nixos-rebuild-ng: run upgrade_channels with sudo

Fix #424749.

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

@@ -281,7 +281,7 @@ def execute(argv: list[str]) -> None:
     copy_flags = common_flags | vars(args_groups["copy_flags"])
 
     if args.upgrade or args.upgrade_all:
-        nix.upgrade_channels(bool(args.upgrade_all))
+        nix.upgrade_channels(args.upgrade_all, args.sudo)
 
     action = Action(args.action)
     # Only run shell scripts from the Nixpkgs tree if the action is

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

@@ -693,7 +693,7 @@ def switch_to_configuration(
     )
 
 
-def upgrade_channels(all_channels: bool = False) -> None:
+def upgrade_channels(all_channels: bool = False, sudo: bool = False) -> None:
     """Upgrade channels for classic Nix.
 
     It will either upgrade just the `nixos` channel (including any channel
@@ -705,4 +705,8 @@ def upgrade_channels(all_channels: bool = False) -> None:
             or channel_path.name == "nixos"
             or (channel_path / ".update-on-nixos-rebuild").exists()
         ):
-            run_wrapper(["nix-channel", "--update", channel_path.name], check=False)
+            run_wrapper(
+                ["nix-channel", "--update", channel_path.name],
+                check=False,
+                sudo=sudo,
+            )

pkgs/by-name/ni/nixos-rebuild-ng/src/tests/test_nix.py

@@ -838,15 +838,19 @@ def test_switch_to_configuration_with_systemd_run(
 @patch("pathlib.Path.is_dir", autospec=True, return_value=True)
 def test_upgrade_channels(mock_is_dir: Mock, mock_glob: Mock) -> None:
     with patch(get_qualified_name(n.run_wrapper, n), autospec=True) as mock_run:
-        n.upgrade_channels(False)
-    mock_run.assert_called_once_with(["nix-channel", "--update", "nixos"], check=False)
+        n.upgrade_channels(all_channels=False, sudo=True)
+    mock_run.assert_called_once_with(
+        ["nix-channel", "--update", "nixos"], check=False, sudo=True
+    )
 
     with patch(get_qualified_name(n.run_wrapper, n), autospec=True) as mock_run:
-        n.upgrade_channels(True)
+        n.upgrade_channels(all_channels=True, sudo=False)
     mock_run.assert_has_calls(
         [
-            call(["nix-channel", "--update", "nixos"], check=False),
-            call(["nix-channel", "--update", "nixos-hardware"], check=False),
-            call(["nix-channel", "--update", "home-manager"], check=False),
+            call(["nix-channel", "--update", "nixos"], check=False, sudo=False),
+            call(
+                ["nix-channel", "--update", "nixos-hardware"], check=False, sudo=False
+            ),
+            call(["nix-channel", "--update", "home-manager"], check=False, sudo=False),
         ]
     )