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-rw-r--r--lib/puppet/parser/functions/ensure_resource.rb35
1 files changed, 35 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/ensure_resource.rb b/lib/puppet/parser/functions/ensure_resource.rb
new file mode 100644
index 0000000..fba2035
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+++ b/lib/puppet/parser/functions/ensure_resource.rb
@@ -0,0 +1,35 @@
+# Test whether a given class or definition is defined
+require 'puppet/parser/functions'
+
+Puppet::Parser::Functions.newfunction(:ensure_resource,
+ :type => :statement,
+ :doc => <<-'ENDOFDOC'
+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.
+
+ENDOFDOC
+) do |vals|
+ type, title, params = vals
+ raise(ArgumentError, 'Must specify a type') unless type
+ raise(ArgumentError, 'Must specify a title') unless title
+ params ||= {}
+ Puppet::Parser::Functions.function(:defined_with_params)
+ if function_defined_with_params(["#{type}[#{title}]", params])
+ Puppet.debug("Resource #{type}[#{title}] not created b/c it already exists")
+ else
+ Puppet::Parser::Functions.function(:create_resources)
+ function_create_resources([type.capitalize, { title => params }])
+ end
+end