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  • Committer: Bazaar Package Importer
  • Author(s): Michael Vogt
  • Date: 2007-02-07 18:02:35 UTC
  • Revision ID: james.westby@ubuntu.com-20070207180235-i0mgzoi54v54ezq7
Tags: 0.56
* added --proposed switch to fetch a release-upgrader from a different
  location (similar to the -proposed pocket in the archive)
* split into update-manager and update-manager-core and support
  cli release upgrades with the later
* added fdsend module to support file descriptor passing over sockets
  this will allow a better seperation between frontend and backend
  in the future

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UpdateManager/Core/MetaRelease.py
 
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# MetaRelease.py 
 
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#  
 
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#  Copyright (c) 2004,2005 Canonical
 
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#  
 
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#  Author: Michael Vogt <michael.vogt@ubuntu.com>
 
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# 
 
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#  This program is free software; you can redistribute it and/or 
 
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#  modify it under the terms of the GNU General Public License as 
 
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#  published by the Free Software Foundation; either version 2 of the
 
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#  License, or (at your option) any later version.
 
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# 
 
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#  This program is distributed in the hope that it will be useful,
 
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#  but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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#  GNU General Public License for more details.
 
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# 
 
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#  You should have received a copy of the GNU General Public License
 
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#  along with this program; if not, write to the Free Software
 
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#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 
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#  USA
 
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import thread
 
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import urllib2
 
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import os
 
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import string
 
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import apt_pkg
 
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import time
 
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import rfc822
 
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from subprocess import Popen,PIPE
 
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class Dist(object):
 
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    def __init__(self, name, version, date, supported):
 
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        self.name = name
 
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        self.version = version
 
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        self.date = date
 
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        self.supported = supported
 
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        self.releaseNotesURI = None
 
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        self.upgradeTool = None
 
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        self.upgradeToolSig = None
 
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class MetaReleaseCore(object):
 
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    # some constants
 
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    METARELEASE_URI = "http://changelogs.ubuntu.com/meta-release"
 
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    METARELEASE_URI_UNSTABLE = "http://changelogs.ubuntu.com/meta-release-development"
 
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    METARELEASE_URI_PROPOSED = "http://changelogs.ubuntu.com/meta-release-proposed"
 
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    METARELEASE_FILE = "/var/lib/update-manager/meta-release"
 
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    def __init__(self, useDevelopmentRelease=False, useProposed=False):
 
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        # check what uri to use
 
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        if useDevelopmentRelease:
 
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            self.METARELEASE_URI = self.METARELEASE_URI_UNSTABLE
 
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        elif useProposed:
 
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            self.METARELEASE_URI = self.METARELEASE_URI_PROPOSED
 
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        # check if we can access the METARELEASE_FILE
 
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        if not os.access(self.METARELEASE_FILE, os.F_OK|os.W_OK|os.R_OK):
 
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            path = os.path.expanduser("~/.update-manager/")
 
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            if not os.path.exists(path):
 
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                os.mkdir(path)
 
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            self.METARELEASE_FILE = os.path.join(path,"meta-release")
 
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        self.metarelease_information = None
 
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        self.downloading = True
 
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        # information about the available dists
 
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        self.new_dist = None
 
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        self.no_longer_supported = None
 
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        # we start the download thread here and we have a timeout
 
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        t=thread.start_new_thread(self.download, ())
 
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        #t=thread.start_new_thread(self.check, ())
 
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    def dist_no_longer_supported(self, dist):
 
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        """ virtual function that is called when the distro is no longer
 
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            supported
 
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        """
 
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        self.no_longer_supported = dist
 
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    def new_dist_available(self, dist):
 
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        """ virtual function that is called when a new distro release
 
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            is available
 
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        """
 
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        self.new_dist = dist
 
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    def get_dist(self):
 
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        " return the codename of the current runing distro "
 
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        p = Popen(["lsb_release","-c","-s"],stdout=PIPE)
 
