(PDB-1430) overwritable java_args

this creates a new config setting, merge_default_java_args, that users may set
to false to override the default java_args.

README.md

@@ -377,6 +377,13 @@ Java VM options used for overriding default Java VM options specified in PuppetD
 
 Example: to set `-Xmx512m -Xms256m` options use `{ '-Xmx' => '512m', '-Xms' => '256m' }`
 
+####`merge_default_java_args`
+
+Sets whether the provided java args should be merged with the defaults, or
+should override the defaults. This setting is necessary if any of the defaults
+are to be removed. Defaults to true. If false, the `java_args` in the puppetdb
+init config file will reflect only what is passed via the `java_args` param.
+
 ####`max_threads`
 
 Jetty option to explicitly set max-thread. The default is undef, so the PuppetDB-jetty default is used.

lib/puppet/parser/functions/puppetdb_flatten_java_args.rb

@@ -0,0 +1,8 @@
+module Puppet::Parser::Functions
+  newfunction(:puppetdb_flatten_java_args, :type => :rvalue) do |args|
+    java_args = args[0] || {}
+    args = ""
+    java_args.each {|k,v| args += "#{k}#{v} "}
+    "\"#{args.chomp(' ')}\""
+  end
+end

manifests/init.pp

@@ -61,6 +61,7 @@ class puppetdb (
   $confdir                           = $puppetdb::params::confdir,
   $manage_firewall                   = $puppetdb::params::manage_firewall,
   $java_args                         = $puppetdb::params::java_args,
+  $merge_default_java_args           = $puppetdb::params::merge_default_java_args,
   $max_threads                       = $puppetdb::params::max_threads,
   $command_threads                   = $puppetdb::params::command_threads,
   $store_usage                       = $puppetdb::params::store_usage,
@@ -108,6 +109,7 @@ class puppetdb (
     puppetdb_service_status           => $puppetdb_service_status,
     confdir                           => $confdir,
     java_args                         => $java_args,
+    merge_default_java_args           => $merge_default_java_args,
     max_threads                       => $max_threads,
     read_database                     => $read_database,
     read_database_host                => $read_database_host,

manifests/params.pp

@@ -57,8 +57,9 @@ class puppetdb::params inherits puppetdb::globals {
   $read_conn_keep_alive              = '45'
   $read_conn_lifetime                = '0'
 
-  $manage_firewall = true
-  $java_args       = {}
+  $manage_firewall         = true
+  $java_args               = {}
+  $merge_default_java_args = true
 
   $puppetdb_package     = 'puppetdb'
   $puppetdb_service     = 'puppetdb'

manifests/server.pp

@@ -56,6 +56,7 @@ class puppetdb::server (
   $confdir                           = $puppetdb::params::confdir,
   $manage_firewall                   = $puppetdb::params::manage_firewall,
   $java_args                         = $puppetdb::params::java_args,
+  $merge_default_java_args           = $puppetdb::params::merge_default_java_args,
   $max_threads                       = $puppetdb::params::max_threads,
   $command_threads                   = $puppetdb::params::command_threads,
   $store_usage                       = $puppetdb::params::store_usage,
@@ -235,19 +236,30 @@ class puppetdb::server (
   }
 
   if !empty($java_args) {
-    create_resources(
-      'ini_subsetting',
-      puppetdb_create_subsetting_resource_hash(
-        $java_args,
-        { ensure  => present,
-          section => '',
-          key_val_separator => '=',
-          path => $puppetdb::params::puppetdb_initconf,
-          setting => 'JAVA_ARGS',
-          require => Package[$puppetdb_package],
-          notify => Service[$puppetdb_service],
-        })
-    )
+    if $merge_default_java_args {
+      create_resources(
+        'ini_subsetting',
+        puppetdb_create_subsetting_resource_hash(
+          $java_args,
+          {ensure  => present,
+           section => '',
+           key_val_separator => '=',
+           path => $puppetdb::params::puppetdb_initconf,
+           setting => 'JAVA_ARGS',
+           require => Package[$puppetdb_package],
+           notify => Service[$puppetdb_service],
+          }))
+    } else {
+      ini_setting {'java_args':
+        ensure => present,
+        section => '',
+        path => $puppetdb::params::puppetdb_initconf,
+        setting => 'JAVA_ARGS',
+        require => Package[$puppetdb_package],
+        notify => Service[$puppetdb_service],
+        value => puppetdb_flatten_java_args($java_args),
+      }
+    }
   }
 
   service { $puppetdb_service:

spec/unit/classes/server_spec.rb

@@ -44,5 +44,25 @@ describe 'puppetdb::server', :type => :class do
       end
 
     end
+
+    describe 'when specifying JAVA_ARGS with merge_default_java_args false' do
+      let (:params) do
+        {
+          'java_args' => {'-Xms' => '2g'},
+          'merge_default_java_args' => false,
+        }
+      end
+
+      context 'on standard PuppetDB' do
+        it { should contain_ini_setting('java_args').
+          with(
+            'ensure' => 'present',
+            'path' => '/etc/sysconfig/puppetdb',
+            'section' => '',
+            'setting' => 'JAVA_ARGS',
+            'value' => '"-Xms2g"'
+        )}
+      end
+    end
   end
 end