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
|
"""Constants/functions for interpreting results of os.stat() and os.lstat().
Suggested usage: from stat import *
"""
# Indices for stat struct members in the tuple returned by os.stat()
ST_MODE = 0
ST_INO = 1
ST_DEV = 2
ST_NLINK = 3
ST_UID = 4
ST_GID = 5
ST_SIZE = 6
ST_ATIME = 7
ST_MTIME = 8
ST_CTIME = 9
# Extract bits from the mode
def S_IMODE(mode):
"""Return the portion of the file's mode that can be set by
os.chmod().
"""
return mode & 0o7777
def S_IFMT(mode):
"""Return the portion of the file's mode that describes the
file type.
"""
return mode & 0o170000
# Constants used as S_IFMT() for various file types
# (not all are implemented on all systems)
S_IFDIR = 0o040000 # directory
S_IFCHR = 0o020000 # character device
S_IFBLK = 0o060000 # block device
S_IFREG = 0o100000 # regular file
S_IFIFO = 0o010000 # fifo (named pipe)
S_IFLNK = 0o120000 # symbolic link
S_IFSOCK = 0o140000 # socket file
# Functions to test for each file type
def S_ISDIR(mode):
"""Return True if mode is from a directory."""
return S_IFMT(mode) == S_IFDIR
def S_ISCHR(mode):
"""Return True if mode is from a character special device file."""
return S_IFMT(mode) == S_IFCHR
def S_ISBLK(mode):
"""Return True if mode is from a block special device file."""
return S_IFMT(mode) == S_IFBLK
def S_ISREG(mode):
"""Return True if mode is from a regular file."""
return S_IFMT(mode) == S_IFREG
def S_ISFIFO(mode):
"""Return True if mode is from a FIFO (named pipe)."""
return S_IFMT(mode) == S_IFIFO
def S_ISLNK(mode):
"""Return True if mode is from a symbolic link."""
return S_IFMT(mode) == S_IFLNK
def S_ISSOCK(mode):
"""Return True if mode is from a socket."""
return S_IFMT(mode) == S_IFSOCK
# Names for permission bits
S_ISUID = 0o4000 # set UID bit
S_ISGID = 0o2000 # set GID bit
S_ENFMT = S_ISGID # file locking enforcement
S_ISVTX = 0o1000 # sticky bit
S_IREAD = 0o0400 # Unix V7 synonym for S_IRUSR
S_IWRITE = 0o0200 # Unix V7 synonym for S_IWUSR
S_IEXEC = 0o0100 # Unix V7 synonym for S_IXUSR
S_IRWXU = 0o0700 # mask for owner permissions
S_IRUSR = 0o0400 # read by owner
S_IWUSR = 0o0200 # write by owner
S_IXUSR = 0o0100 # execute by owner
S_IRWXG = 0o0070 # mask for group permissions
S_IRGRP = 0o0040 # read by group
S_IWGRP = 0o0020 # write by group
S_IXGRP = 0o0010 # execute by group
S_IRWXO = 0o0007 # mask for others (not in group) permissions
S_IROTH = 0o0004 # read by others
S_IWOTH = 0o0002 # write by others
S_IXOTH = 0o0001 # execute by others
# Names for file flags
UF_NODUMP = 0x00000001 # do not dump file
UF_IMMUTABLE = 0x00000002 # file may not be changed
UF_APPEND = 0x00000004 # file may only be appended to
UF_OPAQUE = 0x00000008 # directory is opaque when viewed through a union stack
UF_NOUNLINK = 0x00000010 # file may not be renamed or deleted
UF_COMPRESSED = 0x00000020 # OS X: file is hfs-compressed
UF_HIDDEN = 0x00008000 # OS X: file should not be displayed
SF_ARCHIVED = 0x00010000 # file may be archived
SF_IMMUTABLE = 0x00020000 # file may not be changed
SF_APPEND = 0x00040000 # file may only be appended to
SF_NOUNLINK = 0x00100000 # file may not be renamed or deleted
SF_SNAPSHOT = 0x00200000 # file is a snapshot file
_filemode_table = (
((S_IFLNK, "l"),
(S_IFREG, "-"),
(S_IFBLK, "b"),
(S_IFDIR, "d"),
(S_IFCHR, "c"),
(S_IFIFO, "p")),
((S_IRUSR, "r"),),
((S_IWUSR, "w"),),
((S_IXUSR|S_ISUID, "s"),
(S_ISUID, "S"),
(S_IXUSR, "x")),
((S_IRGRP, "r"),),
((S_IWGRP, "w"),),
((S_IXGRP|S_ISGID, "s"),
(S_ISGID, "S"),
(S_IXGRP, "x")),
((S_IROTH, "r"),),
((S_IWOTH, "w"),),
((S_IXOTH|S_ISVTX, "t"),
(S_ISVTX, "T"),
(S_IXOTH, "x"))
)
def filemode(mode):
"""Convert a file's mode to a string of the form '-rwxrwxrwx'."""
perm = []
for table in _filemode_table:
for bit, char in table:
if mode & bit == bit:
perm.append(char)
break
else:
perm.append("-")
return "".join(perm)
|
