$ git clone -n https://src.fedoraproject.org/rpms/R-rjson.git /var/lib/mock/f37-build-641517-71970/root/chroot_tmpdir/scmroot/R-rjson
Cloning into '/var/lib/mock/f37-build-641517-71970/root/chroot_tmpdir/scmroot/R-rjson'...
$ git reset --hard b8d347026e0bb6727884775990ba8bc87b87cdab
HEAD is now at b8d3470 update to 0.2.21, rebuild for R 4.2.1