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#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2015 Jérémy Bobbio <lunar@debian.org>
# Copyright © 2016-2017 Mattia Rizzolo <mattia@debian.org>
# Copyright © 2019-2023 Chris Lamb <lamby@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 contextlib
import os
import re
import pytest
from diffoscope.comparators.binary import FilesystemFile
from diffoscope.comparators.directory import FilesystemDirectory
from diffoscope.comparators.utils.specialize import specialize
re_normalize_zeros = re.compile(
r"^(?P<prefix>[ \-\+])(?P<offset>[0-9a-f]+)(?=: )", re.MULTILINE
)
def init_file(filename):
# Ensure that any (specialized) FilesystemFile in tests have a
# corresponding Container for any comparator that needs to know which
# directory the file came from (eg. rdata)
container = FilesystemDirectory(os.path.dirname(filename)).as_container
return specialize(FilesystemFile(filename, container))
def init_fixture(filename):
return pytest.fixture(lambda: init_file(filename))
def data(filename):
return os.path.join(
os.path.dirname(os.path.dirname(__file__)), "data", filename
)
def get_data(filename):
with open(data(filename), encoding="utf-8") as f:
return f.read()
def assert_diff(difference, filename):
# Assign seen and expected values to local variables to improve contextual
# information in failed tests.
seen = difference.unified_diff
expected = get_data(filename)
assert seen == expected
def assert_diff_startswith(difference, filename):
haystack = difference.unified_diff
needle = get_data(filename)
assert haystack.startswith(needle)
# https://code.activestate.com/recipes/576620-changedirectory-context-manager/#c3
@contextlib.contextmanager
def cwd_data():
"""A context manager which changes the working directory to the given
path, and then changes it back to its previous value on exit.
"""
prev_cwd = os.getcwd()
os.chdir(data(""))
try:
yield
finally:
os.chdir(prev_cwd)
def load_fixture(filename):
return init_fixture(data(filename))
def normalize_zeros(s):
# older xxd had one zero less. Make sure there are always 8.
def repl(x):
return "{}{:08x}".format(x.group("prefix"), int(x.group("offset"), 16))
return re_normalize_zeros.sub(repl, s)
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