This file is indexed.

/usr/lib/python3/dist-packages/germinate/archive.py is in python3-germinate 2.8.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
# -*- coding: UTF-8 -*-
"""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, str):
            dists = [dists]
        if isinstance(components, str):
            components = [components]
        if isinstance(mirrors, str):
            mirrors = [mirrors]
        if isinstance(source_mirrors, str):
            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)