custom variables

• Injecting custom variables from the cli with --custom-variable KEY=VALUE (can be specify multiple times) or from the env description with the "custom_variables" hash or in the cluster configuration with the hash of the same name.
• The custom variables are accessible in kadeploy scripts by prefixing them by "KADEPLOY_". (eg: KADEPLOY_DEBUG)
• The name of the variable and the value must be a string.
• Priority of variables: CLI > env description > cluster configuration. A warning appears when a custom variable is overwrite. (eg: "Custom Variables from the environement overwrite by the client: DEBUG.")
• Some name are reserved by kadeploy and can't be overwrite. An error is thrown when trying to name a custom variable with such name from the CLI. (eg: "You cannot overwrite Kadeploy variables: CLUSTER.")

TODO:

• Ajouter l'option dans kareboot (et kapower?)
• Meilleur gestion de l'erreur où la variable existe déjà
• Mieux traiter les inputs (pour l'instant je vérifie juste que c'est un hash, mais il faut veriier que c'est un hash que d'une profondeur et avec que des strings ?)

bin/kadeploy3

@@ -45,6 +45,7 @@ class KadeployClient < ClientWorkflow
         :reboot_classical_timeout => nil,
         :reboot_kexec_timeout => nil,
         :vlan => nil,
+        :custom_variables => {},
         :secure => false,
       }
     )
@@ -72,8 +73,10 @@ class KadeployClient < ClientWorkflow
       parse_pxe_profile(opt, options)
       parse_pxe_pattern(opt, options)
       parse_pxe_files(opt, options)
+      parse_custom_variables(opt, options)
       parse_env_version(opt, options)
       parse_env_arch(opt, options)
+
       opt.separator ""
       opt.separator "Advanced options:"
       add_opt(opt, "--no-kexec", "Disable kexec from the deployment kernel to the deployed environment") {
@@ -135,7 +138,11 @@ class KadeployClient < ClientWorkflow
     params[:environment] = {
       :kind => options[:env_kind],
     }
-
+    unless options[:custom_variables].empty?
+      server_env_vars = get2(options, '/info')['vars']
+      incorrect_custom_variables = options[:custom_variables].keys & server_env_vars.map{|x| x.gsub(/^KADEPLOY_/,'') }
+      error("You cannot overwrite Kadeploy variables: #{incorrect_custom_variables.join(', ')}.") unless incorrect_custom_variables.empty?
+    end
     params[:deploy_partition] = options[:deploy_part] if options[:deploy_part]
     params[:block_device] = options[:block_device] if options[:block_device]
     params[:boot_partition] = options[:boot_part] if options[:boot_part]
@@ -147,6 +154,7 @@ class KadeployClient < ClientWorkflow
     params[:always_trust_env] = options[:always_trust_env] if options[:always_trust_env]
     params[:disable_bootloader_install] = options[:disable_bootloader_install] if options[:disable_bootloader_install]
     params[:disable_disk_partitioning] = options[:disable_disk_partitioning] if options[:disable_disk_partitioning]
+    params[:custom_variables] = options[:custom_variables]
     if options[:pxe_profile]
       params[:pxe] = {}
       params[:pxe][:profile] = options[:pxe_profile]