Puppet users - Dec 2007 - Build a cmdline for exec from optional parameters

How can I do this?:
 
foo { name:
    $bar => "frob"
}
 
define foo( $bar = false, $baz = false ) {
    if  #$bar and $baz both defined
        $cmd = "frobnicate --bar=$bar --baz=$baz ${name}" 
    else if #$bar defined
        $cmd = "frobnicate --bar=$bar ${name}" 
    else if #$baz defined
        $cmd = "frobnicate --baz=$baz ${name}" 
    else 
        $cmd = "frobnicate ${name}"
}
 
This works for 2 optional parameters, but doesn''t scale
 
Thanks
--e
 
 
Eugene Ventimiglia
Director of Systems
GridApp Systems
e: eventi@gridapp.com
o: 646 452 4081
 


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On Dec 24, 2007, at 10:32 AM, Eugene Ventimiglia wrote:
> How can I do this?:
>
> foo { name:
>     $bar => "frob"
> }
>
> define foo( $bar = false, $baz = false ) {
>     if  #$bar and $baz both defined
>         $cmd = "frobnicate --bar=$bar --baz=$baz ${name}"
>     else if #$bar defined
>         $cmd = "frobnicate --bar=$bar ${name}"
>     else if #$baz defined
>         $cmd = "frobnicate --baz=$baz ${name}"
>     else
>         $cmd = "frobnicate ${name}"
> }
>
Hrm.  The only real options are to make a new string variable for  
every parameter (just extending it with "" when no value is provided)
or use a custom function to concatenate them all.

  --
  A motion to adjourn is always in order.
            --Robert Heinlein
  ---------------------------------------------------------------------
  Luke Kanies | http://reductivelabs.com | http://madstop.com

That''s what I wound up doing:

    $kickstart_opt = $kickstart ? {
            false   => '''',
            default => "
--kickstart=/var/lib/cobbler/kickstarts/${kickstart}"
    }
    $kickstart_test = $kickstart ? {
            false   => "grep \"kickstart\\s*:
<<inherit>>\"",
            default => "grep \"kickstart\\s*:
/var/lib/cobbler/kickstarts/${kickstart}\""
    }
    $ip_opt = $ip ? {
            false   => '''',
            default => " --ip=${ip}"
    }
    $ip_test = $ip ? {
            false   => "grep \"ip address\\s*:\\s*$\"",
            default => "grep \"ip address\\s*: ${ip}\""
    }
    $hostname_opt = $hostname ? {
            false   => " --hostname=${name}",
            default => " --hostname=${hostname}"
    }
    $hostname_test = $hostname ? {
            false   => "grep \"hostname\\s*: ${name}\"",
            default => "grep \"hostname\\s*:
${hostname}\""
    }


    $addcmd = "cobbler system add --name=${name} --profile=${profile}
--mac=${mac} \
        ${kickstart_opt}${ip_opt}${hostname_opt}"

    $editcmd = "cobbler system edit --name=${name} --profile=${profile}
--mac=${mac} \
        ${kickstart_opt}${ip_opt}${hostname_opt}" 

-----Original Message-----
From: puppet-users-bounces@madstop.com
[mailto:puppet-users-bounces@madstop.com] On Behalf Of Luke Kanies
Sent: Thursday, December 27, 2007 8:21 PM
To: Puppet User Discussion
Subject: Re: [Puppet-users] Build a cmdline for exec from optional
parameters

On Dec 24, 2007, at 10:32 AM, Eugene Ventimiglia wrote:
> How can I do this?:
>
> foo { name:
>     $bar => "frob"
> }
>
> define foo( $bar = false, $baz = false ) {
>     if  #$bar and $baz both defined
>         $cmd = "frobnicate --bar=$bar --baz=$baz ${name}"
>     else if #$bar defined
>         $cmd = "frobnicate --bar=$bar ${name}"
>     else if #$baz defined
>         $cmd = "frobnicate --baz=$baz ${name}"
>     else
>         $cmd = "frobnicate ${name}"
> }
>
Hrm.  The only real options are to make a new string variable for every
parameter (just extending it with "" when no value is provided) or use
a
custom function to concatenate them all.

  --
  A motion to adjourn is always in order.
            --Robert Heinlein
  ---------------------------------------------------------------------
  Luke Kanies | http://reductivelabs.com | http://madstop.com


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Puppet-users@madstop.com
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