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/usr/share/pyshared/germinate/archive.py is in python-germinate 2.8.

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# -*- 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, 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)