Support COMPRESS_ROOT option

Change-Id: I037f1ecd857981b5dc6b4162007480484c48f681

manifests/init.pp

@@ -183,6 +183,11 @@
 #    (optional) Boolean to enable offline compress of assets.
 #    Defaults to True
 #
+#  [*compress_root*]
+#    (optional) Absolute file path that linked static will be read from and
+#    compressed static will be written to
+#    Defaults to undef
+#
 #  [*hypervisor_options*]
 #    (optional) A hash of parameters to enable features specific to
 #    Hypervisors.
@@ -606,6 +611,7 @@ class horizon(
   $wsgi_threads                                     = '1',
   Boolean $compress_enabled                         = true,
   Boolean $compress_offline                         = true,
+  Optional[Stdlib::Absolutepath] $compress_root     = undef,
   # TODO(tkajinam) Consider adding more strict validation about key-value
   Hash $hypervisor_options                          = {},
   Hash $cinder_options                              = {},

releasenotes/notes/compress_root-0a77ff2912d85a57.yaml

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

spec/classes/horizon_init_spec.rb

@@ -114,6 +114,7 @@ describe 'horizon' do
           :dropdown_max_items               => 123,
           :compress_enabled                 => false,
           :compress_offline                 => false,
+          :compress_root                    => '/tmp',
           :hypervisor_options               => {'can_set_mount_point' => false, 'can_set_password' => true },
           :cinder_options                   => {'enable_backup' => true },
           :keystone_options                 => {'name' => 'native', 'can_edit_user' => true, 'can_edit_group' => true, 'can_edit_project' => true, 'can_edit_domain' => false, 'can_edit_role' => false},
@@ -223,6 +224,7 @@ describe 'horizon' do
           'TOKEN_TIMEOUT_MARGIN = 60',
           'COMPRESS_ENABLED = False',
           'COMPRESS_OFFLINE = False',
+          "COMPRESS_ROOT = '/tmp'",
           "FILE_UPLOAD_TEMP_DIR = '/var/spool/horizon'",
           'OVERVIEW_DAYS_RANGE = 1',
           'DISALLOW_IFRAME_EMBED = True',

templates/local_settings.py.erb

@@ -1066,6 +1066,13 @@ COMPRESS_ENABLED = <%= @compress_enabled.to_s.capitalize %>
 # the python-lesscpy package and disable the following option.
 COMPRESS_OFFLINE = <%= @compress_offline.to_s.capitalize %>
 
+# Controls the absolute file path that linked static will be read from and
+# compressed static will be written to
+# COMPRESS_ROOT = STATIC_ROOT
+<% if ! @compress_root.nil? -%>
+COMPRESS_ROOT = '<%= @compress_root %>'
+<% end -%>
+
 # For Glance image upload, Horizon uses the file upload support from Django
 # so we add this option to change the directory where uploaded files are temporarily
 # stored until they are loaded into Glance.