From: "Ben U." <ben@...>
Date: 2011-02-28T13:24:04+09:00
Subject: Re: Running GzipWriter on same input produces different output

I think the reason for this is because gzip saves the original filename 
and timestamp. If no timestamp is present gzip uses the gzip file 
creation time.

If you want the files to be the same, as I did, you can set the 
modification time when using GzipWriter. I.e.:

require 'zlib'

Zlib::GzipWriter.open('/tmp/file.gz') do |gz|
  gz.mtime = 1
  gz.write "contents"
end

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