$ git clone -n https://src.fedoraproject.org/rpms/util-linux.git /var/lib/mock/f43-build-side-115115-61062802-6588380/root/chroot_tmpdir/scmroot/util-linux
Cloning into '/var/lib/mock/f43-build-side-115115-61062802-6588380/root/chroot_tmpdir/scmroot/util-linux'...
$ git fetch origin 164a6760ec0921afe1f043a6d08505636ca1bded:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/util-linux
 * [new ref]         164a6760ec0921afe1f043a6d08505636ca1bded -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 164a676 enable lastlog2-import.service