Description of problem:
virDomainBlockCopy cannot get a right flag when use libvirt_virDomainBlockCopy
(although cannot use virDomainBlockCopy in 1.2.8,but we can use upstream libvirt-1.2.9 to reproduce this issue or use gdb to reproduce this issue with libvirt-1.2.8-5.el7)

Version-Release number of selected component (if applicable):
libvirt-1.2.8-5.el7
libvirt-python-1.2.8-4.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.# cat blockcopy.py 

import libvirt
import sys

con = libvirt.open()
domain = con.lookupByName(sys.argv[1])
print   domain.blockCopy("hda","<disk type='file' device='disk'><driver name='qemu' type='raw' cache='none'/><source file='/tmp/test3.img'/></disk>",flags=0)

2.# gdb python
(gdb) br virDomainBlockCopy
Function "virDomainBlockCopy" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (virDomainBlockCopy) pending.
(gdb) r blockcopy.py test3

Breakpoint 1, virDomainBlockCopy (dom=dom@entry=0x7559b0, 
    disk=0x7ffff7eda2fc "hda", 
    destxml=0x7ffff7f8fb04 "<disk type='file' device='disk'><driver name='qemu' type='raw' cache='none'/><source file='/tmp/test3.img'/></disk>", params=0x0, 
    nparams=0, flags=32767) at libvirt.c:20069
(gdb) p flags
$1 = 32767

3.

Actual results:
Although we give flags=0
but flags always be 32767(or another value) this will make this function cannot work well with libvirt-1.2.9 and we will get error like:

unsupported flags (0x7f6c) in function qemuDomainBlockCopy

Expected results:
(gdb) p flags
$1 = 0

Additional info:


When use blockCopy, flags cannot get a right value, because
PyArg_ParseTuple want to get 6 parameters and blockCopy only
pass 5.So flags cannot get a right value:

in /usr/lib64/python2.7/site-packages/libvirt.py +637

 637     def blockCopy(self, disk, destxml, params=None, flags=0):
 638         """Copy the guest-visible contents of a disk image to a new file described by destxml """
 639         ret = libvirtmod.virDomainBlockCopy(self._o, disk, destxml, params, flags)
 640         if ret == -1: raise libvirtError ('virDomainBlockCopy() failed', dom=self)
 641         return ret
 642 


in /usr/src/debug/libvirt-python-1.2.8/libvirt-override.c +8111

8111     if (!PyArg_ParseTuple(args, (char *) "Ozz|Oi:virDomainBlockCopy",
8112                           &pyobj_dom, &disk, &destxml, &pyobj_dict, &params     ,
8113                           &flags))
8114         return VIR_PY_INT_FAIL;


Flags will get a unpredictable value, this will make
this function cannot be used.And error just like:

unsupported flags (0x7f6c) in function qemuDomainBlockCopy

I have send my patch to upstream:

https://www.redhat.com/archives/libvir-list/2014-October/msg00575.html