$ git clone -n https://src.fedoraproject.org/rpms/jackson-parent.git /var/lib/mock/f40-build-2227126-53001/root/chroot_tmpdir/scmroot/jackson-parent
Cloning into '/var/lib/mock/f40-build-2227126-53001/root/chroot_tmpdir/scmroot/jackson-parent'...
$ git fetch origin 806f7d44957321acabc7320261085dd1caf98bcf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jackson-parent
 * [new ref]         806f7d44957321acabc7320261085dd1caf98bcf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 806f7d4 [packit] 2.16 upstream release