I installed the Ubuntu 9.10 Netbook Remix release candidate on my new Dell Mini 10v and the wireless didn’t work out of the box. I think this is because there isn’t an open source driver and Ubuntu doesn’t ship with proprietary drivers installed. Now the 9.10 has been released this problem may have disappeared, but in case anyone else sees this, the way to solve it is to install the proprietary wireless driver (Broadcom STA) yourself.
This is pretty easy using the Ubuntu restricted drivers tools: Ubuntu Menu -> System -> Hardware Drivers (in the 2nd box of applications). Note that you’ll need an Internet connection to actually install this so hopefully you can make use of a wired connection temporarily! When I initially installed this driver there were actually two to choose from but it was the Broadcom STA driver that worked. Now I only see a single option available.
The API for the indicator applet has changed in Karmic and a little internal IBM Python application that I’ve written stopped working. Only a couple of minor changes were needed but trying to track down exactly what these were was not as easy a task as I’d have liked.
Creating the indicator
The class used to represent an indicator appears to have changed from
Indicator so I threw in the following code to try the new one and fallback to the old one:
# Ubuntu 9.10 and above
indicator = indicate.Indicator()
# Ubuntu 9.04
indicator = indicate.IndicatorMessage()
Previously, indicators automatically made the indicator applet draw your attention with a green dot. In Karmic the green dot appears to have been replaced with a change of the envelope colour to black but it is no longer automatic. To make this work you need to set the
Note that they’ve also added a
count property to display how many notifications are from the same source.
Building .deb packages for Python applications
Recently I wanted to build a .deb package for an internal IBM application I was writing so that users could easily install it and also so we could distribute them through some internal repositories. This proved a bit harder than I expected so this is a quick summary of how I ended up doing it. Note that your requirements might be entirely different!
The first thing to do is to create the files required by the packaging process. I discovered that the
dh_make command can create a load of sample files that can be used as part of this process. To do this, create a directory in the format [package-name]-[version] (e.g. my-great-app-1.0) and run
dh_make from within it (I specified ‘s’ for single binary when prompted). This will create a load of sample files in a ‘debian’ subdirectory. Delete any of these you don’t need (which is probably most of them); I kept the following:
- changelog – change history for all versions of the app (keep to the format specified by the Debian Policy Manual)
- compat – no idea why I needed this but things don’t work properly later if I don’t
- control – the details of the package you are creating (see the specification for all configuration options)
- dirs – the list of directories in which your app will install files (e.g. /usr/bin, /usr/share/pyshared/my-great-app, /usr/share/applications)
- README.Debian – the README for your app
- rules – a MakeFile with instructions for how to create the package (for my Python app the important bit here was in the ‘install’ section; here I created a
$(CURDIR)/debian/my-great-app subdirectory and copied all files into it as if it were
/, e.g. binary to
Once I’d created all those files and put them in
my-great-app/packaging/debian and my source in
my-great-app/src I created a simple build script
my-great-app/bin/build. This looked something like the following:
export DEBFULLNAME="Gareth Jones"
sudo rm -rf my-great-app*
mkdir -p my-great-app-$VERSION
cp -u ../src/*.py ../src/*.desktop ../src/*.ico ../packaging/my-great-app my-great-app-$VERSION
tar -czf my-great-app-$VERSION.orig.tar.gz my-great-app-$VERSION/
cp -u ../../packaging/debian/* debian/
This should create you a
my-great-app_1.0-1_all.deb and the
my-great-app_1.0-1.tar.gz files your repository maintainer might want.
A really useful video I found for helping me fill in the contents of the debian control files (and getting me through the whole process) was here. Definitely worth checking out if you need to do this yourself.
On Wednesday we had the pleasure of Richard Hughes joining us at Hursley to talk about PackageKit. I’ve heard of it but never quite bothered finding out any more than the name but having gone to the presentation I’m pretty glad. PackageKit is (yet another) attempt at making software updating/installation easier on Linux. There are many existing tools for this already but PackageKit seems to be particularly interesting because it’s not actually trying to replace anything; it works with and makes use of the existing tools whilst providing some real value on top. Below is a very quick summary of Richard’s presentation.
- Good packaging formats
- Depency solvers, downloaders and UIs bolted on
- Can’t have automatic updates (needs password authentication)
- Can’t use fast-user switching (lock out install applications/databases)
- Errors/warnings in English only and really confusing to average user
- Installation is done by package names not application names (many to many relationships)
- Can power down during update – bit dangerous!
- The ‘glue’
- Integrates with existing tools (including dependency mangement etc)
- Improves authentication (uses PolicyKit – fine grained control)
- System activited daemon (only running when you need it)
- Only need to write simple integration between tools and PackageKit (doesn’t even need to be complete and done for most tools already) plus thin UI
- Uses DBUS (two layers – one for full control, one “just do it”)
- Applications can integrate directly (e.g. install clipart from openoffice)
- Installation/update by application not package (users know what it is they’re installing!)
- Doesn’t allow shutdown during installs
- Easy to contribute (git with anonymous access – merged to release daily)
- Rapid development (roughly one minor release per month)
- Shipped with Fedora 9 (and others)
- Strong interest from OpenMOKO, Ubuntu (and others)
I’ve installed an old-ish release on my Ubuntu machine (straight from the repositories) and it looks pretty good. Definitely gonna pay attention to this project, it looks like a big step in the right direction.
Recently I’ve been putting together a Web application for a research project. I decided it was about time I really looked properly into REST so my Web interfaces are better structured. I won’t go into all the benefits here, you can read for yourself. Suffice to say it seems like a good approach to take.
This is quite a long article and you might only be interested in some of it so here are the sections:
If you have an suggestions for improvement, please let me know – this was a first attempt!
For my BSL level 3 course I have a variety of OpenOffice documents for different forms etc which make up the portfolio. I wanted a way to merge these into a single document but they each had different margins and all sorts; this meant doing it within OpenOffice was proving to be a pain. My solution was to write a quick shell script to convert each document into PDF and then merge the multiple PDFs. The script looks something like the following:
# convert to pdf
unoconv -f pdf myfile1.odt myfile2.odt ...
# merge pdfs
pdftk myfile1.pdf myfile2.pdf ...
# remove individual pdf documents
rm myfile1.pdf myfile2.pdf ...
A handy little hack to generate my entire portfolio.
I received an IBM Thanks! award recently from Darren for helping out with the Feel Good Inc. Extreme Blue project. One of the choices was a ‘Recycled Office Pack’ which sounded interesting and so I thought I’d go for that:
All items say things like ‘made from recycled paper and card’, ‘using sustainable timber’ etc.