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borg/setup_crypto.py

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# Support code for building a C extension with crypto code
import os
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]
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def crypto_ext_kwargs(pc):
system_prefix = os.environ.get('BORG_OPENSSL_PREFIX')
if system_prefix:
print('Detected OpenSSL [via BORG_OPENSSL_PREFIX]')
return dict(include_dirs=[os.path.join(system_prefix, 'include')],
library_dirs=[os.path.join(system_prefix, 'lib')],
libraries=['crypto'])
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if pc and pc.exists('libcrypto'):
print('Detected OpenSSL [via pkg-config]')
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return pc.parse('libcrypto')
raise Exception('Could not find OpenSSL lib/headers, please set BORG_OPENSSL_PREFIX')
# b2 files, structure as seen in BLAKE2 (reference implementation) project repository:
# path relative (to this file) to the bundled library source code files
b2_bundled_path = 'src/borg/algorithms/blake2'
b2_sources = [
'ref/blake2b-ref.c',
]
b2_includes = [
'ref',
]
def b2_ext_kwargs(pc, prefer_system):
if prefer_system:
system_prefix = os.environ.get('BORG_LIBB2_PREFIX')
if system_prefix:
print('Detected and preferring libb2 [via BORG_LIBB2_PREFIX]')
return dict(include_dirs=[os.path.join(system_prefix, 'include')],
library_dirs=[os.path.join(system_prefix, 'lib')],
libraries=['b2'])
if pc and pc.installed('libb2', '>= 0.98.1'):
print('Detected and preferring libb2 [via pkg-config]')
return pc.parse('libb2')
print('Using bundled BLAKE2')
sources = multi_join(b2_sources, b2_bundled_path)
include_dirs = multi_join(b2_includes, b2_bundled_path)
define_macros = [('BORG_USE_BUNDLED_B2', 'YES')]
return dict(sources=sources, include_dirs=include_dirs, define_macros=define_macros)