$ git clone -n https://src.fedoraproject.org/rpms/R-preprocessCore.git /var/lib/mock/f31-build-50476-27412/root/chroot_tmpdir/scmroot/R-preprocessCore
Cloning into '/var/lib/mock/f31-build-50476-27412/root/chroot_tmpdir/scmroot/R-preprocessCore'...
$ git reset --hard c9c1bf9d0a21c0b41e703bd9241c718f31722f99
HEAD is now at c9c1bf9 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild