Puppet users - Oct 2012 - case statement exec

Hello,

I''m trying to send parameters to an Exec ("exec1") based on
values, using a
case statement.   I''ve tried putting the two versions of the exec in a
case
block, which failed (exec1 is a dependency of exec2, and exec2 complained
it could not find exec1), and a case statement can''t go directly
directly
into the parameters of the Exec itself

Google helped me with this thread:
http://comments.gmane.org/gmane.comp.sysutils.puppet.user/20597

But I wonder if there is a more modern way of doing it with 2.7.19 (or 3.0)?

Many thanks,
Eugene

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On Oct 31, 2012, at 8:52 AM, Eugene Vilensky wrote:
> Hello,
> 
> I''m trying to send parameters to an Exec ("exec1") based
on values, using a case statement.   I''ve tried putting the two
versions of the exec in a case block, which failed (exec1 is a dependency of
exec2, and exec2 complained it could not find exec1), and a case statement
can''t go directly directly into the parameters of the Exec itself
> 
> Google helped me with this thread:
http://comments.gmane.org/gmane.comp.sysutils.puppet.user/20597
> 
> But I wonder if there is a more modern way of doing it with 2.7.19 (or
3.0)?
> 
> Many thanks,
> Eugene
You may find the following example useful. It''s a syslog class I use
that uses case statements to set values for variables that are different
depending on the operating system:

class syslog {
    case $operatingsystem {
        ''Fedora'': {
            $servicename = ''rsyslog''
            $config = ''/etc/rsyslog.conf''
        }
        ''RedHat'',''Scientific'': {
            case $operatingsystemrelease {
                /^6.*/: {
                    $servicename = ''rsyslog''
                    $config = ''/etc/rsyslog.conf''
                }
                default: {
                    $servicename = ''syslog''
                    $config = ''/etc/syslog.conf''
                }
            }
        }
    }
    service { $servicename:
        ensure     => running,
        enable     => true,
        hasrestart => true,
        hasstatus  => true,
    }
    exec { "echo ''*.*;local4.none               @rsyslog''
>> ${config}":
        unless  => "grep -e
''^\*\.\*;local4.none.*rsyslog$'' ${config}",
        notify  => Service[$servicename],
    }
    file { ''/tmp/.syslog_restarted'':
        ensure  => file,
        content => ''.'',
        notify  => Service[$servicename],
    }
}

If this doesn''t help, can paste your code here so we give more specific
feedback?

-- 
Peter Bukowinski


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On Wednesday, October 31, 2012 7:53:21 AM UTC-5, Trammael
wrote:
>
> Hello,
>
> I''m trying to send parameters to an Exec ("exec1") based
on values, using
> a case statement.   I''ve tried putting the two versions of the
exec in a
> case block, which failed (exec1 is a dependency of exec2, and exec2 
> complained it could not find exec1)
>

That sounds like a different problem.  If some other resource depends on 
Exec[''exec1''], then you must ensure that it is declared.  That
declaration
can certainly be in a case statement, but then you do need to ensure that 
every case declares a version of the Exec.

 
> , and a case statement can''t go directly directly into the
parameters of
> the Exec itself
>

No, that''s what selectors are for:

exec { ''exec1'':
  command => $color ? {
    blue => ''/sbin/aix-foo'',
    silver => ''/sbin/osx_foo'',
    red => ''/sbin/rhel_foo'',
    default => ''/sbin/foo''
  }
}


Alternatively, you can assign the parameters to variables inside your case 
statement, then set the resource parameters via the variable values.
 
>
> Google helped me with this thread: 
> http://comments.gmane.org/gmane.comp.sysutils.puppet.user/20597
>
> But I wonder if there is a more modern way of doing it with 2.7.19 (or 
> 3.0)?
>
>
 
There is also the alternative of loading the wanted data from an external 
data source.  That''s not more "modern", really, as Puppet has
had external
data facilities for a long time.  The community has, however, coalesced 
around "Hiera" for accessing external data.  That was available as far
back
as Puppet 2.6, I believe, but it was a third-party add-on until its 
integration into the core in Puppet 3.


John

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