catch duplicate course error

cms/djangoapps/contentstore/management/commands/create_course.py

@@ -10,6 +10,7 @@ from django.core.management.base import BaseCommand, CommandError
 from contentstore.management.commands.utils import user_from_str
 from contentstore.views.course import create_new_course_in_store
 from xmodule.modulestore import ModuleStoreEnum
+from xmodule.modulestore.exceptions import DuplicateCourseError
 
 
 MODULESTORE_CHOICES = (ModuleStoreEnum.Type.mongo, ModuleStoreEnum.Type.split)
@@ -75,12 +76,16 @@ class Command(BaseCommand):
         }
         if name:
             fields["display_name"] = name
-        new_course = create_new_course_in_store(
-            storetype,
-            user,
-            org,
-            number,
-            run,
-            fields
-        )
-        self.stdout.write(u"Created {}".format(text_type(new_course.id)))
+
+        try:
+            new_course = create_new_course_in_store(
+                storetype,
+                user,
+                org,
+                number,
+                run,
+                fields
+            )
+            self.stdout.write(u"Created {}".format(text_type(new_course.id)))
+        except DuplicateCourseError:
+            self.stdout.write(u"Course already exists")

cms/djangoapps/contentstore/management/commands/tests/test_create_course.py

 """
 Unittests for creating a course in an chosen modulestore
 """
+from StringIO import StringIO
 import ddt
 from django.core.management import CommandError, call_command
 from django.test import TestCase
@@ -59,6 +60,29 @@ class TestCreateCourse(ModuleStoreTestCase):
         # pylint: disable=protected-access
         self.assertEqual(store, modulestore()._get_modulestore_for_courselike(new_key).get_modulestore_type())
 
+    def test_duplicate_course(self):
+        """
+        Test that creating a duplicate course exception is properly handled
+        """
+        call_command(
+            "create_course",
+            "split",
+            str(self.user.email),
+            "org", "course", "run", "dummy-course-name"
+        )
+
+        # create the course again
+        out = StringIO()
+        call_command(
+            "create_course",
+            "split",
+            str(self.user.email),
+            "org", "course", "run", "dummy-course-name",
+            stderr=out
+        )
+        expected = u"Course already exists"
+        self.assertIn(out.getvalue().strip(), expected)
+
     @ddt.data(ModuleStoreEnum.Type.split, ModuleStoreEnum.Type.mongo)
     def test_get_course_with_different_case(self, default_store):
         """