$ mount -t none -o bind /compose/ /var/lib/mock/dist-c8-build-69091-18798/root/compose
$ mount -t none -o bind /mnt/koji/ /var/lib/mock/dist-c8-build-69091-18798/root/mnt/koji
$ mount -t none -o bind /compose/trees/CentOS-Stream-8-20210423.n.3 /var/lib/mock/dist-c8-build-69091-18798/root/compose/trees/CentOS-Stream-8-20210423.n.3