add jaraco to test sym links on Windows. Fixes #894

libs/jaraco/windows/security.py

@@ -0,0 +1,58 @@
+import ctypes.wintypes
+
+from jaraco.windows.error import handle_nonzero_success
+from .api import security
+
+def GetTokenInformation(token, information_class):
+	"""
+	Given a token, get the token information for it.
+	"""
+	data_size = ctypes.wintypes.DWORD()
+	ctypes.windll.advapi32.GetTokenInformation(token, information_class.num,
+		0, 0, ctypes.byref(data_size))
+	data = ctypes.create_string_buffer(data_size.value)
+	handle_nonzero_success(ctypes.windll.advapi32.GetTokenInformation(token,
+		information_class.num,
+		ctypes.byref(data), ctypes.sizeof(data),
+		ctypes.byref(data_size)))
+	return ctypes.cast(data, ctypes.POINTER(security.TOKEN_USER)).contents
+
+def OpenProcessToken(proc_handle, access):
+	result = ctypes.wintypes.HANDLE()
+	proc_handle = ctypes.wintypes.HANDLE(proc_handle)
+	handle_nonzero_success(ctypes.windll.advapi32.OpenProcessToken(
+		proc_handle, access, ctypes.byref(result)))
+	return result
+
+def get_current_user():
+	"""
+	Return a TOKEN_USER for the owner of this process.
+	"""
+	process = OpenProcessToken(
+		ctypes.windll.kernel32.GetCurrentProcess(),
+		security.TokenAccess.TOKEN_QUERY,
+	)
+	return GetTokenInformation(process, security.TOKEN_USER)
+
+def get_security_attributes_for_user(user=None):
+	"""
+	Return a SECURITY_ATTRIBUTES structure with the SID set to the
+	specified user (uses current user if none is specified).
+	"""
+	if user is None:
+		user = get_current_user()
+
+	assert isinstance(user, security.TOKEN_USER), "user must be TOKEN_USER instance"
+
+	SD = security.SECURITY_DESCRIPTOR()
+	SA = security.SECURITY_ATTRIBUTES()
+	# by attaching the actual security descriptor, it will be garbage-
+	# collected with the security attributes
+	SA.descriptor = SD
+	SA.bInheritHandle = 1
+
+	ctypes.windll.advapi32.InitializeSecurityDescriptor(ctypes.byref(SD),
+		security.SECURITY_DESCRIPTOR.REVISION)
+	ctypes.windll.advapi32.SetSecurityDescriptorOwner(ctypes.byref(SD),
+		user.SID, 0)
+	return SA