Archive for the ‘Tech’ Category

If you want a service to start automatically when Gentoo boots up, you need to tell Gentoo to start it. Gentoo looks at /etc/runlevels/boot to see what it needs to run, so all you need to do is add a symlink in here to your init.d script. In this example, I’ll use exim.

cd /etc/runlevels/boot
ln -s /etc/init.d/exim exim

Next time Gentoo boots, it will see exim in the boot directory and run the script. This isn’t just limited to boot either – /etc/runlevels also has directories for shutdown and system initialisation.

Sometimes, PHP will kick up a fuss complaining about date.timezone not being set. We found this on the Symfony framework and were able to replicate it on standalone scripts.

[Exception]
DateTime::__construct(): It is not safe to rely on the system's timezone settings.
You are required to use the date.timezone setting or the date_default_timezone_set()
function. In case you used any of those methods and you are still getting this
warning, you most likely misspelled the timezone identifier.
We selected 'Europe/Berlin' for 'CEST/2.0/DST' instead

Normally, you would fix this by editing your php.ini file and adding a declaration there.

date.timezone = "Europe/Berlin"

But we had already done this and it still wasn’t working! After some further investigation, it seemed that PHP simply couldn’t access the value.

echo(ini_get("date.timezone"));

This doesn’t make any sense, and we never got to the bottom of what was going on, but there are two ways around the problem. Firstly, you could modify your PHP script so that it makes a call to set the system timezone.

date_default_timezone_set("Europe/Berlin");

However, this involves having to modify your code, which is bad as you don’t want to have to set the timezone manually, especially in a piece of code which could be deployed to servers in different timezones.

A better approach is to set it in the vhosts directive in Apache.

php_value "date.timezone" "Europe/Berlin"

This isn’t the cleanest solution but allowed us to solve an otherwise unexplainable error.

If you are trying to run CruiseControl on Gentoo Linux, you may find that you get an error similar to the following.

line 109: /bin/java: No such file or directory

There is due to the Java path. You can find it using the following command.

whereis java

You can then create a symlink to it.

ln -s /usr/bin/java /bin/java

Try running the command again and it should work.

If you’re using YAML in Ruby and have it installed via RVM, you might get a notice similar to the following.

It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.

You can solve this using the following commands.

rvm pkg install libyaml
rvm reinstall 1.9.3

You may (or even need) to replace 1.9.3 with your exact version number.

If you’re trying to run PHPUnit from the terminal in Mac OSX Lion, you may get an error similar to the following.

File/Iterator/Autoload.php failed to open stream

You can resolve this by running the following commands.

curl http://pear.php.net/go-pear.phar > go-pear.php
sudo php -q go-pear.php

PHPUnit should now run without errors (or at least, without errors in their code 😉 ).

If you are using the Sinatra framework in Ruby, and you want to embed one ERB template in another, you can do this simply by using the ERB template tag like you can in your regular Ruby code.

<%= erb :welcome %>

Replace “welcome” with your template name as you usually do.

Everyone knows that the new Apple Maps are rubbish, and we all want Google Maps back. This is still the case, but there is one area where Apple Maps is actually really good – “turn by turn directions”, aka the sat nav feature. George informs me that this is actually just TomTom, which probably explains it.

I don’t know if I would replace my sat nav with it – it presumably downloads maps on the fly, so what happens if you lose signal on the motorway, and how much cellular data is it using? But for getting around big cities, it looks very useful as I found it a lot better than my actual sat nav, for directions and clarity.

If you’re trying to run Apache Cassandra with the RubyGem, you may encounter an error similar to the following.

thrift_client(0.8.1 not ~> 0.7.0)

You can fix this by editing the RubyGem.

cd /Library/Ruby/Gems/1.8/gems/cassandra-0.12.1/lib/
vim cassandra.rb

Find the line which sets the dependency.

gem 'thrift_client', '~> 0.7.0'

Change it to the following.

gem 'thrift_client', '~> 0.8.0'

Your script should now run without an error.

If you’re tired of Facebook inviting you to lots of events you weren’t actually invited to, using a 12 hour time format and starting your week on a Saturday, never fear, it’s easy to fix.

If you go to Events, then select the cog on the right hand side, then select settings, you are able to fine tune your options.

If you’re running Mac OSX Lion and trying to update your locate db, you may get the following error message.

-bash: updatedb: command not found

You can call updatedb by using its full path instead.

/usr/libexec/locate.updatedb

You could also create a symlink in your bin directory which would then allow you to just call updatedb as normal.