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# author: Jonathan Dieter <jdieter@gmail.com>
#
# mostly taken from mdparser.py (part of yum) with a few minor modifications
#
# 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 2005 Duke University
# Portions copyright 2007 Jonathan Dieter
import gzip
try:
from cElementTree import iterparse
except:
from xml.etree.cElementTree import iterparse
from cStringIO import StringIO
#TODO: document everything here
class PrestoMDParser:
def __init__(self, filename):
# Set up mapping of meta types to handler classes
handlers = {
'{http://linux.duke.edu/metadata/common}metadata': DeltasEntry,
}
self.total = None
self.count = 0
self._handlercls = None
# Read in type, set package node handler and get total number of
# packages
if filename[-3:] == '.gz': fh = gzip.open(filename, 'r')
else: fh = open(filename, 'r')
parser = iterparse(fh, events=('start', 'end'))
self.reader = parser.__iter__()
event, elem = self.reader.next()
self._handlercls = handlers.get(elem.tag, None)
if not self._handlercls:
raise ValueError('Unknown repodata type "%s" in %s' % (
elem.tag, filename))
def getDeltaList(self):
for event, elem in self.reader:
if event == 'end' and elem.tag == '{http://linux.duke.edu/metadata/common}metadata':
return self._handlercls(elem)
class BaseEntry:
def __init__(self, elem):
self._p = {}
def __getitem__(self, k):
return self._p[k]
def keys(self):
return self._p.keys()
def values(self):
return self._p.values()
def has_key(self, k):
return self._p.has_key(k)
def __str__(self):
out = StringIO()
keys = self.keys()
keys.sort()
for k in keys:
line = u'%s=%s\n' % (k, self[k])
out.write(line.encode('utf8'))
return out.getvalue()
def _bn(self, qn):
if qn.find('}') == -1: return qn
return qn.split('}')[1]
def _prefixprops(self, elem, prefix):
ret = {}
for key in elem.attrib.keys():
ret[prefix + '_' + self._bn(key)] = elem.attrib[key]
return ret
class DeltasEntry(BaseEntry):
def __init__(self, deltas):
BaseEntry.__init__(self, deltas)
# Avoid excess typing :)
p = self._p
for elem in deltas:
temp = {}
key1 = ""
key2 = ""
for child in elem:
name = self._bn(child.tag)
if name in ('name', 'arch'):
temp[name] = child.text
elif name == 'version':
attrib = child.attrib
try:
attrib['epoch'] = int(attrib['epoch'])
except:
attrib['epoch'] = 0
key1 = "%s*%s*%i*%s*%s" % (temp['name'], temp['arch'], attrib['epoch'], attrib['ver'], attrib['rel'])
elif name == 'deltas':
for oldrpm in child:
temp2 = {}
value = {}
key = None
for oldrpm_child in oldrpm:
name = self._bn(oldrpm_child.tag)
if name in ('name', 'arch'):
temp2[name] = oldrpm_child.text
elif name == 'version':
ch_attrib = oldrpm_child.attrib
try:
ch_attrib['epoch'] = int(ch_attrib['epoch'])
except:
ch_attrib['epoch'] = attrib['epoch']
try:
ch_attrib['ver'] = ch_attrib['ver']
except:
ch_attrib['ver'] = attrib['ver']
if not temp2.has_key('name'):
temp2['name'] = temp['name']
if not temp2.has_key('arch'):
temp2['arch'] = temp['arch']
key2 = "%s*%s*%i*%s*%s" % (temp2['name'], temp2['arch'], ch_attrib['epoch'], ch_attrib['ver'], ch_attrib['rel'])
key = "%s!!%s" % (key1, key2)
p[key] = {}
if name in ('sequence', 'drpm_filename', 'size'):
p[key][name] = oldrpm_child.text
if name == "checksum":
p[key][name] = oldrpm_child.text
p[key]["%s_type" % name] = oldrpm_child.attrib['type']
deltas.clear()
def test():
import sys
parser = PrestoMDParser(sys.argv[1])
deltalist = parser.getDeltaList()
print '-' * 40
print deltalist
print 'read: %s deltarpms ' % (len(deltalist.keys()))
if __name__ == '__main__':
test()
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