$ git clone -n https://src.fedoraproject.org/rpms/R-sys.git /var/lib/mock/f31-build-74240-31099/root/chroot_tmpdir/scmroot/R-sys
Cloning into '/var/lib/mock/f31-build-74240-31099/root/chroot_tmpdir/scmroot/R-sys'...
$ git reset --hard 29fd052a351dffcca55f80c73fdac72e4ca5c402
HEAD is now at 29fd052 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild