add puppet stdlib

[dsa-puppet.git] / modules / stdlib / lib / puppet / parser / functions / getvar.rb

diff --git a/modules/stdlib/lib/puppet/parser/functions/getvar.rb b/modules/stdlib/lib/puppet/parser/functions/getvar.rb
new file mode 100644 (file)
index 0000000..1621149
--- /dev/null
+++ b/modules/stdlib/lib/puppet/parser/functions/getvar.rb
@@ -0,0 +1,26 @@
+module Puppet::Parser::Functions
+
+  newfunction(:getvar, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
+    Lookup a variable in a remote namespace.
+
+    For example:
+
+        $foo = getvar('site::data::foo')
+        # Equivalent to $foo = $site::data::foo
+
+    This is useful if the namespace itself is stored in a string:
+
+        $datalocation = 'site::data'
+        $bar = getvar("${datalocation}::bar")
+        # Equivalent to $bar = $site::data::bar
+    ENDHEREDOC
+
+    unless args.length == 1
+      raise Puppet::ParseError, ("getvar(): wrong number of arguments (#{args.length}; must be 1)")
+    end
+
+    self.lookupvar("#{args[0]}")
+
+  end
+
+end