$ git clone -n https://src.fedoraproject.org/rpms/fedora-dockerfiles.git /var/lib/mock/f31-build-72521-30818/root/thebuilddir/tmp/scmroot/fedora-dockerfiles
Cloning into '/var/lib/mock/f31-build-72521-30818/root/thebuilddir/tmp/scmroot/fedora-dockerfiles'...
$ git reset --hard 22d222e251f971e7ae5796f63edf88b3c096c2e3
HEAD is now at 22d222e - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild