$ git clone -n https://src.fedoraproject.org/rpms/R-polynom.git /var/lib/mock/f39-build-1544602-36653/root/chroot_tmpdir/scmroot/R-polynom
Cloning into '/var/lib/mock/f39-build-1544602-36653/root/chroot_tmpdir/scmroot/R-polynom'...
$ git fetch origin ad2b77861db32b33a9b2f9e301a83a75861c5429:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-polynom
 * [new ref]         ad2b77861db32b33a9b2f9e301a83a75861c5429 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad2b778 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild