2019-08-15 09:35:02,647 [INFO] {21238} 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-94968-32511/root/ --setopt=install_weak_deps=0 groupinstall build --setopt=tsflags=nocontexts Unable to detect release version (use '--releasever' to specify release version) Last metadata expiration check: 0:06:35 ago on Thu 15 Aug 2019 09:37:00 AM EDT.