Run `apt-get update` before installing other packages with Puppet

Since Puppet 2.6.0 a new feature "relationship syntax" was introduced.

An example in Puppet 2.6.0 and above would look like this:

exec { "apt-update":
    command => "/usr/bin/apt-get update"
}

Exec["apt-update"] -> Package <| |>

Every time a package command is executed, the dependency (in our case 'apt-update') will be triggered fist. You can even define longer chains.

You need to specify the dependency relationships. The easiest/cleanest approach is to use the require parameter which is available for all resource types.

package { "zend-server-ce-php-5.2":
  ensure  => latest,
  require  => Exec['apt-get update'],
}

etc..