Puppet users - Oct 2011 - how to check if a hash/array is empty or not in puppet .pp/module (not in template)?

Dear all,

I have a parameterized class and one of the args is a hash or an array
and I would like to check if they are empty or not?

I tried with

class test($hash, $array){
   if $hash.empty? == true
{
}
  if $array.empty? == true
{
}

}

but when I just
puppet parser validate init.pp

I would get this error: Could not parse for environment production:
Syntax error at ''.''; expected ''}'' at.

Please help as this is important to know how to do this type of check.

Thank you in advance.

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On Thu, 13 Oct 2011 10:01:49 -0700, midair77 wrote:
> 
> Dear all,
> 
> I have a parameterized class and one of the args is a hash or an array
> and I would like to check if they are empty or not?
> 
> I tried with
> 
> class test($hash, $array){
>    if $hash.empty? == true
> {
> }
>   if $array.empty? == true
> {
> }
> 
> }
> 
> but when I just
> puppet parser validate init.pp
> 
> I would get this error: Could not parse for environment production:
> Syntax error at ''.''; expected ''}'' at.
> 
> Please help as this is important to know how to do this type of check.
> 
> Thank you in advance.
> 
The cleanest way to do this would be to write a custom rvalue function
that does the Ruby check for you.  You can''t call ruby directly from
the
puppet language, so you need to use functions or inline templates.  I
definitely recommend going the function route, since it''s much easier
to
write tests for those, and your manifests end up looking much cleaner.

http://docs.puppetlabs.com/guides/custom_functions.html

-- 
Jacob Helwig

Thank you very much..  I am writing a function to do that.


On Oct 13, 10:51 am, Jacob Helwig <ja...@puppetlabs.com>
wrote:
> On Thu, 13 Oct 2011 10:01:49 -0700, midair77 wrote:
>
> > Dear all,
>
> > I have a parameterized class and one of the args is a hash or an array
> > and I would like to check if they are empty or not?
>
> > I tried with
>
> > class test($hash, $array){
> >    if $hash.empty? == true
> > {
> > }
> >   if $array.empty? == true
> > {
> > }
>
> > }
>
> > but when I just
> > puppet parser validate init.pp
>
> > I would get this error: Could not parse for environment production:
> > Syntax error at ''.''; expected ''}''
at.
>
> > Please help as this is important to know how to do this type of check.
>
> > Thank you in advance.
>
> The cleanest way to do this would be to write a custom rvalue function
> that does the Ruby check for you.  You can''t call ruby directly
from the
> puppet language, so you need to use functions or inline templates.  I
> definitely recommend going the function route, since it''s much
easier to
> write tests for those, and your manifests end up looking much cleaner.
>
> http://docs.puppetlabs.com/guides/custom_functions.html
>
> --
> Jacob Helwig
>
>  signature.asc
> < 1KViewDownload
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Please share it back with the list when you get it working.

Thanks.

“Sometimes I think the surest sign that intelligent life exists elsewhere in the
universe is that none of it has tried to contact us.”
Bill Waterson (Calvin & Hobbes)

----- midair77 <midair77@gmail.com> wrote:
> Thank you very much..  I am writing a function to do that.
> 
> 
> On Oct 13, 10:51 am, Jacob Helwig <ja...@puppetlabs.com> wrote:
> > On Thu, 13 Oct 2011 10:01:49 -0700, midair77 wrote:
> >
> > > Dear all,
> >
> > > I have a parameterized class and one of the args is a hash or an
array
> > > and I would like to check if they are empty or not?
> >
> > > I tried with
> >
> > > class test($hash, $array){
> > >    if $hash.empty? == true
> > > {
> > > }
> > >   if $array.empty? == true
> > > {
> > > }
> >
> > > }
> >
> > > but when I just
> > > puppet parser validate init.pp
> >
> > > I would get this error: Could not parse for environment
production:
> > > Syntax error at ''.''; expected
''}'' at.
> >
> > > Please help as this is important to know how to do this type of
check.
> >
> > > Thank you in advance.
> >
> > The cleanest way to do this would be to write a custom rvalue function
> > that does the Ruby check for you.  You can''t call ruby
directly from the
> > puppet language, so you need to use functions or inline templates.  I
> > definitely recommend going the function route, since it''s
much easier to
> > write tests for those, and your manifests end up looking much cleaner.
> >
> > http://docs.puppetlabs.com/guides/custom_functions.html
> >
> > --
> > Jacob Helwig
> >
> >  signature.asc
> > < 1KViewDownload
> 
> -- 
> You received this message because you are subscribed to the Google Groups
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> To post to this group, send email to puppet-users@googlegroups.com.
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> 
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On Thu, Oct 13, 2011 at 11:41 AM, midair77 <midair77@gmail.com>
wrote:
> Thank you very much..  I am writing a function to do that.
>
>
> On Oct 13, 10:51 am, Jacob Helwig <ja...@puppetlabs.com> wrote:
>> On Thu, 13 Oct 2011 10:01:49 -0700, midair77 wrote:
>>
>> > Dear all,
>>
>> > I have a parameterized class and one of the args is a hash or an
array
>> > and I would like to check if they are empty or not?
>>
>> > I tried with
>>
>> > class test($hash, $array){
>> >    if $hash.empty? == true
>> > {
>> > }
>> >   if $array.empty? == true
>> > {
>> > }
>>
>> > }
>>
>> > but when I just
>> > puppet parser validate init.pp
>>
>> > I would get this error: Could not parse for environment
production:
>> > Syntax error at ''.''; expected
''}'' at.
>>
>> > Please help as this is important to know how to do this type of
check.
>>
>> > Thank you in advance.
See empty function:
https://github.com/puppetlabs/puppetlabs-stdlib/tree/master/lib/puppet/parser/functions

Thanks,

Nan

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Hello,

[...]
> See empty
function:https://github.com/puppetlabs/puppetlabs-stdlib/tree/master/lib/puppe...
There is newer version soon to be merged with stdlib:
https://github.com/kwilczynski/puppet-functions/blob/master/lib/puppet/parser/functions/empty.rb

KW

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Hello,

Nan +1

[...]
> See empty
function:https://github.com/puppetlabs/puppetlabs-stdlib/tree/master/lib/puppe...
[...]

Here is a newer version soon to be merged with stdlib:
https://github.com/kwilczynski/puppet-functions/blob/master/lib/puppet/parser/functions/empty.rb

KW

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Hello,

Apologies for double-posting. I''ve got 500 first time and
wasn''t sure
whether it went through.

KW

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