Only set OS-specific defaults in Hiera. And never in common.yaml unless the default value should not be documented.

All defaults in hierra == crappy reference.md 😞

thats a very valid point

(default values are only shown when set as default in the puppet code)

class { 'foo':
  some_param => undef,
}

Declaring a class and specifying a parameter’s value as

undef

is effectively the same as not declaring that parameter. The consequence of that is that the parameter’s value will then be looked up via APL, then fall back to the parameter’s default value (if one is defined). So if a parameter has a default value of something, you can’t override that by passing in

undef

at declaration time. Is this the situation you’re in?

class { 'foo':
  some_param => undef,
}

Declaring a class and specifying a parameter’s value as

undef

is effectively the same as not declaring that parameter. The consequence of that is that the parameter’s value will then be looked up via APL, then fall back to the parameter’s default value (if one is defined). So if a parameter has a default value of something, you can’t override that by passing in

undef

at declaration time. Is this the situation you’re in?

yea im trying to use a pick and have the pick fall back on undef.. but even if i remove the pick and just declare the class where i specify that optional param with value of undef it fails with a 500 eval error

parameter 'package_url' expects a value of type Undef or String, got Type[Undef]

err… that error doesn’t make sense. Can you share the actual code that’s declaring the class and what the parameter’s definition is? Did you pass

Undef

or

undef

?

sorry meeting.. but sure so im using Undef so you can reproduce if you do this using the test case you shared above, instead of include, if you use class declaration:

puppet apply --modulepath=. -e "class { 'test':  param1 => Undef,}"
Error: Evaluation Error: Error while evaluating a Resource Statement, Class[Test]: parameter 'param1' expects a value of type Undef or String, got Type[Undef] (line: 1, column: 1) on node

Use

undef

, not

Undef

.

(assuming the param’s definition uses

Optional[String]

)

is class

test

has default value set for param1 ? because it will be used when you are passing

undef

, you can't pass undef to a class

(assuming the param’s definition uses

Optional[String]

)

🤯

undef means - use default value

Right, that ☝️ is the real issue here. Passing an explicit

undef

is the same as not passing the parameter at all, so its defaults will be used instead (APL -> param default).

the whole puppet works like that

Right, that ☝️ is the real issue here. Passing an explicit

undef

is the same as not passing the parameter at all, so its defaults will be used instead (APL -> param default).

Undef == type undef == value...

yup.

Undef

is a type.

undef

is a value that is of type

Undef

.

yup.

Undef

is a type.

undef

is a value that is of type

Undef

.

well thanks so much for clearing that all up for me.. this gives me a better solution to the problem.. just wish pick/pick_default would pass an undef, but ill just define the var as undef conditionally and pass it

What version of Puppet are you on? Modern versions pretty much negate the need for

pick()

6.23.0

for example,

get()

will return

undef

as a default: https://puppet.com/docs/puppet/6/function.html#get

thank you @natemccurdy! I hadnt used that one before, but getvar works nicely for me... getvar('_package_url') passes a undef if the vars is not defined and if it is it passes the url and triggers the appropriate code block 😄

meeting 🧑‍🏫 Bolt is about to start up in #CFD8Z9A4T

one easy, package { 'Binary Tree Active Directory Pro Agent': ensure => installed, source => '/binaries/cloud/windows/BinaryTree/Active-Directory-Pro-Agent-20.1.0.1-Installer.msi', install_options => [ '/passive', { 'INSTALLDIR' => 'C:\binarytree'}] } this if having issue installing the msi, What if can instead of trying to just install it, try to run this from a local path, but how do in download / copy that msi to a local path? anyone with a basic command?

Thanks in advance

If you can put the MSI on a network share, you can refer to it by its UNC path in the

source

attribute.

source => '//some/path/on/a/network/share/installer.msi',