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Pass array values in class

asked 2016-12-07 01:14:14 -0600

karthik gravatar image

updated 2016-12-07 15:22:03 -0600

lavaman gravatar image

Hello All,

I am begineer with puppet ,I was instructed to install the below packages using "class" what i have done initially is

$packages = [ 'python-pil','python-django', 'requests']
class web {
  package { $packages:
    ensure => installed,

It hadn't worked then tried with

class python_web_pack {
  package { 'python-pil':
    ensure => installed,
  package {'python-django':
    ensure => installed,
  package {'requests':
    ensure => installed,
    provider => pip,

It was worked.However i have to mention the packages individually to accomplish How to shrink the lines by passing the array values.Please guide me

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Kai Burghardt gravatar imageKai Burghardt ( 2016-12-07 06:01:01 -0600 )edit

2 Answers

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answered 2016-12-07 08:24:39 -0600

scoffland gravatar image

updated 2016-12-07 15:22:37 -0600

lavaman gravatar image

Try this

class pythonweb { 
  $pythonweb_packages = [ 'python-pil', 'python-django', 'requests' ] 
  package { $pythonweb_packages : 
    ensure => installed
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I was going to say this same thing, in the OP's example, the array is out of scope of the class.

DarylW gravatar imageDarylW ( 2016-12-08 13:04:13 -0600 )edit

answered 2016-12-07 08:27:33 -0600

Emerson Prado gravatar image

updated 2016-12-09 04:45:07 -0600

EDIT: seeing your code, the problem becomes clear: the $packages array is declared outside the class, so the class doesn't know about it. In tech jargon: the array is not in the class scope.
Just do as @scoffland said and you'll be fine.

Could you pls post your entire code - the web class and the calling class - along with the error?

Noticed the successful attempt passes a parameter - provider - that the failed one doesn't. If this is a requirement, you have to pass it too.

Also, I had problems trying to install several packages at once when there were dependencies among them. If that's the case, you have to explicit which ones get installed first.

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Scope in puppet doesn't always act how people expect coming from other programming languages. We ran into a similar issue with a define declared inside of a class, and expecting the define to have the variable from the class in scope.. Hint, it isn't, and put your defines in their own files!

DarylW gravatar imageDarylW ( 2016-12-09 08:28:59 -0600 )edit

@DarylW VERY IMPORTANT hint. The same for classes. Each class and each define in its own file, respecting the autoload rules, and we're quite better.

Emerson Prado gravatar imageEmerson Prado ( 2016-12-10 08:25:36 -0600 )edit

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Asked: 2016-12-07 01:14:14 -0600

Seen: 363 times

Last updated: Dec 09 '16