$ git clone -n https://src.fedoraproject.org/rpms/R-unix.git /var/lib/mock/f31-build-100630-33292/root/chroot_tmpdir/scmroot/R-unix
Cloning into '/var/lib/mock/f31-build-100630-33292/root/chroot_tmpdir/scmroot/R-unix'...
$ git reset --hard 0918fd77b27ad622ace2be4b9180a237009000ce
HEAD is now at 0918fd7 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild