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
|
# Temporary file name allocation
#
# XXX This tries to be not UNIX specific, but I don't know beans about
# how to choose a temp directory or filename on MS-DOS or other
# systems so it may have to be changed...
import os
# Parameters that the caller may set to override the defaults
tempdir = None
template = None
# Function to calculate the directory to use
def gettempdir():
global tempdir
if tempdir is not None:
return tempdir
try:
pwd = os.getcwd()
except (AttributeError, os.error):
pwd = os.curdir
attempdirs = ['/usr/tmp', '/tmp', pwd]
if os.name == 'nt':
attempdirs.insert(0, 'C:\\TEMP')
attempdirs.insert(0, '\\TEMP')
elif os.name == 'mac':
import macfs, MACFS
try:
refnum, dirid = macfs.FindFolder(MACFS.kOnSystemDisk,
MACFS.kTemporaryFolderType, 0)
dirname = macfs.FSSpec((refnum, dirid, '')).as_pathname()
attempdirs.insert(0, dirname)
except macfs.error:
pass
for envname in 'TMPDIR', 'TEMP', 'TMP':
if os.environ.has_key(envname):
attempdirs.insert(0, os.environ[envname])
testfile = gettempprefix() + 'test'
for dir in attempdirs:
try:
filename = os.path.join(dir, testfile)
fp = open(filename, 'w')
fp.write('blat')
fp.close()
os.unlink(filename)
tempdir = dir
break
except IOError:
pass
if tempdir is None:
msg = "Can't find a usable temporary directory amongst " + `attempdirs`
raise IOError, msg
return tempdir
# Function to calculate a prefix of the filename to use
def gettempprefix():
global template
if template == None:
if os.name == 'posix':
template = '@' + `os.getpid()` + '.'
elif os.name == 'nt':
template = '~' + `os.getpid()` + '-'
elif os.name == 'mac':
template = 'Python-Tmp-'
else:
template = 'tmp' # XXX might choose a better one
return template
# Counter for generating unique names
counter = 0
# User-callable function to return a unique temporary file name
def mktemp(suffix=""):
global counter
dir = gettempdir()
pre = gettempprefix()
while 1:
counter = counter + 1
file = os.path.join(dir, pre + `counter` + suffix)
if not os.path.exists(file):
return file
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, path):
self.file = file
self.path = path
def close(self):
self.file.close()
os.unlink(self.path)
def __del__(self):
try: self.close()
except: pass
def __getattr__(self, name):
file = self.__dict__['file']
a = getattr(file, name)
setattr(self, name, a)
return a
def TemporaryFile(mode='w+b', bufsize=-1, suffix=""):
name = mktemp(suffix)
file = open(name, mode, bufsize)
try:
os.unlink(name)
except os.error:
# Non-unix -- can't unlink file that's still open, use wrapper
return TemporaryFileWrapper(file, name)
else:
return file
|
