Using the puppet config parser for a configfile in your own project.

puppet-parser-elsewhere.rb

#!/usr/bin/env ruby
#

require "rubygems"
require "puppet" # gem puppet
require "ap" # gem awesome_print

# Need to define a type for each type we want to have.
# Otherwise, unknown types are errors in puppet.
Puppet::Type.newtype(:input) do
  newproperty(:name) do
    desc "Input URL"
  end # property :name

  newproperty(:tags) do
    desc "Tags for an input"
  end # property 'tags'
end # type 'input'

# This is where we put the puppet manifest code. You could just use a file
# here, but I'm inlining it for easy reading.
Puppet[:code] = <<EOF
input {
  [ "/var/log/messages", "/var/log/auth.log" ]:
    tags => ["linux-syslog"];
  [ "/var/log/apache2/access.log" ]:
    tags => ["apache-access"];
}

# even custom defines work.
define fancypants() {
  input {
    "/tmp/$name":
      tags => ["fancypants"];
    "/tmp/$name.1":
      tags => ["fancypants"];
    "/tmp/$name.2":
      tags => ["fancypants"];
  }
}

fancypants {
  "hello": ;
}
EOF

# Now compile a catalog from our code.
node = Puppet::Node.find("default")
catalog = Puppet::Resource::Catalog.find("default", :use_node => node)

# Each vertex is a resource.
catalog.vertices.each do |resource|
  next if ["Class", "Stage"].include?(resource.type )
  puts "Found resource '#{resource.to_s}' with tags: #{resource[:tags].inspect}"
  
end

running it

% ruby puppet-parser-elsewhere.rb 
Found resource 'Input[/tmp/hello.2]' with tags: "fancypants"
Found resource 'Input[/var/log/auth.log]' with tags: "linux-syslog"
Found resource 'Input[/tmp/hello.1]' with tags: "fancypants"
Found resource 'Input[/tmp/hello]' with tags: "fancypants"
Found resource 'Fancypants[hello]' with tags: nil
Found resource 'Input[/var/log/apache2/access.log]' with tags: "apache-access"
Found resource 'Input[/var/log/messages]' with tags: "linux-syslog"

Bugs found so far in this hack:

• parser functions aren't run
• defaults don't work, like: "Input { tags => ... }"
• overrides don't work, like: "Input <| query |> { tags +> 'something'} " - results in this error:

/usr/lib/ruby/gems/1.8/gems/puppet-2.6.2/lib/puppet/parser/compiler.rb:21:in `compile': Puppet::Parser::Compiler failed with error NoMethodError: undefined method `merge' for []:Array on node default (Puppet::Error)