$ git clone -n https://src.fedoraproject.org/rpms/R-BufferedMatrix.git /var/lib/mock/f31-build-49600-27316/root/chroot_tmpdir/scmroot/R-BufferedMatrix
Cloning into '/var/lib/mock/f31-build-49600-27316/root/chroot_tmpdir/scmroot/R-BufferedMatrix'...
$ git reset --hard 5915990ff96ed6d993ff34e095bcf778754ff6b4
HEAD is now at 5915990 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild