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64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
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# Copyright (C) 2016 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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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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kernel32 = WinDLL('kernel32', use_last_error=True)
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# Win32 error codes
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ERROR_SUCCESS = 0
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ERROR_PRIVILEGE_NOT_HELD = 1314
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# Win32 API entry points
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CreateSymbolicLinkW = kernel32.CreateSymbolicLinkW
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CreateSymbolicLinkW.restype = BOOL
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CreateSymbolicLinkW.argtypes = (LPCWSTR, # lpSymlinkFileName In
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LPCWSTR, # lpTargetFileName In
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DWORD) # dwFlags In
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# Symbolic link creation flags
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SYMBOLIC_LINK_FLAG_FILE = 0x00
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SYMBOLIC_LINK_FLAG_DIRECTORY = 0x01
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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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_create_symlink(source, link_name, SYMBOLIC_LINK_FLAG_FILE)
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def create_dirsymlink(source, link_name):
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"""Creates a Windows directory symbolic link source pointing to link_name.
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"""
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_create_symlink(source, link_name, SYMBOLIC_LINK_FLAG_DIRECTORY)
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def _create_symlink(source, link_name, dwFlags):
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# Note: Win32 documentation for CreateSymbolicLink is incorrect.
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# On success, the function returns "1".
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# On error, the function returns some random value (e.g. 1280).
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# The best bet seems to use "GetLastError" and check for error/success.
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CreateSymbolicLinkW(link_name, source, dwFlags)
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code = get_last_error()
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if code != ERROR_SUCCESS:
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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(code, error_desc)
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