For either(oneOf) types, we skip introspection as we cannot
determine which branch of the union was taken without more context
This *should* be safe, as it can currently mostly be triggered through
The `extraModules` setting of inventory modules.
Example:
```
importer.roles.default.extraModules = [
../../modules/nixos/common.nix
];
```
Error Message:
```
Traceback (most recent call last):
File "/nix/store/zaz4r4fic03m4whgz46p5jjszzlkq694-clan-cli/lib/python3.13/site-packages/clan_lib/templates/handler.py", line 91, in machine_template
yield dst_machine_dir
File "/nix/store/zaz4r4fic03m4whgz46p5jjszzlkq694-clan-cli/lib/python3.13/site-packages/clan_cli/machines/create.py", line 95, in create_machine
inventory_store.write(inventory, message=f"machine '{machine_name}'")
~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/nix/store/zaz4r4fic03m4whgz46p5jjszzlkq694-clan-cli/lib/python3.13/site-packages/clan_lib/persist/inventory_store.py", line 269, in write
write_info = self._write_map()
File "/nix/store/zaz4r4fic03m4whgz46p5jjszzlkq694-clan-cli/lib/python3.13/site-packages/clan_lib/persist/inventory_store.py", line 214, in _write_map
current_priority = self._get_inventory_current_priority()
File "/nix/store/zaz4r4fic03m4whgz46p5jjszzlkq694-clan-cli/lib/python3.13/site-packages/clan_lib/persist/inventory_store.py", line 206, in _get_inventory_current_priority
return self._flake.select("clanInternals.inventoryClass.introspection")
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/nix/store/zaz4r4fic03m4whgz46p5jjszzlkq694-clan-cli/lib/python3.13/site-packages/clan_lib/flake/flake.py", line 1129, in select
self.get_from_nix([selector])
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
File "/nix/store/zaz4r4fic03m4whgz46p5jjszzlkq694-clan-cli/lib/python3.13/site-packages/clan_lib/flake/flake.py", line 1054, in get_from_nix
raise ClanSelectError(
...<3 lines>...
) from e
clan_lib.flake.flake.ClanSelectError: Error on: $ clan select 'clanInternals.inventoryClass.introspection'
Reason: Yet Unsupported type: either
Removing left-over machine directory: /tmp/hyperconfig/machines/trooo
Error on: $ clan select 'clanInternals.inventoryClass.introspection'
Reason: Yet Unsupported type: either
```
Closes: #5387
Add documentation explaining that services defining vars need to run
update-vars before tests can execute. Clarifies how `clan.directory`
determines where vars are generated and loaded from during testing.
Closes: #5380
Resolves the "RuntimeError: generator didn't stop after throw()" issue
by replacing the generator-based @contextmanager with an explicit class.
This maintains backward compatibility through a factory function.
