On Mon, Jun 13, 2011 at 09:49, Darren Chamberlain <dar...@boston.com> wrote:
> * Sans <r.santanu.das at gmail.com> [2011/06/13 02:21]:
>
>> Any suggestion from anyone else? Is there a way to check "if a
>> directory (or file) already exists, then do something" in Puppet?
>> Cheers!!
This isn't a suggestion you will like, but: if it hurts when you do
that, don't do it™.
That sort of conditional action is the opposite of how Puppet is
designed to work. You can hack around it with custom facts, but you
are going to fight with the tool the whole time.
The "right" way to do this is that you include a class on all the
machines that *should* have that configuration directory, and file,
present. Inside the class, create the directory, put the config file
in place, and go from there. Puppet talks about the *desired* state
of the system, not the set of actions to take based on the current
state.
> I use this pattern:
>
> $_exists = inline_template("<%= File.exists?('$f') %>")
So, er, templates (including inline_template) run on the *master*
machine. Your example will test if the file exists on the master for
every client catalog compiled – so, in almost all cases, won't work.
The catalog is *static* when it hits the client.
You really need to use a custom fact to do this: only facts contain
information and context about the client machine you are compiling
for, not anything you evaluate on the server, templates included.
> I probably use it too much, in fact, but writing a custom fact for
> every file I need to check becomes tedious and hard to maintain (we
> do this in quite a few places).
It does have the advantage that it would work, though, where this
pattern totally *can't*. :)
Regards,
Daniel
--
⎋ Puppet Labs Developer – http://puppetlabs.com
✉ Daniel Pittman <dan...@puppetlabs.com>
✆ Contact me via gtalk, email, or phone: +1 (877) 575-9775
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