Puppet users - Mar 2009 - Howto depend on a package from another class?

Hi,

I have a class and want to depend on a Package from another class, how do I
solve this ??
I have 2 classes one is called openldap-client and the other is called
pam-ldap. I want pam-ldap to depend on the openldap-client class which has
a Package called openldap-client.

I''ve tried the following: 

- openldap-client::Package["openldap-client"]
- Class[openldap-client]::Package["openldap-client"]

Has anyone got a good solution to this or is it a bad idea to make such a
dependency?


Kind regards,

Ivo

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On Wed, Mar 18, 2009 at 09:09:47AM +0100, Ivo van der Meer
wrote:
> 
> Hi,
> 
> I have a class and want to depend on a Package from another class, how do I
> solve this ??
Just depend on the package.  Then you don''t have to care who provides
it.

Is is that you want to the dependency on the package to trigger the
inclusion of the class which manages it?  That would be a different
story.

-- 
Bruce

If the universe were simple enough to be understood, we would be too
simple to understand it.

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Have you tried within the Package instruction for pam-ldap:-

require => Package["openldap-client"]

or if the openldap-client package is wrapped up in a class

require => Class["openldap-client"]

Cheers
Paul

2009/3/18 Ivo van der Meer <ivo@crewtty.ath.cx>
>
> Hi,
>
> I have a class and want to depend on a Package from another class, how do I
> solve this ??
> I have 2 classes one is called openldap-client and the other is called
> pam-ldap. I want pam-ldap to depend on the openldap-client class which has
> a Package called openldap-client.
>
> I''ve tried the following:
>
> - openldap-client::Package["openldap-client"]
> - Class[openldap-client]::Package["openldap-client"]
>
> Has anyone got a good solution to this or is it a bad idea to make such a
> dependency?
>
>
> Kind regards,
>
> Ivo
>
> >
>

-- 
Paul Matthews
----------------------------------------------------------------------

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Hmm...that''s interesting.

As far as I know, there are no adverse side effects to just including
the other class in the dependent class.

I.e.

class pam-ldap {
  include "openldap-client"
}

If anyone does know of a problem with this, could you shed some light on it?

It may increase compile time due to multiple includes, but I''m not
sure about that since, in theory, it should just be a noop if it''s
already been included (haven''t checked the code).

Trevor

On Wed, Mar 18, 2009 at 05:29, paul matthews
<paulsmatthews@googlemail.com> wrote:
> Have you tried within the Package instruction for pam-ldap:-
>
> require => Package["openldap-client"]
>
> or if the openldap-client package is wrapped up in a class
>
> require => Class["openldap-client"]
>
> Cheers
> Paul
>
> 2009/3/18 Ivo van der Meer <ivo@crewtty.ath.cx>
>>
>> Hi,
>>
>> I have a class and want to depend on a Package from another class, how
do
>> I
>> solve this ??
>> I have 2 classes one is called openldap-client and the other is called
>> pam-ldap. I want pam-ldap to depend on the openldap-client class which
has
>> a Package called openldap-client.
>>
>> I''ve tried the following:
>>
>> - openldap-client::Package["openldap-client"]
>> - Class[openldap-client]::Package["openldap-client"]
>>
>> Has anyone got a good solution to this or is it a bad idea to make such
a
>> dependency?
>>
>>
>> Kind regards,
>>
>> Ivo
>>
>>
>
>
>
> --
> Paul Matthews
> ----------------------------------------------------------------------
>
> >
>
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Hi,

Thanks for all the replys, it really helped!

Here is my pam-ldap class, which depends on the openldap-client class and
works fine with the help I got from you guys. It thought it was harder than
it is.. Just add require => Package["openldap-client"] and it works
since
it''s coming from openldap-client class which my node included.

-------
class pam-ldap {

  case $operatingsystem {
    FreeBSD: { $packagelist = ["pam_ldap", "pam_mkhomedir"]
}
  }

  package { $packagelist:
        ensure => installed,
        require => Package["openldap-client"]
  }

  case $operatingsystem {
    FreeBSD: {
      file {
        "/etc/pam.d/system":
        source =>
"puppet:///configuration/ldapauth/pam.d/freebsd/system",
        owner => root,
        group => wheel,
        mode => 644,
        require => Package["pam_ldap", "pam_mkhomedir"];

        "/etc/pam.d/sshd":
        source =>
"puppet:///configuration/ldapauth/pam.d/freebsd/sshd",
        owner => root,
        group => wheel,
        mode => 644,
        require => Package["pam_ldap", "pam_mkhomedir"];
      }
    }
  }
}
-------




On Wed, 18 Mar 2009 09:29:44 +0000, paul matthews
<paulsmatthews@googlemail.com> wrote:
> Have you tried within the Package instruction for pam-ldap:-
> 
> require => Package["openldap-client"]
> 
> or if the openldap-client package is wrapped up in a class
> 
> require => Class["openldap-client"]
> 
> Cheers
> Paul
> 
> 2009/3/18 Ivo van der Meer <ivo@crewtty.ath.cx>
> 
>>
>> Hi,
>>
>> I have a class and want to depend on a Package from another class, how
do
>> I
>> solve this ??
>> I have 2 classes one is called openldap-client and the other is called
>> pam-ldap. I want pam-ldap to depend on the openldap-client class which
>> has
>> a Package called openldap-client.
>>
>> I''ve tried the following:
>>
>> - openldap-client::Package["openldap-client"]
>> - Class[openldap-client]::Package["openldap-client"]
>>
>> Has anyone got a good solution to this or is it a bad idea to make such
a
>> dependency?
>>
>>
>> Kind regards,
>>
>> Ivo
>>
>> >
>>
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On Wed, Mar 18, 2009 at 06:31:36AM -0400, Trevor Vaughan
wrote:
> 
> I.e.
> 
> class pam-ldap {
>   include "openldap-client"
> }
> 
> If anyone does know of a problem with this, could you shed some light on
it?
There are several potential problems with it; the way puppet works, the
point at which a class is included can be very important.   For example,
if the openldap-client class is sensitive to global variables, which
might be set differently in different contexts, then this might include
the class early, before those have been set.  It also forces the
inclusion of that specific class, rather than any class that might
inherit from it.

So it all hangs on the way the OP uses these classes, but I do find it
very important in puppet to avoid unnecessary dependences.

-- 
Bruce

Hierophant: someone who remembers, when you are on the way down,
everything you did to them on the way up.

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