use uv for creating virtual environments and installing packages when…

… available

tests/requirements.txt

@@ -1,5 +1,5 @@
 -e ..
-virtualenv
+uv
 maturin==1.5.0
 pytest
 junit2html

tests/runner.py

@@ -100,16 +100,33 @@ def _run_test_in_environment(
         sys.exit(proc.returncode)
 
 
+def _pip_install_command(interpreter_path: Path) -> list[str]:
+    if shutil.which("uv") is not None:
+        log.info("using uv to install packages")
+        return [
+            "uv",
+            "pip",
+            "install",
+            "--python",
+            str(interpreter_path),
+        ]
+    else:
+        log.info("using pip to install packages")
+        return [
+            str(interpreter_path),
+            "-m",
+            "pip",
+            "install",
+            "--disable-pip-version-check",
+        ]
+
+
 def _create_test_venv(python: Path, venv_dir: Path) -> VirtualEnv:
     venv = VirtualEnv.new(venv_dir, python)
     log.info("installing test requirements into virtualenv")
     proc = subprocess.run(
         [
-            str(venv.interpreter_path),
-            "-m",
-            "pip",
-            "install",
-            "--disable-pip-version-check",
+            *_pip_install_command(venv.interpreter_path),
             "-r",
             "requirements.txt",
         ],
@@ -120,13 +137,25 @@ def _create_test_venv(python: Path, venv_dir: Path) -> VirtualEnv:
     if proc.returncode != 0:
         log.error(proc.stdout.decode())
         log.error(proc.stderr.decode())
-        msg = "pip install failed"
+        msg = "package installation failed"
         raise RuntimeError(msg)
     log.debug("%s", proc.stdout.decode())
     log.info("test environment ready")
     return venv
 
 
+def _create_virtual_env_command(interpreter_path: Path, venv_path: Path) -> list[str]:
+    if shutil.which("uv") is not None:
+        log.info("using uv to create virtual environments")
+        return ["uv", "venv", "--seed", "--python", str(interpreter_path), str(venv_path)]
+    elif shutil.which("virtualenv") is not None:
+        log.info("using virtualenv to create virtual environments")
+        return ["virtualenv", "--python", str(interpreter_path), str(venv_path)]
+    else:
+        log.info("using venv to create virtual environments")
+        return [str(interpreter_path), "-m", "venv", str(venv_path)]
+
+
 class VirtualEnv:
     def __init__(self, root: Path) -> None:
         self._root = root.resolve()
@@ -140,7 +169,7 @@ def new(root: Path, interpreter_path: Path) -> VirtualEnv:
         if not interpreter_path.exists():
             raise FileNotFoundError(interpreter_path)
         log.info("creating test virtualenv at '%s' from '%s'", root, interpreter_path)
-        cmd = ["virtualenv", "--python", str(interpreter_path), str(root)]
+        cmd = _create_virtual_env_command(interpreter_path, root)
         proc = subprocess.run(cmd, capture_output=True, check=True)
         log.debug("%s", proc.stdout.decode())
         assert root.is_dir()

tests/test_import_hook/test_project_importer.py

@@ -1342,30 +1342,47 @@ def _rebuilt_message(project_name: str) -> str:
     return f'rebuilt and loaded package "{with_underscores(project_name)}"'
 
 
+_UV_AVAILABLE = None
+
+
+def uv_available() -> bool:
+    """whether the `uv` command is installed"""
+    global _UV_AVAILABLE
+    if _UV_AVAILABLE is None:
+        _UV_AVAILABLE = shutil.which("uv") is not None
+    return _UV_AVAILABLE
+
+
 def _uninstall(*project_names: str) -> None:
     log.info("uninstalling %s", sorted(project_names))
-    subprocess.check_call([
-        sys.executable,
-        "-m",
-        "pip",
-        "uninstall",
-        "--disable-pip-version-check",
-        "-y",
-        *project_names,
-    ])
+    if uv_available():
+        cmd = ["uv", "pip", "uninstall", "--python", str(sys.executable), *project_names]
+    else:
+        cmd = [
+            sys.executable,
+            "-m",
+            "pip",
+            "uninstall",
+            "--disable-pip-version-check",
+            "-y",
+            *project_names,
+        ]
+    subprocess.check_call(cmd)
 
 
 def _get_installed_package_names() -> set[str]:
-    packages = json.loads(
-        subprocess.check_output([
+    if uv_available():
+        cmd = ["uv", "pip", "list", "--python", sys.executable, "--format", "json"]
+    else:
+        cmd = [
             sys.executable,
             "-m",
             "pip",
             "--disable-pip-version-check",
             "list",
             "--format=json",
-        ]).decode()
-    )
+        ]
+    packages = json.loads(subprocess.check_output(cmd).decode())
     return {package["name"] for package in packages}
 
 
@@ -1382,7 +1399,11 @@ def _install_editable(project_dir: Path) -> None:
 
 def _install_non_editable(project_dir: Path) -> None:
     log.info("installing %s in non-editable mode", project_dir.name)
-    subprocess.check_call([sys.executable, "-m", "pip", "install", "--disable-pip-version-check", str(project_dir)])
+    if uv_available():
+        cmd = ["uv", "pip", "install", "--python", sys.executable, str(project_dir)]
+    else:
+        cmd = [sys.executable, "-m", "pip", "install", "--disable-pip-version-check", str(project_dir)]
+    subprocess.check_call(cmd)
 
 
 def _is_installed_as_pth(project_name: str) -> bool:
@@ -1415,14 +1436,20 @@ def _is_editable_installed_correctly(project_name: str, project_dir: Path, is_mi
         installed_editable_with_direct_url,
     )
 
+    if uv_available():
+        # TODO(matt): use uv once the --files option is supported https://github.com/astral-sh/uv/issues/2526
+        cmd = [sys.executable, "-m", "pip", "show", "--disable-pip-version-check", "-f", project_name]
+    else:
+        cmd = [sys.executable, "-m", "pip", "show", "--disable-pip-version-check", "-f", project_name]
+
     proc = subprocess.run(
-        [sys.executable, "-m", "pip", "show", "--disable-pip-version-check", "-f", project_name],
+        cmd,
         stdout=subprocess.PIPE,
         stderr=subprocess.STDOUT,
         check=False,
     )
     output = "None" if proc.stdout is None else proc.stdout.decode()
-    log.info("pip output (returned %s):\n%s", proc.returncode, output)
+    log.info("command output (returned %s):\n%s", proc.returncode, output)
     return installed_editable_with_direct_url and (installed_as_pth == is_mixed)