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#!/usr/bin/python
import os
from struct import *
import rpm
import copy
# Types
RPM_NULL = 0
RPM_CHAR = 1
RPM_INT8 = 2
RPM_INT16 = 3
RPM_INT32 = 4
RPM_INT64 = 5 # Unused currently
RPM_STRING = 6
RPM_BIN = 7
RPM_STRING_ARRAY = 8
RPM_I18NSTRING = 9
stringTypes = [ RPM_STRING, RPM_STRING_ARRAY, RPM_I18NSTRING ]
formatTable = {
RPM_CHAR : "!c",
RPM_INT8 : "!B",
RPM_INT16 : "!H",
RPM_INT32 : "!I",
RPM_INT64 : "!Q",
RPM_STRING : "s",
RPM_BIN : "s",
RPM_STRING_ARRAY : "s",
RPM_I18NSTRING : "s"
}
senseTable = {
"EQ": rpm.RPMSENSE_EQUAL,
"LT": rpm.RPMSENSE_LESS,
"GT": rpm.RPMSENSE_GREATER,
"LE": rpm.RPMSENSE_EQUAL | rpm.RPMSENSE_LESS,
"GE": rpm.RPMSENSE_EQUAL | rpm.RPMSENSE_GREATER
}
class YumHeader:
def __init__(self,po):
"""Partial and dumbed down header generation for cd installation
@param po
@type po: PackageObject"""
self.po = po
self.store = ""
self.offset = 0
self.indexes = []
self.tagtbl = {
'os': (rpm.RPMTAG_OS, RPM_STRING),
'name': (rpm.RPMTAG_NAME, RPM_STRING),
'epoch': (rpm.RPMTAG_EPOCH, RPM_INT32),
'version': (rpm.RPMTAG_VERSION, RPM_STRING),
'release': (rpm.RPMTAG_RELEASE, RPM_STRING),
'arch': (rpm.RPMTAG_ARCH, RPM_STRING),
'providename': (rpm.RPMTAG_PROVIDENAME, RPM_STRING_ARRAY),
'provideversion': (rpm.RPMTAG_PROVIDEVERSION, RPM_STRING_ARRAY),
'provideflags': (rpm.RPMTAG_PROVIDEFLAGS, RPM_STRING_ARRAY)
}
if 'epoch' in self.po.simpleItems():
self.po.simple['epoch'] = int(self.po.simple['epoch'])
def __format(self, tag, tagtype, value):
if not isinstance(value, (tuple, list)):
return self.__formatSingle(tag, tagtype, value)
else:
count = len(value)
data = ""
for entry in value:
(entrycount, entrydata) = self.__formatSingle(tag, tagtype, value)
data += entrydata
return (count, data)
def __formatSingle(self, tag, tagtype, value):
format = formatTable[tagtype]
count = 1
if tagtype == RPM_BIN:
format = "%%d%s" % format
count = len(value)
data = pack(format % (count, value))
elif tagtype in stringTypes:
# Null terminate
data = pack("%ds" % (len(value) + 1), value)
else:
data = pack(format, value)
return (count, data)
def __alignTag(self, tagtype):
"""Return alignment data for aligning for ttype from offset
self.offset."""
if tagtype == RPM_INT16:
align = (2 - (self.offset % 2)) % 2
elif tagtype == RPM_INT32:
align = (4 - (self.offset % 4)) % 4
elif tagtype == RPM_INT64:
align = (8 - (self.offset % 8)) % 8
else:
align = 0
return '\x00' * align
def convertTag(self, tag):
if self.tagtbl.has_key(tag):
(rpmtag, tagtype) = self.tagtbl[tag]
self.addTag(rpmtag, tagtype, self.po.returnSimple(tag))
def addTag(self, rpmtag, tagtype, value):
(count, data) = self.__format(rpmtag, tagtype, value)
pad = self.__alignTag(tagtype)
self.offset += len(pad)
self.indexes.append((rpmtag, tagtype,self.offset, count))
self.store += pad + data
self.offset += len(data)
def mungEpoch(self):
epoch = self.po.returnSimple('epoch')
(rpmtag, tagtype) = self.tagtbl['epoch']
if epoch is not None:
self.addTag(rpmtag, tagtype, int(epoch))
def generateProvides(self):
self.po.simple['provideversion'] = [ "%s-%s" % (self.po.returnSimple('version'), self.po.returnSimple('release')) ]
self.po.simple['providename'] = [self.po.returnSimple['name']]
self.po.simple['provideversion'] = [ "%s-%s" % (self.po.returnSimple('version'), self.po.returnSimple('release')) ]
self.po.returnSimple['provideflags'] = [senseTable["EQ"]]
self.convertTag('providename')
self.convertTag('provideversion')
self.convertTag('provideflags')
self.convertTag('provideflags')
def str(self):
self.po.simple['os'] = 'linux'
self.convertTag('os')
for tag in ['name','version', 'release', 'arch']:
if tag in self.po.simpleItems():
self.convertTag(tag)
self.mungEpoch()
magic = '\x8e\xad\xe8'
hdr_start_fmt= '!3sB4xii'
index_fmt = '!4I'
version = 1
hdr = pack(hdr_start_fmt, magic, version, len(self.indexes), len(self.store))
for (tag, tagtype, offset, count) in self.indexes:
hdr += pack(index_fmt, tag, tagtype, offset, count)
hdr += self.store
return hdr
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