$ git clone -n https://src.fedoraproject.org/rpms/R-rjson.git /var/lib/mock/f38-build-720972-98007/root/chroot_tmpdir/scmroot/R-rjson
Cloning into '/var/lib/mock/f38-build-720972-98007/root/chroot_tmpdir/scmroot/R-rjson'...
$ git reset --hard 15f315b576c1e37cd4faef8ab93f2c534da4450f
HEAD is now at 15f315b Fix BuildRequires