
208
# implementation), then we get a Server failure. while
209
# if we use str(), we get a UnicodeError, and the test
210
# suite just skips testing UnicodePaths.
211
relative = str(urlutils.unescape(relpath))
212
remote_path = self._combine_paths(self._path, relative)
215
def has(self, relpath):
216
"""Does the target location exist?"""
217
# FIXME jam 20060516 We *do* ask about directories in the test suite
218
# We don't seem to in the actual codebase
219
# XXX: I assume we're never asked has(dirname) and thus I use
220
# the FTP size command and assume that if it doesn't raise,
222
abspath = self._remote_path(relpath)
225
mutter('FTP has check: %s => %s', relpath, abspath)
227
mutter("FTP has: %s", abspath)
229
except ftplib.error_perm, e:
230
if ('is a directory' in str(e).lower()):
231
mutter("FTP has dir: %s: %s", abspath, e)
233
mutter("FTP has not: %s: %s", abspath, e)
236
def get(self, relpath, decode=False, retries=0):
237
"""Get the file at the given relative path.
239
:param relpath: The relative path to the file
240
:param retries: Number of retries after temporary failures so far
243
We're meant to return a file-like object which bzr will
244
then read from. For now we do this via the magic of StringIO
246
# TODO: decode should be deprecated
248
mutter("FTP get: %s", self._remote_path(relpath))
251
f.retrbinary('RETR '+self._remote_path(relpath), ret.write, 8192)
254
except ftplib.error_perm, e:
255
raise errors.NoSuchFile(self.abspath(relpath), extra=str(e))
256
except ftplib.error_temp, e:
257
if retries > _number_of_retries:
258
raise errors.TransportError(msg="FTP temporary error during GET %s. Aborting."
259
% self.abspath(relpath),
262
warning("FTP temporary error: %s. Retrying.", str(e))
264
return self.get(relpath, decode, retries+1)
266
if retries > _number_of_retries:
267
raise errors.TransportError("FTP control connection closed during GET %s."
268
% self.abspath(relpath),
271
warning("FTP control connection closed. Trying to reopen.")
272
time.sleep(_sleep_between_retries)
274
return self.get(relpath, decode, retries+1)
276
def put_file(self, relpath, fp, mode=None, retries=0):
277
"""Copy the file-like or string object into the location.
279
:param relpath: Location to put the contents, relative to base.
280
:param fp: File-like or string object.
281
:param retries: Number of retries after temporary failures so far
284
TODO: jam 20051215 ftp as a protocol seems to support chmod, but
287
abspath = self._remote_path(relpath)
288
tmp_abspath = '%s.tmp.%.9f.%d.%d' % (abspath, time.time(),
289
os.getpid(), random.randint(0,0x7FFFFFFF))
291
if getattr(fp, 'read', None) is None:
292
# hand in a string IO
296
# capture the byte count; .read() may be read only so
298
class byte_counter(object):
299
def __init__(self, fp):
301
self.counted_bytes = 0
302
def read(self, count):
303
result = self.fp.read(count)
304
self.counted_bytes += len(result)
306
fp = byte_counter(fp)
308
mutter("FTP put: %s", abspath)
311
f.storbinary('STOR '+tmp_abspath, fp)
312
self._rename_and_overwrite(tmp_abspath, abspath, f)
313
self._setmode(relpath, mode)
314
if bytes is not None:
317
return fp.counted_bytes
318
except (ftplib.error_temp,EOFError), e:
319
warning("Failure during ftp PUT. Deleting temporary file.")
321
f.delete(tmp_abspath)
323
warning("Failed to delete temporary file on the"
324
" server.\nFile: %s", tmp_abspath)
327
except ftplib.error_perm, e:
328
self._translate_perm_error(e, abspath, extra='could not store',
329
unknown_exc=errors.NoSuchFile)
330
except ftplib.error_temp, e:
331
if retries > _number_of_retries:
332
raise errors.TransportError("FTP temporary error during PUT %s. Aborting."
333
% self.abspath(relpath), orig_error=e)
335
warning("FTP temporary error: %s. Retrying.", str(e))
337
self.put_file(relpath, fp, mode, retries+1)
339
if retries > _number_of_retries:
340
raise errors.TransportError("FTP control connection closed during PUT %s."
341
% self.abspath(relpath), orig_error=e)
343
warning("FTP control connection closed. Trying to reopen.")
