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# author: Jonathan Dieter <jdieter@gmail.com>
#
# heavily modified from yum-deltarpm.py created by
# Lars Herrmann <herrmann@redhat.com>
#
# 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
# Copyright 2007 Jonathan Dieter
# Copyright 2007 Red Hat, Inc. -- Jeremy Katz <katzj@redhat.com>
import os
import sys
import subprocess
import gzip
import thread
import threading
import Queue
try:
from cElementTree import iterparse
except:
from xml.etree.cElementTree import iterparse
from yum.plugins import TYPE_CORE, PluginYumExit
import yum.Errors
import yum.misc
from urlgrabber.grabber import URLGrabError
requires_api_version = '2.1'
plugin_type = (TYPE_CORE,)
# mapping of repo.id -> PrestoInfo
pinfo = {}
def verifyDelta(sequence, arch):
if subprocess.call(["/usr/bin/applydeltarpm", "-a", arch,
"-C", "-s", sequence]):
return False
return True
def applyDelta(deltarpmfile, newrpmfile, arch):
if subprocess.call(["/usr/bin/applydeltarpm", "-a", arch,
deltarpmfile, newrpmfile]):
return False
return True
def reconstruct(conduit, rpmlocal, rpmarch, deltalocal):
retlist = ""
if not applyDelta(deltalocal, rpmlocal, rpmarch):
retlist += "Error rebuilding rpm from %s! Will download full package.\n" % os.path.basename(deltalocal)
try:
os.unlink(rpmlocal)
except:
pass
else:
# Check to see whether or not we should keep the drpms
# FIXME: Is there any way to see whether or not a Boolean option was not set?
if conduit.confBool('main', 'neverkeepdeltas'):
delete = True
elif conduit.confBool('main', 'keepdeltas'):
delete = False
elif conduit.getConf().keepcache != 0:
delete = False
else:
delete = True
if delete:
try:
os.unlink(deltalocal)
except:
pass
return retlist
class ReconstructionThread(threading.Thread):
def __init__(self, queue, lock, run_function):
threading.Thread.__init__(self)
self.run_function = run_function
self.queue = queue
self.lock = lock
self.can_exit = False
self.messages = ""
def run(self):
while True:
try:
retval = self.queue.get(not self.can_exit)
except Queue.Empty:
# If we're done with our drpms and no more are coming, let's
# blow this joint
break
if retval != None:
messages = apply(self.run_function, retval)
if self.can_exit:
# If there are not going to be any more new drpms,
# send messages directly to conduit
conduit = retval[0]
if self.messages != "":
conduit.info(2, self.messages[:-1])
self.messages = ""
if messages != "":
conduit.info(2, messages[:-1])
else:
# We may be downloading drpms still, so queue messages
self.lock.acquire()
self.messages += messages
self.lock.release()
def getDelta(po, presto, rpmdb):
"""Does the package have a reasonable delta for us to use?"""
# local packages don't make sense to use a delta for...
if hasattr(po, 'pkgtype') and po.pkgtype == 'local':
return None
if po.remote_url.startswith("file:/"):
# kind of a hack, but file:/ repos are basically local
return None
# if there's not presto info for the repo, we don't have a delta for
# the package
if not presto.has_key(po.repo.id):
return None
deltainfo = presto[po.repo.id]
# any deltas for the new package in the repo?
nevra = "%s-%s:%s-%s.%s" %(po.name, po.epoch, po.version,
po.release, po.arch)
if not deltainfo.has_key(nevra):
return None
deltas = deltainfo[nevra]
# check to see if we've already got the full package
local = po.localPkg()
if os.path.exists(local):
cursize = os.stat(local)[6]
totsize = long(po.size)
if po.verifyLocalPkg(): # we've got it.
return None
if cursize < totsize: # we have part of the file; do a reget
return None
os.unlink(local)
# did we have a previous package of the same arch installed?
installed = rpmdb.searchNevra(po.name, None, None, None, po.arch)
if len(installed) == 0:
return None
# now, let's see if there's a delta for us...
bestdelta = None
for oldpo in installed:
evr = "%s:%s-%s" %(oldpo.epoch, oldpo.version, oldpo.release)
if not deltas.has_key(evr):
continue
delta = deltas[evr]
# we just want to use the smallest delta
if bestdelta and delta['size'] >= bestdelta['size']:
continue
if not verifyDelta(delta['sequence'], po.arch):
continue
bestdelta = delta
return bestdelta
def downloadPkgs(conduit, presto):
"""download list of package objects handed to you, return errors"""
errors = {}
def adderror(po, msg):
errors.setdefault(po, []).append(msg)
# Set up thread for applying drpms
queue = Queue.Queue(0)
lock = thread.allocate_lock()
curthread = ReconstructionThread(queue, lock, reconstruct)
curthread.start()
remote_pkgs = []
# see which deltas we need to download; if the delta is already
# downloaded, we can start it reconstructing in the background
for po in conduit.getDownloadPackages():
delta = getDelta(po, presto, conduit.getRpmDB())
if delta is None:
continue
# verify the delta if it already exists
deltadir = os.path.join(po.repo.cachedir, 'deltas')
if not os.path.isdir(deltadir):
try:
os.mkdir(deltadir)
except OSError:
continue
deltapath = os.path.join(deltadir,
os.path.basename(delta['filename']))
if os.path.exists(deltapath):
try:
conduit._base.verifyChecksum(deltapath, delta['checksum_type'],
delta['checksum'])
except URLGrabError, e:
if po.repo.cache:
raise Errors.RepoError, "Caching enabled and local cache for %s doesn't match checksum" %(deltapath,)
else:
cursize = os.stat(deltapath)[6]
totsize = long(delta['size'])
if cursize >= totsize:
os.unlink(deltapath)
remote_packages.append( (po, delta) )
else:
# Deltarpm is local and good, put it in the rebuild thread.
conduit.info(5, "using local copy of deltarpm for %s" % po)
queue.put((conduit, po.localpath, po.arch, deltapath))
continue
else:
remote_pkgs.append( (po, delta) )
# now we need to do downloads
i = 0
for (po, delta) in remote_pkgs:
i += 1
# FIXME: verifyChecksum should handle the urlgrabber objects...
checkfunc = (lambda fo, csumtype, csum:
conduit._base.verifyChecksum(fo.filename, csumtype, csum),
(delta['checksum_type'],
delta['checksum']), {})
deltadir = os.path.join(po.repo.cachedir, 'deltas')
deltapath = os.path.join(deltadir,
os.path.basename(delta['filename']))
# FIXME: this should be moved into _getFile
dirstat = os.statvfs(deltadir)
if (dirstat.f_bavail * dirstat.f_bsize) <= long(po.size):
adderror(po, 'Insufficient space in download directory %s '
'to download' % (deltadir,))
continue
try:
text = "(%s/%s): %s" %(i, len(remote_pkgs),
os.path.basename(delta['filename']))
deltafile = po.repo._getFile(url=po.basepath,
relative=delta['filename'],
local=deltapath,
checkfunc=checkfunc,
text=text,
cache=po.repo.cache)
except Errors.RepoError, e:
adderror(po, str(e))
else:
queue.put((conduit, po.localpath, po.arch, deltafile))
if errors.has_key(po):
del errors[po]
# Check for waiting messages from building thread
lock.acquire()
if curthread.messages != "":
conduit.info(2, curthread.messages[:-1])
curthread.messages = ""
lock.release()
conduit.info(2, "Rebuilding rpms from deltarpms")
# Tell build thread that there are no more drpms and wait for it to exit
curthread.can_exit = True
queue.put(None)
curthread.join()
if curthread.messages != "":
conduit.info(2, curthread.messages[:-1])
curthread.messages = ""
return errors
class DeltaInfo(object):
def __init__(self, elem):
self.epoch = elem.get("oldepoch")
self.version = elem.get("oldversion")
self.release = elem.get("oldrelease")
self.filename = self.sequence = self.size = self.checksum = self.checksum_type = None
for x in elem.getchildren():
if x.tag == "checksum":
self.checksum_type = x.get("type")
setattr(self, x.tag, x.text)
def evr(self):
return "%s:%s-%s" %(self.epoch, self.version, self.release)
def __str__(self):
return "filename: %s, sequence: %s, size: %s, checksum (%s) = %s" % (self.filename, self.sequence, self.size, self.checksum_type, self.checksum)
def __getitem__(self, key):
return getattr(self, key)
class NewPackage(object):
def __init__(self, elem):
for prop in ("name", "version", "release", "epoch", "arch"):
setattr(self, prop, elem.get(prop))
self.deltas = {}
for child in elem.getchildren():
if child.tag != "delta":
continue
d = DeltaInfo(child)
self.deltas[d.evr()] = d
def nevra(self):
return "%s-%s:%s-%s.%s" %(self.name, self.epoch, self.version,
self.release, self.arch)
def __str__(self):
return "%s <== %s" % (self.nevra(), self.deltas)
def has_key(self, key):
return self.deltas.has_key(key)
def __getitem__(self, key):
return self.deltas[key]
class PrestoParser(object):
def __init__(self, filename):
self.deltainfo = {}
if filename.endswith(".gz"):
fo = gzip.open(filename)
else:
fo = open(filename, 'rt')
for event, elem in iterparse(fo):
if elem.tag == "newpackage":
p = NewPackage(elem)
self.deltainfo[p.nevra()] = p
def getDeltas(self):
return self.deltainfo
# Configuration stuff
def config_hook(conduit):
# Add --disable-presto option
parser = conduit.getOptParser()
if parser:
parser.add_option('', '--disablepresto', dest='disablepresto',
action='store_true', default=False,
help="disable Presto plugin and don't download any deltarpms")
# Set up Presto repositories
def postreposetup_hook(conduit):
opts, commands = conduit.getCmdLine()
if not opts or not opts.disablepresto:
conduit.info(2, 'Setting up and reading Presto delta metadata')
for active_repo in conduit.getRepos().listEnabled():
try:
deltamd = active_repo.retrieveMD("prestodelta")
except yum.Errors.RepoMDError:
conduit.info(2, "No Presto metadata available for %s" %(active_repo,))
continue
pinfo[active_repo.id] = PrestoParser(deltamd).getDeltas()
else:
conduit.info(5, '--disablepresto specified - Presto disabled')
def predownload_hook(conduit):
opts, commands = conduit.getCmdLine()
if (opts and opts.disablepresto) or len(conduit.getDownloadPackages()) == 0:
return
conduit.info(2, "Downloading DeltaRPMs:")
# Download deltarpms
problems = downloadPkgs(conduit, pinfo)
# If 'exitondownloaderror' is on, exit
if conduit.confBool('main', 'exitondownloaderror') and \
len(problems.keys()) > 0:
errstring = 'Error Downloading DeltaRPMs:\n'
for key in problems.keys():
errors = yum.misc.unique(problems[key])
for error in errors:
errstring += ' %s: %s\n' % (key, error)
raise PluginYumExit(errstring)
# FIXME: would be good to give an idea to people of what they saved
|