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#!/usr/bin/python
# dmd - Generate and apply deltas between repository metadata
#
# Copyright (C) 2007 James Bowes <jbowes@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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
import sys
from lxml.etree import parse, tostring, Element
class MdType(object):
def __init__(self, namespace, rootelem):
self.ns = "http://linux.duke.edu/metadata/%s" % namespace
self.sns = "{%s}" % self.ns
self.deltasns = "{http://linux.duke.edu/metadata/delta}"
self.root = rootelem
def get_pkg_id(self, pkg):
return pkg.findtext(self.sns + "checksum")
def make_hash(self, tree):
pkgshash = {}
for pkg in tree:
pkgid = self.get_pkg_id(pkg)
pkgshash[pkgid] = pkg
return pkgshash
def make_pkg_elem(self, pkgid, pkg):
pkgelem = Element("package")
pkgelem.set('name', pkg.findtext(self.sns + 'name'))
pkgelem.set('arch', pkg.findtext(self.sns + 'arch'))
pkgelem.set('pkgid', pkgid)
verelem = pkg.find(self.sns + 'version')
verelem.tag = "version"
pkgelem.append(verelem)
return pkgelem
def diff_trees(self, oldtree, newtree):
oldpkgs = oldtree.getroot().getchildren()
newpkgs = newtree.getroot().getchildren()
oldpkgshash = self.make_hash(oldpkgs)
newpkgshash = self.make_hash(newpkgs)
diff = Element(self.root,
nsmap = {None : self.ns,
"rpm" : "http://linux.duke.edu/metadata/rpm",
"delta" : "http://linux.duke.edu/metadata/delta"})
additions = Element("delta:additions")
diff.append(additions)
removals = Element("delta:removals")
diff.append(removals)
for pkgid, pkg in newpkgshash.iteritems():
if not oldpkgshash.has_key(pkgid):
additions.append(pkg)
for pkgid, pkg in oldpkgshash.iteritems():
if not newpkgshash.has_key(pkgid):
pkgelem = self.make_pkg_elem(pkgid, pkg)
removals.append(pkgelem)
diff.set("packages", str(len(removals) + len(additions)))
print tostring(diff, pretty_print=True)
def patch_tree(self, oldtree, deltatree):
oldroot = oldtree.getroot()
oldpkgs = oldroot.getchildren()
oldpkgshash = self.make_hash(oldpkgs)
additions = deltatree.find(self.deltasns + 'additions').getchildren()
removals = deltatree.find(self.deltasns + 'removals').getchildren()
for pkg in additions:
pkgid = self.get_pkg_id(pkg)
if oldpkgshash.has_key(pkgid):
print >> sys.stderr, "Package %s already exists" % pkgid
sys.exit(1)
oldroot.append(pkg)
for pkg in removals:
pkgid = pkg.get('pkgid')
if not oldpkgshash.has_key(pkgid):
print >> sys.stderr, "Package %s does not exist" % pkgid
sys.exit(1)
oldroot.remove(oldpkgshash[pkgid])
oldcount = int(oldroot.get('packages'))
newcount = oldcount + len(additions) - len(removals)
oldroot.set('packages', str(newcount))
print tostring(oldtree, pretty_print=True)
class OtherMdType(MdType):
def get_pkg_id(self, pkg):
return pkg.get('pkgid')
def make_pkg_elem(self, pkgid, pkg):
pkgelem = Element("package")
pkgelem.set('name', pkg.get('name'))
pkgelem.set('arch', pkg.get('arch'))
pkgelem.set('pkgid', pkgid)
verelem = pkg.find(self.sns + 'version')
verelem.tag = "version"
return pkgelem
mdtypeinfo = {
'primary' : MdType('common', 'metadata'),
'filelists' : OtherMdType('filelists', 'filelists'),
'other' : OtherMdType('other', 'other'),
}
def usage(progname):
print "usage: %s [diff|patch] MDTYPE FILE1 FILE2" % progname
sys.exit()
def main(args):
if len(args) != 5:
usage(args[0])
if args[1] not in ('diff', 'patch'):
usage(args[0])
if args[2] not in ('primary', 'filelists', 'other'):
usage(args[0])
oldtree = parse(args[3])
newtree = parse(args[4])
if args[1] == 'diff':
mdtypeinfo[args[2]].diff_trees(oldtree, newtree)
else:
mdtypeinfo[args[2]].patch_tree(oldtree, newtree)
if __name__ == "__main__":
main(sys.argv)
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