Puppet users - Sep 2011 - How to check if a given "directory" exists??

Dear all,

I have a module like this:

class mom_priv_config{
    file {
        ''config'':
        owner   => ''root'', group   =>
''root'', mode    => ''0644'',
        name    => ''/var/torque/mom_priv/config'',
        content => template(''w_nodes/mom_priv-config.tpl''),
        #notify  => Service[''pbs_mom'']
    }
}

which is working great by its own. But all I want is to carry on with
this *ONLY IF* "/var/torque/mom_priv" directory exists on the client.
If there is no such directory presents, just ignore. How can I do
this? I looked in the net but nothing came out as a solution to me.
Any one can help me with please? Cheers!!

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On Sep 28, 2011, at 9:37 AM, Sans wrote:
> Dear all,
> 
> I have a module like this:
> 
> class mom_priv_config{
>    file {
>        ''config'':
>        owner   => ''root'', group   =>
''root'', mode    => ''0644'',
>        name    => ''/var/torque/mom_priv/config'',
>        content =>
template(''w_nodes/mom_priv-config.tpl''),
>        #notify  => Service[''pbs_mom'']
>    }
> }
> 
> which is working great by its own. But all I want is to carry on with
> this *ONLY IF* "/var/torque/mom_priv" directory exists on the
client.
> If there is no such directory presents, just ignore. How can I do
> this? I looked in the net but nothing came out as a solution to me.
> Any one can help me with please? Cheers!!
> 
> -- 
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> 

I''d create a custom fact that checks for the existence of the mom_priv
directory -- something like this:

# mom_priv_test.rb
if FileTest.directory?("/var/torque/mom_priv")
    Facter.add("mom_priv_test") do
        setcode { true }
    end
end
#

Now you can use this fact to wrap your file resource in an if statement:

class mom_priv_config {
    if $mom_priv_test == ''true'' {
        file { ''/var/torque/mom_priv/config'':
            ensure  => present,
            owner    => ''root'',
            group    => ''root'',
            mode    => ''0644'',
            content =>
template(''w_nodes/mom_priv-config.tpl''),
            #notify  => Service[''pbs_mom''],
        }
    }
}

-- 
Peter M. Bukowinski
Sr. Systems Engineer
Janelia Farm Research Campus, HHMI

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Thanks Peter!
Custom fact is a great idea but the downside is one needs to create a
custom-fact each for every check you wanna perform. Isn''t there
anything a bit more dynamic, like checking the location on fly ( bash
equivalent: if [ -d "/var/torque/mom_priv" ]; ) ?? Cheers!!




On Sep 28, 4:33 pm, Peter Bukowinski <pmb...@gmail.com>
wrote:
>
> I''d create a custom fact that checks for the existence of the
mom_priv directory -- something like this:
>
> # mom_priv_test.rb
> if FileTest.directory?("/var/torque/mom_priv")
>     Facter.add("mom_priv_test") do
>         setcode { true }
>     end
> end
> #
>
> Now you can use this fact to wrap your file resource in an if statement:
>
> class mom_priv_config {
>     if $mom_priv_test == ''true'' {
>         file { ''/var/torque/mom_priv/config'':
>             ensure  => present,
>             owner    => ''root'',
>             group    => ''root'',
>             mode    => ''0644'',
>             content =>
template(''w_nodes/mom_priv-config.tpl''),
>             #notify  => Service[''pbs_mom''],
>         }
>     }
>
> }
>
> --
> Peter M. Bukowinski
> Sr. Systems Engineer
> Janelia Farm Research Campus, HHMI
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On 09/29/2011 12:38 AM, Sans wrote:
> Thanks Peter!
> Custom fact is a great idea but the downside is one needs to create a
> custom-fact each for every check you wanna perform. Isn''t there
> anything a bit more dynamic, like checking the location on fly ( bash
> equivalent: if [ -d "/var/torque/mom_priv" ]; ) ?? Cheers!!
>
>
>
>
> On Sep 28, 4:33 pm, Peter Bukowinski<pmb...@gmail.com>  wrote:
>>
>> I''d create a custom fact that checks for the existence of the
mom_priv directory -- something like this:
>>
>> # mom_priv_test.rb
>> if FileTest.directory?("/var/torque/mom_priv")
>>      Facter.add("mom_priv_test") do
>>          setcode { true }
>>      end
>> end
>> #
>>
>> Now you can use this fact to wrap your file resource in an if
statement:
>>
>> class mom_priv_config {
>>      if $mom_priv_test == ''true'' {
>>          file { ''/var/torque/mom_priv/config'':
>>              ensure  =>  present,
>>              owner    =>  ''root'',
>>              group    =>  ''root'',
>>              mode    =>  ''0644'',
>>              content => 
template(''w_nodes/mom_priv-config.tpl''),
>>              #notify  =>  Service[''pbs_mom''],
>>          }
>>      }
>>
>> }
Hello,

You can work it around with something like:

exec { ''mkdir -p 0644'':
   path => "/usr/bin:/usr/sbin:/bin",
   unless => "[ -d ''/var/torque/mom_priv'' ]"
}

Hope this helps.

-- 
Dominik Zyla

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On Sep 28, 5:38 pm, Sans <r.santanu....@gmail.com>
wrote:
> Thanks Peter!
> Custom fact is a great idea but the downside is one needs to create a
> custom-fact each for every check you wanna perform. Isn''t there
> anything a bit more dynamic, like checking the location on fly ( bash
> equivalent: if [ -d "/var/torque/mom_priv" ]; ) ?? Cheers!!

The idea in the first place runs somewhat against the grain for
Puppet: in general, you should prefer Puppet to tell, rather than to
ask.  Thus, the question is why Puppet doesn''t already know whether /
var/torque/mom_priv should exist.  By design, Puppet DSL has no direct
mechanism for specifying client-side logic.

That leaves you with three alternatives for configuring clients based
on unmanaged state details:

1) Use custom facts to report client state details to the master, and
perform the logic there.
2) Use an Exec to run a script, either as literal code or from a file.
3) Write a custom type and provider in Ruby that does what you want.

Where possible, I recommend avoiding all of those and instead managing
the state in question.


John

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