Let the common web user write to course data.

This is beacuse of hardcoded brokenness in how we deal with xml courses
right now.  The course has JS that is compiled when common.py is loaded
and relies on the DATA_DIR(course_data_dir) being in a specific relative
location to the edx-platform code dir.

playbooks/roles/edxapp/defaults/main.yml

@@ -308,6 +308,10 @@ edxapp_upload_dir: "{{ edxapp_data_dir }}/uploads"
 edxapp_theme_dir: "{{ edxapp_data_dir }}/themes"
 edxapp_git_identity: "{{ edxapp_app_dir }}/edxapp-git-identity"
 edxapp_git_ssh: "/tmp/edxapp_git_ssh.sh"
+
+# TODO: This can be removed once VPC-122 is resolved
+edxapp_legacy_course_data_dir: "{{ edxapp_app_dir }}/data"
+
 edxapp_workers:
   - queue: low
     service_variant: cms

playbooks/roles/edxapp/tasks/deploy.yml

@@ -388,6 +388,18 @@
     chdir="{{ edxapp_data_dir }}"
   when: download_xml_s3.changed
 
+# This currently has to be done because
+# the course coffescript is compiled on the fly
+# by the application after startup.
+# See VPC-117 and VPC-122
+- name: make the course data web user writable
+  file:
+    path="{{ edxapp_course_data_dir }}"
+    state=directory
+    recurse=yes
+    owner="{{ common_web_user }}"
+    group="{{ edxapp_user }}"
+
 # creates the supervisor jobs for the
 # service variants configured, runs
 # gather_assets and db migrations

playbooks/roles/edxapp/tasks/main.yml

@@ -27,6 +27,19 @@
     - "{{ edxapp_staticfile_dir }}"
     - "{{ edxapp_course_static_dir }}"
 
+# This is a symlink that has to exist because
+# we currently can't override the DATA_DIR var
+# in edx-platform. TODO: This can be removed once
+# VPC-122 is closed
+- name: make the course data dir
+  file:
+    src="{{ edxapp_course_data_dir }}"
+    dest="{{ edxapp_legacy_course_data_dir }}"
+    state=link
+    owner="{{ edxapp_user }}"
+    group="{{ common_web_group }}"
+    
+
 - name: create edxapp log dir
   file: >
     path="{{ edxapp_log_dir }}" state=directory