python rez package.py that uses `rye` to download and deploy indygreg builds

package.py

name = "python"
version = "3.10.14"
authors = ["Guido van Rossum"]
description = "The Python programming language"

@early()
def variants():    
    import rez.package_py_utils as rezutils, platform
    p = 'platform-%s' % {'darwin':'osx','windows':'windows','linux':'linux'}[platform.system().lower()]
    return [rezutils.expand_requires(p, "arch-**")]


@early()
def tools():
    # conditionally enumerate python 2 / 3 tools
    maj, mnr = this.version.split('.')[0:2]
    pyver = '.'.join([maj, mnr])
    all_vers = ['python{0}', 'python{0}-config', 'pydoc{0}', 'pip{0}']
    py2_only = ['smtpd.py']
    py3_only = ['pyenv', 'idle3']
    tools = py2_only if int(maj) < 3 else py3_only
    variants = ['', maj, pyver]
    for tool in all_vers:
        for variant in variants:
            tools.append(tool.format(variant))
    return tools + ['2to3', 'idle']


@early()
def uuid():
    import uuid
    return str(uuid.uuid5(uuid.NAMESPACE_DNS, name))


def pre_build_commands():
    import platform
    is_windows = platform.system() == 'Windows'
    p = {'darwin':'macos','windows':'windows','linux':'linux'}[platform.system().lower()]
    arch = 'aarch64' if 'arm' in platform.machine() else 'x86_64'
    ext = 'exe' if is_windows else 'gz'
    archive = "rye-x86-windows.exe" if is_windows else f"rye-{arch}-{p}.{ext}"
    filename = f"rye" if not is_windows else "rye-x86-windows.exe"
    url = "https://github.com/astral-sh/rye/releases/latest/download/{archive}"
    download_cmd = "curl -SL --progress-bar %s --output %s" % (url, ("{build.build_path}/%s" % (filename if is_windows else "rye.gz")))
    pyver = '{this.version.major}.{this.version.minor}.{this.version.patch}'
    rye_cmd = "%s fetch cpython@%s --target-path=%s" % (filename, pyver, build.install_path)
    env.RYE_NO_AUTO_INSTALL = 1
    env.REZ_BUILD_DOWNLOAD_CMD = download_cmd
    env.REZ_BUILD_RYE_CMD = rye_cmd


build_command = """
rm -rf {install_path}
$REZ_BUILD_DOWNLOAD_CMD
if [ ! -f rye-x86-windows.exe ]; then
    gunzip rye.gz
    chmod +x rye
fi
$REZ_BUILD_RYE_CMD
if [ ! -f {install_path}/bin/python ]; then
    #cd {install_path}/bin
    ln -s {install_path}/bin/python{version.major}.{version.minor} {install_path}/bin/python
fi
"""

def pre_commands():
    from tempfile import gettempdir
    import os
    env.PYTHONHOME.unset()
    env.PYTHONPYCACHEPREFIX = os.path.join(gettempdir(), 'rez-pycache')

def commands():
    env.PATH.prepend("{root}/bin")

    if building:
        def abi_ext():
            import os
            libpythons = os.listdir(expandvars(os.path.join('$REZ_PYTHON_ROOT','lib')))
            abi_ext = sorted(list(filter(lambda x: 'libpython' in x, libpythons)), key=len)[-1].split('python')[-1][3:]
            abi = abi_ext.split('.')[0]
            ext = abi_ext.strip(abi).strip('.')
            return  (abi if not abi.isdigit() else '', ext)
        abi, ext = abi_ext()
        maj_min = '{this.version.major}.{this.version.minor}'
        env.PYTHON_VERSION_ABI =  maj_min + abi
        env.PYTHON_VERSION = env.PYTHON_VERSION_MAJOR_MINOR = maj_min
        env.Python_ROOT = '{root}'
        env.Python_LIBRARY = '{root}/lib/libpython{maj_min}{abi}.{ext}'
        env.Python_EXECUTABLE = '{root}/bin/python{maj_min}{abi}'
        env.Python_INCLUDE_DIR = '{root}/include/python{maj_min}{abi}'
        env.PKG_CONFIG_PATH.prepend('{root}/include/pkgconfig')