Customize jenkins.default by template

Turn jenkins.default to a template. This enables to customize it
easily. This is useful for downstream projects where it is needed
to tune jenkins.default parameters. Either Pass the required
parameter to jenkins class or pass a customized jenkins.default
file location in jenkins_default.
For backward compatibility, default values are set in the class
parameters list.

Change-Id: Ice0e4ffa2fffd041d8bcc4a0b323ffae7ba2b0c8

manifests/master.pp

@@ -1,5 +1,15 @@
 # == Class: jenkins::master
 #
+# This class will install and configure Jenkins master
+#
+# === Parameters
+#
+# [*jenkins_default*]
+#   (Optional) Puppet source from which to initialize /etc/defaults/jenkins.
+#   E.g. 'puppet:///modules/<yourmodule/jenkins.default'. If specified,
+#   java_args_override, run_standalone, max_open_files, and http_port are
+#   ignored.
+
 class jenkins::master(
   $logo = '',
   $vhost_name = $::fqdn,
@@ -12,9 +22,13 @@ class jenkins::master(
   $ssl_chain_file_contents = '', # If left empty puppet will not create file.
   $jenkins_ssh_private_key = '',
   $jenkins_ssh_public_key = '',
-  $jenkins_default = 'puppet:///modules/jenkins/jenkins.default',
+  $jenkins_default = undef,
   $jenkins_version = 'present',
+  $java_args_override = undef,
   $jenkins_deb_url_base = 'http://pkg.jenkins.io/debian/binary',
+  $run_standalone = true,
+  $max_open_files = 8192,
+  $http_port = 8080,
 ) {
   include ::pip
   include ::apt
@@ -156,12 +170,27 @@ class jenkins::master(
     command     => 'apt-get update',
   }
 
-  file { '/etc/default/jenkins':
-    ensure => present,
-    owner  => 'root',
-    group  => 'root',
-    mode   => '0644',
-    source => $jenkins_default,
+  # Template uses:
+  # - $java_args_override
+  # - $run_standalone
+  # - $max_open_files
+  # - $http_port
+  if ! $jenkins_default {
+    file { '/etc/default/jenkins':
+      ensure  => present,
+      owner   => 'root',
+      group   => 'root',
+      mode    => '0644',
+      content => template('jenkins/jenkins.default.erb'),
+    }
+  } else {
+    file { '/etc/default/jenkins':
+      ensure => present,
+      owner  => 'root',
+      group  => 'root',
+      mode   => '0644',
+      source => $jenkins_default
+    }
   }
 
   file { '/var/lib/jenkins':

templates/jenkins.default.erb

@@ -11,7 +11,11 @@ JAVA=/usr/bin/java
 #JAVA_ARGS="-Djava.net.preferIPv4Stack=true" # make jenkins listen on IPv4 address
 # Disable compression as zip deflation threads eat CPU time.
 # https://issues.jenkins-ci.org/browse/JENKINS-14362
+<% if @java_args_override -%>
+JAVA_ARGS="<%= @java_args_override %>"
+<% else -%>
 JAVA_ARGS="-Xloggc:/var/log/jenkins/gc.log -XX:+PrintGCDetails -Xmx12g -Dorg.kohsuke.stapler.compression.CompressionFilter.disabled=true -Djava.util.logging.config.file=/var/lib/jenkins/logger.conf"
+<% end -%>
 
 PIDFILE=/var/run/jenkins/jenkins.pid
 
@@ -27,7 +31,7 @@ JENKINS_HOME=/var/lib/jenkins
 # set this to false if you don't want Hudson to run by itself
 # in this set up, you are expected to provide a servlet container
 # to host jenkins.
-RUN_STANDALONE=true
+RUN_STANDALONE=<%= @run_standalone %>
 
 # log location.  this may be a syslog facility.priority
 JENKINS_LOG=/var/log/jenkins/$NAME.log
@@ -38,10 +42,10 @@ JENKINS_LOG=/var/log/jenkins/$NAME.log
 #   this is on by default because http://github.com/jenkinsci/jenkins/commit/2fb288474e980d0e7ff9c4a3b768874835a3e92e
 #   reported that Ubuntu's PAM configuration doesn't include pam_limits.so, and as a result the # of file
 #   descriptors are forced to 1024 regardless of /etc/security/limits.conf
-MAXOPENFILES=8192
+MAXOPENFILES=<%= @max_open_files %>
 
 # port for HTTP connector (default 8080; disable with -1)
-HTTP_PORT=8080
+HTTP_PORT=<%= @http_port %>
 
 # port for AJP connector (disabled by default)
 AJP_PORT=-1