Viewing file:  transaction.py (4.03 KB) -rw-r--r--
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#!/usr/bin/python
#
# Client code for Update Agent
# Copyright (c) 1999-2002 Red Hat, Inc. Distributed under GPL.
#
# Adrian Likins <alikins@redhat.com>
# Some Edits by Seth Vidal <skvidal@phy.duke.edu>
#
# a couple of classes wrapping up transactions so that we
# can share transactions instead of creating new ones all over
#
import rpm
import miscutils
read_ts = None
ts = None
# wrapper/proxy class for rpm.Transaction so we can
# instrument it, etc easily
class TransactionWrapper:
def __init__(self, root='/'):
self.ts = rpm.TransactionSet(root)
self._methods = ['dbMatch',
'check',
'order',
'addErase',
'addInstall',
'run',
'IDTXload',
'IDTXglob',
'rollback',
'pgpImportPubkey',
'pgpPrtPkts',
'Debug',
'setFlags',
'setVSFlags',
'setProbFilter',
'hdrFromFdno',
'next',
'clean']
self.tsflags = []
def __getattr__(self, attr):
if attr in self._methods:
return self.getMethod(attr)
else:
raise AttributeError, attr
def __iter__(self):
return self.ts
def getMethod(self, method):
# in theory, we can override this with
# profile/etc info
return getattr(self.ts, method)
# push/pop methods so we dont lose the previous
# set value, and we can potentiall debug a bit
# easier
def pushVSFlags(self, flags):
self.tsflags.append(flags)
self.ts.setVSFlags(self.tsflags[-1])
def popVSFlags(self):
del self.tsflags[-1]
self.ts.setVSFlags(self.tsflags[-1])
def addTsFlag(self, flag):
curflags = self.ts.setFlags(0)
self.ts.setFlags(curflags | flag)
def test(self, cb, conf={}):
"""tests the ts we've setup, takes a callback function and a conf dict
for flags and what not"""
#FIXME
# I don't like this function - it should test, sure - but not
# with this conf dict, we should be doing that beforehand and
# we should be packing this information away elsewhere.
self.addTsFlag(rpm.RPMTRANS_FLAG_TEST)
if conf.has_key('diskspacecheck'):
if conf['diskspacecheck'] == 0:
self.ts.setProbFilter(rpm.RPMPROB_FILTER_DISKSPACE)
tserrors = self.ts.run(cb.callback, '')
reserrors = []
if tserrors:
for (descr, (etype, mount, need)) in tserrors:
reserrors.append(descr)
return reserrors
def returnLeafNodes(self):
"""returns a list of package tuples (n,a,e,v,r) that are not required by
any other package on the system"""
req = {}
orphan = []
mi = self.dbMatch()
if mi is None: # this is REALLY unlikely but let's just say it for the moment
return orphan
for h in mi:
tup = miscutils.pkgTupleFromHeader(h)
if not h[rpm.RPMTAG_REQUIRENAME]:
continue
for r in h[rpm.RPMTAG_REQUIRENAME]:
req[r] = tup
mi = self.dbMatch()
if mi is None:
return orphan
for h in mi:
preq = 0
tup = miscutils.pkgTupleFromHeader(h)
for p in h[rpm.RPMTAG_PROVIDES] + h[rpm.RPMTAG_FILENAMES]:
if req.has_key(p):
preq = preq + 1
if preq == 0:
orphan.append(tup)
return orphan
def initReadOnlyTransaction(root='/'):
read_ts = TransactionWrapper(root=root)
read_ts.pushVSFlags((rpm._RPMVSF_NOSIGNATURES|rpm._RPMVSF_NODIGESTS))
return read_ts
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