Puppet users - Sep 2011 - Foreach loop?

Hi all,

One of my facter variables returns an array of disks presently connected 
to the system. I want to have something in my manifest that loops around 
the array and adds a Nagios check for each disk.

In perlish pseudocode, I imagine something like this:

@disks = sda,sdb,sdc

foreach $disk in @disks {
         @@nagios_service { "check_disk_${disk}":
                 check_command => "check_disk!${disk}",
                 host_name => "$fqdn",
                 service_description => "Disk ${disk} status",
         }
}

 From what I can gather, a straightforward foreach isn''t possible in 
puppet 2.6.6. Is there a workaround or a better way of achieving this?

Thanks,
Jonathan

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----- Original Message -----
> Hi all,
> 
> One of my facter variables returns an array of disks presently
> connected
> to the system. I want to have something in my manifest that loops
> around
> the array and adds a Nagios check for each disk.
> 
> In perlish pseudocode, I imagine something like this:
> 
> @disks = sda,sdb,sdc
> 
> foreach $disk in @disks {
>          @@nagios_service { "check_disk_${disk}":
>                  check_command => "check_disk!${disk}",
>                  host_name => "$fqdn",
>                  service_description => "Disk ${disk} status",
>          }
> }
> 
>  From what I can gather, a straightforward foreach isn''t possible
in
> puppet 2.6.6. Is there a workaround or a better way of achieving
> this?
If you made a defined type you can do it.

here''s a very simple one that loops an array and create
''notify'' resources:

define print {
   notify{"the message is: ${name}": }
}

print{["one", "two", "three"]: }

this would be the same as making these resources by hand:

notify{"the message is: one": }
notify{"the message is: two": }
notify{"the message is: three": }

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R.I.Pienaar:
> here''s a very simple one that loops an array and create
''notify''
> resources:
> define print { notify{"the message is: ${name}": } }
> print{["one", "two", "three"]: }
Strictly speaking, this isn''t really "looping" on the array
so much as
"mapping" on the array (there may be a more specific term out there in
FP-land).  There ought to be no guarantee of the order in which these
notifies are realized, and the only promised result should be that each
element will be realized exactly once before the operation on the array
has completed.

Nit-picky, I know, but it''s important to avoid procedural language when
discussing a declarative system.

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