Over root-squashing nfs, when virFileOperation() is called as uid==0,
it may fail with EACCES, but also with EPERM, due to
virFileOperationNoFork()'s failed attemp to chown a writable file.
qemudDomainSaveFlag() should expect this case, too.
qemudOpenAsUID is intended to open a file with the credentials of a
specified uid. Current implementation fails if the file is accessible to
one of uid's groups but not owned by uid.
This patch replaces the supplementary group list that the child process
inherited from libvirtd with the default group list of uid.
Vdsm needs to communicate with its guest agent via unix domain socket,
which qemu creates due to the following domain xml device:
<channel type='unix'>
<target type='virtio' name='com.redhat.rhevm.vdsm'/>
<source mode='bind' path='/var/lib/libvirt/qemu/channels/fcp-xp-1.com.redhat.rhevm.vdsm'/>
</channel>
The location of the socket below /var/lib/libvirt/qemu/channels makes
sense, to humans and selinux policy alike. However, that socket should
be accessible to vdsm, too.
Due to other (storage) reasons, vdsm is to join the "qemu" group. With
this patch, vdsm can look below /var/lib/libvirt/qemu and connect to the
socket.
The socket itself should be chmod'ed to allow qemu group read/write, but
that's for another project.
BZ#643407
suggested by danpb on irc, patch by danken fixed for proper C syntax
* python/libvirt-override.c: on event callback release the python
interpreter lock and take it again when coming back so that the
callback can reinvoke libvirt.
Without this, after few weeks without use, each defined domain grows a
tail of empty gzipped logs, instead of keeping just the last log of
interest.
* daemon/libvirtd.logrotate.in: only rotate when the log is over 100 KBytes
* docs/examples/python/domstart.py python/tests/create.py:
The two example were broken as they needed full-access connection
but only opened read-only connections
Dan Kenigsberg