On Feb 17, 9:19 am, "R.I.Pienaar" <r...@devco.net> wrote:
> ----- Original Message -----
> > From: "jimbob palmer" <jimbobpal...@gmail.com>
> > To: puppet-users@googlegroups.com
> > Sent: Friday, February 17, 2012 3:12:46 PM
> > Subject: [Puppet Users] Puppet unless behaviour with a dependency
>
> > Is this really expected behaviour? Should the second Exec succeed
> > even if the first never runs?
>
> > exec { "one":
> > command => "/bin/true",
> > unless => '/bin/false'
> > }
> > exec { "two":
> > command => "/bin/true",
> > require => Exec["one"],
> > }
>
> I think this ishttps://projects.puppetlabs.com/issues/5876
No, I don't think this is 5876. That involves an Exec that 'require's
a *failing* resource, but which runs anyway because it also
'subscribe's to resources that are applied successfully. This case is
quite different: Exec['two'] depends on a resource that *succeeds*,
therefore there is no reason why it should not run.
The key point here is that the 'unless' and 'onlyif' parameters of an
Exec never themselves cause that Exec to fail. Instead, they are
among an Exec's ways of determining whether it is already in sync, and
a resource that is already in sync succeeds trivially. If the Exec is
not already in sync then its command is run, and its success is judged
by the return value.
> i think this is a major failure of Puppet to honour what people expect
> and what the language suggests in the choice of meta param names etc
> but there's some debate in that ticket
I think 5876 is a real problem, but not so much the issue presented
here. People can evidently be taken by surprise, but I rate that a
documentation issue. The behavior itself is sensible and desirable.
Moreover, the alternative is already available by putting the
condition into the command, like so:
exec { 'example': command => '/usr/bin/
fail_when_the_command_shouldnt_run && /usr/bin/the_command' }
As the OP discovered, the alternative can also be achieved via
subscribe / notify.
John
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