$ git clone -n https://src.fedoraproject.org/rpms/speed-dreams.git /var/lib/mock/f31-build-52936-27781/root/chroot_tmpdir/scmroot/speed-dreams
Cloning into '/var/lib/mock/f31-build-52936-27781/root/chroot_tmpdir/scmroot/speed-dreams'...
$ git reset --hard f31a5a0961a2378efe6c779774a22ea94360a00d
HEAD is now at f31a5a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild