$ git clone -n https://src.fedoraproject.org/rpms/jaxb-fi.git /var/lib/mock/f39-build-1977544-43332/root/chroot_tmpdir/scmroot/jaxb-fi
Cloning into '/var/lib/mock/f39-build-1977544-43332/root/chroot_tmpdir/scmroot/jaxb-fi'...
$ git fetch origin 4dd42a038d5652796d454ecae45898c6eae42a6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-fi
 * [new ref]         4dd42a038d5652796d454ecae45898c6eae42a6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4dd42a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild