Function unpack_deps

Platforms/Apple/__main__.py:297–338

Unpack binary dependencies into a provided directory. Downloads binaries if they aren't already present. Downloads will be stored in provided cache directory. On iOS, as a safety mechanism, any dynamic libraries will be purged from the unpacked dependencies.

(
    platform: str,
    host: str,
    prefix_dir: Path,
    cache_dir: Path,
)

def unpack_deps(
    platform: str,
    host: str,
    prefix_dir: Path,
    cache_dir: Path,
) -> None:
    """Unpack binary dependencies into a provided directory.

    Downloads binaries if they aren't already present. Downloads will be stored
    in provided cache directory.

    On iOS, as a safety mechanism, any dynamic libraries will be purged from
    the unpacked dependencies.
    """
    # To create new builds of these dependencies, usually all that's necessary
    # is to push a tag to the cpython-apple-source-deps repository, and GitHub
    # Actions will do the rest.
    #
    # If you're a member of the Python core team, and you'd like to be able to
    # push these tags yourself, please contact Malcolm Smith or Russell
    # Keith-Magee.
    deps_url = "https://github.com/beeware/cpython-apple-source-deps/releases/download"
    for name_ver in [
        "BZip2-1.0.8-2",
        "libFFI-3.4.7-2",
        "OpenSSL-3.5.5-1",
        "XZ-5.6.4-2",
        "mpdecimal-4.0.0-2",
        "zstd-1.5.7-1",
    ]:
        filename = f"{name_ver.lower()}-{apple_target(host)}.tar.gz"
        archive_path = download(
            f"{deps_url}/{name_ver}/{filename}",
            target_dir=cache_dir,
        )
        shutil.unpack_archive(archive_path, prefix_dir)

    # Dynamic libraries will be preferentially linked over static;
    # On iOS, ensure that no dylibs are available in the prefix folder.
    if platform == "iOS":
        for dylib in prefix_dir.glob("**/*.dylib"):
            dylib.unlink()


def download(url: str, target_dir: Path) -> Path: