Add ensure_resources() function

New function "ensure_resources()" to support passing hash as parameter OR from hiera backend

This new function is extension of ensure_resource() which will now support to pass multiple values as hash/array OR from hiera backend variables in title argument with additional parameters needed.

It will
process multiple values for a resource type from the passed argument & pass each entry (type, title, params) to ensure_resource() in required format for further processing.
Now user can have duplicate resource check functionality extended to multiple entries with this new function.

Use:
For multiple resources using
hash:
ensure_resources('user', {'dan' => { gid => 'mygroup', uid =>'600' } ,  'alex' => { gid => 'mygroup' }}, {'ensure' =>'present'})

From Hiera Backend:

userlist:
  dan:
    gid: 'mygroup'

uid: '600'
  alex:
 gid: 'mygroup'

Call:
ensure_resources('user',hiera_hash('userlist'), {'ensure' => 'present'})

ensure_packages()
Modified to also support Hash type argument for packages

This modification will call newly added ensure_resources() for processing Hash as second argument.
The original functionality remains same for Array type arguments.

Use:
hiera:

packagelist:
  ksh:
    ensure: latest
  mlocate: {}
  myrpm:
    provider: rpm
    source: "/tmp/myrpm-1.0.0.x86_64.rpm"
    install_options:
      --prefix:
        /users/home
  openssl:
    provider: rpm
    source: "/tmp/openssl-1.0.1e-42.el7.x86_64.rpm"

Call:
ensure_packages($packagelist)

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/ensure_resources.rb b/lib/puppet/parser/functions/ensure_resources.rb
new file mode 100644
index 0000000..30d57a8
--- /dev/null
+++ b/lib/puppet/parser/functions/ensure_resources.rb
@@ -0,0 +1,54 @@
+require 'puppet/parser/functions'
+
+Puppet::Parser::Functions.newfunction(:ensure_resources,
+                                      :type => :statement,
+                                      :doc => <<-'ENDOFDOC'
+Takes a resource type, title (only hash), and a list of attributes that describe a
+resource.
+
+    user { 'dan':
+      gid => 'mygroup',
+      ensure => present,
+    }
+
+An hash of resources should be passed in and each will be created with
+the type and parameters specified if it doesn't already exist.
+
+    ensure_resources('user', {'dan' => { gid => 'mygroup', uid => '600' } ,  'alex' => { gid => 'mygroup' }}, {'ensure' => 'present'})
+
+From Hiera Backend:
+
+userlist:
+  dan:
+    gid: 'mygroup'
+ uid: '600'
+  alex:
+ gid: 'mygroup'
+
+Call:
+ensure_resources('user', hiera_hash('userlist'), {'ensure' => 'present'})
+
+ENDOFDOC
+) do |vals|
+  type, title, params = vals
+  raise(ArgumentError, 'Must specify a type') unless type
+  raise(ArgumentError, 'Must specify a title') unless title
+  params ||= {}
+
+  if title.is_a?(Hash)
+    resource_hash = Hash(title)
+    resources = resource_hash.keys
+
+    Puppet::Parser::Functions.function(:ensure_resource)
+    resources.each { |resource_name|
+    if resource_hash[resource_name]
+        params_merged = params.merge(resource_hash[resource_name])
+    else
+        params_merged = params
+    end
+    function_ensure_resource([ type, resource_name, params_merged ])
+    }
+  else
+       raise(Puppet::ParseError, 'ensure_resources(): Requires second argument to be a Hash')
+  end
+end