$ git clone -n https://src.fedoraproject.org/rpms/R-BufferedMatrix.git /var/lib/mock/f31-build-76332-31396/root/chroot_tmpdir/scmroot/R-BufferedMatrix
Cloning into '/var/lib/mock/f31-build-76332-31396/root/chroot_tmpdir/scmroot/R-BufferedMatrix'...
$ git reset --hard 158f1f68ec4c599a1f2fba0b4ea84f06642f7aa8
HEAD is now at 158f1f6 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild