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Implement islink, readlink and realpath using Win32 api
Change-Id: I18452cbb32d24db73601ad10485dbe6bb278731c
This commit is contained in:
Renaud Paquay
parent
2a4be94878
commit
227ad2ef42
@ -242,3 +242,57 @@ def rename(src, dst):
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raise
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else:
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os.rename(src, dst)
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def islink(path):
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"""Test whether a path is a symbolic link.
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Availability: Windows, Unix.
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"""
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if isWindows():
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import platform_utils_win32
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return platform_utils_win32.islink(path)
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else:
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return os.path.islink(path)
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def readlink(path):
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"""Return a string representing the path to which the symbolic link
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points. The result may be either an absolute or relative pathname;
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if it is relative, it may be converted to an absolute pathname using
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os.path.join(os.path.dirname(path), result).
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Availability: Windows, Unix.
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"""
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if isWindows():
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import platform_utils_win32
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return platform_utils_win32.readlink(path)
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else:
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return os.readlink(path)
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def realpath(path):
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"""Return the canonical path of the specified filename, eliminating
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any symbolic links encountered in the path.
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Availability: Windows, Unix.
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"""
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if isWindows():
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current_path = os.path.abspath(path)
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path_tail = []
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for c in range(0, 100): # Avoid cycles
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if islink(current_path):
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target = readlink(current_path)
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current_path = os.path.join(os.path.dirname(current_path), target)
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else:
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basename = os.path.basename(current_path)
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if basename == '':
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path_tail.append(current_path)
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break
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path_tail.append(basename)
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current_path = os.path.dirname(current_path)
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path_tail.reverse()
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result = os.path.normpath(os.path.join(*path_tail))
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return result
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else:
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return os.path.realpath(path)
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@ -15,13 +15,20 @@
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import errno
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from ctypes import WinDLL, get_last_error, FormatError, WinError
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from ctypes.wintypes import BOOL, LPCWSTR, DWORD
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from ctypes import WinDLL, get_last_error, FormatError, WinError, addressof
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from ctypes import c_buffer
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from ctypes.wintypes import BOOL, LPCWSTR, DWORD, HANDLE, POINTER, c_ubyte
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from ctypes.wintypes import WCHAR, USHORT, LPVOID, Structure, Union, ULONG
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from ctypes.wintypes import byref
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kernel32 = WinDLL('kernel32', use_last_error=True)
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LPDWORD = POINTER(DWORD)
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UCHAR = c_ubyte
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# Win32 error codes
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ERROR_SUCCESS = 0
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ERROR_NOT_SUPPORTED = 50
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ERROR_PRIVILEGE_NOT_HELD = 1314
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# Win32 API entry points
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@ -35,6 +42,94 @@ CreateSymbolicLinkW.argtypes = (LPCWSTR, # lpSymlinkFileName In
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SYMBOLIC_LINK_FLAG_FILE = 0x00
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SYMBOLIC_LINK_FLAG_DIRECTORY = 0x01
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GetFileAttributesW = kernel32.GetFileAttributesW
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GetFileAttributesW.restype = DWORD
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GetFileAttributesW.argtypes = (LPCWSTR,) # lpFileName In
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INVALID_FILE_ATTRIBUTES = 0xFFFFFFFF
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FILE_ATTRIBUTE_REPARSE_POINT = 0x00400
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CreateFileW = kernel32.CreateFileW
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CreateFileW.restype = HANDLE
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CreateFileW.argtypes = (LPCWSTR, # lpFileName In
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DWORD, # dwDesiredAccess In
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DWORD, # dwShareMode In
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LPVOID, # lpSecurityAttributes In_opt
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DWORD, # dwCreationDisposition In
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DWORD, # dwFlagsAndAttributes In
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HANDLE) # hTemplateFile In_opt
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CloseHandle = kernel32.CloseHandle
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CloseHandle.restype = BOOL
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CloseHandle.argtypes = (HANDLE,) # hObject In
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INVALID_HANDLE_VALUE = HANDLE(-1).value
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OPEN_EXISTING = 3
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FILE_FLAG_BACKUP_SEMANTICS = 0x02000000
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FILE_FLAG_OPEN_REPARSE_POINT = 0x00200000
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DeviceIoControl = kernel32.DeviceIoControl
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DeviceIoControl.restype = BOOL
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DeviceIoControl.argtypes = (HANDLE, # hDevice In
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DWORD, # dwIoControlCode In
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LPVOID, # lpInBuffer In_opt
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DWORD, # nInBufferSize In
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LPVOID, # lpOutBuffer Out_opt
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DWORD, # nOutBufferSize In
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LPDWORD, # lpBytesReturned Out_opt
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LPVOID) # lpOverlapped Inout_opt
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# Device I/O control flags and options
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FSCTL_GET_REPARSE_POINT = 0x000900A8
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IO_REPARSE_TAG_MOUNT_POINT = 0xA0000003
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IO_REPARSE_TAG_SYMLINK = 0xA000000C
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MAXIMUM_REPARSE_DATA_BUFFER_SIZE = 0x4000
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class GENERIC_REPARSE_BUFFER(Structure):
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_fields_ = (('DataBuffer', UCHAR * 1),)
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class SYMBOLIC_LINK_REPARSE_BUFFER(Structure):
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_fields_ = (('SubstituteNameOffset', USHORT),
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('SubstituteNameLength', USHORT),
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('PrintNameOffset', USHORT),
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('PrintNameLength', USHORT),
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('Flags', ULONG),
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('PathBuffer', WCHAR * 1))
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@property
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def PrintName(self):
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arrayt = WCHAR * (self.PrintNameLength // 2)
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offset = type(self).PathBuffer.offset + self.PrintNameOffset
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return arrayt.from_address(addressof(self) + offset).value
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class MOUNT_POINT_REPARSE_BUFFER(Structure):
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_fields_ = (('SubstituteNameOffset', USHORT),
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('SubstituteNameLength', USHORT),
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('PrintNameOffset', USHORT),
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('PrintNameLength', USHORT),
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('PathBuffer', WCHAR * 1))
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@property
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def PrintName(self):
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arrayt = WCHAR * (self.PrintNameLength // 2)
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offset = type(self).PathBuffer.offset + self.PrintNameOffset
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return arrayt.from_address(addressof(self) + offset).value
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class REPARSE_DATA_BUFFER(Structure):
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class REPARSE_BUFFER(Union):
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_fields_ = (('SymbolicLinkReparseBuffer', SYMBOLIC_LINK_REPARSE_BUFFER),
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('MountPointReparseBuffer', MOUNT_POINT_REPARSE_BUFFER),
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('GenericReparseBuffer', GENERIC_REPARSE_BUFFER))
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_fields_ = (('ReparseTag', ULONG),
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('ReparseDataLength', USHORT),
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('Reserved', USHORT),
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('ReparseBuffer', REPARSE_BUFFER))
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_anonymous_ = ('ReparseBuffer',)
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def create_filesymlink(source, link_name):
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"""Creates a Windows file symbolic link source pointing to link_name."""
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@ -58,6 +153,65 @@ def _create_symlink(source, link_name, dwFlags):
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error_desc = FormatError(code).strip()
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if code == ERROR_PRIVILEGE_NOT_HELD:
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raise OSError(errno.EPERM, error_desc, link_name)
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error_desc = 'Error creating symbolic link %s: %s'.format(
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link_name, error_desc)
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_raise_winerror(
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code,
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'Error creating symbolic link \"%s\"'.format(link_name))
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def islink(path):
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result = GetFileAttributesW(path)
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if result == INVALID_FILE_ATTRIBUTES:
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return False
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return bool(result & FILE_ATTRIBUTE_REPARSE_POINT)
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def readlink(path):
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reparse_point_handle = CreateFileW(path,
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0,
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0,
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None,
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OPEN_EXISTING,
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FILE_FLAG_OPEN_REPARSE_POINT |
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FILE_FLAG_BACKUP_SEMANTICS,
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None)
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if reparse_point_handle == INVALID_HANDLE_VALUE:
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_raise_winerror(
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get_last_error(),
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'Error opening symblic link \"%s\"'.format(path))
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target_buffer = c_buffer(MAXIMUM_REPARSE_DATA_BUFFER_SIZE)
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n_bytes_returned = DWORD()
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io_result = DeviceIoControl(reparse_point_handle,
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FSCTL_GET_REPARSE_POINT,
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None,
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0,
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target_buffer,
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len(target_buffer),
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byref(n_bytes_returned),
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None)
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CloseHandle(reparse_point_handle)
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if not io_result:
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_raise_winerror(
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get_last_error(),
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'Error reading symblic link \"%s\"'.format(path))
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rdb = REPARSE_DATA_BUFFER.from_buffer(target_buffer)
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if rdb.ReparseTag == IO_REPARSE_TAG_SYMLINK:
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return _preserve_encoding(path, rdb.SymbolicLinkReparseBuffer.PrintName)
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elif rdb.ReparseTag == IO_REPARSE_TAG_MOUNT_POINT:
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return _preserve_encoding(path, rdb.MountPointReparseBuffer.PrintName)
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# Unsupported reparse point type
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_raise_winerror(
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ERROR_NOT_SUPPORTED,
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'Error reading symblic link \"%s\"'.format(path))
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def _preserve_encoding(source, target):
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"""Ensures target is the same string type (i.e. unicode or str) as source."""
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if isinstance(source, unicode):
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return unicode(target)
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return str(target)
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def _raise_winerror(code, error_desc):
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win_error_desc = FormatError(code).strip()
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error_desc = "%s: %s".format(error_desc, win_error_desc)
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raise WinError(code, error_desc)
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26
project.py
26
project.py
@ -103,7 +103,7 @@ def _ProjectHooks():
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"""
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global _project_hook_list
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if _project_hook_list is None:
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d = os.path.realpath(os.path.abspath(os.path.dirname(__file__)))
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d = platform_utils.realpath(os.path.abspath(os.path.dirname(__file__)))
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d = os.path.join(d, 'hooks')
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_project_hook_list = [os.path.join(d, x) for x in os.listdir(d)]
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return _project_hook_list
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@ -275,7 +275,7 @@ class _LinkFile(object):
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def __linkIt(self, relSrc, absDest):
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# link file if it does not exist or is out of date
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if not os.path.islink(absDest) or (os.readlink(absDest) != relSrc):
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if not platform_utils.islink(absDest) or (platform_utils.readlink(absDest) != relSrc):
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try:
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# remove existing file first, since it might be read-only
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if os.path.lexists(absDest):
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@ -2315,10 +2315,10 @@ class Project(object):
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print("Retrying clone after deleting %s" %
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self.gitdir, file=sys.stderr)
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try:
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platform_utils.rmtree(os.path.realpath(self.gitdir))
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if self.worktree and os.path.exists(os.path.realpath
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platform_utils.rmtree(platform_utils.realpath(self.gitdir))
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if self.worktree and os.path.exists(platform_utils.realpath
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(self.worktree)):
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platform_utils.rmtree(os.path.realpath(self.worktree))
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platform_utils.rmtree(platform_utils.realpath(self.worktree))
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return self._InitGitDir(mirror_git=mirror_git, force_sync=False)
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except:
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raise e
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@ -2370,7 +2370,7 @@ class Project(object):
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self._InitHooks()
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def _InitHooks(self):
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hooks = os.path.realpath(self._gitdir_path('hooks'))
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hooks = platform_utils.realpath(self._gitdir_path('hooks'))
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if not os.path.exists(hooks):
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os.makedirs(hooks)
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for stock_hook in _ProjectHooks():
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@ -2386,7 +2386,7 @@ class Project(object):
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continue
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dst = os.path.join(hooks, name)
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if os.path.islink(dst):
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if platform_utils.islink(dst):
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continue
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if os.path.exists(dst):
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if filecmp.cmp(stock_hook, dst, shallow=False):
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@ -2448,9 +2448,9 @@ class Project(object):
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symlink_dirs += self.working_tree_dirs
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to_symlink = symlink_files + symlink_dirs
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for name in set(to_symlink):
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dst = os.path.realpath(os.path.join(destdir, name))
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dst = platform_utils.realpath(os.path.join(destdir, name))
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if os.path.lexists(dst):
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src = os.path.realpath(os.path.join(srcdir, name))
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src = platform_utils.realpath(os.path.join(srcdir, name))
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# Fail if the links are pointing to the wrong place
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if src != dst:
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_error('%s is different in %s vs %s', name, destdir, srcdir)
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@ -2482,10 +2482,10 @@ class Project(object):
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if copy_all:
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to_copy = os.listdir(gitdir)
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dotgit = os.path.realpath(dotgit)
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dotgit = platform_utils.realpath(dotgit)
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for name in set(to_copy).union(to_symlink):
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try:
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src = os.path.realpath(os.path.join(gitdir, name))
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src = platform_utils.realpath(os.path.join(gitdir, name))
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dst = os.path.join(dotgit, name)
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if os.path.lexists(dst):
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@ -2498,7 +2498,7 @@ class Project(object):
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if name in to_symlink:
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platform_utils.symlink(
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os.path.relpath(src, os.path.dirname(dst)), dst)
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elif copy_all and not os.path.islink(dst):
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elif copy_all and not platform_utils.islink(dst):
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if os.path.isdir(src):
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shutil.copytree(src, dst)
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elif os.path.isfile(src):
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@ -2556,7 +2556,7 @@ class Project(object):
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raise
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def _gitdir_path(self, path):
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return os.path.realpath(os.path.join(self.gitdir, path))
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return platform_utils.realpath(os.path.join(self.gitdir, path))
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def _revlist(self, *args, **kw):
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a = []
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@ -498,7 +498,7 @@ later is required to fix a server side protocol bug.
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dirs_to_remove += [os.path.join(root, d) for d in dirs
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if os.path.join(root, d) not in dirs_to_remove]
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for d in reversed(dirs_to_remove):
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if os.path.islink(d):
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if platform_utils.islink(d):
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try:
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os.remove(d)
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except OSError:
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