dimitris kalamaras

Easy. Short of.

I did this ‘experiment’ to test how much cross-platform Qt really is. I wanted to see if SocNetV can run on Maemo with no modifications whatsoever. These are the steps I followed:

1. Downloaded and installed the Xephyr X11 server (this is a small X11 server that runs inside ‘normal’ X and provides a virtual device screen where you see all the Maemo applications running):

sudo apt-get install xserver-xephyr

2. Downloaded and installed  Scratchbox and  Maemo SDK  in my laptop (Kubuntu x86/lucid).  I followed the straightforward instructions from the Maemo wiki and especially “Installing Maemo 5 SDK on x86-32 Debian based distribution“. It’s only seven steps and circa 100MBs of total downloads…

(more…)

Filed under:
C++, Open Source, Qt, SNA by dimitris

Simple. At least in Debian, Kubuntu and other Debian-derivatives. Install Samba server and the appropriate KDE4 module as root:

# apt-get install samba kdenetwork-filesharing

The kdenetwork-filesharing package installs a nice System Settings panel to configure network file-sharing using NFS and Samba. It also adds (the initially missing) functionality in the Properties > Share tab of each file and folder in Dolphin.

So, install the above packages, then open Dolphin, select a folder, right-click on it and select Properties then go to Share tab. Click on Configure File Sharing button and a new dialog appears. Let the “Simple Sharing” option intact and click on the Add button. A new dialog appears where you select and add the desired folder. Click OK twice. You are done.

Filed under:
Linux, Open Source by dimitris

Just use the fabulous command REPLACE provided by mysql. The syntax goes like this:

update database_table set table_column = replace (table_column, "oldstring", "newstring");

For instance, to replace all occurrences of “modules” inside the linuxformat.gr drupal db with “sites/all/modules” I typed in:

update linuxformat_system set filename = replace (filename, "modules", "sites/all/modules");

Filed under:
Open Source, Web development by dimitris

Name-based virtual hosting enables us to serve different domains from a single server. All we need is to add this line to /etc/apache2/sites-available/default:

NameVirtualHost *

The * specifies that Apache will serve requests for all IP addresses; optionally we can specify only a certain IP on the server.

Next, we create a new for each different domain we want to serve.

This can be done either by adding a few lines inside /etc/apache2/sites-available/default

<VirtualHost *>
    ServerName www.lxf.gr
    ServerAlias lxf.org
    DocumentRoot /media/oxy/www/lxf
</VirtualHost>

or by creating a new file (i.e. lxf.gr) inside /etc/apache2/sites-available

<VirtualHost *>
 ServerAdmin dkalamaras@onemail.com
 ServerName lxf.gr
 ServerAlias lxf.gr
 DocumentRoot /media/oxy/www/lxf
 <Directory /media/oxy/www/lxf>
  Options Indexes FollowSymLinks
  Options -MultiViews
  AllowOverride All
  Order allow,deny
  Allow from all
 </Directory>
 CustomLog /var/log/apache2/lxf-access.log combined
 ServerSignature On
</VirtualHost>

and symlinking it to /etc/apache2/sites-enabled:

sudo ln -s /etc/apache2/sites-available/lxf  /etc/apache2/sites-enabled/

Technorati Tags: apache, linux

Filed under:
Linux by dimitris

That is the lesson I have learned today.

Despite my eagerness to update my N900 to Maemo 5 v10.2010, the software update tool kept giving me the following cryptic message:

“not enough memory in target location“

Wtf? The message was a surprise for me, since I thought the 32GB of my N900 would be more than enough for an 113.1MB update. But…Rootfs partition in n900 amounts only to 227MB, which apparently was nearly consumed by all the silly tools I have installed recently (mc, gnu-tar, openssh, lighttpd (yep, I run a web server on my mobile phone!), numpty-physics, bouncy, scummvm etc), along with ovi maps, micro-blogging app, etc.

After a while searching the Internet, I ended up in the maemo.org excellent wiki which of course was giving some usual-space-saving linux tips:

apt-get clean
apt-get autoremove

along with some more unusual (to me!) ‘opt-ifications’.

What’s that? The maemo slang for “move whatever can be moved from /usr to /home/opt”. For instance, you can easily mv nokia-maps from /usr/share to /home/opt and then ln -s back to where it was, so that the relevant application could run. Using this technique I managed to free almost 60MB in rootfs.

Now the update is underway and I am eager to see what’s new.

Filed under:
Hardware, Linux, Open Source by dimitris