setup_crypto.py

# Support code for building a C extension with crypto code

import os
import sys

is_win32 = sys.platform.startswith("win32")


def multi_join(paths, *path_segments):
    """apply os.path.join on a list of paths"""
    return [os.path.join(*(path_segments + (path,))) for path in paths]


def crypto_ext_kwargs(pc, system_prefix):
    if system_prefix:
        print("Detected OpenSSL [via BORG_OPENSSL_PREFIX]")
        if is_win32:
            lib_dir = system_prefix
            lib_name = "libcrypto"
        else:
            lib_dir = os.path.join(system_prefix, "lib")
            lib_name = "crypto"

        return dict(
            include_dirs=[os.path.join(system_prefix, "include")],
            library_dirs=[lib_dir],
            libraries=[lib_name],
        )

    if pc and pc.exists("libcrypto"):
        print("Detected OpenSSL [via pkg-config]")
        return pc.parse("libcrypto")

    raise Exception("Could not find OpenSSL lib/headers, please set BORG_OPENSSL_PREFIX")