1 files changed, 24 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/ensure_packages.rb b/lib/puppet/parser/functions/ensure_packages.rb
new file mode 100644
index 0000000..450ea02
--- /dev/null
+++ b/lib/puppet/parser/functions/ensure_packages.rb
@@ -0,0 +1,24 @@
+#
+# ensure_packages.rb
+#
+require 'puppet/parser/functions'
+
+module Puppet::Parser::Functions
+  newfunction(:ensure_packages, :type => :statement, :doc => <<-EOS
+Takes a list of packages and only installs them if they don't already exist.
+    EOS
+  ) do |arguments|
+
+    raise(Puppet::ParseError, "ensure_packages(): Wrong number of arguments " +
+      "given (#{arguments.size} for 1)") if arguments.size != 1
+    raise(Puppet::ParseError, "ensure_packages(): Requires array " +
+      "given (#{arguments[0].class})") if !arguments[0].kind_of?(Array)
+
+    Puppet::Parser::Functions.function(:ensure_resource)
+    arguments[0].each { |package_name|
+      function_ensure_resource(['package', package_name, {'ensure' => 'present' } ])
+    }
+  end
+end
+
+# vim: set ts=2 sw=2 et :