On Wed, Apr 21, 2010 at 8:42 PM, Sukh Khehra <skhe...@proofpoint.com> wrote:
> Forgot to mention that I am running version puppet-0.25.4-1 on both
> sides on centos 5.4.
>
> -----Original Message-----
> From: Sukh Khehra
> Sent: Wednesday, April 21, 2010 8:39 PM
> To: 'puppet-users@googlegroups.com'
> Subject: variable interpolation weirdness
>
> Can someone please explain what's happening here? Let me know if you
> need more info. Thanks in advance for your time.
>
> I have a module called abc. This is the init.pp for that module.
>
>
> ###################
> $ cat modules/production/abc/manifests/init.pp
> # Puppet Module: abc
> #
>
> class abc {
> package { "maatkit": ensure => present }
> }
>
> class abc::base inherits abc {
> exec { "testvars": command => "/bin/echo
> 'java_version=${java_version}'", logoutput => true; }
> }
>
> class abc::test {
> $java_version = "jdk1.6.0_14"
> include abc::base
> }
> ###################
>
>
> I accidently assigned both the "abc" and "abc::test" class to a host and
> noticed that the variable "java_version" no longer gets interpolated.
> E.g. here's the puppet run log.
>
> # puppetd -t
> notice: Ignoring --listen on onetime run
> info: Retrieving plugin
> info: Caching catalog for abc1.staging.pp.com
> info: Applying configuration version '1271906581'
> notice: //abc::base/Exec[testvars]/returns: java_version=
> notice: //abc::base/Exec[testvars]/returns: executed successfully
> warning: Value of 'preferred_serialization_format' (pson) is invalid for
> report, using default (marshal)
> notice: Finished catalog run in 3.21 seconds
>
> Hi Sukh,
Both classes are included but the $java_version is defined in a different
scope than the include of abc on your node.
node
|--include "abc" <-- in this scope $java_version has not been defined
|--include "abc::test" <- $java_version is defined
|-- include "abc" <-- The variable affects this scope, but is already
included, then not used again.
> But If I only assign the host the "abc::test" class, everything works ok
> like so:
>
> # puppetd -t
> notice: Ignoring --listen on onetime run
> info: Retrieving plugin
> info: Caching catalog for abc1.staging.pp.com
> info: Applying configuration version '1271906581'
> notice: //abc::base/Exec[testvars]/returns: java_version=jdk1.6.0_14
> notice: //abc::base/Exec[testvars]/returns: executed successfully
> warning: Value of 'preferred_serialization_format' (pson) is invalid for
> report, using default (marshal)
> notice: Finished catalog run in 3.21 seconds
>
> In here the abc::test class defines the $java_version and when the abc
class is included(only one time) the exec prints the value of the variable
that is in the same scope.
Here you will find a detailed explanation of variable scope and inheritance.
http://docs.puppetlabs.com/guides/troubleshooting.html#common_misconceptions
Hope that helps.
>
> So I obviously know what to do to fix the problem but would love to
> understand what's happening here.
>
> Regards,
> Sukh
>
>
>
>
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--
Tony
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