$ git clone -n https://src.fedoraproject.org/rpms/R-rjson.git /var/lib/mock/f41-build-820821-152366/root/chroot_tmpdir/scmroot/R-rjson
Cloning into '/var/lib/mock/f41-build-820821-152366/root/chroot_tmpdir/scmroot/R-rjson'...
$ git fetch origin cecb9331a7c537607915ed256ce4ae1a3fb97f31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rjson
 * [new ref]         cecb9331a7c537607915ed256ce4ae1a3fb97f31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cecb933 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild