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#!/usr/bin/python3
# Copyright (C) 2019 Canonical Ltd.
# Author: Brian Murray <brian.murray@canonical.com>
# This program 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; version 3 of the License.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
"""Portions of archive related code that is re-used by various tools."""
import gzip
import os
import tempfile
import apt_pkg
def read_tag_file(path, pkg=None):
tmp = tempfile.NamedTemporaryFile(prefix='checkrdepends.', delete=False)
try:
compressed = gzip.open(path)
try:
tmp.write(compressed.read())
finally:
compressed.close()
tmp.close()
with open(tmp.name) as uncompressed:
tag_file = apt_pkg.TagFile(uncompressed)
prev_name = None
prev_stanza = None
for stanza in tag_file:
try:
name = stanza['package']
except KeyError:
continue
if pkg:
if name != pkg:
continue
if name != prev_name and prev_stanza is not None:
yield prev_stanza
prev_name = name
prev_stanza = stanza
if prev_stanza is not None:
yield prev_stanza
finally:
os.unlink(tmp.name)
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