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