gistfile1.txt

# in manifests/default.pp

define append_if_no_such_line($file, $line, $refreshonly = 'false') {
   exec { "/bin/echo '$line' >> '$file'":
      unless      => "/bin/grep -Fxqe '$line' '$file'",
      path        => "/bin",
      refreshonly => $refreshonly,
   }
}

class must-have {
  include apt
  apt::ppa { "ppa:webupd8team/java": }

  exec { 'apt-get update':
    command => '/usr/bin/apt-get update',
    before => Apt::Ppa["ppa:webupd8team/java"],
  }

  exec { 'apt-get update 2':
    command => '/usr/bin/apt-get update',
    require => [ Apt::Ppa["ppa:webupd8team/java"], Package["git-core"] ],
  }

  package { ["vim",
             "curl",
             "git-core",
             "bash"]:
    ensure => present,
    require => Exec["apt-get update"],
    before => Apt::Ppa["ppa:webupd8team/java"],
  }

  package { ["oracle-java7-installer"]:
    ensure => present,
    require => Exec["apt-get update 2"],
  }

  exec {
    "accept_license":
    command => "echo debconf shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections && echo debconf shared/accepted-oracle-license-v1-1 seen true | sudo debconf-set-selections",
    cwd => "/home/vagrant",
    user => "vagrant",
    path    => "/usr/bin/:/bin/",
    require => Package["curl"],
    before => Package["oracle-java7-installer"],
    logoutput => true,
  }
}
include hadoop

================================

# later on, in modules/hadoop:

class hadoop {
...
  exec { "download_hadoop":
    command => "/tmp/grrr /hadoop/common/hadoop-${hadoop_version}/$hadoop_tarball -O /vagrant/$hadoop_tarball --read-timeout=5 --tries=0",
    timeout => 1800,
    path => $path,
    creates => "/vagrant/$hadoop_tarball",
    require => [ Package["oracle-java7-installer"], Exec["download_grrr"]]
  }
...
}