Puppet users - Jul 2008 - Execute some steps if a file isn't present

Hi all,

I''ve come quite far with my puppet setup, but a few times I got this
problem:

I want to execute a few things if a file isn''t present on the puppet
client.

For example: I want puppet to check if the mod_passenger apache module
exists. If not: installl passenger from gem. Execute the installer,
copy the config file and enable the module with a2enmod.

What would be the right/appropriate way to do this? At this moment I
don''t have a clue.

Thanks!
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LeonB wrote:
> Hi all,
> 
> I''ve come quite far with my puppet setup, but a few times I got
this
> problem:
> 
> I want to execute a few things if a file isn''t present on the
puppet
> client.
> 
> For example: I want puppet to check if the mod_passenger apache module
> exists. If not: installl passenger from gem. Execute the installer,
> copy the config file and enable the module with a2enmod.
> 
> What would be the right/appropriate way to do this? At this moment I
> don''t have a clue.
dunno about a2enmod since i don''t run apache on debian, but:

exec { "whatever":
   command => "/usr/bin/fred barney",
   unless => "/bin/test -f /path/to/touchfile",
   ...
}

that will execute "/usr/bin/fred barney" unless /path/to/touchfile 
exists and is a file

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Hi
>> I''ve come quite far with my puppet setup, but a few times I
got this
>> problem:
>>
>> I want to execute a few things if a file isn''t present on the
puppet
>> client.
>>
>> For example: I want puppet to check if the mod_passenger apache module
>> exists. If not: installl passenger from gem. Execute the installer,
>> copy the config file and enable the module with a2enmod.
>>
>> What would be the right/appropriate way to do this? At this moment I
>> don''t have a clue.
> 
> dunno about a2enmod since i don''t run apache on debian, but:
> 
> exec { "whatever":
>    command => "/usr/bin/fred barney",
>    unless => "/bin/test -f /path/to/touchfile",
>    ...
> }
> 
> that will execute "/usr/bin/fred barney" unless
/path/to/touchfile
> exists and is a file

how about the creates param of the exec type?

however often if you have to do something hackish like this, you often
have the wrong approach to solve your problem.

greets pete

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Thanks Peter,

I already thought I was walking the wrong path. But I didn''t know of
any other :)

Wat does the "creates" param do exactly?

Thanks!

On Jul 14, 11:02 pm, Peter Meier <peter.me...@immerda.ch>
wrote:
> Hi
>
>
>
> >> I''ve come quite far with my puppet setup, but a few times
I got this
> >> problem:
>
> >> I want to execute a few things if a file isn''t present on
the puppet
> >> client.
>
> >> For example: I want puppet to check if the mod_passenger apache
module
> >> exists. If not: installl passenger from gem. Execute the
installer,
> >> copy the config file and enable the module with a2enmod.
>
> >> What would be the right/appropriate way to do this? At this moment
I
> >> don''t have a clue.
>
> > dunno about a2enmod since i don''t run apache on debian, but:
>
> > exec { "whatever":
> >    command => "/usr/bin/fred barney",
> >    unless => "/bin/test -f /path/to/touchfile",
> >    ...
> > }
>
> > that will execute "/usr/bin/fred barney" unless
/path/to/touchfile
> > exists and is a file
>
> how about the creates param of the exec type?
>
> however often if you have to do something hackish like this, you often
> have the wrong approach to solve your problem.
>
> greets pete
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Looked it up: A file that this command creates. If this parameter is
provided, then the command will only be run if the specified file does
not exist.

I think that would be very helpful. Thanks again!

On Jul 14, 11:02 pm, Peter Meier <peter.me...@immerda.ch>
wrote:
> Hi
>
>
>
> >> I''ve come quite far with my puppet setup, but a few times
I got this
> >> problem:
>
> >> I want to execute a few things if a file isn''t present on
the puppet
> >> client.
>
> >> For example: I want puppet to check if the mod_passenger apache
module
> >> exists. If not: installl passenger from gem. Execute the
installer,
> >> copy the config file and enable the module with a2enmod.
>
> >> What would be the right/appropriate way to do this? At this moment
I
> >> don''t have a clue.
>
> > dunno about a2enmod since i don''t run apache on debian, but:
>
> > exec { "whatever":
> >    command => "/usr/bin/fred barney",
> >    unless => "/bin/test -f /path/to/touchfile",
> >    ...
> > }
>
> > that will execute "/usr/bin/fred barney" unless
/path/to/touchfile
> > exists and is a file
>
> how about the creates param of the exec type?
>
> however often if you have to do something hackish like this, you often
> have the wrong approach to solve your problem.
>
> greets pete
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