$ git clone -n https://src.fedoraproject.org/rpms/R-unitizer /var/lib/mock/f39-build-1584029-38131/root/chroot_tmpdir/scmroot/R-unitizer
Cloning into '/var/lib/mock/f39-build-1584029-38131/root/chroot_tmpdir/scmroot/R-unitizer'...
$ git fetch origin beae7b59586b8678d889f207b23285274e8dc3fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-unitizer
 * [new ref]         beae7b59586b8678d889f207b23285274e8dc3fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at beae7b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild