Hello All I have puppet master in 3.8 version. I need part of code for undefined variable. Example: if var is undefined setup some value something like this but is not working.
if $my_parameter == 'undef' {
$my_parameter = 'none'
}
if variable is defined don't change it
if $myparameter == undef { $myparameter = 'none' }
p.s. If I was the manager of whoever wrote this code they would get a talking to.
The pattern that I most commonly see for this type of 'workflow' internal to a module (not across module boundries) is to use _ to prefix a private variable.
class foo (
$mandatory_param,
$optional_param = undef,
){
# either using a selector to set a 'default' value, usually used if I am munging multiple params, or if one potential default value depends on a different param (like paths relative to a base path)
$_optional_param = $optional_param ? {
undef => 'none',
default => $optional_param,
}
}
Or more generally, just use a default. value, and conditionally assign a different parameter to use in a different location that 'requires' undef.
class bar (
$mandatory_param,
# Or just use a default value explicitly
$optional_param = 'none',
){
#...
}
Asked: 2017-03-23 14:28:21 -0600
Seen: 2,587 times
Last updated: Mar 24 '17
PP is not a procedural language. All “variables” have a final value with their first assignment. Also you're comparing against the string 'undef'. You want to check against the literal undef (not surrounded by single quotes).
I made only example what I need.. there is no any way to make condition like this?