$ git clone -n https://src.fedoraproject.org/rpms/R-expm.git /var/lib/mock/f31-build-85425-31601/root/chroot_tmpdir/scmroot/R-expm
Cloning into '/var/lib/mock/f31-build-85425-31601/root/chroot_tmpdir/scmroot/R-expm'...
$ git reset --hard f945b03170afb4a47c1c467ecf129448a5c998cc
HEAD is now at f945b03 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild