GH-130 Fix overwrite of user config data

Users may have their own config data specified for the PE Master group.
This commit ensures that when peadm enforces node group configuration
including config data on the PE Master group, it merges required config
into existing user data to avoid configuration loss.

Author: reidmv

Diff for: CHANGELOG.md

@@ -1,5 +1,14 @@
 # PEADM module
 
+## 2.4.2
+### Summary
+
+Bugfix release
+
+### Bugfixes
+
+- Previously, on upgrade, peadm could overwrite user configuration data on the PE Master group because it overwrote the entire configuration data value. This release modifies the peadm::setup::node\_manager desired state configuration to merge required configuration into any existing configuration when configuring data on the PE Master node group.
+
 ## 2.4.1
 ### Summary
 

Diff for: lib/puppet/functions/peadm/merge_ng_config_data.rb

@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+# @summary
+#   This function takes the name of a Node Group and a config data hash,
+#   returning the merge of the node group's current config data and the new
+#   information specified. It is intended to be used in conjunction with
+#   Deferred().
+#
+# @return
+#   Hash
+#
+# @example
+#   $data = Deferred('peadm::merge_ng_config_data', ['PE Master', $new_config_data])
+#
+Puppet::Functions.create_function(:'autope::merge_ng_config_data') do
+  dispatch :merge_ng_config_data do
+    param 'String', :group_name
+    param 'Hash', :new_config_data
+  end
+
+  def merge_ng_config_data(group_name, new_config_data)
+    require_libs
+    ensure_config
+
+    ng = Puppet::Util::Nc_https.new
+    group = ng.get_groups.select { |g| g['name'] == group_name }.first
+    group['config_data'].deep_merge(new_config_data)
+  rescue StandardError => e
+    Puppet.warn "Error attempting to read and merge node_group config data for #{group_name}: #{e.message}"
+    new_config_data
+  end
+
+  def require_libs
+    require 'deep_merge'
+
+    # We are using utilities from the node_manager module. Load 'em up, trying
+    # hard to get at them even if simple requires don't seem to be working.
+    begin
+      require 'puppet/util/nc_https'
+      require 'puppet_x/node_manager/common'
+    rescue LoadError
+      mod = Puppet::Module.find('node_manager', Puppet[:environment].to_s)
+      require File.join mod.path, 'lib/puppet/util/nc_https'
+      require File.join mod.path, 'lib/puppet_x/node_manager/common'
+    end
+  end
+
+  def ensure_config
+    # Because of failings in the node_manager module, we have to do some jerry
+    # rigging to ensure this will work when running over `bolt apply`.
+    return if File.exist?("#{Puppet.settings['confdir']}/node_manager.yaml") ||
+              !File.exist?('/etc/puppetlabs/puppet/classifier.yaml')
+
+    config = YAML.load_file('/etc/puppetlabs/puppet/classifier.yaml').first
+    config['port'] = 4433
+    config['hostcert'] = "/etc/puppetlabs/puppet/ssl/certs/#{config['server']}.pem"
+    config['hostprivkey'] = "/etc/puppetlabs/puppet/ssl/private_keys/#{config['server']}.pem"
+    config['localcacert'] = '/etc/puppetlabs/puppet/ssl/certs/ca.pem'
+    File.open("#{Puppet.settings['confdir']}/node_manager.yaml", 'w') { |f| f.write(config.to_yaml) }
+  end
+end

Diff for: manifests/setup/node_manager.pp

@@ -62,7 +62,9 @@
   # out-of-box configuration of the group.
   $compiler_pool_address_data = $compiler_pool_address ? {
     undef   => undef,
-    default => { 'pe_repo' => { 'compile_master_pool_address' => $compiler_pool_address } },
+    default => Deferred('peadm::merge_ng_config_data', ['PE Master',
+      { 'pe_repo' => { 'compile_master_pool_address' => $compiler_pool_address } }
+    ]),
   }
 
   node_group { 'PE Master':