From: Simon Mullis <simon@...>
Date: 2007-09-28T23:44:47+09:00
Subject: Re: repost: minitar - how to extract only one file from a tar archive as an object

Hi

Anyone have any examples of using rubyzip with a stringio object of a
zip (that I've just extracted from elsewhere using Minitar)...

I cannot seem to force it to accept a non-File object.

Anyone offer any inspiration?

Thanks

SM

On 9/28/07, Simon Mullis <simon@mullis.co.uk> wrote:
> Great! This is exactly what I was looking for!
>
> Thankyou.
>
> SM
>
> On 9/28/07, Raf Coremans <rrafje@gmail.com> wrote:
> > 2007/9/28, Simon Mullis <simon@mullis.co.uk>:
> > >
> > > trying again....
> > >
> > > ;-)
> > >
> > > SM
> > >
> > > ---------- Forwarded message ----------
> > > From: Simon Mullis <simon@mullis.co.uk>
> > > Date: Sep 27, 2007 4:16 PM
> > > Subject: minitar - how to extract only one file from a tar archive as an
> > > object
> > > To: ruby-talk@ruby-lang.org
> > >
> > >
> > > Ahoy there, fellow rubyphiles...
> > >
> > > I'm trying to use Archive::Tar::Minitar to extract a single file from
> > > a tar archive:
> > >
> > > "test.tar" contains:
> > >
> > > ./test/foo
> > > ./test/bar
> > > ./test/baz
> > >
> > > <code>
> > > # lifted from the minitar source...
> > > require 'archive/tar/minitar'
> > > include Archive::Tar
> > >
> > > a = File.open("test.tar", "rb")
> > > Minitar::Input.open(a) do |inp|
> > >     inp.each do |entry|
> > >        inp.extract_entry(".", entry) if entry.full_name =~ /baz/
> > >     end
> > > end
> > > </code>
> > >
> > > This all works fine, and writes to "./test/baz"
> > >
> > > But!
> > >
> > > How could I do the same and create a File object of the extracted
> > > file? (i.e. not write anything to disk).
> > >
> > > (The reason I ask is the file I want is a zip, which lives inside the
> > > tar archive and I then want to grab some files from that using the
> > > 'rubyzip' gem.)
> > >
> > > It's quite possible (in fact, more than likely) that I've missed
> > > something obvious and there is already a straightforward way to do
> > > this.
> > >
> > > To be honest, a few more examples of minitar in use would be great.
> > >
> > > Many thanks in advance for any pointers or tips.
> > >
> > > Cheers!
> > >
> > > --
> > > Simon Mullis
> > > _________________
> > > simon@mullis.co.uk
> > >
> > >
> >
> > Hi,
> >
> >
> > Use entry.read instead of inp.extract_entry; this will not extract the file
> > to disk, but returns its contents as a string. And if wanted, you can wrap
> > that string in a StringIO to get a file-like object:
> >
> > require 'archive/tar/minitar'
> > include Archive::Tar
> >
> > require 'stringio'
> >
> > a = File.open("test.tar", "rb")
> > Minitar::Input.open(a) do |inp|
> >   inp.each do |entry|
> >     if entry.full_name =~ /baz/
> >       f = StringIO.new( entry.read)
> >       #Do something useful with f
> >     end
> >   end
> > end
> >
> >
> > Regards,
> > Raf
> >
>
>
> --
> Simon Mullis
> _________________
> simon@mullis.co.uk
>
>


-- 
Simon Mullis
_________________
simon@mullis.co.uk