From: Jon Lim <snowblink@...>
Date: 2006-06-20T20:13:22+09:00
Subject: Re: Installing irb in Ubuntu

The data in the meta package is wrong.
Therefore, you cannot believe the Version output from apt-cache show.

ruby depends on ruby1.8
irb depends on irb1.8
sic the 1.8.4 versions will be installed and you will not have to symlink irb.

You just have to turn a blind eye to the metapackage version number.

On 20/06/06, Pau Garcia i Quiles <pgquiles@elpauer.org> wrote:
> On Tuesday 20 June 2006 13:00, Jon Lim wrote:
>
> No, that will install ruby 1.8.2:
>
> pgquiles@enigma:~$ apt-cache show irb | grep Version
> Version: 1.8.2-1
> pgquiles@enigma:~$ apt-cache show ruby | grep Version
> Version: 1.8.2-1
>
> You need the *1.8 packages:
>
> pgquiles@enigma:~$ apt-cache show ruby1.8 | grep Version
> Version: 1.8.4-1ubuntu1
> pgquiles@enigma:~$ apt-cache show irb1.8 | grep Version
> Version: 1.8.4-1ubuntu1
>
> > IIRC that is was just poor naming on the meta packages.
> > Dapper does ship with ruby 1.8.4
> >
> > $ sudo apt-get install irb ruby
> >
> > will install the 1.8.4 versions
> >
> > On 20/06/06, Pau Garcia i Quiles <pgquiles@elpauer.org> wrote:
> > > On Tuesday 20 June 2006 08:48, Minkoo Seo wrote:
> > > > Hi.
> > > >
> > > > I've installed Ubuntu Dapper in my desktop. To my disappoint it doesn't
> > > > have ruby preinstalled. That's still okay, because I can do it by
> > > > myself.
> > > >
> > > > I've apt-get install ruby. Then, I've apt-get install irb1.8 because
> > > > I've installed
> > > > ruby1.8. Surprisingly, irb command did not work. It turned out that I
> > > > also have to apt-get install irb to run irb command.
> > > >
> > > > I can't figure out why things are working in this way. Does it make
> > > > sense to apt-get twice just for irb? Or is this my own problem and not
> > > > of ubuntu packages?
> > > >
> > > > If it's true that we have to apt-get install irb irb1.8 just for irb
> > > > command,
> > > > is there any way to fix such a non-intuitive installation procedure?
> > > >
> > > > Sincerely,
> > > > Minkoo Seo
> > >
> > > Actually, you got it completely wrong. Explanation and fix follows.
> > >
> > > If you run 'apt-cache show irb' and 'apt-cache show irb1.8' you'll see
> > > Ubuntu Dapper ships with two different Ruby versions: packages ruby, irb,
> > > ri, rdoc, etc are Ruby 1.8.2 and packages ruby1.8, irb1.8, ri1.8,
> > > rdoc1.8, etc are Ruby 1.8.4. I guess the reason to ship two different
> > > versions is some dependency problem, but I think that was a very wrong
> > > decision.
> > >
> > > Therefore, you now have two different irb versions installed: 1.8.2 and
> > > 1.8.4 and I'm pretty sure you don't want that. I guess you want Ruby
> > > 1.8.4. What do you do?
> > > 1. First of all, remove the 1.8.2 versions (irb, ri, ruby, rdoc, etc).
> > > You may want to use dpkg --print-avail <packagename> to find out the
> > > version information for an already-installed package. You may want to use
> > > dpkg --get-selections to get a full list of packages installed on your
> > > computer.
> > >
> > > 2. Install the 1.8.4 versions (ruby1.8, irb1.8, rdoc1.8, etc). Now you'll
> > > have /usr/bin/ruby1.8, /usr/bin/irb1.8, etc
> > >
> > > 3. Use update-alternatives to install symlinks for easy access:
> > >
> > >    # update-alternatives --install /usr/bin/irb irb /usr/bin/irb1.8 10
> > >
> > >    This is a per-system (not per-user) setting. You might want to take a
> > > look at man update-alternatives to know the meaning of each option and
> > > how to reconfigure it later.
> > >
> > >   You can just create symlinks instead of using update-alternatives, but
> > > update-alternatives has some advantages (easy management, automanagement
> > > when you install a package that provides the the "alternative", etc).
> > >
> > > Debian Testing and Debian Sid have both Ruby 1.8.2 and Ruby 1.8.4, too.
> > >
> > > Lastly, some people have said it's impossible to install rails in Ubuntu.
> > > That's not true. There is a 'rails' package, it's up-to-date (1.1.2) and
> > > it's in the 'universe' repository. You may need to edit your
> > > /etc/apt/sources.list file.
> > >
> > > --
> > > Pau Garcia i Quiles
> > > http://www.elpauer.org
> > > (Due to the amount of work, I usually need 10 days to answer)
>
> --
> Pau Garcia i Quiles
> http://www.elpauer.org
> (Due to the amount of work, I usually need 10 days to answer)
>
>
>


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