Lowercase variable values in a Puppet template

puppetstrings

In my puppet config I need to lowercase a variable value before using it in a template. How to achieve this? Is there a way to lowercase a variable value inside the puppet manifest? Do I need to do this in the template?

And more general: where are string manipulation functions that I could use in manifests.

Do I have to write my own custom ruby functions to achieve this?

Best Answer

Puppet's string manipulation capabilities inside manifests are very limited. Manifests aren't really intended to handle stuff like this.

But, in the template, it's easy; normal ruby functions are available. Say I wanted a lowercase of the osfamily fact:

<%= osfamily.downcase %>

Related Solutions

Puppet: Checking sets of variables

As @Zoredache mentioned, there is no loop in Puppet. But you can get around this by using a definition, something like this:

define show_ip {
    $inf = "ipaddress_${name}"
    $ip = inline_template('<%= scope.lookupvar(inf) %>')

    if $ip =~ /192\.168\.3.*/ {
        notify {"Found IP $ip": }
    }
}

$ifs = split($interfaces, ',')

show_ip { $ifs: }

Belows is the output when directly calling:

# puppet manifests/defines/net.pp 
warning: Implicit invocation of 'puppet apply' by passing files (or flags) directly
to 'puppet' is deprecated, and will be removed in the 2.8 series.  Please
invoke 'puppet apply' directly in the future.

notice: Found IP 192.168.3.118
notice: /Stage[main]//Show_ip[eth1]/Notify[Found IP 192.168.3.118]/message: defined 'message' as 'Found IP 192.168.3.118'
notice: Finished catalog run in 0.07 seconds

Source: https://blog.kumina.nl/tag/puppet-tips-and-tricks/

Puppet templates and undefined/nil variables

Couldn't you just set a default in the class definition?

class myclass ($a_variable = "a default value") {

Best Answer

Related Solutions

Puppet: Checking sets of variables

Puppet templates and undefined/nil variables

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