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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