2020-06-02 11:03:10,582 [INFO] {92096} koji.build.buildroot:530 Running mock as kojibuilder
INFO: mock.py version 2.2 starting (python version = 3.6.8)...
INFO: Using 'yum' instead of 'dnf' for bootstrap chroot
Start(bootstrap): init plugins
INFO: selinux disabled
Finish(bootstrap): init plugins
Start: init plugins
INFO: selinux disabled
Finish: init plugins
INFO: Signal handler active
Start: run
Start: clean chroot
Finish: clean chroot
Start(bootstrap): chroot init
INFO: calling preinit hooks
INFO: enabled HW Info plugin
Mock Version: 2.2
INFO: Mock Version: 2.2
Start(bootstrap): yum install
ERROR: Command failed: 
 # /usr/bin/yum --installroot /var/lib/mock/v8.1-testing-2137-1668-bootstrap/root/ install dnf dnf-plugins-core
Failed to set locale, defaulting to C
Error: Nothing to do