$ git clone -n https://src.fedoraproject.org/rpms/R-BufferedMatrix.git /var/lib/mock/f38-build-686387-81224/root/chroot_tmpdir/scmroot/R-BufferedMatrix
Cloning into '/var/lib/mock/f38-build-686387-81224/root/chroot_tmpdir/scmroot/R-BufferedMatrix'...
$ git reset --hard e04a1718c914f2cf57c54cf5b6cc39e918d7d634
HEAD is now at e04a171 actually build against R 4.2.1