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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