clan-cli: add update command

pkgs/clan-cli/tests/test_update.py

@@ -0,0 +1,35 @@
+import os
+import shutil
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+from environment import mock_env
+from host_group import HostGroup
+
+from clan_cli.update import deploy_nixos
+
+
+def test_update(clan_flake: Path, host_group: HostGroup) -> None:
+    assert len(host_group.hosts) == 1
+    host = host_group.hosts[0]
+
+    with TemporaryDirectory() as tmpdir:
+        host.meta["flake_uri"] = clan_flake
+        host.meta["flake_path"] = str(Path(tmpdir) / "rsync-target")
+        host.ssh_options["SendEnv"] = "REALPATH"
+        bin = Path(tmpdir).joinpath("bin")
+        bin.mkdir()
+        nixos_rebuild = bin.joinpath("nixos-rebuild")
+        bash = shutil.which("bash")
+        assert bash is not None
+        nixos_rebuild.write_text(
+            f"""#!{bash}
+exit 0
+"""
+        )
+        nixos_rebuild.chmod(0o755)
+        path = f"{tmpdir}/bin:{os.environ['PATH']}"
+        nix_state_dir = Path(tmpdir).joinpath("nix")
+        nix_state_dir.mkdir()
+        with mock_env(REALPATH=path):
+            deploy_nixos(host_group)