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        res = p.wait()
 
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        if res != 0:
 
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            sys.stderr.write("lsb_release returned exitcode: %i\n" % res)
 
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        dist = string.strip(p.stdout.readline())
 
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        return dist
 
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    def parse(self):
 
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        #print "parse"
 
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        current_dist_name = self.get_dist()
 
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        current_dist = None
 
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        dists = []
 
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        # parse the metarelease_information file
 
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        index_tag = apt_pkg.ParseTagFile(self.metarelease_information)
 
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        step_result = index_tag.Step()
 
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        while step_result:
 
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            if index_tag.Section.has_key("Dist"):
 
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                name = index_tag.Section["Dist"]
 
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                #print name
 
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                rawdate = index_tag.Section["Date"]
 
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                date = time.mktime(rfc822.parsedate(rawdate))
 
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                supported = bool(index_tag.Section["Supported"])
 
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                version = index_tag.Section["Version"]
 
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                # add the information to a new date object
 
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                dist = Dist(name, version, date,supported)
 
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                if index_tag.Section.has_key("ReleaseNotes"):
 
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                    dist.releaseNotesURI = index_tag.Section["ReleaseNotes"]
 
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                if index_tag.Section.has_key("UpgradeTool"):
 
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                    dist.upgradeTool =  index_tag.Section["UpgradeTool"]
 
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                if index_tag.Section.has_key("UpgradeToolSignature"):
 
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                    dist.upgradeToolSig =  index_tag.Section["UpgradeToolSignature"]
 
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                dists.append(dist)
 
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                if name == current_dist_name:
 
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                    current_dist = dist 
 
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            step_result = index_tag.Step()
 
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        # first check if the current runing distro is in the meta-release
 
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        # information. if not, we assume that we run on something not
 
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        # supported and silently return
 
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        if current_dist == None:
 
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            print "current dist not found in meta-release file"
 
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            return False
 
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        # then see what we can upgrade to (only upgrade to supported dists)
 
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        upgradable_to = ""
 
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        for dist in dists:
 
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            if dist.date > current_dist.date and dist.supported == True: 
 
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                upgradable_to = dist
 
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                #print "new dist: %s" % upgradable_to
 
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                break
 
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        # only warn if unsupported and a new dist is available (because 
 
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        # the development version is also unsupported)
 
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        if upgradable_to != "" and not current_dist.supported:
 
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            self.dist_no_longer_supported(upgradabl_to)
 
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        elif upgradable_to != "":
 
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            self.new_dist_available(upgradable_to)
 
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        # parsing done and sucessfully
 
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        return True
 
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    # the network thread that tries to fetch the meta-index file
 
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    # can't touch the gui, runs as a thread
 
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    def download(self):
 
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        #print "download"
 
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        lastmodified = 0
 
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        req = urllib2.Request(self.METARELEASE_URI)
 
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        if os.access(self.METARELEASE_FILE, os.W_OK):
 
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            lastmodified = os.stat(self.METARELEASE_FILE).st_mtime
 
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        if lastmodified > 0:
 
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            req.add_header("If-Modified-Since", lastmodified)
 
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        try:
 
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            uri=urllib2.urlopen(req)
 
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            if (os.path.exists(self.METARELEASE_FILE) and
 
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                not os.access(self.METARELEASE_FILE,os.W_OK)):
 
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                os.unlink(self.METARELEASE_FILE)
 
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            f=open(self.METARELEASE_FILE,"w+")
 
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            for line in uri.readlines():
 
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                f.write(line)
 
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            f.flush()
 
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            f.seek(0,0)
 
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            self.metarelease_information=f
 
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            uri.close()
 
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        except urllib2.URLError:
 
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            if os.path.exists(self.METARELEASE_FILE):
 
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                f=open(self.METARELEASE_FILE,"r")
 
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        # now check the information we have
 
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        self.downloading = False
 
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        if self.metarelease_information != None:
 
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            self.parse()