[stitcherg5k] Generate yaml configuration for G5K stitcher

Related to bug 14893.

Generate file added in this merge request.

lib/refrepo/gen/puppet/stitcherg5k.rb

+
+VLANS_FILE = "input/grid5000/vlans.yaml"
+
+PLATFORM = "platforms/production"
+HIERA_STITCHER_TEMPLATE = "#{PLATFORM}/generators/stitcher/stitcher.yaml"
+HIERA_STITCHER_OUTPUT_PATH = "#{PLATFORM}/modules/generated/files/grid5000/stitcher/stitcher.yml"
+
+STITCHER_MODES = ['production', 'development', 'test']
+
+# main method
+def generate_puppet_stitcherg5k(options)
+  $options = options
+  output_file_path = "#{$options[:output_dir]}/#{HIERA_STITCHER_OUTPUT_PATH}"
+  puts "Writing stitcher configuration in #{output_file_path}"
+  output = File.new(output_file_path, "w+")
+  refapi = load_data_hierarchy
+
+  base_config = YAML.load_file("#{$options[:output_dir]}/#{HIERA_STITCHER_TEMPLATE}")
+  sorted_kavlans = Hash.new
+
+  # Ruby sorting dark magic happening below:
+  #   The goal is to order the vlans entries by vlan id to have an easy to read conf file.
+  #   Since ruby hashes enumerate their values in the order
+  #   that the corresponding keys were inserted, we sort the
+  #   vlan keys and reinsert them back with their values in a
+  #   new hash that is de facto sorted.
+  build_stitcher_kavlans_hash(refapi)
+    .sort_by {|key, _value| key}
+    .each {|a| sorted_kavlans[a[0]] = a[1]}
+
+  output_hash = merge_config(base_config, sorted_kavlans)
+  output.write("# MANAGED BY PUPPET\n")
+  output.write(output_hash.to_yaml)
+end
+
+def build_stitcher_kavlans_hash(refapi)
+  stitcher_kavlans_hash = {}
+  refapi['sites'].each do |name, site_hash|
+    global_kavlan = site_hash['kavlans'].select { | id, _hash | id =~ /\d\d/ }.first
+    global_kavlan_id = global_kavlan.first.to_i
+    stitcher_kavlans_hash[global_kavlan_id] = {"vlan" => 700 + global_kavlan_id, "site" => name}
+  end
+  return stitcher_kavlans_hash
+end
+
+def merge_config(base_config, kavlans)
+  output_hash = {}
+  STITCHER_MODES.each do |mode|
+    output_hash[mode] = {'kavlans' => kavlans}
+    base_config.each do |key, value|
+      output_hash[mode][key] = value
+    end
+  end
+  return output_hash
+end