manage configuration snippets in a conf.d directory

this should make it easier to override values from my.cnf, or to set
other values that aren't in the main config file.

manifests/conf.pp

@@ -0,0 +1,36 @@
+# $config needs to be a hash of key => value pairs.
+#
+# values in config are output as key = value, except when the value is empty;
+# then just key is output. if you need to output an empty value in the form
+# key = value, then you can specify empty quotes as the value (see example).
+#
+# mysql::conf { 'test':
+#   ensure  => present,
+#   section => 'mysqld',
+#   config  => {
+#     table_cache => '15000',
+#     skip_slave  => '',
+#     something   => '""',
+#   }
+# }
+#
+# This will generate the following contents:
+# [mysqld]
+# skip_slave
+# something = ""
+# table_cache = 15000
+#
+define mysql::conf (
+  $section,
+  $config,
+  $ensure = present
+) {
+
+  include mysql::server::base
+
+  file { "/etc/mysql/conf.d/${name}.cnf":
+    ensure   => $ensure,
+    content  => template('mysql/conf.erb'),
+  }
+
+}

manifests/server/base.pp

@@ -88,4 +88,12 @@ class mysql::server::base {
     Mysql_user<<| tag == "mysql_${::fqdn}"  |>>
     Mysql_grant<<| tag == "mysql_${::fqdn}" |>>
   }
+
+  file { '/etc/mysql/conf.d':
+    ensure => directory,
+    owner  => 'root',
+    group  => 0,
+    mode   => '0755',
+  }
+
 }

templates/conf.erb

@@ -0,0 +1,9 @@
+# THIS FILE IS MANAGED BY PUPPET
+[<%= @section -%>]
+<% @config.each do |key, value| -%>
+<% if value != '' -%>
+<%= key -%> = <%= value %>
+<% else -%>
+<%= key %>
+<% end -%>
+<% end %>