use uv to bootstrap the host system Python environment

.python-version

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+3.13

build-uv.py

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+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import os
+import pathlib
+import platform
+import subprocess
+import sys
+
+ROOT = pathlib.Path(os.path.abspath(__file__)).parent
+
+
+def run():
+    env = dict(os.environ)
+    env["PYTHONUNBUFFERED"] = "1"
+    python = sys.executable
+    system = platform.system()
+
+    if system == "Darwin" or system == "Linux":
+        args = [
+            python,
+            "build-main.py",
+            *sys.argv[1:],
+        ]
+        make_dir = ROOT / "cpython-unix"
+        os.chdir(make_dir)
+        return os.execve(python, args, env)
+    elif system == "Windows":
+        args = [
+            python,
+            "build.py",
+            *sys.argv[1:],
+        ]
+        cwd = str(ROOT / "cpython-windows")
+        return subprocess.run(args, cwd=cwd, env=env, check=True, bufsize=0)
+    else:
+        raise Exception(f"Unsupported host system: {system}")
+
+
+if __name__ == "__main__":
+    try:
+        run()
+    except subprocess.CalledProcessError as e:
+        sys.exit(e.returncode)

pyproject.toml

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+[project]
+name = "python-build-standalone"
+version = "0.1.0"
+description = "Produces standalone, highly-redistributable builds of Python."
+readme = "README.rst"
+requires-python = ">=3.10"
+dependencies = [
+    "docker",
+    "jinja2",
+    "jsonschema",
+    "pyyaml",
+    "tomli",
+    "typing-extensions",
+    "zstandard",
+]
+
+[build-system]
+requires = ["uv_build>=0.9.12,<0.10.0"]
+build-backend = "uv_build"
+
+[tool.uv.build-backend]
+module-name = "pythonbuild"
+module-root = ""