1 files changed, 46 insertions, 0 deletions
diff --git a/code/environments/production/modules/stdlib/lib/puppet/parser/functions/ensure_resource.rb b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/ensure_resource.rb
new file mode 100644
index 0000000..d28ed9d
--- /dev/null
+++ b/code/environments/production/modules/stdlib/lib/puppet/parser/functions/ensure_resource.rb
@@ -0,0 +1,46 @@
+# Test whether a given class or definition is defined
+require 'puppet/parser/functions'
+
+Puppet::Parser::Functions.newfunction(:ensure_resource,
+                                      :type => :statement,
+                                      :doc => <<-'DOC'
+    Takes a resource type, title, and a list of attributes that describe a
+    resource.
+
+        user { 'dan':
+          ensure => present,
+        }
+
+    This example only creates the resource if it does not already exist:
+
+        ensure_resource('user', 'dan', {'ensure' => 'present' })
+
+    If the resource already exists but does not match the specified parameters,
+    this function will attempt to recreate the resource leading to a duplicate
+    resource definition error.
+
+    An array of resources can also be passed in and each will be created with
+    the type and parameters specified if it doesn't already exist.
+
+        ensure_resource('user', ['dan','alex'], {'ensure' => 'present'})
+
+DOC
+                                     ) do |vals|
+  type, title, params = vals
+  raise(ArgumentError, 'Must specify a type') unless type
+  raise(ArgumentError, 'Must specify a title') unless title
+  params ||= {}
+
+  items = [title].flatten
+
+  items.each do |item|
+    Puppet::Parser::Functions.function(:defined_with_params)
+    if function_defined_with_params(["#{type}[#{item}]", params])
+      Puppet.debug("Resource #{type}[#{item}] with params #{params} not created because it already exists")
+    else
+      Puppet.debug("Create new resource #{type}[#{item}] with params #{params}")
+      Puppet::Parser::Functions.function(:create_resources)
+      function_create_resources([type.capitalize, { item => params }])
+    end
+  end
+end