Implement custom function to generate keystone-like ID

Generate a random 32 charaqcter hex string to use as
a keystone-like ID.

This is required for the glance image-cache for cinder
tenant and user IDs to be entered into cinder.conf

Change-Id: I5e12eef26b6f9e2dba28be870bee38dbd6ebf2c9

deployment_scripts/puppet/modules/plugin_purestorage_cinder/manifests/controller.pp

@@ -59,25 +59,36 @@ class plugin_purestorage_cinder::controller (
     }
 
 # Insert Glance Image Cache for Cinder settings
-    if $plugin_settings['image_volume_cache_enabled'] {
-        keystone_tenant { 'cinder_internal_tenant':
-                             ensure  => present,
-                             description => 'Cinder Internal Tenant',
-                             enabled => True,
-        }
-        keystone_user { 'cinder_internal_user':
-                             ensure  => present,
-                             description => 'Cinder Internal User',
-                             enabled => True,
-        }
-        keystone_role { 'admin':
-                             ensure => present,
-        }
-        keystone_user_role { 'cinder_internal_user@cinder_internal_tenant':
-                             roles => ['admin'],
-                             ensure => present
-        }
-# How do I get back the IDs.
+# Until we can do this correctly with Keystone and get back the created IDs
+# we will do this with the get_random_id below.
+#
+#    if $plugin_settings['image_volume_cache_enabled'] {
+#        keystone_tenant { 'cinder_internal_tenant':
+#                             ensure  => present,
+#                             description => 'Cinder Internal Tenant',
+#                             enabled => True,
+#        }
+#        keystone_user { 'cinder_internal_user':
+#                             ensure  => present,
+#                             description => 'Cinder Internal User',
+#                             enabled => True,
+#        }
+#        keystone_role { 'admin':
+#                             ensure => present,
+#        }
+#        keystone_user_role { 'cinder_internal_user@cinder_internal_tenant':
+#                             roles => ['admin'],
+#                             ensure => present
+#        }
+# 
+# Currently there is no way to recover a user or tenant ID from keystone in puppet.
+# Luckily the glance image cache doesn't actually use keystone to check the IDs so
+# we can just, temporarily, assign a randon ID to the two fields.
+# When keystone-puppet has the functionality we need we will fix this workaround
+
+      $PROJECT_ID"  = get_random_id(32)
+      $USER_ID"  = get_random_id(32)
+
        }
       cinder::backend::pure { DEFAULT :
         extra_options               => { "DEFAULT/cinder_internal_tenant_project_id" => { value => "$PROJECT_ID"] },

lib/puppet/parser/functions/get_random_id.rb

@@ -0,0 +1,17 @@
+# Customm function to generate a random hex string of length arg[0].
+#
+# This is used to ensure we get unique tenant and user IDs that
+# are required for the glance image-cache for cinder
+
+module Puppet::Parser::Functions
+  newfunction(:get_random_id, :type => :rvalue, :doc => "returns a random 32 character hex string") do |args|
+    raise(Puppet::ParseError, "get_random_id(): Wrong number of arguments " +
+      "given (#{args.size} for 1)") if args.size != 1
+    numbers  = (0..9).to_a
+    alpha = ('a'..'z').to_a
+    length = args[0]
+    CHARS = (alpha + numbers)
+    id = CHARS.sort_by { rand }.join[0...length]
+    return id
+  end
+end