$ git clone -n https://src.fedoraproject.org/rpms/erlang-emmap.git /var/lib/mock/f45-build-8275-383/root/chroot_tmpdir/scmroot/erlang-emmap
Cloning into '/var/lib/mock/f45-build-8275-383/root/chroot_tmpdir/scmroot/erlang-emmap'...
$ git fetch origin fa3c3a255bebf5767f16541d0acfae8ddae7f70a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-emmap
 * [new ref]         fa3c3a255bebf5767f16541d0acfae8ddae7f70a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa3c3a2 Fix FTBFS