$ git clone -n https://src.fedoraproject.org/rpms/derrick.git /var/lib/mock/f31-build-58915-28508/root/chroot_tmpdir/scmroot/derrick
Cloning into '/var/lib/mock/f31-build-58915-28508/root/chroot_tmpdir/scmroot/derrick'...
$ git reset --hard b89e27e4e065c389120f815de343f8f747f089bc
HEAD is now at b89e27e - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild