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How to collect just strings into array from different classes?

asked 2016-09-27 10:11:46 -0500

Envek gravatar image

Is there any method to collect just array of strings to use it somehow. Just like concat module but for just strings?

I want to do something like this:

# declare string in manifests/one.pp, manifests/two.pp 
# and then:
postgresql::server::config_entry { 'shared_preload_libraries':
  value => join(<| THESE_STRINGS |>, ',')


Is it possible?

Target puppet version: 3.8

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answered 2016-09-28 12:58:01 -0500

Marek Maksimczyk gravatar image

I'm not sure what you want to accomplish but for me looks like you want to use hiera ;). It's good practice to separate data and puppet code. Do you consider this solution?

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I want to construct some comma-separated string based on what classes are in my catalog (which I include in `site.pp`) and then pass it to another resource as parameter, see my own answer to this question for details how I've handled it (I still not fully satisfied with this solution though).

Envek gravatar imageEnvek ( 2016-09-30 06:45:17 -0500 )edit

answered 2016-09-28 11:24:45 -0500

Envek gravatar image

updated 2016-09-28 11:34:50 -0500

Thanks to @DarylW suggestion, I found a module which is for files again, but from its sources I've stolen some helpful snippets and based on them solved my problem (but still unsure, can it be solved better).

So, somewhere in my module I define next two types: one for collecting parts and another to collect and concatenate them into single value.

define smp::db::composable_config_entry_part($target, $content = '') {}

define smp::db::composable_config_entry () {
  Smp::Db::Composable_config_entry_part <| target == $name |> ->
  postgresql::server::config_entry { $name:
    value => inline_template("<%= { |r| r.type == 'Smp::Db::Composable_config_entry_part' && r['target'] == @name }.map { |r| r['content'] }.join(', ') -%>"),

Then I can use smp::db::composable_config_entry_part multiple times in multiple manifests:

# manifests/db/pglogical.pp
smp::db::composable_config_entry_part { 'Add pglogical to shared_preload_libraries':
  target  => 'shared_preload_libraries',
  content => 'pglogical',
  require => Package["postgresql-${smp::db::params::postgres_version}-pglogical"],

# manifests/db/pg_pathman.pp
smp::db::composable_config_entry_part { 'Add pg_pathman to shared_preload_libraries':
  target  => 'shared_preload_libraries',
  content => 'pg_pathman',
  require => Exec["build pg_pathman from sources"],

Then in some main manifest I'm adding this config entry:

# manifests/db/setup.pp
smp::db::composable_config_entry { 'shared_preload_libraries':

And voilá!

$ sudo puppet agent --test
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Info: Caching catalog for smp-dev-db
Info: Applying configuration version '1475078821'
Notice: /Stage[main]/Smp::Db::Setup/Smp::Db::Composable_config_entry[shared_preload_libraries]/Postgresql::Server::Config_entry[shared_preload_libraries]/Postgresql_conf[shared_preload_libraries]/value: value changed '' to 'pg_pathman, pglogical'
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answered 2016-09-27 14:28:30 -0500

DarylW gravatar image

I haven't used it myself, but I have heard of the module datacat..

From it's readme

Puppet types for concatenating data via a template The datacat and datacat_fragment types allow you to build up a data structure which is rendered using a template. This is similar to some of the common concatenation patterns though the intent should be clearer as it pushes the boilerplate down into the type.

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Thank you for help, but it for files too. But I'm started one more googling round from it and found some useful snippets.

Envek gravatar imageEnvek ( 2016-09-28 11:14:34 -0500 )edit

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Asked: 2016-09-27 10:11:46 -0500

Seen: 41 times

Last updated: Sep 28 '16