$ git clone -n https://src.fedoraproject.org/rpms/wireshark.git /var/lib/mock/f40-build-804683-144588/root/chroot_tmpdir/scmroot/wireshark
Cloning into '/var/lib/mock/f40-build-804683-144588/root/chroot_tmpdir/scmroot/wireshark'...
$ git fetch origin c1bfdd179159afeadb46b8df9dc2ee03644662d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wireshark
 * [new ref]         c1bfdd179159afeadb46b8df9dc2ee03644662d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1bfdd1 New version 4.2.3