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exec {"something":
  command  => "bash -c 'for i in `ls /etc/apt/keys.d/*.{asc,pub,key}`; do apt-key add \$i; done'",
  path     => "/usr/bin:/usr/sbin:/bin:/sbin",
  logoutput => true,
}

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rpm -qpf --requires ~/yum.puppetlabs.com/el/5/products/x86_64/puppet-3.0.0-1.el5.noarch.rpm | grep ruby
/usr/bin/ruby  
libselinux-ruby  
ruby >= 1.8.7
ruby(abi) >= 1.8
ruby-augeas  
ruby-shadow 

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node default {
  class { "profile::base": }
}

class profile::base {
  class { "ntp": }
}

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General:

Currently, there are several cases regarding database setup in the PE installer. Note that the database setup routines only occur if the console is selected for install.

1) the installer checks for the existence of mysql.
  * If it is found, the installer asks if the mysql server is running on a remote host. if it is remote, the user is prompted to enter host
    and port information. if it is not remote, the installer assumes the mysql server is hosted on the current stations.

  * If it is not found, the installer asks if the user would like to install MySQL server. If yes, the installer proceeds directly to step 3, below, skipping step 2.
    Note: the install *will exit* if the user opts not to install MySQL server at this point. The installer does not support installing MySQL client only.

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class RabbitMQ {
    package { 'rabbitmq-server':
            ensure  => present,
            require => Exec['add_rabbitmq_repository'],
    }

    exec { "wget -O- http://www.rabbitmq.com/rabbitmq-signing-key-public.asc | apt-key add - && apt-get update"
        alias   => 'add_rabbitmq_repository',
        require => File["/etc/apt/sources.list.d/rabbitmq.list"],
        unless  => "dpkg -l rabbitmq-server",

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Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> a=()
>>> a+=(2,)
>>> print(a)
(2,)
>>> 

Python 3.2.2 (default, Apr  5 2012, 18:13:42) 

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  523  git checkout 2.7.x
  524  git pull origin 2.7.x
  525  git checkout -b ticket/2.7.x/4426
  526  git cherry-pick 00e1882390
  527  git cherry-pick b6d5b2ed15
  528  git cherry-pick 649c507656