MongoDB installation as part of Tower.

awx/api/management/commands/uses_mongo.py

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+# Copyright (c) 2015 Ansible, Inc.
+# All Rights Reserved
+
+import sys
+
+from django.core.management.base import BaseCommand
+
+from awx.main.task_engine import TaskSerializer
+
+
+class Command(BaseCommand):
+    """Return a exit status of 0 if MongoDB should be active, and an
+    exit status of 1 otherwise.
+
+    This script is intended to be used by bash and init scripts to
+    conditionally start MongoDB, so its focus is on being bash-friendly.
+    """
+    def handle(self, **kwargs):
+        # Get the license data.
+        license_reader = TaskSerializer()
+        license_data = license_reader.from_file()
+
+        # Does the license contain the system tracking feature?
+        # If and only if it does, MongoDB should run.
+        system_tracking = license_data['features']['system_tracking']
+
+        # Okay, do we need MongoDB to be turned on?
+        # This is a silly variable assignment right now, but I expect the
+        # rules here will grow more complicated over time.
+        # FIXME: Most likely this should be False if HA is active
+        #        (not just enabled by license, but actually in use).
+        uses_mongo = system_tracking
+
+        # If we do not need Mongo, return a non-zero exit status.
+        print('MongoDB NOT required')
+        sys.exit(1)
+
+        # We do need Mongo, return zero.
+        print('MongoDB required')
+        sys.exit(0)