Conan: KeyError USERDOMAIN on `conan install`

[olivren]

We have at least two machines for which conan install errors out with the message:

Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\conans\client\command.py", line 1187, in run
    method(args[0][1:])
  File "C:\Python27\lib\site-packages\conans\client\command.py", line 304, in install
    install_folder=args.install_folder)
  File "C:\Python27\lib\site-packages\conans\client\conan_api.py", line 61, in wrapper
    return f(*args, **kwargs)
  File "C:\Python27\lib\site-packages\conans\client\conan_api.py", line 444, in install
    no_imports=no_imports)
  File "C:\Python27\lib\site-packages\conans\client\manager.py", line 395, in install
    installer.install(deps_graph, profile.build_requires, keep_build)
  File "C:\Python27\lib\site-packages\conans\client\installer.py", line 262, in install
    nodes_to_process = self._get_nodes(nodes_by_level, skip_private_nodes)
  File "C:\Python27\lib\site-packages\conans\client\installer.py", line 501, in _get_nodes
    check_outdated)
  File "C:\Python27\lib\site-packages\conans\client\proxy.py", line 47, in package_available
    package_folder = self._client_cache.package(package_ref, short_paths=short_paths)
  File "C:\Python27\lib\site-packages\conans\paths.py", line 162, in package
    return path_shortener(p, short_paths)
  File "C:\Python27\lib\site-packages\conans\util\windows.py", line 57, in path_shortener
    cmd = r'cacls %s /E /G "%s\%s":F' % (short_home, os.environ['USERDOMAIN'], os.environ['USERNAME'])
  File "C:\Python27\lib\os.py", line 425, in __getitem__
    return self.data[key.upper()]
KeyError: 'USERDOMAIN'

Defining an environment variable USERDOMAIN to any value fixes the problem.

Both machines are Windows 7, with Conan 1.2.3.

[memsharded]

Yes, this is a bug, will be fixed in next release.
Thanks for telling!

[olivren]

I'm always impressed by your reactivity for fixing bugs. Cheers!