dynamically named variables?

[Guy Matz]

Hi!  I have a parameterized class that accepts a few parameters, one of which I would like to use in the retrieval of hiera data, e.g.

class foo (  $app_user = 'bar' ) {

    file { "/etc/${app_user::etc_dir}":

    owner   => 'root',

    group   => 'root',

    mode    => '0644

}

so app_user should get passed to the class, then ${app_user}::etc_dir should get resolved by hiera,  If I pass in nagios as app_user, then nagios::etc_dir should be looked up in hiera.  I can't find the right combination of curly braces to get this to work.  Should it work?

Thanks a lot,

Guy

[Dan White]

It may take a step in the middle like this:

class foo (  $app_user = 'bar' ) {

  
    $where = "/etc/${app_user::etc_dir}"

    file { $where :

    owner   => 'root',

    group   => 'root',

    mode    => '0644

}

Good luck.  We are all here to share the info.

“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)

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[Henrik Lindberg]

On 2014-15-12 18:57, Guy Matz wrote:
> Hi! I have a parameterized class that accepts a few parameters, one
> of which I would like to use in the retrieval of hiera data, e.g.
> class foo ( $app_user = 'bar' ) {
> file { "/etc/${app_user::etc_dir}":

What do you expect the result to be here, are you trying to do an
indirection to the variable $bar::etc_dir ? (That will not work, it will
interpolate
the value of $app_user::etc_dir irrespective of what the value of the
$app_user parameter is set to. You probably wanted ${app_user}::etc_dir.

> owner => 'root',
> group => 'root',
> mode => '0644
> }
>
> so app_user should get passed to the class, then ${app_user}::etc_dir
> should get resolved by hiera, If I pass in nagios as app_user, then
> nagios::etc_dir should be looked up in hiera. I can't find the right
> combination of curly braces to get this to work. Should it work?
>

You can lookup the key specifically using one of the hiera functions.
This way you can construct the key you want out of the given parameter
and the additional part (::etc_dir).

Regards
- henrik

> Thanks a lot,
> Guy
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[Stephen Marlow]

I would personally take the route of explicitly looking up the hiera data, along these lines:

class foo ($app_user = 'bar') {

  $dir = hiera("${app_user}::etc_dir")

  file { "/etc/${dir}":

    ...

  }

}

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