$ git clone -n https://src.fedoraproject.org/rpms/se-sandbox-runner.git /var/lib/mock/f29-build-6178-1516/root/thebuilddir/tmp/scmroot/se-sandbox-runner
Cloning into '/var/lib/mock/f29-build-6178-1516/root/thebuilddir/tmp/scmroot/se-sandbox-runner'...
$ git reset --hard cf54f3dcd92c4d8341db55a04a5120c074dc2864
HEAD is now at cf54f3d - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild