-
-
Notifications
You must be signed in to change notification settings - Fork 34.2k
Expand file tree
/
Copy pathtempfile.py
More file actions
640 lines (512 loc) · 19.1 KB
/
tempfile.py
File metadata and controls
640 lines (512 loc) · 19.1 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
"""Temporary files.
This module provides generic, low- and high-level interfaces for
creating temporary files and directories. All of the interfaces
provided by this module can be used without fear of race conditions
except for 'mktemp'. 'mktemp' is subject to race conditions and
should not be used; it is provided for backward compatibility only.
This module also provides some data items to the user:
TMP_MAX - maximum number of names that will be tried before
giving up.
template - the default prefix for all temporary names.
You may change this to control the default prefix.
tempdir - If this is set to a string before the first use of
any routine from this module, it will be considered as
another candidate location to store temporary files.
"""
__all__ = [
"NamedTemporaryFile", "TemporaryFile", # high level safe interfaces
"SpooledTemporaryFile",
"mkstemp", "mkdtemp", # low level safe interfaces
"mktemp", # deprecated unsafe interface
"TMP_MAX", "gettempprefix", # constants
"tempdir", "gettempdir"
]
# Imports.
import io as _io
import os as _os
import errno as _errno
from random import Random as _Random
try:
from cStringIO import StringIO as _StringIO
except ImportError:
from StringIO import StringIO as _StringIO
try:
import fcntl as _fcntl
except ImportError:
def _set_cloexec(fd):
pass
else:
def _set_cloexec(fd):
try:
flags = _fcntl.fcntl(fd, _fcntl.F_GETFD, 0)
except IOError:
pass
else:
# flags read successfully, modify
flags |= _fcntl.FD_CLOEXEC
_fcntl.fcntl(fd, _fcntl.F_SETFD, flags)
try:
import thread as _thread
except ImportError:
import dummy_thread as _thread
_allocate_lock = _thread.allocate_lock
_text_openflags = _os.O_RDWR | _os.O_CREAT | _os.O_EXCL
if hasattr(_os, 'O_NOINHERIT'):
_text_openflags |= _os.O_NOINHERIT
if hasattr(_os, 'O_NOFOLLOW'):
_text_openflags |= _os.O_NOFOLLOW
_bin_openflags = _text_openflags
if hasattr(_os, 'O_BINARY'):
_bin_openflags |= _os.O_BINARY
if hasattr(_os, 'TMP_MAX'):
TMP_MAX = _os.TMP_MAX
else:
TMP_MAX = 10000
template = "tmp"
# Internal routines.
_once_lock = _allocate_lock()
if hasattr(_os, "lstat"):
_stat = _os.lstat
elif hasattr(_os, "stat"):
_stat = _os.stat
else:
# Fallback. All we need is something that raises os.error if the
# file doesn't exist.
def _stat(fn):
try:
f = open(fn)
except IOError:
raise _os.error
f.close()
def _exists(fn):
try:
_stat(fn)
except _os.error:
return False
else:
return True
class _RandomNameSequence:
"""An instance of _RandomNameSequence generates an endless
sequence of unpredictable strings which can safely be incorporated
into file names. Each string is six characters long. Multiple
threads can safely use the same instance at the same time.
_RandomNameSequence is an iterator."""
characters = ("abcdefghijklmnopqrstuvwxyz" +
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"0123456789_")
def __init__(self):
self.mutex = _allocate_lock()
self.normcase = _os.path.normcase
@property
def rng(self):
cur_pid = _os.getpid()
if cur_pid != getattr(self, '_rng_pid', None):
self._rng = _Random()
self._rng_pid = cur_pid
return self._rng
def __iter__(self):
return self
def next(self):
m = self.mutex
c = self.characters
choose = self.rng.choice
m.acquire()
try:
letters = [choose(c) for dummy in "123456"]
finally:
m.release()
return self.normcase(''.join(letters))
def _candidate_tempdir_list():
"""Generate a list of candidate temporary directories which
_get_default_tempdir will try."""
dirlist = []
# First, try the environment.
for envname in 'TMPDIR', 'TEMP', 'TMP':
dirname = _os.getenv(envname)
if dirname: dirlist.append(dirname)
# Failing that, try OS-specific locations.
if _os.name == 'riscos':
dirname = _os.getenv('Wimp$ScrapDir')
if dirname: dirlist.append(dirname)
elif _os.name == 'nt':
dirlist.extend([ r'c:\temp', r'c:\tmp', r'\temp', r'\tmp' ])
else:
dirlist.extend([ '/tmp', '/var/tmp', '/usr/tmp' ])
# As a last resort, the current directory.
try:
dirlist.append(_os.getcwd())
except (AttributeError, _os.error):
dirlist.append(_os.curdir)
return dirlist
def _get_default_tempdir():
"""Calculate the default directory to use for temporary files.
This routine should be called exactly once.
We determine whether or not a candidate temp dir is usable by
trying to create and write to a file in that directory. If this
is successful, the test file is deleted. To prevent denial of
service, the name of the test file must be randomized."""
namer = _RandomNameSequence()
dirlist = _candidate_tempdir_list()
flags = _text_openflags
for dir in dirlist:
if dir != _os.curdir:
dir = _os.path.normcase(_os.path.abspath(dir))
# Try only a few names per directory.
for seq in xrange(100):
name = namer.next()
filename = _os.path.join(dir, name)
try:
fd = _os.open(filename, flags, 0o600)
try:
try:
with _io.open(fd, 'wb', closefd=False) as fp:
fp.write(b'blat')
finally:
_os.close(fd)
finally:
_os.unlink(filename)
return dir
except (OSError, IOError) as e:
if e.args[0] == _errno.EEXIST:
continue
if (_os.name == 'nt' and e.args[0] == _errno.EACCES and
_os.path.isdir(dir) and _os.access(dir, _os.W_OK)):
# On windows, when a directory with the chosen name already
# exists, EACCES error code is returned instead of EEXIST.
continue
break # no point trying more names in this directory
raise IOError, (_errno.ENOENT,
("No usable temporary directory found in %s" % dirlist))
_name_sequence = None
def _get_candidate_names():
"""Common setup sequence for all user-callable interfaces."""
global _name_sequence
if _name_sequence is None:
_once_lock.acquire()
try:
if _name_sequence is None:
_name_sequence = _RandomNameSequence()
finally:
_once_lock.release()
return _name_sequence
def _mkstemp_inner(dir, pre, suf, flags):
"""Code common to mkstemp, TemporaryFile, and NamedTemporaryFile."""
names = _get_candidate_names()
for seq in xrange(TMP_MAX):
name = names.next()
file = _os.path.join(dir, pre + name + suf)
try:
fd = _os.open(file, flags, 0600)
_set_cloexec(fd)
return (fd, _os.path.abspath(file))
except OSError, e:
if e.errno == _errno.EEXIST:
continue # try again
if (_os.name == 'nt' and e.errno == _errno.EACCES and
_os.path.isdir(dir) and _os.access(dir, _os.W_OK)):
# On windows, when a directory with the chosen name already
# exists, EACCES error code is returned instead of EEXIST.
continue
raise
raise IOError, (_errno.EEXIST, "No usable temporary file name found")
# User visible interfaces.
def gettempprefix():
"""Accessor for tempdir.template."""
return template
tempdir = None
def gettempdir():
"""Accessor for tempfile.tempdir."""
global tempdir
if tempdir is None:
_once_lock.acquire()
try:
if tempdir is None:
tempdir = _get_default_tempdir()
finally:
_once_lock.release()
return tempdir
def mkstemp(suffix="", prefix=template, dir=None, text=False):
"""User-callable function to create and return a unique temporary
file. The return value is a pair (fd, name) where fd is the
file descriptor returned by os.open, and name is the filename.
If 'suffix' is specified, the file name will end with that suffix,
otherwise there will be no suffix.
If 'prefix' is specified, the file name will begin with that prefix,
otherwise a default prefix is used.
If 'dir' is specified, the file will be created in that directory,
otherwise a default directory is used.
If 'text' is specified and true, the file is opened in text
mode. Else (the default) the file is opened in binary mode. On
some operating systems, this makes no difference.
The file is readable and writable only by the creating user ID.
If the operating system uses permission bits to indicate whether a
file is executable, the file is executable by no one. The file
descriptor is not inherited by children of this process.
Caller is responsible for deleting the file when done with it.
"""
if dir is None:
dir = gettempdir()
if text:
flags = _text_openflags
else:
flags = _bin_openflags
return _mkstemp_inner(dir, prefix, suffix, flags)
def mkdtemp(suffix="", prefix=template, dir=None):
"""User-callable function to create and return a unique temporary
directory. The return value is the pathname of the directory.
Arguments are as for mkstemp, except that the 'text' argument is
not accepted.
The directory is readable, writable, and searchable only by the
creating user.
Caller is responsible for deleting the directory when done with it.
"""
if dir is None:
dir = gettempdir()
names = _get_candidate_names()
for seq in xrange(TMP_MAX):
name = names.next()
file = _os.path.join(dir, prefix + name + suffix)
try:
_os.mkdir(file, 0700)
return file
except OSError, e:
if e.errno == _errno.EEXIST:
continue # try again
if (_os.name == 'nt' and e.errno == _errno.EACCES and
_os.path.isdir(dir) and _os.access(dir, _os.W_OK)):
# On windows, when a directory with the chosen name already
# exists, EACCES error code is returned instead of EEXIST.
continue
raise
raise IOError, (_errno.EEXIST, "No usable temporary directory name found")
def mktemp(suffix="", prefix=template, dir=None):
"""User-callable function to return a unique temporary file name. The
file is not created.
Arguments are as for mkstemp, except that the 'text' argument is
not accepted.
This function is unsafe and should not be used. The file name
refers to a file that did not exist at some point, but by the time
you get around to creating it, someone else may have beaten you to
the punch.
"""
## from warnings import warn as _warn
## _warn("mktemp is a potential security risk to your program",
## RuntimeWarning, stacklevel=2)
if dir is None:
dir = gettempdir()
names = _get_candidate_names()
for seq in xrange(TMP_MAX):
name = names.next()
file = _os.path.join(dir, prefix + name + suffix)
if not _exists(file):
return file
raise IOError, (_errno.EEXIST, "No usable temporary filename found")
class _TemporaryFileWrapper:
"""Temporary file wrapper
This class provides a wrapper around files opened for
temporary use. In particular, it seeks to automatically
remove the file when it is no longer needed.
"""
def __init__(self, file, name, delete=True):
self.file = file
self.name = name
self.close_called = False
self.delete = delete
def __getattr__(self, name):
# Attribute lookups are delegated to the underlying file
# and cached for non-numeric results
# (i.e. methods are cached, closed and friends are not)
file = self.__dict__['file']
a = getattr(file, name)
if not issubclass(type(a), type(0)):
setattr(self, name, a)
return a
# The underlying __enter__ method returns the wrong object
# (self.file) so override it to return the wrapper
def __enter__(self):
self.file.__enter__()
return self
# NT provides delete-on-close as a primitive, so we don't need
# the wrapper to do anything special. We still use it so that
# file.name is useful (i.e. not "(fdopen)") with NamedTemporaryFile.
if _os.name != 'nt':
# Cache the unlinker so we don't get spurious errors at
# shutdown when the module-level "os" is None'd out. Note
# that this must be referenced as self.unlink, because the
# name TemporaryFileWrapper may also get None'd out before
# __del__ is called.
unlink = _os.unlink
def close(self):
if not self.close_called:
self.close_called = True
try:
self.file.close()
finally:
if self.delete:
self.unlink(self.name)
def __del__(self):
self.close()
# Need to trap __exit__ as well to ensure the file gets
# deleted when used in a with statement
def __exit__(self, exc, value, tb):
result = self.file.__exit__(exc, value, tb)
self.close()
return result
else:
def __exit__(self, exc, value, tb):
self.file.__exit__(exc, value, tb)
def NamedTemporaryFile(mode='w+b', bufsize=-1, suffix="",
prefix=template, dir=None, delete=True):
"""Create and return a temporary file.
Arguments:
'prefix', 'suffix', 'dir' -- as for mkstemp.
'mode' -- the mode argument to os.fdopen (default "w+b").
'bufsize' -- the buffer size argument to os.fdopen (default -1).
