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Perl

Revision as of 22:33, 11 April 2010

The Perl environment on the Maemo Platform

Because Maemo is based on debian, and because perl is such a big part of the debian OS, Maemo contains a full-blown Perl platform. This page aims to document and describe this environment so developers can take advantage of it when programming on the Maemo platform.

Fremantle

The current version of perl shipped with the N900 is 5.8.3.

One caveat of perl development on the N900 is that there is a fuller perl distribution in the SDK than on the device. This means not just that there are fewer modules on the device, it means that rather fundamental perl modules are missing form the normal debian version of perl on the device. This is done to save space; the device itself is embedded linux, the root files system is rather small, i.e. 228 Megs.

You will find it difficult to build perl modules on the device if you do not add the necessary perl tools, namely perl and perl-modules. Without these key tools, many of the modules used to build perl modules won't exist on the device and you won't be able to add software written in perl. Here is an example of what is shipped with both the SDK and device environments;

The SDK repositories are here:

deb http://repository.maemo.org fremantle/sdk free non-free
deb http://repository.maemo.org fremantle/tools free non-free

If you wish to add perl modules what I recommend is to bring in the necessary tools, namely the perl package and the perl-modules package. You can do that by adding the repositories that supply modules to the SDK. Of course you can build perl yourself, but it is already built for the device's architecture and it is in a known good state, so it is much easier to just take the already built perl binaries for the N900. (There are later versions of perl built and packaged for the device, I'll eventually provide links to those, until then, you'll have to rely on google.)

Once you have added the SDK repositories to your /etc/apt/sources.list, simply run apt-get update and apt-get install perl perl-modules.

Now you should be ready to start bringing other modules in.

Git repo at Gitorious

I have packaged one module so far, I hope to bring in many more perl modules. If you package something for the device, why not contribute your module to the maemo repos and/or ask me to pull it into the gitorious repo that I have set up?

dh-make-perl at garage.maemo.org

Just ported dh-make-perl for Maemo fremantle. The packages ported are available at [1]. It includes among

Some notes for people who want to port perl modules for ARM. I found out that I had to change the following (change your proxy settings as appropiate):

# Environment vars
SBOX_REDIRECT_IGNORE=/usr/bin/perl
export  SBOX_REDIRECT_IGNORE
unset PERL5LIB
export PATH=/usr/bin/dh7:/usr/bin:$PATH
export DISPLAY=:2
export http_proxy=http://172.16.0.1:3128
export https_proxy=http://172.16.0.1:3128
export ftp_proxy=http://172.16.0.1:3128
export GIT_SSL_NO_VERIFY=1
echo "127.0.0.1 localhost" > /etc/hosts

Nasty script to substitute /usr/bin/man which breaks dh_installdocs

#!/bin/bash
n=$#
echo "$# $1 $2 $n"
while [ $n -ne 1 ]; do
 echo "$# $1 $2 $n"
 p=$1
 shift
 n=$#
done
p=$1
echo $p
/usr/lib/man-db/manconv -f UTF-8:ISO-8859-1 -t UTF-8//IGNORE  $p