Add support for DEFAULT_BOOT_SOURCE

Change-Id: I1d77d7076f845e2fc47a4132eabe442091a63374

manifests/init.pp

@@ -509,6 +509,11 @@
 #     will disable the function in Horizon, direct will allow the user agent to directly
 #     talk to the glance-api.
 #
+#  [*default_boot_source*]
+#    (optional) A default instance boot source. Allowed values are: "image",
+#    "snapshot", "volume" and "volume_snapshot".
+#    Defaults to undef
+#
 # DEPRECATED PARAMETERS
 #
 #  [*enable_user_pass*]
@@ -620,6 +625,7 @@ class horizon(
   $password_validator_help             = undef,
   $customization_module                = undef,
   $horizon_upload_mode                 = undef,
+  $default_boot_source                 = undef,
   # DEPRECATED PARAMETERS
   $enable_user_pass                    = undef,
 ) inherits horizon::params {

releasenotes/notes/default_boot_source-8c7b960d1213fdcf.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    The new ``horizon::default_boot_source`` parameter has been added.

templates/local_settings.py.erb

@@ -1030,3 +1030,10 @@ DISALLOW_IFRAME_EMBED = <%= @disallow_iframe_embed.to_s.capitalize %>
 <% if @horizon_upload_mode_real -%>
 HORIZON_IMAGES_UPLOAD_MODE = "<%= @horizon_upload_mode_real %>"
 <%- end -%>
+
+# A default instance boot source. Allowed values are: "image", "snapshot",
+# "volume" and "volume_snapshot"
+#DEFAULT_BOOT_SOURCE = "image"
+<% if @default_boot_source -%>
+DEFAULT_BOOT_SOURCE = "<%= @default_boot_source %>"
+<%- end -%>