Unable to use virt-install in mock

For now I've marked all Fedora VMs to only run builds with matching labels. could you please confirm if the builds stabilized? If so we can re-trigger all failed runs to ensure proper flags are set. Also, let's change the job settings as propsed by and add virt-host-validate to the script to have some debug info available from libvirt.

When using libvirt, we always use libvirtd that is running on the host.

We've been mixing different distros in and out of mock for a while now, so what has changed?

In ay case it is possible to force that job to run mock on a host that runs the saem distro - in v1 its done via node-filter, in v2 its done via host-distribution in runtime-requirements.

Looked at several of the failed jobs, like this one:
https://jenkins.ovirt.org/job/ovirt-appliance_standard-check-patch/35/

Loks like virtualization is on yet the el7 mock is running on a Fedora VM:

+ source /etc/os-release
++ NAME=Fedora
++ VERSION='28 (Cloud Edition)'
...
++ grep vmx
+ [[ -n flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm constant_tsc rep_good nopl cpuid pni pclmulqdq vmx ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes hypervisor lahf_lm pti tpr_shadow vnmi flexpriority ept vpid arat
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm constant_tsc rep_good nopl cpuid pni pclmulqdq vmx ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes hypervisor lahf_lm pti tpr_shadow vnmi flexpriority ept vpid arat ]]
+ is_nested_kvm_enabled
+ local i_nested_path=/sys/module/kvm_intel/parameters/nested
+ [[ -f /sys/module/kvm_intel/parameters/nested ]]
++ cat /sys/module/kvm_intel/parameters/nested
+ [[ Y != \N ]]
+ return 0

Later inside the mock we fail:

2018-12-18 12:45:29,564: Running virt-install.
ERROR Host does not support any virtualization options

Are we using the host's libvirt in the mock? If so, how do we add a node label limit for the check-patch parts of this job?