$ git clone -n https://src.fedoraproject.org/rpms/R-udunits2.git /var/lib/mock/f39-build-1535623-36247/root/chroot_tmpdir/scmroot/R-udunits2
Cloning into '/var/lib/mock/f39-build-1535623-36247/root/chroot_tmpdir/scmroot/R-udunits2'...
$ git fetch origin 98405da51dad362eb1bb56f10442ab46b5d7e9a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-udunits2
 * [new ref]         98405da51dad362eb1bb56f10442ab46b5d7e9a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98405da Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild