$ git clone -n https://src.fedoraproject.org/forks/packit/rpms/jackson-parent.git /var/lib/mock/f43-build-59083541-6570956/root/chroot_tmpdir/scmroot/jackson-parent
Cloning into '/var/lib/mock/f43-build-59083541-6570956/root/chroot_tmpdir/scmroot/jackson-parent'...
$ git fetch origin 429b9aa8aa19b0c37b697fb261762dd47aa689b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/packit/rpms/jackson-parent
 * [new ref]         429b9aa8aa19b0c37b697fb261762dd47aa689b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 429b9aa Update to 2.19 upstream release