Added jenkins_prefix function to retrieve configured prefix

lib/puppet/parser/functions/jenkins_prefix.rb

@@ -0,0 +1,21 @@
+
+module Puppet::Parser::Functions
+  newfunction(:jenkins_prefix, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
+    Return the configured Jenkins prefix value
+    (corresponds to /etc/defaults/jenkins -> PREFIX)
+
+    Example:
+
+        $prefix = jenkins_prefix()
+    ENDHEREDOC
+
+    config_hash = lookupvar('::jenkins::config_hash')
+    if config_hash && \
+      config_hash['PREFIX'] && \
+      config_hash['PREFIX']['value']
+      return config_hash['PREFIX']['value']
+    else
+      return lookupvar('::jenkins::params::prefix')
+    end
+  end
+end

manifests/cli.pp

@@ -41,6 +41,7 @@
   }
 
   $port = jenkins_port()
+  $prefix = jenkins_prefix()
 
   # Provide the -i flag if specified by the user.
   if $::jenkins::cli_ssh_keyfile {
@@ -54,7 +55,7 @@
     delete_undef_values([
       'java',
       "-jar ${::jenkins::cli::jar}",
-      "-s http://localhost:${port}",
+      "-s http://localhost:${port}${prefix}",
       $auth_arg,
     ]),
     ' '

manifests/cli_helper.pp

@@ -15,6 +15,7 @@
   $libdir = $::jenkins::libdir
   $cli_jar = $::jenkins::cli::jar
   $port = jenkins_port()
+  $prefix = jenkins_prefix()
 
   $helper_groovy = "${libdir}/puppet_helper.groovy"
   file {$helper_groovy:
@@ -34,7 +35,7 @@
     delete_undef_values([
       '/usr/bin/java',
       "-jar ${::jenkins::cli::jar}",
-      "-s http://127.0.0.1:${port}",
+      "-s http://127.0.0.1:${port}${prefix}",
       $auth_arg,
       "groovy ${helper_groovy}",
     ]),

manifests/params.pp

@@ -11,6 +11,7 @@
   $swarm_version         = '1.22'
   $default_plugins_host  = 'https://updates.jenkins-ci.org'
   $port                  = '8080'
+  $prefix                = ''
   $cli_tries             = 10
   $cli_try_sleep         = 10
   $package_cache_dir     = '/var/cache/jenkins_pkgs'

spec/functions/jenkins_prefix_spec.rb

@@ -0,0 +1,35 @@
+require 'spec_helper'
+
+# Skip this example block under puppet-4 as it will fail with rspec-puppet
+# 2.1.0.
+#
+# https://github.com/rodjek/rspec-puppet/issues/282
+describe 'jenkins_prefix', :if => Puppet.version.to_f < 4.0 do
+
+  let(:facts) { { :osfamily => 'RedHat', :operatingsystem => 'RedHat' } }
+  let(:pre_condition) { 'include ::jenkins' }
+  # Lazily loaded function call to be used in examples. Not overwriting
+  # `subject` since rspec-puppet is already defining that to return the
+  # function
+  let(:prefix) {
+    subject.call([])
+  }
+
+  it 'should default to ""' do
+    expect(prefix).to eql ''
+  end
+
+  context 'with overwritten configuration' do
+    let(:pre_condition) do
+      <<-ENDPUPPET
+      class { 'jenkins':
+        config_hash => {'PREFIX' => {'value' => '/test'}},
+      }
+      ENDPUPPET
+    end
+
+    it 'should be our overwritten prefix' do
+      expect(prefix).to eql('/test')
+    end
+  end
+end