$ git clone -n https://src.fedoraproject.org/rpms/R-backports.git /var/lib/mock/f31-build-73777-31033/root/chroot_tmpdir/scmroot/R-backports
Cloning into '/var/lib/mock/f31-build-73777-31033/root/chroot_tmpdir/scmroot/R-backports'...
$ git reset --hard 3309ef817904dafb3f6b61450f9218a1aaf3c61f
HEAD is now at 3309ef8 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild