vars: make populate_dir a method of StoreBase

pkgs/clan-cli/clan_cli/vars/_types.py

@@ -152,3 +152,7 @@ class StoreBase(ABC):
         if target_hash is None and stored_hash is None:
             return True
         return stored_hash == target_hash
+
+    @abstractmethod
+    def populate_dir(self, output_dir: Path) -> None:
+        pass

pkgs/clan-cli/clan_cli/vars/public_modules/in_repo.py

@@ -49,3 +49,7 @@ class FactStore(StoreBase):
 
     def exists(self, generator: Generator, name: str) -> bool:
         return (self.directory(generator, name) / "value").exists()
+
+    def populate_dir(self, output_dir: Path) -> None:
+        msg = "populate_dir is not implemented for public vars stores"
+        raise NotImplementedError(msg)

pkgs/clan-cli/clan_cli/vars/public_modules/vm.py

@@ -47,3 +47,7 @@ class FactStore(StoreBase):
             return fact_path.read_bytes()
         msg = f"Fact {name} for service {generator.name} not found"
         raise ClanError(msg)
+
+    def populate_dir(self, output_dir: Path) -> None:
+        msg = "populate_dir is not implemented for public vars stores"
+        raise NotImplementedError(msg)