diff --git a/osc-plugin-checkupdate.py b/osc-plugin-checkupdate.py
new file mode 100644
index 00000000..3870a142
--- /dev/null
+++ b/osc-plugin-checkupdate.py
@@ -0,0 +1,189 @@
+# Copyright (c) 2012,2013 SUSE Linux Products GmbH
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+def _xxx_diff_filter_changes(self, diff):
+    lines = []
+    ischanges = False
+    for line in diff.split('\n'):
+        if not len(line):
+            continue
+
+        if line.startswith('--- '):
+            fn = line[4:]
+            if ' ' in fn:
+                fn=fn[0:fn.index(' ')]
+            if fn.endswith('.changes'):
+                ischanges = True
+            else:
+                ischanges = False
+
+        if ischanges:
+            lines.append(line)
+
+    return lines
+
+@cmdln.option('--project', action='store', help='project')
+@cmdln.alias('killupdate')
+def do_checkupdate(self, subcmd, opts, *args):
+    """
+    compare packages in XX.X:Update with those in XX.X
+      osc checkupdate
+    delete an update
+      osc killupdate INCIDENTNUMBER
+    """
+    CHECK = 1
+    KILL = 2
+    mode = CHECK
+
+    if subcmd == 'checkupdate':
+        mode = CHECK
+    elif subcmd == 'killupdate':
+        mode = KILL
+        if len(args) > 0:
+            num = int(args[0])
+        else:
+            raise oscerr.WrongArgs('specify incident number')
+    else:
+        raise oscerr.WrongArgs('invalid command')
+
+
+    if opts.project:
+        dprj = opts.project
+    else:
+        dprj = "openSUSE:13.1"
+    prj = dprj+":Update"
+
+    msg = "cleanup for RC1"
+
+    apiurl = self.get_api_url()
+    pkgs = meta_get_packagelist(apiurl, prj)
+
+    number_re = re.compile(r".*\.(\d+)$")
+
+    if mode == CHECK:
+        print "running diff %s %s"%(prj, dprj)
+
+    todel = []
+    for p in pkgs:
+        if mode == KILL:
+            sfx=".%d"%num
+            if p.endswith(sfx):
+                try:
+                    url = makeurl(apiurl, ['build', prj, 'standard', 'i586', p])
+                    f = http_GET(url)
+                    root = ET.parse(f).getroot()
+                    for node in root.findall('binary'):
+                        fn = node.get('filename')
+                        if not fn.endswith('.src.rpm'):
+                            continue
+                        print 'src:', fn[:-len('.src.rpm')]
+                except urllib2.HTTPError, e:
+                    if e.code != 404:
+                        print "error:", e
+                        continue
+                    print "no binaries found"
+                print "delete %s"%p
+                delete_package(apiurl, prj, p, False, msg)
+                if not p.startswith('patchinfo.'):
+                    pn = p[:-len(sfx)]
+                    print "delete %s"%pn
+                    try:
+                        True
+                        delete_package(apiurl, prj, pn, False, msg)
+                    except urllib2.HTTPError, e:
+                        if e.code == 404:
+                            print "not found, skip"
+                            continue
+                        raise e
+        elif mode == CHECK:
+            islink = False
+            locallink = False
+            linktomain = False
+            incidentnr = None
+
+            # XXX: should check type instead
+            if p.startswith("patchinfo."):
+                continue
+
+            print "checking %s" % p
+
+            url = makeurl(apiurl, ['source', prj, p, '_link'])
+            try:
+                f = http_GET(url)
+                islink = True
+                root = ET.parse(f).getroot()
+                linkprj = root.get('project')
+                linkpkg = root.get('package')
+                if not linkprj or linkprj == prj:
+                    locallink = True
+                    # ignore links to main package
+                    m1 = number_re.match(p)
+                    m2 = number_re.match(linkpkg)
+                    if m1 and m2 and m1.groups()[0] == m2.groups()[0]:
+                        linktomain = True
+                    incidentnr = m2.groups()[0]
+            except urllib2.HTTPError, e:
+                if e.code != 404:
+                    print "error:", e
+                    continue
+                else:
+                    # ignore not linked packages for now
+                    islink = False
+
+            if not islink or linktomain:
+                continue
+
+            try:
+                diff = server_diff(apiurl, prj, p, None, dprj, p, None)
+            except urllib2.HTTPError, e:
+                print "error:", e
+                continue
+
+            if diff:
+                added = 0
+                removed = 0
+                ischanges = False
+                for line in diff.split('\n'):
+                    if not len(line):
+                        continue
+
+                    if line.startswith('--- '):
+                        fn = line[4:]
+                        if ' ' in fn:
+                            fn=fn[0:fn.index(' ')]
+                        if fn.endswith('.changes'):
+                            ischanges = True
+                        else:
+                            ischanges = False
+
+                    if line.startswith('--- ') or line.startswith('+++ '):
+                        continue
+
+                    if ischanges:
+                        if line[0] == '+':
+                            added += 1
+                        elif line[0] == '-':
+                            removed += 1
+
+                print "+++ %s: %s has changes (%d+, %d-)" % (incidentnr, p, added, removed)
+            else:
+                print "%s: %s ok" % (incidentnr, p)
+
+# vim: sw=4 et