Puppet users - Apr 2012 - Unable to access hash elements directly from templates

I am using puppet version 6.2 (the one that comes with squeeze) in case it 
makes a difference.

I am new to puppet and am having a problem getting access to the elements 
of a hash in my erb templates and no matter what I google for I cannot seem 
to find out what I am doing wrong. 

I have stripped everything back to example code to rule out other things, 
in reality I have split my files up a but to avoid the monolithic init.pp 
and nodes.pp. Anyway...

my nodes.pp has this in it:

node ''pc01.domain.com'' {

  # Test code
  $myhash = { 
    key => { 
      subkey1 => ''foo'',
      subkey2 => ''bar''
    }
  }

  include mymodule
}

Then in the modules init.pp I have:

class mymodule {
  # Test code
  notice($myhash[key][subkey1])
  notice($myhash[key][subkey2])
  file { "/tmp/test":
    ensure => present,
    content => template("mymodule/test.erb"),
  }
}

If I run puppet against this the two notice lines work fine so I have 
access to the data within the module, the problem is getting it into the 
template. I tried a few different syntaxes to no effect:

So first I tried a template like so:
TEST: <%= $myhash[key][subkey1] %>

This gave me the error:
*err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
Failed to parse template mymodule/test.erb: Could not find value for
''key''
at /etc/puppet/modules/mymodule/manifests/init.pp:7 on node pc01.domain.com*

If I quote the string in the template (i.e. "<%= $myhash[key][subkey1]
%>")
then it just spits out that string into the file rather than interpreting 
the data.

I have similar errors if I try to use scope.lookupvar to explicitly specify 
where things are too.

So, what am I doing wrong or is it just not possible to pick a single hash 
element and put it into a template.

Thanks
Josh
p.s. my Ruby sucks so if I have to go down that route it''ll need to be
a
noddy explanation

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Hey Josh,

Don''t use the $ for variables in Templates - Puppet variables and
arrays
are accessed as local variables/arrays in templates.  So try this:  TEST:
<%= myhash[key][subkey1] %>


On Wed, Apr 11, 2012 at 9:04 AM, Josh <josh@chickenmonkey.co.uk> wrote:
> I am using puppet version 6.2 (the one that comes with squeeze) in case it
> makes a difference.
>
> I am new to puppet and am having a problem getting access to the elements
> of a hash in my erb templates and no matter what I google for I cannot seem
> to find out what I am doing wrong.
>
> I have stripped everything back to example code to rule out other things,
> in reality I have split my files up a but to avoid the monolithic init.pp
> and nodes.pp. Anyway...
>
> my nodes.pp has this in it:
>
> node ''pc01.domain.com'' {
>
>   # Test code
>   $myhash = {
>     key => {
>       subkey1 => ''foo'',
>       subkey2 => ''bar''
>     }
>   }
>
>   include mymodule
> }
>
> Then in the modules init.pp I have:
>
> class mymodule {
>   # Test code
>   notice($myhash[key][subkey1])
>   notice($myhash[key][subkey2])
>   file { "/tmp/test":
>     ensure => present,
>     content => template("mymodule/test.erb"),
>   }
> }
>
> If I run puppet against this the two notice lines work fine so I have
> access to the data within the module, the problem is getting it into the
> template. I tried a few different syntaxes to no effect:
>
> So first I tried a template like so:
> TEST: <%= $myhash[key][subkey1] %>
>
> This gave me the error:
> *err: Could not retrieve catalog from remote server: Error 400 on SERVER:
> Failed to parse template mymodule/test.erb: Could not find value for
''key''
> at /etc/puppet/modules/mymodule/manifests/init.pp:7 on node
> pc01.domain.com*
>
> If I quote the string in the template (i.e. "<%=
$myhash[key][subkey1] %>")
> then it just spits out that string into the file rather than interpreting
> the data.
>
> I have similar errors if I try to use scope.lookupvar to explicitly
> specify where things are too.
>
> So, what am I doing wrong or is it just not possible to pick a single hash
> element and put it into a template.
>
> Thanks
> Josh
> p.s. my Ruby sucks so if I have to go down that route it''ll need
to be a
> noddy explanation
>
>  --
> You received this message because you are subscribed to the Google Groups
> "Puppet Users" group.
> To view this discussion on the web visit
> https://groups.google.com/d/msg/puppet-users/-/nSPGiquUVBIJ.
> To post to this group, send email to puppet-users@googlegroups.com.
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>


-- 

Gary Larizza
Professional Services Engineer
Puppet Labs

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On Wednesday, 11 April 2012 17:14:10 UTC+1, Gary Larizza
wrote:
>
> Don''t use the $ for variables in Templates - Puppet variables and
arrays
> are accessed as local variables/arrays in templates.  So try this:  TEST: 
> <%= myhash[key][subkey1] %>
>

Ah, I did try that before. I get the error:

err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
Failed to parse template mymodule/test.erb: Could not find value for
''key''
at /etc/puppet/modules/mymodule/manifests/config.pp:22 on node 
pc01.domain.com

Thanks
Josh

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Sorry, that should be:

err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
Failed to parse template mymodule/test.erb: Could not find value for
''key''
at /etc/puppet/modules/mymodule/manifests/init.pp:7 on node pc01.domain.com

(i.e. it errors on the content => ... line)

Josh

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Eventually I worked this out (nothing like trying every possible 
combination eh), solution was to remove the $ at the start as you said and 
also quote the keys in single quotes like so:

TEST: <%= myhash[''key''][''subkey1''] %>

Thanks again for your help
Josh

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