2019-07-27 22:11:33,120 [INFO] {28130} koji.build.buildroot:505 Running mock as kojibuilder INFO: mock.py version 1.4.14 starting (python version = 3.7.3)... Start: init plugins INFO: selinux enabled Finish: init plugins Start: run Start: clean chroot Finish: clean chroot Start: chroot init INFO: calling preinit hooks INFO: enabled HW Info plugin Mock Version: 1.4.14 INFO: Mock Version: 1.4.14 Start: dnf install ERROR: Command failed: # /usr/bin/dnf --installroot /var/lib/mock/f31-build-61004-28788/root/ --setopt=install_weak_deps=0 groupinstall build --setopt=tsflags=nocontexts Unable to detect release version (use '--releasever' to specify release version)