On Fri, 24 Oct 2014, John D. Baker wrote:
As a result, all the sets seem to be archives of the entire DESTDIR with
most files being zero-length, differing primarily by containing a non-
zero-length instance of their own "./etc/mtree/set.foo" file. They all
contain the files that should only be in the "etc.tgz" set.
The various "set.foo" files looked very close in size (as are all of the
set archives themselves). All of the "set.foo" files differ from one
another only in which "set.foo" file has an entry in it and that some
otherwise identical entries differ only by the word "optional" at the
end. They are otherwise line-by-line identical.