clan-cli: do not crash if a machine being deleted is missing from the inventory

We implement that by actually raising `KeyError` in `inventory.delete_by_path`
(as advertised in the docstring), since it makes more sense to catch a
`KeyError` than a generic `ClanError`.

pkgs/clan-cli/clan_cli/inventory/__init__.py

@@ -431,7 +431,7 @@ def delete_by_path(d: dict[str, Any], path: str) -> Any:
     """
     if not path:
         msg = "Cannot delete. Path is empty."
-        raise ClanError(msg)
+        raise KeyError(msg)
 
     keys = path.split(".")
     current = d
@@ -439,17 +439,17 @@ def delete_by_path(d: dict[str, Any], path: str) -> Any:
     # Navigate to the parent dictionary of the final key
     for key in keys[:-1]:
         if key not in current or not isinstance(current[key], dict):
-            msg = f"Cannot delete. Key '{path}' not found or not a dictionary '{d}'."
-            raise ClanError(msg)
+            msg = f"Cannot delete. Key '{path}' not found or not a dictionary '{d}'"
+            raise KeyError(msg)
         current = current[key]
 
     # Attempt to pop the final key
     last_key = keys[-1]
     try:
         value = current.pop(last_key)
-    except KeyError:
-        msg = f"Cannot delete. Path '{path}' not found in data '{d}'. "
-        raise ClanError(msg) from KeyError
+    except KeyError as exc:
+        msg = f"Cannot delete. Path '{path}' not found in data '{d}'"
+        raise KeyError(msg) from exc
     else:
         return {last_key: value}
 

pkgs/clan-cli/clan_cli/machines/delete.py

@@ -28,7 +28,16 @@ log = logging.getLogger(__name__)
 
 @API.register
 def delete_machine(flake: Flake, name: str) -> None:
-    inventory.delete(str(flake.path), {f"machines.{name}"})
+    try:
+        inventory.delete(str(flake.path), {f"machines.{name}"})
+    except KeyError as exc:
+        # louis@(2025-03-09): test infrastructure does not seem to set the
+        # inventory properly, but more importantly only one machine in my
+        # personal clan ended up in the inventory for some reason, so I think
+        # it makes sense to eat the exception here.
+        log.warning(
+            f"{name} was missing or already deleted from the machines inventory: {exc}"
+        )
 
     changed_paths: list[Path] = []