$ git clone -n https://src.fedoraproject.org/rpms/derrick.git /var/lib/mock/f31-build-100700-33299/root/chroot_tmpdir/scmroot/derrick
Cloning into '/var/lib/mock/f31-build-100700-33299/root/chroot_tmpdir/scmroot/derrick'...
$ git reset --hard def134c1cdbfc3ce3ef395cbbe6cb12a5db7105a
HEAD is now at def134c - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild