Function pyodide_setup

scripts/test.py:1217–1302

Returns a command that will set things up for a pyodide build. Args: directory: Our command cd's into this directory. clean: If true we create an entirely new environment. Otherwise we reuse any existing emsdk repository and venv.

(
        directory,
        clean=False,
        pyodide_build_version=None,
        )

def pyodide_setup(
        directory,
        clean=False,
        pyodide_build_version=None,
        ):
    '''
    Returns a command that will set things up for a pyodide build.
    
    Args:
        directory:
            Our command cd's into this directory.
        clean:
            If true we create an entirely new environment. Otherwise
            we reuse any existing emsdk repository and venv.
        pyodide_build_version:
            Version of Python package pyodide-build; if None we use latest
            available version.
            2025-02-13: pyodide_build_version='0.29.3' works.
    
    The returned command does the following:
    
    * Checkout latest emsdk from https://github.com/emscripten-core/emsdk.git:
      * Clone emsdk repository to `emsdk` if not already present.
      * Run `git pull -r` inside emsdk checkout.
    * Create venv `venv_pyodide_<python_version>` if not already present.
    * Activate venv `venv_pyodide_<python_version>`.
    * Install/upgrade package `pyodide-build`.
    * Run emsdk install scripts and enter emsdk environment.
    
    Example usage in a build function:
    
        command = pyodide_setup()
        command += ' && pyodide build --exports pyinit'
        subprocess.run(command, shell=1, check=1)
    ''&#x27;
    
    pv = platform.python_version_tuple()[:2]
    assert pv == ('3', '12'), f'Pyodide builds need to be run with Python-3.12 but current Python is {platform.python_version()}.'
    command = f'cd {directory}'
    
    # Clone/update emsdk. We always use the latest emsdk with `git pull`.
    #
    # 2025-02-13: this works: 2514ec738de72cebbba7f4fdba0cf2fabcb779a5
    #
    dir_emsdk = 'emsdk'
    if clean:
        shutil.rmtree(dir_emsdk, ignore_errors=1)
        # 2024-06-25: old `.pyodide-xbuildenv` directory was breaking build, so
        # important to remove it here.
        shutil.rmtree('.pyodide-xbuildenv', ignore_errors=1)
    if not os.path.exists(f'{directory}/{dir_emsdk}'):
        command += f' && echo "### Cloning emsdk.git"'
        command += f' && git clone https://github.com/emscripten-core/emsdk.git {dir_emsdk}'
    command += f' && echo "### Updating checkout {dir_emsdk}"'
    command += f' && (cd {dir_emsdk} && git pull -r)'
    command += f' && echo "### Checkout {dir_emsdk} is:"'
    command += f' && (cd {dir_emsdk} && git show -s --oneline)'