$ git clone -n https://src.fedoraproject.org/rpms/klog.git /var/lib/mock/f45-build-15255-471/root/chroot_tmpdir/scmroot/klog
Cloning into '/var/lib/mock/f45-build-15255-471/root/chroot_tmpdir/scmroot/klog'...
$ git fetch origin bff0b4d7004a92096cac50d37abe1560ce41857a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/klog
 * [new ref]         bff0b4d7004a92096cac50d37abe1560ce41857a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bff0b4d Update to 2.6.