vars: Improve logging for migration

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

@@ -80,6 +80,7 @@ class StoreBase(ABC):
         generator: "Generator",
         var: "Var",
         value: bytes,
+        is_migration: bool = False,
     ) -> Path | None:
         if self.exists(generator, var.name):
             if self.is_secret_store:
@@ -92,15 +93,15 @@ class StoreBase(ABC):
             old_val = None
             old_val_str = "<not set>"
         new_file = self._set(generator, var, value)
+        action_str = "Migrated" if is_migration else "Updated"
         if self.is_secret_store:
-            print(f"Updated secret var {generator.name}/{var.name}\n")
+            print(f"{action_str} secret var {generator.name}/{var.name}\n")
         else:
             if value != old_val:
-                print(
-                    f"Updated var {generator.name}/{var.name}\n"
-                    f"  old: {old_val_str}\n"
-                    f"  new: {string_repr(value)}"
-                )
+                msg = f"{action_str} var {generator.name}/{var.name}"
+                if not is_migration:
+                    msg += f"\n  old: {old_val_str}\n  new: {string_repr(value)}"
+                print(msg)
             else:
                 print(
                     f"Var {generator.name}/{var.name} remains unchanged: {old_val_str}"

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

@@ -315,10 +315,10 @@ def _migrate_file(
 
     if file.secret:
         old_value = machine.secret_facts_store.get(service_name, fact_name)
-        machine.secret_vars_store.set(generator, file, old_value)
+        machine.secret_vars_store.set(generator, file, old_value, is_migration=True)
     else:
         old_value = machine.public_facts_store.get(service_name, fact_name)
-        machine.public_vars_store.set(generator, file, old_value)
+        machine.public_vars_store.set(generator, file, old_value, is_migration=True)
 
 
 def _migrate_files(

pkgs/clan-cli/tests/test_vars.py

@@ -842,6 +842,7 @@ def test_migration(
     monkeypatch: pytest.MonkeyPatch,
     flake: ClanFlake,
     sops_setup: SopsSetup,
+    capture_output: CaptureOutput,
 ) -> None:
     config = flake.machines["my_machine"]
     config["nixpkgs"]["hostPlatform"] = "x86_64-linux"
@@ -860,7 +861,10 @@ def test_migration(
     monkeypatch.chdir(flake.path)
     sops_setup.init()
     cli.run(["facts", "generate", "--flake", str(flake.path), "my_machine"])
+    with capture_output as output:
         cli.run(["vars", "generate", "--flake", str(flake.path), "my_machine"])
+    assert "Migrated var my_generator/my_value" in output.out
+    assert "Migrated secret var my_generator/my_secret" in output.out
     in_repo_store = in_repo.FactStore(
         Machine(name="my_machine", flake=FlakeId(str(flake.path)))
     )