From: Daniel Brumbaugh Keeney <devi.webmaster@...>
Date: 2008-03-11T02:04:08+09:00
Subject: Re: Getting files out of a .tar.gz archive

On Mon, Mar 10, 2008 at 9:09 AM, celldee <celldee@gmail.com> wrote:
> 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
>
>

Use the docs.

From Minitar's readme:
tgz = Zlib::GzipReader.new(File.open('test.tgz', 'rb'))
# Warning: tgz and the file will be closed.
Minitar.unpack(tgz, 'x')

For GZip and the rest of the standard library,
http://www.ruby-doc.org/stdlib/

Daniel Brumbaugh Keeney