Enable Sahara panel in Horizon

This change adds an option to deploy the data-processing panel
in Horizon.

Change-Id: I7f88dce5b9d1a82412ddb3ef18f3cc16de2140c3

defaults/main.yml

@@ -156,6 +156,9 @@ horizon_enable_ironic_ui: False
 ## Magnum UI Panel
 horizon_enable_magnum_ui: False
 
+## Sahara UI Panel
+horizon_enable_sahara_ui: False
+
 ## Neutron features to enable
 horizon_enable_neutron_lbaas: False
 horizon_enable_neutron_fwaas: False
@@ -243,6 +246,7 @@ horizon_pip_packages:
   - pycrypto
   - python-memcached
   - python-keystoneclient
+  - sahara_dashboard
 
 # This variable is used by the repo_build process to determine
 # which host group to check for members of before building the

releasenotes/notes/sahara-horizon-panel-d80d17da528b4c07.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    The Sahara dashboard is available in Horizon. Deployers can enable
+    the panel by setting the following Ansible variable:
+
+    .. code-block:: yaml
+
+        horizon_enable_sahara_ui: True

tasks/horizon_post_install.yml

@@ -57,6 +57,22 @@
   tags:
     - horizon-configs
 
+- name: Enable the sahara-dashboard Horizon panel
+  file:
+    src: "{{ item.src }}"
+    path: "{{ item.path }}"
+    state: "{{ horizon_enable_sahara_ui | ternary('link', 'absent') }}"
+  notify: Restart apache2
+  with_items:
+    - src: "{{ horizon_lib_dir }}/sahara_dashboard/enabled/_1810_data_processing_panel_group.py"
+      path: "{{ horizon_lib_dir }}/openstack_dashboard/enabled/_1810_data_processing_panel_group.py"
+    - src: "{{ horizon_lib_dir }}/sahara_dashboard/enabled/_1820_data_processing_clusters_panel.py"
+      path: "{{ horizon_lib_dir }}/openstack_dashboard/enabled/_1820_data_processing_clusters_panel.py"
+    - src: "{{ horizon_lib_dir }}/sahara_dashboard/enabled/_1840_data_processing_jobs_panel.py"
+      path: "{{ horizon_lib_dir }}/openstack_dashboard/enabled/_1840_data_processing_jobs_panel.py"
+  tags:
+    - horizon-configs
+
 - name: Enable the neutron-lbaas-dashboard Horizon panel
   file:
     src: "{{ horizon_lib_dir }}/neutron_lbaas_dashboard/enabled/_1481_project_ng_loadbalancersv2_panel.py"