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#!/usr/bin/python -tt
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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 Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Copyright 2006 Duke University

from yum.misc import cElementTree_iterparse as iterparse 
from yum.misc import _available_compression, stat_f
from Errors import RepoMDError

import sys
import types
from misc import AutoFileChecksums, to_xml

def ns_cleanup(qn):
    if qn.find('}') == -1: return qn 
    return qn.split('}')[1]

class RepoData:
    """represents anything beneath a <data> tag"""
    def __init__(self, elem=None):
        self.type = None
        if elem:
            self.type = elem.attrib.get('type')
        self.location = (None, None)
        self.checksum = (None,None) # type,value
        self.openchecksum = (None,None) # type,value
        self.timestamp = None
        self.dbversion = None
        self.size      = None
        self.opensize  = None
        self.deltas    = []

        if elem:
            self.parse(elem)

    def parse(self, elem):
        
        for child in elem:
            child_name = ns_cleanup(child.tag)
            if child_name == 'location':
                relative = child.attrib.get('href')
                base = child.attrib.get('base')
                self.location = (base, relative)
            
            elif child_name == 'checksum':
                csum_value = child.text
                csum_type = child.attrib.get('type')
                self.checksum = (csum_type,csum_value)

            elif child_name == 'open-checksum':
                csum_value = child.text
                csum_type = child.attrib.get('type')
                self.openchecksum = (csum_type, csum_value)
            
            elif child_name == 'timestamp':
                self.timestamp = child.text
            elif child_name == 'database_version':
                self.dbversion = child.text
            elif child_name == 'size':
                self.size = child.text
            elif child_name == 'open-size':
                self.opensize = child.text
            elif child_name == 'delta':
                delta = RepoData(child)
                delta.type = self.type
                self.deltas.append(delta)

    def dump_xml(self):
        msg = ""
        top = """<data type="%s">\n""" % to_xml(self.type, attrib=True)
        msg += top
        
        for (data, xmlname) in [('checksum', 'checksum'),('openchecksum', 'open-checksum')]:
            if hasattr(self, data):
                val = getattr(self, data)
                if val[0]:
                    d_xml = """  <%s type="%s">%s</%s>\n""" % (xmlname,
                                       to_xml(val[0], attrib=True), 
                                       to_xml(val[1]), xmlname)
                    msg += d_xml

        if hasattr(self, 'location'):
            val = getattr(self, 'location')
            if val[1]:
                loc = """  <location href="%s"/>\n""" % to_xml(val[1], attrib=True)
                if val[0]:
                    loc = """  <location xml:base="%s" href="%s"/>\n""" % (
                       to_xml(val[0], attrib=True), to_xml(val[1], attrib=True))
                msg += loc
            
        for (data,xmlname) in [('timestamp', 'timestamp'),
                               ('dbversion', 'database_version'),
                               ('size','size'), ('opensize', 'open-size')]:
            val = getattr(self, data)
            if val:
                d_xml = """  <%s>%s</%s>\n""" % (xmlname, to_xml(val), 
                                                 xmlname)
                msg += d_xml

        for delta in self.deltas:
            # change tag to "delta" and increase indent
            body = '\n  '.join(delta.dump_xml().split('\n')[1:-2])
            msg += '  <delta>\n  %s\n  </delta>\n' % body

        bottom = """</data>\n"""
        msg += bottom
        return msg
        
    def getDelta(self, old_timestamp):
        old_timestamp = int(old_timestamp)
        for deltamd in self.deltas:
            if int(deltamd.timestamp) <= old_timestamp:
                return deltamd

class RepoMD:
    """represents the repomd xml file"""
    
    def __init__(self, repoid, srcfile=None):
        """takes a repoid and a filename for the repomd.xml"""
        
        self.timestamp = 0
        self.repoid    = repoid
        self.repoData  = {}
        self.checksums = {}
        self.length    = 0
        self.revision  = None
        self.tags      = {'content' : set(), 'distro' : {}, 'repo': set()}
    
        if srcfile:
            self.parse(srcfile)
    
    def parse(self, srcfile):
        if type(srcfile) in types.StringTypes:
            # srcfile is a filename string
            try:
                infile = open(srcfile, 'rt')
            except IOError:
                raise RepoMDError, "Unable to open %s" %(srcfile,)
        else:
            # srcfile is a file object
            infile = srcfile
            srcfile = None

