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#!/usr/bin/python3
# Copyright 2021 Simon McVittie
# SPDX-License-Identifier: MIT
'''
Inspect libffi-dev:$DEB_HOST_ARCH and print the corresponding library ABI
name, e.g. "local:libffiN=libffi8".
'''
import os
import subprocess
import debian.deb822
if __name__ == '__main__':
deb_host_arch = os.environ['DEB_HOST_ARCH']
result = subprocess.run(
['dpkg-query', '-s', 'libffi-dev:' + deb_host_arch],
stdout=subprocess.PIPE,
check=True,
)
stanza = result.stdout.decode('utf-8') # type: ignore
fields = debian.deb822.Packages(stanza)
libffiN = ''
for dependency in fields.relations['depends']:
for alternative in dependency:
if (
alternative['name'].startswith('libffi')
and alternative['name'][6].isdigit()
):
if libffiN != '':
raise AssertionError(
'More than one libffiN dependency in libffi-dev'
)
libffiN = alternative['name']
if not libffiN:
raise AssertionError(
'No libffiN dependency in libffi-dev'
)
print('local:libffiN=' + libffiN)
for suffix in ('ARCH_OS', 'GNU_TYPE', 'MULTIARCH'):
var = 'DEB_HOST_' + suffix
substvar = var.replace('_', '-')
print(f'local:{substvar}={os.environ[var]}')
for suffix in ('GNU_TYPE',):
var = 'DEB_HOST_' + suffix
substvar = var.replace('_', '-') + '-DASHES'
value = os.environ[var].replace('_', '-')
print(f'local:{substvar}={value}')
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