nixos-rebuild-ng: use Path.resolve() instead of readlink() (#384060)

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

@@ -140,8 +140,7 @@ class Flake:
                 default_path = Path("/etc/nixos/flake.nix")
                 if default_path.exists():
                     # It can be a symlink to the actual flake.
-                    if default_path.is_symlink():
-                        default_path = default_path.readlink()
+                    default_path = default_path.resolve()
                     return cls.parse(str(default_path.parent), get_hostname)
                 else:
                     return None

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

@@ -140,7 +140,7 @@ def test_flake_from_arg(
             return_value=True,
         ),
         patch(
-            get_qualified_name(m.Path.readlink, m),
+            get_qualified_name(m.Path.resolve, m),
             autospec=True,
             return_value=Path("/path/to/flake.nix"),
         ),