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osutil.py
207 lines | 5.9 KiB | text/x-python | PythonLexer
# osutil.py - pure Python version of osutil.c
#
# Copyright 2009 Olivia Mackall <olivia@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 ctypes
import ctypes.util
import os
import stat as statmod
from ..pycompat import getattr
from .. import (
encoding,
pycompat,
)
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(pycompat.ossep):
prefix += pycompat.ossep
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 not pycompat.iswindows:
posixfile = open
else:
import msvcrt
_kernel32 = ctypes.windll.kernel32 # pytype: disable=module-attr
_DWORD = ctypes.c_ulong
_LPCSTR = _LPSTR = ctypes.c_char_p
_HANDLE = ctypes.c_void_p
_INVALID_HANDLE_VALUE = _HANDLE(-1).value
# 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 flags
_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
def _raiseioerror(name):
err = ctypes.WinError() # pytype: disable=module-attr
raise IOError(
err.errno, '%s: %s' % (encoding.strfromlocal(name), err.strerror)
)
class posixfile:
"""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=b'r', bufsize=-1):
if b'b' in mode:
flags = _O_BINARY
else:
flags = _O_TEXT
m0 = mode[0:1]
if m0 == b'r' and b'+' 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 == b'r':
creation = _OPEN_EXISTING
elif m0 == b'w':
creation = _CREATE_ALWAYS
elif m0 == b'a':
creation = _OPEN_ALWAYS
flags |= _O_APPEND
else:
raise ValueError("invalid mode: %s" % pycompat.sysstr(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)
fd = msvcrt.open_osfhandle(fh, flags) # pytype: disable=module-attr
if fd == -1:
_kernel32.CloseHandle(fh)
_raiseioerror(name)
f = os.fdopen(fd, pycompat.sysstr(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)
def __enter__(self):
self._file.__enter__()
return self
def __exit__(self, exc_type, exc_value, exc_tb):
return self._file.__exit__(exc_type, exc_value, exc_tb)