nixosTestLib: fix various linting issues

pkgs/testing/nixos_test_lib/nix_setup.py

@@ -1,7 +1,6 @@
 """Nix store setup utilities for VM tests"""
 
 import os
-import shutil
 import subprocess
 from pathlib import Path
 
@@ -10,7 +9,8 @@ def setup_nix_in_nix(closure_info: str | None) -> None:
     """Set up Nix store inside test environment
 
     Args:
-        closure_info: Path to closure info directory containing store-paths file, or None if no closure info
+        closure_info: Path to closure info directory containing store-paths file,
+            or None if no closure info
     """
     tmpdir = Path(os.environ.get("TMPDIR", "/tmp"))
 
@@ -22,7 +22,7 @@ def setup_nix_in_nix(closure_info: str | None) -> None:
     os.environ["NIX_CONFIG"] = "substituters = \ntrusted-public-keys = "
 
     # Set up environment variables for test environment
-    os.environ["HOME"] = tmpdir
+    os.environ["HOME"] = str(tmpdir)
     os.environ["NIX_STATE_DIR"] = f"{tmpdir}/nix"
     os.environ["NIX_CONF_DIR"] = f"{tmpdir}/etc"
     os.environ["IN_NIX_SANDBOX"] = "1"
@@ -41,11 +41,12 @@ def setup_nix_in_nix(closure_info: str | None) -> None:
             with store_paths_file.open() as f:
                 store_paths = f.read().strip().split("\n")
 
-            # Copy store paths to test store using external cp command (handles symlinks better)
+            # Copy store paths to test store using external cp command
+            # (handles symlinks better)
             subprocess.run(
-                ["cp", "--recursive", "--target", f"{tmpdir}/store"] + 
-                [path.strip() for path in store_paths if path.strip()],
-                check=True
+                ["cp", "--recursive", "--target", f"{tmpdir}/store"]
+                + [path.strip() for path in store_paths if path.strip()],
+                check=True,
             )
 
             # Load Nix database

pkgs/testing/nixos_test_lib/port.py

@@ -23,7 +23,7 @@ def check_host_port_open(port: int) -> bool:
             s.settimeout(1)
             result = s.connect_ex(("localhost", port))
             return result == 0
-    except Exception as e:
+    except OSError as e:
         print(f"Port check failed: {e}")
         return False
 

pkgs/testing/nixos_test_lib/ssh.py

@@ -1,6 +1,7 @@
 """SSH and test setup utilities"""
 
 import subprocess
+from pathlib import Path
 from typing import NamedTuple
 
 from .nix_setup import setup_nix_in_nix
@@ -34,15 +35,14 @@ def setup_test_environment(
 
     setup_port_forwarding(target, host_port)
 
-    ssh_key = os.path.join(temp_dir, "id_ed25519")
-    with open(ssh_key, "w") as f:
-        with open(assets_ssh_privkey) as src:
-            f.write(src.read())
-    os.chmod(ssh_key, 0o600)
+    ssh_key = Path(temp_dir) / "id_ed25519"
+    with ssh_key.open("w") as f, Path(assets_ssh_privkey).open() as src:
+        f.write(src.read())
+    ssh_key.chmod(0o600)
 
     # Copy test flake to temp directory
-    flake_dir = os.path.join(temp_dir, "test-flake")
-    subprocess.run(["cp", "-r", clan_core_for_checks, flake_dir], check=True)
-    subprocess.run(["chmod", "-R", "+w", flake_dir], check=True)
+    flake_dir = Path(temp_dir) / "test-flake"
+    subprocess.run(["cp", "-r", clan_core_for_checks, flake_dir], check=True)  # noqa: S603, S607
+    subprocess.run(["chmod", "-R", "+w", flake_dir], check=True)  # noqa: S603, S607
 
-    return TestEnvironment(host_port, ssh_key, flake_dir)
+    return TestEnvironment(host_port, str(ssh_key), str(flake_dir))

pkgs/testing/pyproject.toml

@@ -41,4 +41,5 @@ ignore = [
     "ANN", # type annotations  
     "COM812", # trailing comma
     "ISC001", # string concatenation
+    "T201", # print statements
 ]