$ git clone -n https://src.fedoraproject.org/rpms/tcpdump.git /var/lib/mock/f41-build-side-1-2670543-29059/root/chroot_tmpdir/scmroot/tcpdump
Cloning into '/var/lib/mock/f41-build-side-1-2670543-29059/root/chroot_tmpdir/scmroot/tcpdump'...
$ git fetch origin 69ceb2a3e560cd5a5ea383ea485bdcf8bd65b69d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcpdump
 * [new ref]         69ceb2a3e560cd5a5ea383ea485bdcf8bd65b69d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69ceb2a New version 4.99.5