Thank you Dan and Henrik for taking the time to help.
Henrik, your solution is what I am using in concert with common.yaml to add
a default to the base_dir value.
Mahalo!
-Jody
On Sun, Oct 7, 2018 at 5:35 AM Henrik Lindberg <henrik.lindb...@puppet.com>
wrote:
> If you are on a reasonably modern Puppet version you should do it like
> this:
>
> class myclass(
> String $base_dir,
> Optional[String] $conf_dir = "${base_dir}/conf"
> ) {
> }
>
> I tested it as well:
>
> class myclass(
> String $base_dir,
> Optional[String] $conf_dir = "${base_dir}/conf"
> ) {
> notice "base_dir = ${base_dir}, conf_dir = ${conf_dir}"
> }
> class { myclass: base_dir => 'yay' }
>
> With the result:
>
> Notice: Scope(Class[Myclass]): base_dir = yay, conf_dir = yay/conf
>
> And when executed like this:
>
> class myclass(
> String $base_dir,
> Optional[String] $conf_dir = "${base_dir}/conf"
> ) {
> notice "base_dir = ${base_dir}, conf_dir = ${conf_dir}"
> }
> class { myclass: base_dir => 'yay', conf_dir => 'not yay' }
>
> The result is:
>
> Notice: Scope(Class[Myclass]): base_dir = yay, conf_dir = not_yay
>
> Which I think is what you wanted.
>
> If the logic you need for coming up with a default value is complex, it
> can be written as a function to which you present the input as
> arguments. The above could have been written:
>
> function mymodule::conf_default(String $base) { "${base}/conf" }
> class myclass(
> String $base_dir,
> Optional[String] $conf_dir = mymodule::conf_default($base_dir)
> ) {
> }
>
> Which for the case you showed is total overkill, but good to know if
> you need something more complex in another place in your code.
>
> Hope this helps.
> Best,
> - henrik
>
>
>
> > On 2018-10-06 18:15, 'Dan White' via Puppet Users wrote: > You need to
> do like this:
> >
> > class myClass (
> > String $base_dir,
> > Optional[String] $conf_dir,
> > ) {
> > if $myClass::conf_dir == undef {
> > $myClass::actual_conf_dir = "$myClass::base_dir/conf”
> > } else {
> > $myClass::actual_conf_dir = $myClass::conf_dir
> > }
> >
> > … and then use $myClass::actual_conf_dir in the template
> > }
> >
> >> On Oct 3, 2018, at 12:41 PM, Jody Des Roches <dbm...@gmail.com> wrote:
> >>
> >> I'd like to set default values for parameters that will be passed to
> epp templates. However, the default value is based on another parameter.
> I understand that variables are immutable but this is a parameter that
> shouldn't be touched unless it wasn't set.
> >>
> >> Here is an example construct with a few of my syntax attempts.
> >>
> >> class myClass (
> >> String $base_dir,
> >> Optional[String] $conf_dir,
> >> ) {
> >> #Attempt 1: Failed
> >> if $myClass::conf_dir == undef { $myClass::conf_dir =
> "$myClass::base_dir/conf" }
> >>
> >> #Attempt 2: Failed
> >> if !$myClass::conf_dir { $myClass::conf_dir = "$myClass::base_dir/conf"
> }
> >>
> >> #Attempt 3: Failed
> >> unless $myClass::conf_dir { $myClass::conf_dir =
> "$myClass::base_dir/conf" }
> >> }
> >>
> >> --
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>
>
> --
>
> Visit my Blog "Puppet on the Edge"
> http://puppet-on-the-edge.blogspot.se/
>
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