add executors param to jenkins class

Similar semantics as `class { 'jenkins::slave': executors => ... }` but for
the Jenkins master.

manifests/init.pp

@@ -32,6 +32,9 @@
 # config_hash = undef (Default)
 #   Hash with config options to set in sysconfig/jenkins defaults/jenkins
 #
+# executors = undef (Default)
+#   Integer number of executors on the Jenkin's master.
+#
 # Example use
 #
 # class{ 'jenkins':
@@ -124,6 +127,7 @@
   $cli_try_sleep      = $jenkins::params::cli_try_sleep,
   $port               = $jenkins::params::port,
   $libdir             = $jenkins::params::libdir,
+  $executors          = undef,
 ) inherits jenkins::params {
 
   validate_bool($lts, $install_java, $repo)
@@ -137,6 +141,8 @@
     validate_array($no_proxy_list)
   }
 
+  validate_string($executors)
+
   anchor {'jenkins::begin':}
   anchor {'jenkins::end':}
 
@@ -177,6 +183,17 @@
     include jenkins::cli::reload
   }
 
+  if $executors {
+    jenkins::cli::exec { 'set_num_executors':
+      command => ['set_num_executors', $executors],
+      unless  => "[ \$(\$HELPER_CMD get_num_executors) -eq ${executors} ]"
+    }
+
+    Class['jenkins::cli'] ->
+      Jenkins::Cli::Exec['set_num_executors'] ->
+        Class['jenkins::jobs']
+  }
+
   Anchor['jenkins::begin'] ->
     Class['jenkins::package'] ->
       Class['jenkins::config'] ->

spec/acceptance/class_spec.rb

@@ -32,4 +32,33 @@ class {'jenkins':
     end
 
   end
-end
+
+  context 'executors' do
+    it 'should work with no errors' do
+      pp = <<-EOS
+      class {'jenkins':
+        executors => 42,
+      }
+      EOS
+
+      # Run it twice and test for idempotency
+      apply_manifest(pp, :catch_failures => true)
+      apply_manifest(pp, :catch_changes => true)
+    end
+
+    describe port(8080) do
+      # jenkins should already have been running so we shouldn't have to
+      # sleep
+      it { should be_listening }
+    end
+
+    describe service('jenkins') do
+      it { should be_running }
+      it { should be_enabled }
+    end
+
+    describe file('/var/lib/jenkins/config.xml') do
+      it { should contain '  <numExecutors>42</numExecutors>' }
+    end
+  end # executors
+end

spec/classes/jenkins_spec.rb

@@ -64,5 +64,34 @@
       let(:pre_condition) { 'define firewall ($action, $state, $dport, $proto) {}' }
       it { expect { should raise_error(Puppet::Error) } }
     end
+
+    describe 'executors =>' do
+      context 'undef' do
+        it { should_not contain_class('jenkins::cli_helper') }
+        it { should_not contain_jenkins__cli__exec('set_num_executors') }
+      end
+
+      context '42' do
+        let(:params) {{ :executors => 42 }}
+
+        it { should contain_class('jenkins::cli_helper') }
+        it do
+          should contain_jenkins__cli__exec('set_num_executors').with(
+            :command => ['set_num_executors', 42],
+            :unless  => '[ $($HELPER_CMD get_num_executors) -eq 42 ]',
+          )
+        end
+        it { should contain_jenkins__cli__exec('set_num_executors').that_requires('Class[jenkins::cli]') }
+        it { should contain_jenkins__cli__exec('set_num_executors').that_comes_before('Class[jenkins::jobs]') }
+      end
+
+      context '{}' do
+        let(:params) {{ :executors => {} }}
+
+        it 'should fail' do
+          should raise_error(Puppet::Error, /is not a string./)
+        end
+      end
+    end # executors =>
   end
 end