Mast Kalandar

bandar's colander of random jamun aur aam

Tue, 04 Mar 2008

Testing testing or breaking toys


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One of questions which is frequently asked by newcomers who use GNU/Linux (especially those from the Windows world) is how do I use the "latesht" software out there.

Sometimes this is necessiated by the hardware being "latesht" as well, but more often then not it is out of a fear of being labelled "obsolete".

Here is one way to use newer software if any of the following applies to you:

  1. You do not have root access.
  2. You do not want your changes to tamper with system files.
  3. You want to ensure that you can recover your system exactly as it was before --- just in case.
  4. You are too busy^Wlazy to compile everything for yourself.
  5. You want software to run at "real" speeds, not slow^Wemulator speeds.

The following conditions apply to the solution presented:

A. The software you want has been packaged for your hardware. B. You are not afraid that this software will damage files owned by you (as user). Alternatively, you do have root access to create a different user to run this software as. C. The software you want to use/test is not something "core" like the "kernel" and does not depend on a new feature of the kernel. D. You are using Debian or a derivative. (Similar solutions are available for Fedora etc. but I haven't worked them out) C. You have enough disk space (at least 1GB or so depending on the size of the package you want).

By hook or by crook, you need to ensure that your system has the following (rather small) packages installed: fakeroot, fakechroot, debootstrap.

In the following, I will assume that the software you want to use is "iceweasel" with the "gcjwebplugin" from the "sid" distribution because that is what I needed!

Step 0: Decide on some locations.

TOP=$HOME/testing2
STATE=$TOP/files.state
ROOT=$TOP/testing
mkdir $TOP

Step 1: Install the system.

PATH=/sbin:/usr/sbin:/bin:/usr/bin; export PATH
fakeroot -s $STATE fakechroot \ 
    debootstrap --variant=fakechroot lenny $ROOT 

Step 2: Perform some fixes inside ROOTmyid=UID

fakeroot -i $STATE -s $STATE fakechroot chroot $ROOT /bin/bash

This will give you a "root" prompt which is not "real".

We first setup to install some packages from sid.

    echo deb http://your.debian.mirror/debian testing main > /etc/apt/sources.list
    echo deb http://your.debian.mirror/debian unstable main >> /etc/apt/sources.list
    echo 'APT::Default-Release "testing";' >> /etc/apt/apt.conf

Install the packages we want.

    apt-get -y install iceweasel gcjwebplugin

Create a user account to use these packages.

    adduser --uid=$myid $LOGNAME

Exit from this prompt

    exit

Back at the original prompt. We need to give X access to the sub-user.

rm $ROOT/tmp/.X11-unix
ln -s /tmp/.X11-unix $ROOT/tmp/
ln -s $HOME/.Xauthority $ROOT/$HOME/

Step 3: Use the program!

fakechroot chroot $ROOT iceweasel

Step 4: Update your software (required as soon as you hear of exploits!)

fakeroot -i $STATE -s $STATE fakechroot chroot $ROOT /bin/bash

    apt-get update
    apt-get upgrade
    exit


Wed, 13 Sep 2006

Editing PDF forms

Sun, 30 Apr 2006

Two computers turned into one one interface

Fri, 17 Jun 2005

Any luck with FreeNX?
Using remote X with VNC

Fri, 08 Apr 2005

System without a "real" file-system

Mon, 17 Jan 2005

A Short course on ALSA.

Thu, 15 Jul 2004

Maximixed terminals and WM wars

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