Fix Filelock usage to work with older versions. (#9)

Author: jsirois

CHANGES.md

@@ -1,5 +1,10 @@
 # Release Notes
 
+## 0.32.4
+
+This release brings compatility with older versions of `filelock` when installing `dev-cmd` with the
+`old-pythons` extra.
+
 ## 0.32.3
 
 This release switches from a bespoke lock embedding in dev-cmd distributuons to use of the

dev_cmd/__init__.py

@@ -1,4 +1,4 @@
 # Copyright 2024 John Sirois.
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-__version__ = "0.32.3"
+__version__ = "0.32.4"

dev_cmd/venv.py

@@ -111,6 +111,7 @@ def marker_environment(python: Python, quiet: bool = False) -> dict[str, str]:
     fingerprint = _fingerprint(resolved_python.encode())
     markers_file = _ensure_cache_dir() / "interpreters" / f"markers.{fingerprint}.json"
     if not os.path.exists(markers_file):
+        markers_file.parent.mkdir(parents=True, exist_ok=True)
         with (
             FileLock(f"{markers_file}.lck"),
             TemporaryDirectory(dir=markers_file.parent, prefix="packaging-venv.") as td,
@@ -245,6 +246,7 @@ def ensure(
     venv_dir = _ensure_cache_dir() / "venvs" / fingerprint
     layout_file = venv_dir / ".dev-cmd-venv-layout.json"
     if not os.path.exists(venv_dir):
+        venv_dir.parent.mkdir(parents=True, exist_ok=True)
         with FileLock(f"{venv_dir}.lck"):
             if not os.path.exists(venv_dir):
                 print(

pyproject.toml

@@ -5,6 +5,8 @@ requires = [
 
     # 1st support for license expressions was in setuptools 77.0.0.
     "setuptools>=77",
+
+    "uv",
 ]
 build-backend = "pex.build_backend.wrap"