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| Current File : //lib/python2.7/site-packages/yum/mdparser.py |
#! /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 2005 Duke University
import gzip
try:
from xml.etree import cElementTree
except ImportError:
import cElementTree
iterparse = cElementTree.iterparse
from cStringIO import StringIO
import warnings
import Errors
#TODO: document everything here
class MDParser:
def __init__(self, filename):
# Set up mapping of meta types to handler classes
handlers = {
'{http://linux.duke.edu/metadata/common}metadata': PrimaryEntry,
'{http://linux.duke.edu/metadata/filelists}filelists': FilelistsEntry,
'{http://linux.duke.edu/metadata/other}otherdata': OtherEntry,
}
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))
# Get the total number of packages
self.total = int(elem.get('packages', 0))
def __iter__(self):
return self
def next(self):
for event, elem in self.reader:
if event == 'end' and elem.tag[-7:] == 'package':
self.count += 1
return self._handlercls(elem)
raise StopIteration
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):
warnings.warn('has_key() will go away in a future version of Yum.\n',
Errors.YumFutureDeprecationWarning, stacklevel=2)
return k in self._p
def __iter__(self):
return iter(self._p)
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:
ret[prefix + '_' + self._bn(key)] = elem.attrib[key]
return ret
class PrimaryEntry(BaseEntry):
def __init__(self, elem):
BaseEntry.__init__(self, elem)
# Avoid excess typing :)
p = self._p
self.prco = {}
self.files = {}
for child in elem:
name = self._bn(child.tag)
if name in ('name', 'arch', 'summary', 'description', 'url',
'packager'):
p[name] = child.text
elif name == 'version':
p.update(child.attrib)
elif name in ('time', 'size'):
p.update(self._prefixprops(child, name))
elif name in ('checksum', 'location'):
p.update(self._prefixprops(child, name))
p[name + '_value'] = child.text
if name == 'location' and "location_base" not in p:
p["location_base"] = None
elif name == 'format':
self.setFormat(child)
p['pkgId'] = p['checksum_value']
elem.clear()
def setFormat(self, elem):
# Avoid excessive typing :)
p = self._p
for child in elem:
name = self._bn(child.tag)
if name in ('license', 'vendor', 'group', 'buildhost',
'sourcerpm'):
p[name] = child.text
elif name in ('provides', 'requires', 'conflicts',
'obsoletes'):
self.prco[name] = self.getPrco(child)
elif name == 'header-range':
p.update(self._prefixprops(child, 'rpm_header'))
elif name == 'file':
file_type = child.get('type', 'file')
path = child.text
self.files[path] = file_type
def getPrco(self, elem):
members = []
for child in elem:
members.append(child.attrib)
return members
class FilelistsEntry(BaseEntry):
def __init__(self, elem):
BaseEntry.__init__(self, elem)
self._p['pkgId'] = elem.attrib['pkgid']
self.files = {}
for child in elem:
name = self._bn(child.tag)
if name == 'file':
file_type = child.get('type', 'file')
path = child.text
self.files[path] = file_type
elem.clear()
class OtherEntry(BaseEntry):
def __init__(self, elem):
BaseEntry.__init__(self, elem)
self._p['pkgId'] = elem.attrib['pkgid']
self._p['changelog'] = []
for child in elem:
name = self._bn(child.tag)
if name == 'changelog':
entry = child.attrib
entry['value'] = child.text
self._p['changelog'].append(entry)
elem.clear()
def test():
import sys
parser = MDParser(sys.argv[1])
for pkg in parser:
print '-' * 40
print pkg
print 'read: %s packages (%s suggested)' % (parser.count, parser.total)
if __name__ == '__main__':
test()