344
time.sleep(_sleep_between_retries)
346
self.put_file(relpath, fp, mode, retries+1)
348
def mkdir(self, relpath, mode=None):
349
"""Create a directory at the given path."""
350
abspath = self._remote_path(relpath)
352
mutter("FTP mkd: %s", abspath)
355
self._setmode(relpath, mode)
356
except ftplib.error_perm, e:
357
self._translate_perm_error(e, abspath,
358
unknown_exc=errors.FileExists)
360
def open_write_stream(self, relpath, mode=None):
361
"""See Transport.open_write_stream."""
362
self.put_bytes(relpath, "", mode)
363
result = AppendBasedFileStream(self, relpath)
364
_file_streams[self.abspath(relpath)] = result
367
def recommended_page_size(self):
368
"""See Transport.recommended_page_size().
370
For FTP we suggest a large page size to reduce the overhead
371
introduced by latency.
375
def rmdir(self, rel_path):
376
"""Delete the directory at rel_path"""
377
abspath = self._remote_path(rel_path)
379
mutter("FTP rmd: %s", abspath)
382
except ftplib.error_perm, e:
383
self._translate_perm_error(e, abspath, unknown_exc=errors.PathError)
385
def append_file(self, relpath, f, mode=None):
386
"""Append the text in the file-like object into the final
389
abspath = self._remote_path(relpath)
390
if self.has(relpath):
391
ftp = self._get_FTP()
392
result = ftp.size(abspath)
396
mutter("FTP appe to %s", abspath)
397
self._try_append(relpath, f.read(), mode)
401
def _try_append(self, relpath, text, mode=None, retries=0):
402
"""Try repeatedly to append the given text to the file at relpath.
404
This is a recursive function. On errors, it will be called until the
405
number of retries is exceeded.
408
abspath = self._remote_path(relpath)
409
mutter("FTP appe (try %d) to %s", retries, abspath)
410
ftp = self._get_FTP()
411
ftp.voidcmd("TYPE I")
412
cmd = "APPE %s" % abspath
413
conn = ftp.transfercmd(cmd)
416
self._setmode(relpath, mode)
418
except ftplib.error_perm, e:
419
self._translate_perm_error(e, abspath, extra='error appending',
420
unknown_exc=errors.NoSuchFile)
421
except ftplib.error_temp, e:
422
if retries > _number_of_retries:
423
raise errors.TransportError("FTP temporary error during APPEND %s." \
424
"Aborting." % abspath, orig_error=e)
426
warning("FTP temporary error: %s. Retrying.", str(e))
428
self._try_append(relpath, text, mode, retries+1)
430
def _setmode(self, relpath, mode):
431
"""Set permissions on a path.
433
Only set permissions if the FTP server supports the 'SITE CHMOD'
438
mutter("FTP site chmod: setting permissions to %s on %s",
439
str(mode), self._remote_path(relpath))
440
ftp = self._get_FTP()
441
cmd = "SITE CHMOD %s %s" % (oct(mode),
442
self._remote_path(relpath))
444
except ftplib.error_perm, e:
445
# Command probably not available on this server
446
warning("FTP Could not set permissions to %s on %s. %s",
447
str(mode), self._remote_path(relpath), str(e))
449
# TODO: jam 20060516 I believe ftp allows you to tell an ftp server
450
# to copy something to another machine. And you may be able
451
# to give it its own address as the 'to' location.
452
# So implement a fancier 'copy()'
454
def rename(self, rel_from, rel_to):
455
abs_from = self._remote_path(rel_from)
456
abs_to = self._remote_path(rel_to)
457
mutter("FTP rename: %s => %s", abs_from, abs_to)
459
return self._rename(abs_from, abs_to, f)
461
def _rename(self, abs_from, abs_to, f):
463
f.rename(abs_from, abs_to)
464
except ftplib.error_perm, e:
465
self._translate_perm_error(e, abs_from,
466
': unable to rename to %r' % (abs_to))
468
def move(self, rel_from, rel_to):
469
"""Move the item at rel_from to the location at rel_to"""
470
abs_from = self._remote_path(rel_from)
471
abs_to = self._remote_path(rel_to)
473
mutter("FTP mv: %s => %s", abs_from, abs_to)
475
self._rename_and_overwrite(abs_from, abs_to, f)
476
except ftplib.error_perm, e:
477
self._translate_perm_error(e, abs_from,
478
extra='unable to rename to %r' % (rel_to,),
479
unknown_exc=errors.PathError)
481
def _rename_and_overwrite(self, abs_from, abs_to, f):
482
"""Do a fancy rename on the remote server.
