$ git clone -n https://src.fedoraproject.org/rpms/erlang-stun.git /var/lib/mock/f45-build-8479-389/root/chroot_tmpdir/scmroot/erlang-stun
Cloning into '/var/lib/mock/f45-build-8479-389/root/chroot_tmpdir/scmroot/erlang-stun'...
$ git fetch origin ff64d44bba9f35cec69935e984e4ceec02c9e7a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-stun
 * [new ref]         ff64d44bba9f35cec69935e984e4ceec02c9e7a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff64d44 stun ver. 1.2.23