$ git clone -n https://src.fedoraproject.org/rpms/dovecot.git /var/lib/mock/f40-build-2197889-51685/root/chroot_tmpdir/scmroot/dovecot
Cloning into '/var/lib/mock/f40-build-2197889-51685/root/chroot_tmpdir/scmroot/dovecot'...
$ git fetch origin 87aba78b82d390aab08295759d6aa27423c0bc4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dovecot
 * [new ref]         87aba78b82d390aab08295759d6aa27423c0bc4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87aba78 drop lucene to reduce dependency, use solr for fts instead