Issue #11331 has been updated by eric sorenson.

Priority changed from High to Immediate


----------------------------------------
Feature #11331: Add 'foreach' structure in manifests
https://projects.puppetlabs.com/issues/11331#change-82529

Author: Steve Shipway
Status: Needs Decision
Priority: Immediate
Assignee: J.D. Welch
Category: language
Target version: 3.x
Affected Puppet version: 
Keywords: ux backlog
Branch: https://github.com/puppetlabs/puppet/pull/1420


I doubt this would be simple to do, but it would be very useful to be able to 
do something like this:

    $variable = [ 'a', 'b', 'c' ]
    foreach $loop $variable {
      file { "/tmp/$loop": content=>"I am file $loop"; }
    }

While it is already possible to use an array as a namevar to get something 
similar, it doesnt allow you to have calculated parameters as well.

This would not be expected to break the declarative nature of puppet, though it 
would bring in a new variable scope in the loop.

Using a define with an array for the namevar would work provided the top level 
could not be called multiple times.

We want to have something like this:

    define firewall($users,$port) {
      iptables::open { $users: port=>$port; }
    }
    node foo {
      $webusers = [ 'fred', 'sid' ]
      $sshusers = [ 'fred', 'joe' ]
      firewall { port80: users=>$webusers, port=>80; }
      firewall { port22: users=>$sshusers, port=>22; }
    }

This example would fail because the iptables::open define is called with user 
'fred' two times (although with a different port parameter).  If we could 
instead have a foreach iteration then something like this would be useable:

    define firewall($users,$port) {
      foreach $users {
        iptables::open { "$loop:$port": user=>$loop, port=>$port; }
      }
    }

This would ensure a unique namevar for iptables::open.  We would also be able 
to do things like initialise an array of users with different metadata 
parameters (eg, their full names pulled form LDAP)



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