Issue #5429 has been reported by Juerg Walz.

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Bug #5429: Inconsistent "Duplicate definition" error
https://projects.puppetlabs.com/issues/5429

Author: Juerg Walz
Status: Unreviewed
Priority: Normal
Assignee: 
Category: stages
Target version: 
Affected Puppet version: 2.6.3
Keywords: duplicate definition stages
Branch: 


The following error occurs when I run the Puppet agent a second time after 
restarting the Puppet Master (running it for the first time after the restart 
works successfully):

    # puppet agent --test
    err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
Duplicate definition: Class[Yum::Os] is already defined; cannot redefine at 
/etc/puppet/modules/csdev/yum/manifests/os.pp:100 on node puppet.example.com
    warning: Not using cache on failed catalog
    err: Could not retrieve catalog; skipping run
    # service puppetmaster restart
    Stopping puppetmaster:                                     [  OK  ]
    Starting puppetmaster:                                     [  OK  ]
    # puppet agent --test
    info: Caching catalog for puppet.example.com
    info: Applying configuration version '1291183870'
    notice: Finished catalog run in 11.80 seconds
    # puppet agent --test
    err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
Duplicate definition: Class[Yum::Os] is already defined; cannot redefine at 
/etc/puppet/modules/csdev/yum/manifests/os.pp:100 on node puppet.example.com
    warning: Not using cache on failed catalog
    err: Could not retrieve catalog; skipping run

The agent and master are running on the same system.
No changes to the configuration were made during this process. 

The problem appears to be with the Run Stages configuration. Here are the 
important bits from yum/manifests/os.pp (line 100 is the closing bracket of the 
"second" class block):

    class yum::os {
    [actual class definition removed]
    }
    include stages
    class { 'yum::os' :
    stage => 'package-manager-setup',
    }

And the Run Stages definition:

    class stages {
    stage { 'package-manager-setup' : before => Stage['main'], }
    }




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