/usr/share/pyshared/germinate/archive.py is in python-germinate 2.8.
This file is owned by root:root, with mode 0o644.
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"""Representations of archives for use by Germinate."""
# Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
# Canonical Ltd.
#
# Germinate 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 2, or (at your option) any
# later version.
#
# Germinate 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 Germinate; see the file COPYING. If not, write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301, USA.
from __future__ import print_function
import os
try:
from urllib.parse import quote
from urllib.request import Request, urlopen
except ImportError:
from urllib import quote
from urllib2 import Request, urlopen
import tempfile
import shutil
import logging
import apt_pkg
_logger = logging.getLogger(__name__)
def _progress(msg, *args, **kwargs):
_logger.info(msg, *args, extra={'progress': True}, **kwargs)
class IndexType:
"""Types of archive index files."""
PACKAGES = 1
SOURCES = 2
INSTALLER_PACKAGES = 3
class Archive:
"""An abstract representation of an archive for use by Germinate."""
def sections(self):
"""Yield a sequence of the index sections found in this archive.
A section is an entry in an index file corresponding to a single binary
or source package.
Each yielded value should be an (IndexType, section) pair, where
section is a dictionary mapping control file keys to their values.
"""
raise NotImplementedError
class TagFile(Archive):
"""Fetch package lists from a Debian-format archive as apt tag files."""
def __init__(self, dists, components, arch, mirrors, source_mirrors=None,
installer_packages=True, cleanup=False):
"""Create a representation of a Debian-format apt archive."""
if isinstance(dists, basestring):
dists = [dists]
if isinstance(components, basestring):
components = [components]
if isinstance(mirrors, basestring):
mirrors = [mirrors]
if isinstance(source_mirrors, basestring):
source_mirrors = [source_mirrors]
self._dists = dists
self._components = components
self._arch = arch
self._mirrors = mirrors
self._installer_packages = installer_packages
if source_mirrors:
self._source_mirrors = source_mirrors
else:
self._source_mirrors = mirrors
self._cleanup = cleanup
def _open_tag_files(self, mirrors, dirname, tagfile_type,
dist, component, ftppath):
def _open_tag_file(mirror, suffix):
"""Download an apt tag file if needed, then open it."""
if not mirror.endswith('/'):
mirror += '/'
url = (mirror + "dists/" + dist + "/" + component + "/" + ftppath +
suffix)
req = Request(url)
filename = None
if req.get_type() != "file":
filename = "%s_%s_%s_%s" % (quote(mirror, safe=""), dist,
component, tagfile_type)
else:
# Make a more or less dummy filename for local URLs.
filename = os.path.split(req.get_selector())[0].replace(os.sep, "_")
fullname = os.path.join(dirname, filename)
if req.get_type() == "file":
# Always refresh. TODO: we should use If-Modified-Since for
# remote HTTP tag files.
try:
os.unlink(fullname)
except OSError:
pass
if not os.path.exists(fullname):
_progress("Downloading %s file ...", req.get_full_url())
compressed = os.path.join(dirname, filename + suffix)
try:
url_f = urlopen(req)
try:
with open(compressed, "wb") as compressed_f:
compressed_f.write(url_f.read())
finally:
url_f.close()
# apt_pkg is weird and won't accept GzipFile
if suffix:
_progress("Decompressing %s file ...",
req.get_full_url())
if suffix == ".gz":
import gzip
compressed_f = gzip.GzipFile(compressed)
elif suffix == ".bz2":
import bz2
compressed_f = bz2.BZ2File(compressed)
else:
raise RuntimeError("Unknown suffix '%s'" % suffix)
# This can be simplified once we can require Python
# 2.7, where gzip.GzipFile and bz2.BZ2File are
# context managers.
try:
with open(fullname, "wb") as f:
f.write(compressed_f.read())
f.flush()
finally:
compressed_f.close()
finally:
if suffix:
try:
os.unlink(compressed)
except OSError:
pass
return open(fullname, "r")
tag_files = []
for mirror in mirrors:
tag_file = None
for suffix in (".bz2", ".gz", ""):
try:
tag_file = _open_tag_file(mirror, suffix)
tag_files.append(tag_file)
break
except (IOError, OSError):
pass
if len(tag_files) == 0:
raise IOError("no %s files found" % tagfile_type)
return tag_files
def sections(self):
"""Yield a sequence of the index sections found in this archive.
A section is an entry in an index file corresponding to a single binary
or source package.
Each yielded value is an (IndexType, section) pair, where section is
a dictionary mapping control file keys to their values.
"""
if self._cleanup:
dirname = tempfile.mkdtemp(prefix="germinate-")
else:
dirname = '.'
for dist in self._dists:
for component in self._components:
packages = self._open_tag_files(
self._mirrors, dirname, "Packages", dist, component,
"binary-" + self._arch + "/Packages")
for tag_file in packages:
try:
for section in apt_pkg.TagFile(tag_file):
yield (IndexType.PACKAGES, section)
finally:
tag_file.close()
sources = self._open_tag_files(
self._source_mirrors, dirname, "Sources", dist, component,
"source/Sources")
for tag_file in sources:
try:
for section in apt_pkg.TagFile(tag_file):
yield (IndexType.SOURCES, section)
finally:
tag_file.close()
instpackages = ""
if self._installer_packages:
try:
instpackages = self._open_tag_files(
self._mirrors, dirname, "InstallerPackages", dist, component,
"debian-installer/binary-" + self._arch + "/Packages")
except IOError:
# can live without these
_progress("Missing installer Packages file for %s "
"(ignoring)", component)
else:
for tag_file in instpackages:
try:
for section in apt_pkg.TagFile(tag_file):
yield (IndexType.INSTALLER_PACKAGES,
section)
finally:
tag_file.close()
if self._cleanup:
shutil.rmtree(dirname)
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