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# -*- coding: utf-8 -*-
#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2015 Jérémy Bobbio <lunar@debian.org>
# 2016-2017 Mattia Rizzolo <mattia@debian.org>
#
# diffoscope is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# diffoscope is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with diffoscope. If not, see <https://www.gnu.org/licenses/>.
import pytest
import functools
import importlib
import subprocess
from distutils.spawn import find_executable
from distutils.version import LooseVersion
def tools_missing(*required):
return not required or any(find_executable(x) is None for x in required)
def skip_unless_tools_exist(*required):
return pytest.mark.skipif(
tools_missing(*required),
reason="requires {}".format(" and ".join(required)),
)
def skip_unless_tool_is_at_least(tool, actual_ver, min_ver, vcls=LooseVersion):
if tools_missing(tool):
return pytest.mark.skipif(True, reason="requires {}".format(tool))
if callable(actual_ver):
actual_ver = actual_ver()
return pytest.mark.skipif(
vcls(str(actual_ver)) < vcls(str(min_ver)),
reason="requires {} >= {} ({} detected)".format(tool, min_ver, actual_ver)
)
def skip_if_binutils_does_not_support_x86():
if tools_missing('objdump'):
return skip_unless_tools_exist('objdump')
return pytest.mark.skipif(
'elf64-x86-64' not in get_supported_elf_formats(),
reason="requires a binutils capable of reading x86-64 binaries"
)
@functools.lru_cache()
def get_supported_elf_formats():
return set(subprocess.check_output(
('objdump', '--info'),
).decode('utf-8').splitlines())
def skip_unless_module_exists(name):
def module_does_not_exist(x):
try:
return importlib.util.find_spec(x) is None
except ImportError:
# Probing for submodules (eg. ``debian.deb822``) will attempt to
# import ``debian`` so we must handle that failing.
return True
return pytest.mark.skipif(
module_does_not_exist(name),
reason="requires {} module".format(name),
)
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