Python based cross-platform build scripts

build.py

import subprocess
import os
from pathlib import Path

def initialize_globals():
    globals()['prefix'] = os.environ.get('PREFIX')
    globals()['target_platform'] = os.environ.get('TARGET_PLATFORM')
    globals()['src_dir'] = Path(os.environ.get('SRC_DIR'))
    globals()['recipe_dir'] = Path(os.environ.get('RECIPE_DIR'))


initialize_globals()

run = subprocess.check_call

class RecipeBase:
    workdir = src_dir

    def __init__(self):
        pass

    def pre_configure(self):
        pass

    def configure(self):
        args = [str(x) for x in [self.configure_cmd] + self.get_default_configure_args() + self.configure_args]
        run(
            args,
            cwd=self.workdir,
        )

    def build(self):
        pass

    def install(self):
        pass

    def post_install(self):
        pass

    def get_default_configure_args(self):
        return self.default_configure_args

class CMake(RecipeBase):
    configure_cmd = "cmake"
    build_cmd = "ninja"
    cmakelists_dir = src_dir

    default_configure_args = [
      f'-DCMAKE_INSTALL_PREFIX={prefix}',
      f'-DCMAKE_PREFIX_PATH={prefix}',
      '-DCMAKE_INSTALL_LIBDIR=lib',
      '-GNinja',
    ]

    default_args = []

    def get_default_configure_args(self):
        return self.default_configure_args + [self.cmakelists_dir]

    def pre_configure(self):
        build_dir = self.workdir / "build"
        build_dir.mkdir(parents=True, exist_ok=True)
        self.workdir = build_dir

    def build(self):
        run(self.build_cmd, cwd=self.workdir)

    def install(self):
        run([self.build_cmd, "install"], cwd=self.workdir)


class Recipe(CMake):
    # workdir = 
    cmakelists_dir = src_dir / "build" / "cmake"

    configure_args = [
        '-DZSTD_LEGACY_SUPPORT=ON',
        '-DZSTD_BUILD_PROGRAMS=OFF',
        '-DZSTD_BUILD_CONTRIB=OFF',
        '-DZSTD_PROGRAMS_LINK_SHARED=ON'
    ]

    def pre_configure(self):
        build_dir = self.workdir / "cmake_build"
        build_dir.mkdir(parents=True, exist_ok=True)
        self.workdir = build_dir

    def __init__(self):
        pass


if __name__ == '__main__':

    r = Recipe()

    r.pre_configure()
    r.configure()
    r.build()
    r.install()
    r.post_install()