$ git clone -n https://src.fedoraproject.org/rpms/jackson-bom.git /var/lib/mock/f38-build-side-42-init-devel-618085-26325/root/chroot_tmpdir/scmroot/jackson-bom
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-618085-26325/root/chroot_tmpdir/scmroot/jackson-bom'...
$ git fetch origin ad5128222aca0aee5d5ec878ba5c4cfbc10b31ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jackson-bom
 * [new ref]         ad5128222aca0aee5d5ec878ba5c4cfbc10b31ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad51282 Update to version 2.14.2