nixos-rebuild-ng: move list_generations to services.py

pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/__init__.py

@@ -1,5 +1,4 @@
 import argparse
-import json
 import logging
 import os
 import sys
@@ -10,8 +9,8 @@ from . import nix
 from .constants import EXECUTABLE, WITH_NIX_2_18, WITH_REEXEC, WITH_SHELL_FILES
 from .models import Action, BuildAttr, Flake, Profile
 from .process import Remote
-from .services import build_and_activate_system, reexec
-from .utils import LogFormatter, tabulate
+from .services import build_and_activate_system, list_generations, reexec
+from .utils import LogFormatter
 
 logger: Final = logging.getLogger(__name__)
 logger.setLevel(logging.INFO)
@@ -349,20 +348,7 @@ def execute(argv: list[str]) -> None:
             raise AssertionError("DRY_RUN should be a DRY_BUILD alias")
 
         case Action.LIST_GENERATIONS:
-            generations = nix.list_generations(profile)
-            if args.json:
-                print(json.dumps(generations, indent=2))
-            else:
-                headers = {
-                    "generation": "Generation",
-                    "date": "Build-date",
-                    "nixosVersion": "NixOS version",
-                    "kernelVersion": "Kernel",
-                    "configurationRevision": "Configuration Revision",
-                    "specialisations": "Specialisation",
-                    "current": "Current",
-                }
-                print(tabulate(generations, headers=headers))
+            list_generations(args, profile)
 
         case Action.REPL:
             if flake:

pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/services.py

@@ -1,4 +1,5 @@
 import argparse
+import json
 import logging
 import os
 import sys
@@ -10,7 +11,7 @@ from . import nix, tmpdir
 from .constants import EXECUTABLE
 from .models import Action, BuildAttr, Flake, ImageVariants, NixOSRebuildError, Profile
 from .process import Remote, cleanup_ssh
-from .utils import Args
+from .utils import Args, tabulate
 
 NIXOS_REBUILD_ATTR: Final = "config.system.build.nixos-rebuild"
 
@@ -315,3 +316,23 @@ def build_and_activate_system(
         common_flags=common_flags,
         flake_common_flags=flake_common_flags,
     )
+
+
+def list_generations(
+    args: argparse.Namespace,
+    profile: Profile,
+) -> None:
+    generations = nix.list_generations(profile)
+    if args.json:
+        print(json.dumps(generations, indent=2))
+    else:
+        headers = {
+            "generation": "Generation",
+            "date": "Build-date",
+            "nixosVersion": "NixOS version",
+            "kernelVersion": "Kernel",
+            "configurationRevision": "Configuration Revision",
+            "specialisations": "Specialisation",
+            "current": "Current",
+        }
+        print(tabulate(generations, headers=headers))