apt-init.pp

class apt-get::update {
  exec { "apt-get update":
    command => "apt-get update"
  }
}

nginx-init.pp

import "apt-get"

class nginx {
  include apt-get::update

  exec { "nginx:import-gpg-key":
    command => "wget -q -O - http://nginx.org/keys/nginx_signing.key | sudo apt-key add -",
  }

  exec { "nginx:add-repo":
    command => "echo 'deb http://nginx.org/packages/ubuntu/ precise nginx' | sudo tee /etc/apt/sources.list.d/nginx.list",
    require => Exec["nginx:import-gpg-key"],
  }

  file { "nginx:source.list":
    ensure  => file,
    path    => "/etc/apt/sources.list.d/nginx.list",
    content => "deb http://nginx.org/packages/ubuntu/ precise nginx",
    require => Exec["nginx:add-repo"],
    owner   => "root",
    group   => "root",
  }

  package { "nginx":
    ensure  => installed,
    require => [File["nginx:source.list"], Exec["apt-get update"]],
  }

  file { "/etc/nginx/conf.d/default":
    ensure  => absent,
    require => Package["nginx"],
  }

  file { "/etc/nginx/nginx.conf":
    ensure  => file,
    content => template("nginx/nginx.conf.erb"),
    require => Package["nginx"],
    owner   => "root",
    group   => "root",
  }

  file { "/etc/nginx/sites-enabled":
    ensure  => absent,
    recurse => true,
    force   => true,
    require => Package["nginx"],
  }

  file { "/etc/nginx/sites-available":
    ensure  => absent,
    recurse => true,
    force   => true,
    require => Package["nginx"],
  }

  file { "/var/www":
    ensure => directory,
    owner  => "www-data",
    group  => "www-data",
    mode   => "0770",
  }

  file { "/etc/nginx/ssl":
    ensure  => directory,
    owner   => "root",
    group   => "root",
    mode    => "0700",
    require => Package["nginx"]
  }

  exec { "nginx:test":
    command => "nginx -t",
    require => File["/etc/nginx/nginx.conf"],
  }

  service { "nginx":
    ensure     => running,
    enable     => true,
    hasrestart => true,
    hasstatus  => true,
    subscribe  => File["/etc/nginx/nginx.conf"],
    require    => Exec["nginx:restart"],
  }

  exec { "nginx:restart":
    command => "/etc/init.d/nginx restart",
    require => Exec["nginx:test"],
  }
}