$ git clone -n https://src.fedoraproject.org/rpms/R-later.git /var/lib/mock/f31-build-74009-31063/root/chroot_tmpdir/scmroot/R-later
Cloning into '/var/lib/mock/f31-build-74009-31063/root/chroot_tmpdir/scmroot/R-later'...
$ git reset --hard c7771f39980ab5abe24bf6d9257a6fd99c3b7afb
HEAD is now at c7771f3 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild