Introduce node and group level vars

Variables can now be fed to model from multiple locations. In order of
preference:

1) node (from source)
2) group
3) global

In a model vars should be accessed via 'vars' helper method though it is
not required. Helper method ignores nil values so care needs to taken
when designing model behaviour.

Support for node level vars is currently available on sql source via
'vars_map' configuration.

Following example populates node vars 'enable' and 'somevariable' from sql
columns 'var_enable' and 'var_somevariable'

   sql:
     adapter: sqlite
     file: /home/aakso/.config/oxidized/sqrouter.db
     table: nodes
     map:
       name: hostname
       model: model
       group: node_group
       username: username
       password: password
     vars_map:
       enable: var_enablepw
       somevariable: var_somevariable

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/oxidized/config.rb b/lib/oxidized/config.rb
index 9e5ec60..fd120b6 100644
--- a/lib/oxidized/config.rb
+++ b/lib/oxidized/config.rb
@@ -9,6 +9,17 @@ module Oxidized
     ModelDir  = File.join Directory, %w(lib oxidized model)
     SourceDir = File.join Directory, %w(lib oxidized source)
     Sleep     = 1
+
+    module Vars
+      # convenience method for accessing node, group or global level user variables
+      # nil values will be ignored
+      def vars name
+        r =   @node.vars[name]
+        r ||= CFG.groups[@node.group].vars[name.to_s] if CFG.groups.has_key?(@node.group)
+        r ||= CFG.vars[name.to_s]
+      end
+    end
+
   end
   class << self
     attr_accessor :mgr
@@ -25,6 +36,7 @@ module Oxidized
   CFGS.default.prompt        = /^([\w.@-]+[#>]\s?)$/
   CFGS.default.rest          = '0.0.0.0:8888' # or false to disable
   CFGS.default.vars          = {}             # could be 'enable'=>'enablePW'
+  CFGS.default.groups        = {}             # group level configuration
   CFGS.default.remove_secret = false          # runs cmd(:secret) blocks if true
 
   CFGS.default.input.default = 'ssh, telnet'