484
Using the implementation provided by osutils.
486
osutils.fancy_rename(abs_from, abs_to,
487
rename_func=lambda p1, p2: self._rename(p1, p2, f),
488
unlink_func=lambda p: self._delete(p, f))
490
def delete(self, relpath):
491
"""Delete the item at relpath"""
492
abspath = self._remote_path(relpath)
494
self._delete(abspath, f)
496
def _delete(self, abspath, f):
498
mutter("FTP rm: %s", abspath)
500
except ftplib.error_perm, e:
501
self._translate_perm_error(e, abspath, 'error deleting',
502
unknown_exc=errors.NoSuchFile)
504
def external_url(self):
505
"""See bzrlib.transport.Transport.external_url."""
506
# FTP URL's are externally usable.
510
"""See Transport.listable."""
513
def list_dir(self, relpath):
514
"""See Transport.list_dir."""
515
basepath = self._remote_path(relpath)
516
mutter("FTP nlst: %s", basepath)
519
paths = f.nlst(basepath)
520
except ftplib.error_perm, e:
521
self._translate_perm_error(e, relpath, extra='error with list_dir')
522
except ftplib.error_temp, e:
523
# xs4all's ftp server raises a 450 temp error when listing an empty
524
# directory. Check for that and just return an empty list in that
525
# case. See bug #215522
526
if str(e).lower().startswith('450 no files found'):
527
mutter('FTP Server returned "%s" for nlst.'
528
' Assuming it means empty directory',
532
# If FTP.nlst returns paths prefixed by relpath, strip 'em
533
if paths and paths[0].startswith(basepath):
534
entries = [path[len(basepath)+1:] for path in paths]
537
# Remove . and .. if present
538
return [urlutils.escape(entry) for entry in entries
539
if entry not in ('.', '..')]
541
def iter_files_recursive(self):
542
"""See Transport.iter_files_recursive.
544
This is cargo-culted from the SFTP transport"""
545
mutter("FTP iter_files_recursive")
546
queue = list(self.list_dir("."))
548
relpath = queue.pop(0)
549
st = self.stat(relpath)
550
if stat.S_ISDIR(st.st_mode):
551
for i, basename in enumerate(self.list_dir(relpath)):
552
queue.insert(i, relpath+"/"+basename)
556
def stat(self, relpath):
557
"""Return the stat information for a file."""
558
abspath = self._remote_path(relpath)
560
mutter("FTP stat: %s", abspath)
562
return FtpStatResult(f, abspath)
563
except ftplib.error_perm, e:
564
self._translate_perm_error(e, abspath, extra='error w/ stat')
566
def lock_read(self, relpath):
567
"""Lock the given file for shared (read) access.
568
:return: A lock object, which should be passed to Transport.unlock()
570
# The old RemoteBranch ignore lock for reading, so we will
571
# continue that tradition and return a bogus lock object.
572
class BogusLock(object):
573
def __init__(self, path):
577
return BogusLock(relpath)
579
def lock_write(self, relpath):
580
"""Lock the given file for exclusive (write) access.
581
WARNING: many transports do not support this, so trying avoid using it
583
:return: A lock object, which should be passed to Transport.unlock()
585
return self.lock_read(relpath)
588
def get_test_permutations():
589
"""Return the permutations to be used in testing."""
590
from bzrlib import tests
591
if tests.FTPServerFeature.available():
592
from bzrlib.tests import ftp_server
593
return [(FtpTransport, ftp_server.FTPServer)]
595
# Dummy server to have the test suite report the number of tests
596
# needing that feature. We raise UnavailableFeature from methods before
597
# the test server is being used. Doing so in the setUp method has bad
598
# side-effects (tearDown is never called).
599
class UnavailableFTPServer(object):
608
raise tests.UnavailableFeature(tests.FTPServerFeature)
610
def get_bogus_url(self):
611
raise tests.UnavailableFeature(tests.FTPServerFeature)
613
return [(FtpTransport, UnavailableFTPServer)]
added
removed
bzrlib/transport/ftp.py
