$ git clone -n https://src.fedoraproject.org/rpms/wireshark.git /var/lib/mock/f40-build-1512547-23909/root/chroot_tmpdir/scmroot/wireshark
Cloning into '/var/lib/mock/f40-build-1512547-23909/root/chroot_tmpdir/scmroot/wireshark'...
$ git fetch origin 3340f08b9f25115e65900e64ac3ddb78ea967444:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wireshark
 * [new ref]         3340f08b9f25115e65900e64ac3ddb78ea967444 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3340f08 New version 4.2.6