Issue #3537 has been updated by Kjetil Torgrim Homme.

Status changed from Rejected to Re-opened

As far as I understand it, that would state the relationship in the wrong 
direction.  There can be many "main" (e.g., via a define), but only one 
"prereq".  With subscribe, the instances of "main" have to be listed explicitly 
in the "prereq".  In addition, "prereq" would run *after* the "main"(s), which 
is kind of a showstopper, too :-)
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Feature #3537: It should be possible to trigger (exec) resources with require
http://projects.puppetlabs.com/issues/3537

Author: Kjetil Torgrim Homme
Status: Re-opened
Priority: Normal
Assigned to: 
Category: 
Target version: 
Affected version: 0.25.4
Keywords: 
Branch: 


When an Exec has conditions associated with it (unless, creates, onlyif), it 
can be useful to be state prerequisites which are only run when the exec itself 
is run.

Consider this simple example::

  exec { "prereq":
      command => "/bin/echo prereq",
      refreshonly => true
 }
  
  exec { "main":
      command => "/bin/echo main",
      onlyif  => "/bin/grep foobar /etc/issue",
      require => Exec["prereq"]
 }

Here, the refreshonly will cause "prereq" to never run, since a require isn't 
enough to trigger it.  Without refreshonly, it will run every time, but the 
desired behaviour is that "prereq" is run iff the onlyif command succeeds.

Obviously the behaviour of "refreshonly => true" can't change, and I can't 
think of a good name for a tri-state alternative -- "refreshonly => 
'requires-too'" ?  "allevents" may be more workable.

My prefered solution would be a new parameter "requireonly".  Perhaps slightly 
misleading name, since "before" should trigger execution, too, but I think most 
people will understand that require/before are inherently intertwined.  This 
could later be generalised into a metaparameter to work for more types, e.g. 
you could have a parent File which is only checked/updated/created when some 
other File requires it.



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