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# osutil.py - pure Python version of osutil.c
#
# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import os
import stat as statmod
def _mode_to_kind(mode):
if statmod.S_ISREG(mode):
return statmod.S_IFREG
if statmod.S_ISDIR(mode):
return statmod.S_IFDIR
if statmod.S_ISLNK(mode):
return statmod.S_IFLNK
if statmod.S_ISBLK(mode):
return statmod.S_IFBLK
if statmod.S_ISCHR(mode):
return statmod.S_IFCHR
if statmod.S_ISFIFO(mode):
return statmod.S_IFIFO
if statmod.S_ISSOCK(mode):
return statmod.S_IFSOCK
return mode
def listdir(path, stat=False, skip=None):
'''listdir(path, stat=False) -> list_of_tuples
Return a sorted list containing information about the entries
in the directory.
If stat is True, each element is a 3-tuple:
(name, type, stat object)
Otherwise, each element is a 2-tuple:
(name, type)
'''
result = []
prefix = path
if not prefix.endswith(os.sep):
prefix += os.sep
names = os.listdir(path)
names.sort()
for fn in names:
st = os.lstat(prefix + fn)
if fn == skip and statmod.S_ISDIR(st.st_mode):
return []
if stat:
result.append((fn, _mode_to_kind(st.st_mode), st))
else:
result.append((fn, _mode_to_kind(st.st_mode)))
return result
if os.name != 'nt':
posixfile = open
else:
import ctypes, ctypes.util
_kernel32 = ctypes.windll.kernel32
_DWORD = ctypes.c_ulong
_LPCSTR = _LPSTR = ctypes.c_char_p
_HANDLE = ctypes.c_void_p
_INVALID_HANDLE_VALUE = _HANDLE(-1).value
def _crtname():
try:
# find_msvcrt was introduced in Python 2.6
return ctypes.util.find_msvcrt()
except AttributeError:
return 'msvcr71.dll' # CPython 2.5 and 2.4
_crt = ctypes.PyDLL(_crtname())
# CreateFile
_FILE_SHARE_READ = 0x00000001
_FILE_SHARE_WRITE = 0x00000002
_FILE_SHARE_DELETE = 0x00000004
_CREATE_ALWAYS = 2
_OPEN_EXISTING = 3
_OPEN_ALWAYS = 4
_GENERIC_READ = 0x80000000
_GENERIC_WRITE = 0x40000000
_FILE_ATTRIBUTE_NORMAL = 0x80
# _open_osfhandle
_O_RDONLY = 0x0000
_O_RDWR = 0x0002
_O_APPEND = 0x0008
_O_TEXT = 0x4000
_O_BINARY = 0x8000
# types of parameters of C functions used (required by pypy)
_kernel32.CreateFileA.argtypes = [_LPCSTR, _DWORD, _DWORD, ctypes.c_void_p,
_DWORD, _DWORD, _HANDLE]
_kernel32.CreateFileA.restype = _HANDLE
_crt._open_osfhandle.argtypes = [_HANDLE, ctypes.c_int]
_crt._open_osfhandle.restype = ctypes.c_int
def _raiseioerror(name):
err = ctypes.WinError()
raise IOError(err.errno, '%s: %s' % (name, err.strerror))
class posixfile(object):
'''a file object aiming for POSIX-like semantics
CPython's open() returns a file that was opened *without* setting the
_FILE_SHARE_DELETE flag, which causes rename and unlink to abort.
This even happens if any hardlinked copy of the file is in open state.
We set _FILE_SHARE_DELETE here, so files opened with posixfile can be
renamed and deleted while they are held open.
Note that if a file opened with posixfile is unlinked, the file
remains but cannot be opened again or be recreated under the same name,
until all reading processes have closed the file.'''
def __init__(self, name, mode='r', bufsize=-1):
if 'b' in mode:
flags = _O_BINARY
else:
flags = _O_TEXT
m0 = mode[0]
if m0 == 'r' and not '+' in mode:
flags |= _O_RDONLY
access = _GENERIC_READ
else:
# work around http://support.microsoft.com/kb/899149 and
# set _O_RDWR for 'w' and 'a', even if mode has no '+'
flags |= _O_RDWR
access = _GENERIC_READ | _GENERIC_WRITE
if m0 == 'r':
creation = _OPEN_EXISTING
elif m0 == 'w':
creation = _CREATE_ALWAYS
elif m0 == 'a':
creation = _OPEN_ALWAYS
flags |= _O_APPEND
else:
raise ValueError("invalid mode: %s" % mode)
fh = _kernel32.CreateFileA(name, access,
_FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE,
None, creation, _FILE_ATTRIBUTE_NORMAL, None)
if fh == _INVALID_HANDLE_VALUE:
_raiseioerror(name)
# for CPython we must use the same CRT as Python uses,
# or the os.fdopen call below will abort with
# "OSError: [Errno 9] Bad file descriptor"
fd = _crt._open_osfhandle(fh, flags)
if fd == -1:
_kernel32.CloseHandle(fh)
_raiseioerror(name)
f = os.fdopen(fd, mode, bufsize)
# unfortunately, f.name is '<fdopen>' at this point -- so we store
# the name on this wrapper. We cannot just assign to f.name,
# because that attribute is read-only.
object.__setattr__(self, 'name', name)
object.__setattr__(self, '_file', f)
def __iter__(self):
return self._file
def __getattr__(self, name):
return getattr(self._file, name)
def __setattr__(self, name, value):
'''mimics the read-only attributes of Python file objects
by raising 'TypeError: readonly attribute' if someone tries:
f = posixfile('foo.txt')
f.name = 'bla' '''
return self._file.__setattr__(name, value)
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