Puppet users - Nov 2012 - for i in array do something - iteration irritation

Hi

I am sure that there is some way to iterate an array and do something for 
each in.  It must be a wheel that has been invented (even if in a ruby 
function)?

I have needed to do something like this a few times now and I reckon 
someone clever has already done it :)

Using a normal bash type for loop as an example:

app::thing { ''foo'':
  $config_templates = [''foo.conf'',
''foo.more.conf'']
}

define app::thing(
  $config_templates = '''',
)  {
  if $config_templates != '''' {
    for i_config in $config_templates
    do
      file { "/opt/app/thing/${name}/conf/${i_config}":
        content =>
template("app/${name}/conf_templates/${i_config}.erb"),
      }
    done
  }
}

Is there something in stdlib or forge to iterate an array and do 
something?  

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Apologies

app::thing { ''foo'':
  config_templates = [''foo.conf'',
''foo.more.conf'']
}

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On Wednesday, November 7, 2012 3:15:15 PM UTC-6, earthgecko
wrote:
>
> Hi
>
> I am sure that there is some way to iterate an array and do something for 
> each in.  It must be a wheel that has been invented (even if in a ruby 
> function)?
>
> I have needed to do something like this a few times now and I reckon 
> someone clever has already done it :)
>
> Using a normal bash type for loop as an example:
>
> app::thing { ''foo'':
>   $config_templates = [''foo.conf'',
''foo.more.conf'']
> }
>
> define app::thing(
>   $config_templates = '''',
> )  {
>   if $config_templates != '''' {
>     for i_config in $config_templates
>     do
>       file { "/opt/app/thing/${name}/conf/${i_config}":
>         content =>
template("app/${name}/conf_templates/${i_config}.erb"),
>       }
>     done
>   }
> }
>
> Is there something in stdlib or forge to iterate an array and do something?
>

Puppet DSL cannot express iteration *per se*, but it can compactly express 
a set of resources that differ only in title.  In conjunction with defined 
types, that is usually sufficient for this kind of problem:

define app::thing::conffile ($thingname) {
  file { "/opt/app/thing/${thingname}/conf/${name}":
    content =>
template("app/${thingname}/conf_templates/${name}.erb"),
  }
}

define app::thing ($config_templates = ''NONE'') {
  if $config_templates != ''NONE'' {
    # creates multiple conf files if $config_templates
    # is an array:
    app::thing::conffile( $config_templates:
      thingname => $name
    }
  }
}


If you need more flexibility than that then you may find the built-in 
create_resources() function useful to you.

For the ultimate in flexibility, you can always write your manifest in 
Puppet''s Ruby DSL, which more or less makes it a dynamic 
manifest-generating script instead of an actual manifest.  In any case, it 
lets you use Ruby directly.


John

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Hi John

Thanks, that will solve my immediate requirement.  Trying to keep it as 
puppet DSL and simple as possible.  However, I will check out the 
create_resources() function further.  Thanks for the pointers.

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