Issue #3537 has been updated by micah -.
I have an example. Lets say I have an exec, which updates apt:
<pre>
exec {
'refresh_apt':
command => '/usr/bin/apt-get update && sleep 1',
refreshonly => true,
subscribe => [ File['/etc/apt/apt.conf.d'],
Config_file['/etc/apt/sources.list'] ];
</pre>
when I install packages, i want to make sure that my apt information is
up-to-date before I do the install. So how can I trigger this exec *before* a
package resource is realized? I cannot do "Package { require =>
Exec[refresh_apt] }" because 'refreshonly' is only triggered by 'notify' or
'subscribe'. I can't use 'notify' because that will be run after the package
resource has been realized. Subscribing to the exec isn't going to do anything
either.
----------------------------------------
Feature #3537: It should be possible to trigger (exec) resources with require
https://projects.puppetlabs.com/issues/3537
Author: Kjetil Torgrim Homme
Status: Re-opened
Priority: Normal
Assignee:
Category:
Target version:
Affected Puppet 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::
<pre>
exec { "prereq":
command => "/bin/echo prereq",
refreshonly => true
}
exec { "main":
command => "/bin/echo main",
onlyif => "/bin/grep foobar /etc/issue",
require => Exec["prereq"]
}
</pre>
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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