From: celldee <celldee@...>
Date: 2008-03-10T23:09:12+09:00
Subject: Getting files out of a .tar.gz archive

Hi,

I have a .tar.gz file containing some xml files. I need to locate
particular files in the archive and process them. I'm looking for a
pure Ruby way to do this without resorting to external system
commands.

I found Archive::Tar::Minitar that allows me to process my files once
I have expanded the .tar.gz file to a .tar file. So I can do this :-

open(@tarfile, "rb") do |f|
  Archive::Tar::Minitar::Reader.open(f).each do |entry|
    fpl = StringIO.new( entry.read) if entry.name =~ /
#{@date}#{channel}_pl/
    fpi = StringIO.new( entry.read) if entry.name =~ /
#{@date}#{channel}_pi/
  end
end

However, in order to get a tar file, I have to call gunzip to expand
my .tar.gz file. Does anybody know of a way for me to replace the
gunzip call with a Ruby library call of some sort? Or does anyone have
suggestions for an alternative way to do this?

Cheers,

Chris
http://smuby.org