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

Question

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.