        # We trust any of these to mean the repomd.xml is valid.
        infile = AutoFileChecksums(infile, ['sha256', 'sha512'],
                                   ignore_missing=True, ignore_none=True)
        parser = iterparse(infile)
        
        try:
            for event, elem in parser:
                elem_name = ns_cleanup(elem.tag)
                
                if elem_name == "data":
                    thisdata = RepoData(elem=elem)
                    old = self.repoData.get(thisdata.type)
                    if (old and old.size and old.size < thisdata.size
                        and old.location[1].rsplit('.', 1)[1] in _available_compression
                        and srcfile and stat_f(srcfile.rsplit('/', 1)[0] +'/'+
                                               thisdata.location[1].rsplit('/', 1)[1]) is None):
                        # previous is smaller, can unzip it, and next is not cached
                        thisdata = old
                    self.repoData[thisdata.type] = thisdata
                    try:
                        # NOTE: This will fail on float timestamps, this is
                        # required for compatability. Fix is to not generate
                        # float timestamps in repomd.xml.
                        nts = int(thisdata.timestamp)
                        if nts > self.timestamp: # max() not in old python
                            self.timestamp = nts
                    except:
                        pass
                elif elem_name == "revision":
                    self.revision = elem.text
                elif elem_name == "tags":
                    for child in elem:
                        child_name = ns_cleanup(child.tag)
                        if child_name == 'content':
                            self.tags['content'].add(child.text)
                        if child_name == 'distro':
                            cpeid = child.attrib.get('cpeid', '')
                            distro = self.tags['distro'].setdefault(cpeid,set())
                            distro.add(child.text)

            self.checksums = infile.checksums.hexdigests()
            self.length    = len(infile.checksums)
        except SyntaxError, e:
            raise RepoMDError, "Damaged repomd.xml file"
            
    def fileTypes(self):
        """return list of metadata file types available"""
        return self.repoData.keys()
    
    def getData(self, type):
        if type in self.repoData:
            return self.repoData[type]
        else:
            raise RepoMDError, "requested datatype %s not available" % type
            
    def dump(self):
        """dump fun output"""

        print "file timestamp: %s" % self.timestamp
        print "file length   : %s" % self.length
        for csum in sorted(self.checksums):
            print "file checksum : %s/%s" % (csum, self.checksums[csum])
        if self.revision is not None:
            print 'revision: %s' % self.revision
        if self.tags['content']:
            print 'tags content: %s' % ", ".join(sorted(self.tags['content']))
        if self.tags['distro']:
            for distro in sorted(self.tags['distro']):
                print 'tags distro: %s' % distro
                tags = self.tags['distro'][distro]
                print '  tags: %s' % ", ".join(sorted(tags))
        print '\n---- Data ----'
        for ft in sorted(self.fileTypes()):
            thisdata = self.repoData[ft]
            print '  datatype: %s' % thisdata.type
            print '    location     : %s %s' % thisdata.location
            print '    timestamp    : %s' % thisdata.timestamp
            print '    size         : %s' % thisdata.size
            print '    open size    : %s' % thisdata.opensize
            print '    checksum     : %s - %s' % thisdata.checksum
            print '    open checksum: %s - %s' %  thisdata.openchecksum
            print '    dbversion    : %s' % thisdata.dbversion
            print ''
    def dump_xml(self):
        msg = ""
        
        top = """<?xml version="1.0" encoding="UTF-8"?>
<repomd xmlns="http://linux.duke.edu/metadata/repo" xmlns:rpm="http://linux.duke.edu/metadata/rpm">\n"""
        msg += top
        if self.revision:
            rev = """ <revision>%s</revision>\n""" % to_xml(self.revision)
            msg += rev
        
        if self.tags['content'] or self.tags['distro'] or self.tags['repo']:
            tags = """ <tags>\n"""
            for item in self.tags['content']:
                tag = """   <content>%s</content>\n""" % (to_xml(item))
                tags += tag
            for item in self.tags['repo']:
                tag = """   <repo>%s</repo>\n""" % (to_xml(item))
                tags += tag
            distro = self.tags['distro']
            if isinstance(distro, dict):
                lst = []
                for cpeid in sorted(distro):
                    for item in sorted(distro[cpeid]):
                        lst.append((cpeid, item))
                distro = lst
            for (cpeid, item) in distro:
                if cpeid:
                    tag = """   <distro cpeid="%s">%s</distro>\n""" % (
                                to_xml(cpeid, attrib=True), to_xml(item))
                else:
                    tag = """   <distro>%s</distro>\n""" % (to_xml(item))
                tags += tag
            tags += """ </tags>\n"""
            msg += tags
        
        for md in self.repoData.values():
            msg += md.dump_xml()
        
        msg += """</repomd>\n"""

        return msg

def main():

    try:
        print "file          : %s" % sys.argv[1]
        p = RepoMD('repoid', sys.argv[1])
        p.dump()
        
    except IOError:
        print >> sys.stderr, "newcomps.py: No such file:\'%s\'" % sys.argv[1]
        sys.exit(1)
        
if __name__ == '__main__':
    main()

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