On Wednesday, February 26, 2014 3:56:52 AM UTC-6, Richard Fussenegger wrote:
>
> Right now my init.pp contains the following code block:
>
> package { [ 'package-1', 'package-2', '...' ]:
> ensure => 'present',
> require => *Exec*['apt_update'],
> }
>
> This works great — no problem there — but I'd love to use a single init.ppfor
> production and development and control the behavior of everything via
> my Hiera files. This would also allow me to exchange some packages
> depending on the operating system without writing modules for simple
> package installations. I tried a few things and searched for answers;
> without luck.
>
> Maybe you guys have an idea on how to solve this.
>
>
There is a variety of ways to work the details, but most boil down to this
basic paradigm:
data:
my_module::packages:
- 'package-1'
- 'package-2'
...
class:
class my_module {
$packages = hiera('my_module::packages')
package { $packages:
ensure => 'present',
require => Exec['apt_update']
}
}
Notes:
- The value associated in Hiera with key 'my_module::packages' is an
array.
- The value from Hiera is *not* interpolated into a string in the
Package declaration (so it stays an array).
- You use normal Hiera mechanisms (i.e. your data hierarchy) to assign
the correct array of packages to each node.
- You may find it useful to use the hiera_array() function (and
flatten() the result) instead of the plain hiera() function. Either way
gives you an array, but with hiera_array() you can collect package names
from every level of your hierarchy instead of only from the
highest-priority one that provides any.
Note also that if you need different Package parameters for different
package names, then you need a different approach. Your example does not
exhibit a need for that, but if you should ever discover one then one way
to address it would be with the create_resources() function (combined with
appropriately-structured data).
John
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