'delete' -- whether the file is deleted on close (default True).
The file is created as mkstemp() would do it.
Returns an object with a file-like interface; the name of the file
is accessible as its 'name' attribute. The file will be automatically
deleted when it is closed unless the 'delete' argument is set to False.
"""
if dir is None:
dir = gettempdir()
if 'b' in mode:
flags = _bin_openflags
else:
flags = _text_openflags
# Setting O_TEMPORARY in the flags causes the OS to delete
# the file when it is closed. This is only supported by Windows.
if _os.name == 'nt' and delete:
flags |= _os.O_TEMPORARY
(fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
try:
file = _os.fdopen(fd, mode, bufsize)
return _TemporaryFileWrapper(file, name, delete)
except BaseException:
_os.unlink(name)
_os.close(fd)
raise
if _os.name != 'posix' or _os.sys.platform == 'cygwin':
# On non-POSIX and Cygwin systems, assume that we cannot unlink a file
# while it is open.
TemporaryFile = NamedTemporaryFile
else:
def TemporaryFile(mode='w+b', bufsize=-1, suffix="",
prefix=template, dir=None):
"""Create and return a temporary file.
Arguments:
'prefix', 'suffix', 'dir' -- as for mkstemp.
'mode' -- the mode argument to os.fdopen (default "w+b").
'bufsize' -- the buffer size argument to os.fdopen (default -1).
The file is created as mkstemp() would do it.
Returns an object with a file-like interface. The file has no
name, and will cease to exist when it is closed.
"""
if dir is None:
dir = gettempdir()
if 'b' in mode:
flags = _bin_openflags
else:
flags = _text_openflags
(fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
try:
_os.unlink(name)
return _os.fdopen(fd, mode, bufsize)
except:
_os.close(fd)
raise
class SpooledTemporaryFile:
"""Temporary file wrapper, specialized to switch from
StringIO to a real file when it exceeds a certain size or
when a fileno is needed.
"""
_rolled = False
def __init__(self, max_size=0, mode='w+b', bufsize=-1,
suffix="", prefix=template, dir=None):
self._file = _StringIO()
self._max_size = max_size
self._rolled = False
self._TemporaryFileArgs = (mode, bufsize, suffix, prefix, dir)
def _check(self, file):
if self._rolled: return
max_size = self._max_size
if max_size and file.tell() > max_size:
self.rollover()
def rollover(self):
if self._rolled: return
file = self._file
newfile = self._file = TemporaryFile(*self._TemporaryFileArgs)
del self._TemporaryFileArgs
newfile.write(file.getvalue())
newfile.seek(file.tell(), 0)
self._rolled = True
# The method caching trick from NamedTemporaryFile
# won't work here, because _file may change from a
# _StringIO instance to a real file. So we list
# all the methods directly.
# Context management protocol
def __enter__(self):
if self._file.closed:
raise ValueError("Cannot enter context with closed file")
return self
def __exit__(self, exc, value, tb):
self._file.close()
# file protocol
def __iter__(self):
return self._file.__iter__()
def close(self):
self._file.close()
@property
def closed(self):
return self._file.closed
def fileno(self):
self.rollover()
return self._file.fileno()
def flush(self):
self._file.flush()
def isatty(self):
return self._file.isatty()
@property
def mode(self):
try:
return self._file.mode
except AttributeError:
return self._TemporaryFileArgs[0]
@property
def name(self):
try:
return self._file.name
except AttributeError:
return None
def next(self):
return self._file.next
def read(self, *args):
return self._file.read(*args)
def readline(self, *args):
return self._file.readline(*args)
def readlines(self, *args):
return self._file.readlines(*args)
def seek(self, *args):
self._file.seek(*args)
@property
def softspace(self):
return self._file.softspace
def tell(self):
return self._file.tell()
def truncate(self):
self._file.truncate()
def write(self, s):
file = self._file
rv = file.write(s)
self._check(file)
return rv
def writelines(self, iterable):
file = self._file
rv = file.writelines(iterable)
self._check(file)
return rv
def xreadlines(self, *args):
if hasattr(self._file, 'xreadlines'): # real file
return iter(self._file)
else: # StringIO()
return iter(self._file.readlines(*args))