def realpath(fpath):
while islink(fpath):
rpath = readlink(fpath)
if rpath is None:
return fpath
if not os.path.isabs(rpath):
rpath = os.path.abspath(os.path.join(os.path.dirname(fpath), rpath))
fpath = rpath
return fpath
def realpath(fpath):
while islink(fpath):
rpath = readlink(fpath)
if rpath is None:
return fpath
if not os.path.isabs(rpath):
rpath = os.path.abspath(
os.path.join(os.path.dirname(fpath), rpath))
fpath = rpath
return fpath
def is_link_to(path, target):
def normalize(path):
return os.path.normcase(os.path.normpath(path))
return islink(path) and \
normalize(realpath(path)) == normalize(realpath(target))
def readlink(path):
""" Windows readlink implementation. """
# This wouldn't return true if the file didn't exist, as far as I know.
if not islink(path):
if win32_verbose:
print("readlink(%s): not a link." % path)
return None
# Open the file correctly depending on the string type.
hfile = CreateFile(path, GENERIC_READ, 0, OPEN_EXISTING,
FILE_FLAG_OPEN_REPARSE_POINT)
# MAXIMUM_REPARSE_DATA_BUFFER_SIZE = 16384 = (16*1024)
buffer = DeviceIoControl(hfile, FSCTL_GET_REPARSE_POINT, None, 16384)
CloseHandle(hfile)
# Minimum possible length (assuming length of the target is bigger than 0)
if not buffer or len(buffer) < 9:
if win32_verbose:
print("readlink(%s): no reparse buffer." % path)
return None
# Parse and return our result.
# typedef struct _REPARSE_DATA_BUFFER {
# ULONG ReparseTag;
# USHORT ReparseDataLength;
# USHORT Reserved;
# union {
# struct {
# USHORT SubstituteNameOffset;
# USHORT SubstituteNameLength;
# USHORT PrintNameOffset;
# USHORT PrintNameLength;
# ULONG Flags;
# WCHAR PathBuffer[1];
# } SymbolicLinkReparseBuffer;
# struct {
# USHORT SubstituteNameOffset;
# USHORT SubstituteNameLength;
# USHORT PrintNameOffset;
# USHORT PrintNameLength;
# WCHAR PathBuffer[1];
# } MountPointReparseBuffer;
# struct {
# UCHAR DataBuffer[1];
# } GenericReparseBuffer;
# } DUMMYUNIONNAME;
# } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
# Only handle SymbolicLinkReparseBuffer
(tag, dataLength, reserver, SubstituteNameOffset, SubstituteNameLength,
PrintNameOffset, PrintNameLength,
Flags) = struct.unpack(SymbolicLinkReparseFormat,
buffer[:SymbolicLinkReparseSize])
# print tag, dataLength, reserver, SubstituteNameOffset, SubstituteNameLength
start = SubstituteNameOffset + SymbolicLinkReparseSize
actualPath = buffer[start:start +
SubstituteNameLength].decode("utf-16")
# This utf-16 string is null terminated
index = actualPath.find("\0")
if index > 0:
actualPath = actualPath[:index]
if actualPath.startswith("\\??\\"): # ASCII 92, 63, 63, 92
ret = actualPath[4:] # strip off leading junk
else:
ret = actualPath
if win32_verbose:
print("readlink(%s->%s->%s): index(null) = %d"%\
(path,repr(actualPath),repr(ret),index))
return ret
def readlink(path):
""" Windows readlink implementation. """
# This wouldn't return true if the file didn't exist, as far as I know.
if not islink(path):
if win32_verbose:
print("readlink(%s): not a link."%path)
return None
# Open the file correctly depending on the string type.
hfile = CreateFile(path, GENERIC_READ, 0, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT)
# MAXIMUM_REPARSE_DATA_BUFFER_SIZE = 16384 = (16*1024)
buffer = DeviceIoControl(hfile, FSCTL_GET_REPARSE_POINT, None, 16384)
CloseHandle(hfile)
# Minimum possible length (assuming length of the target is bigger than 0)
if not buffer or len(buffer) < 9:
if win32_verbose:
print("readlink(%s): no reparse buffer."%path)
return None
# Parse and return our result.
# typedef struct _REPARSE_DATA_BUFFER {
# ULONG ReparseTag;
# USHORT ReparseDataLength;
# USHORT Reserved;
# union {
# struct {
# USHORT SubstituteNameOffset;
# USHORT SubstituteNameLength;
# USHORT PrintNameOffset;
# USHORT PrintNameLength;
# ULONG Flags;
# WCHAR PathBuffer[1];
# } SymbolicLinkReparseBuffer;
# struct {
# USHORT SubstituteNameOffset;
# USHORT SubstituteNameLength;
# USHORT PrintNameOffset;
# USHORT PrintNameLength;
# WCHAR PathBuffer[1];
# } MountPointReparseBuffer;
# struct {
# UCHAR DataBuffer[1];
# } GenericReparseBuffer;
# } DUMMYUNIONNAME;
# } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
# Only handle SymbolicLinkReparseBuffer
(tag, dataLength, reserver, SubstituteNameOffset, SubstituteNameLength,
PrintNameOffset, PrintNameLength,
Flags) = struct.unpack(SymbolicLinkReparseFormat,
buffer[:SymbolicLinkReparseSize])
# print tag, dataLength, reserver, SubstituteNameOffset, SubstituteNameLength
start = SubstituteNameOffset + SymbolicLinkReparseSize
actualPath = buffer[start : start + SubstituteNameLength].decode("utf-16")
# This utf-16 string is null terminated
index = actualPath.find("\0")
if index > 0:
actualPath = actualPath[:index]
if actualPath.startswith("\\??\\"): # ASCII 92, 63, 63, 92
ret = actualPath[4:] # strip off leading junk
else:
ret = actualPath
if win32_verbose:
print("readlink(%s->%s->%s): index(null) = %d"%\
(path,repr(actualPath),repr(ret),index))
return ret
