Puppet users - Jul 2012 - Conditionals within a class based of something else than facter variable

Hi All,

First I want to apologize, I never completely dove into the fine details of 
puppet. I just use it on my network of +-100 VMs for odd jobs.

my question is: I know how to set up a class that would, for example, 
install a package on a machine based on a facter variable (e.g. operating 
system version). 
within the curly braces I can even put a list of operation that would all 
not be run if the machine in question does not conform to the specific 
variable.

I am looking for a way to do something similar using something like if a 
file on the host exists (similar to the ''onlyif'' that is
available in the
exec type).

my dream is:

class foo{
               onlyif "test[ condition ]" {
                                     file{.....}
                                     exec{.......}
               }
}

I hope the question was clear enough, 
Thanks,
Itamar

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On Tuesday, July 3, 2012 at 5:31 AM, Itamar Landsman
wrote:
> Hi All,
>  
> First I want to apologize, I never completely dove into the fine details of
puppet. I just use it on my network of +-100 VMs for odd jobs.
>  
> my question is: I know how to set up a class that would, for example,
install a package on a machine based on a facter variable (e.g. operating system
version).
> within the curly braces I can even put a list of operation that would all
not be run if the machine in question does not conform to the specific variable.
>  
> I am looking for a way to do something similar using something like if a
file on the host exists (similar to the ''onlyif'' that is
available in the exec type).
>  
> my dream is:
>  
> class foo{
>                onlyif "test[ condition ]" {
>                                      file{.....}
>                                      exec{.......}
>                }
> }
Itamar,

You should take a look at the Puppet Language Guide
(http://docs.puppetlabs.com/guides/language_guide.html) - and in general the
rest of the docs site, in particular Learning Puppet, which might help you with
some of the fundamentals.

There are a number of ways to express what you are attempting to do, but you
nearly have it.  If you have a fact "myfile_present" for which the
value is true, for instance, you can do the following:

class foo {
  if $::myfile_present == true {
    file { … }
    exec { … }
  }
}

In the above mentioned Language Guide, check out the section on Conditionals.

-Eric

--  

Eric Shamow
Professional Services
http://puppetlabs.com/
(c)631.871.6441

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