Move the resources_fs abstraction into the primary DescriptorSystem, as it is...

Move the resources_fs abstraction into the primary DescriptorSystem, as it is needed for more than just XMLParsing

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

@@ -31,26 +31,25 @@ class Command(BaseCommand):
 
             class ImportSystem(XMLParsingSystem):
                 def __init__(self):
-                    self.load_item = keystore().get_item
-                    self.fs = OSFS(data_dir)
-
-                def process_xml(self, xml):
-                    try:
-                        xml_data = etree.fromstring(xml)
-                    except:
-                        raise CommandError("Unable to parse xml: " + xml)
-
-                    if not xml_data.get('name'):
-                        global unnamed_modules
-                        unnamed_modules += 1
-                        xml_data.set('name', '{tag}_{count}'.format(tag=xml_data.tag, count=unnamed_modules))
-
-                    module = XModuleDescriptor.load_from_xml(etree.tostring(xml_data), self, org, course, RawDescriptor)
-                    keystore().create_item(module.url)
-                    if 'data' in module.definition:
-                        keystore().update_item(module.url, module.definition['data'])
-                    if 'children' in module.definition:
-                        keystore().update_children(module.url, module.definition['children'])
-                    return module
+                    def process_xml(xml):
+                        try:
+                            xml_data = etree.fromstring(xml)
+                        except:
+                            raise CommandError("Unable to parse xml: " + xml)
+
+                        if not xml_data.get('name'):
+                            global unnamed_modules
+                            unnamed_modules += 1
+                            xml_data.set('name', '{tag}_{count}'.format(tag=xml_data.tag, count=unnamed_modules))
+
+                        module = XModuleDescriptor.load_from_xml(etree.tostring(xml_data), self, org, course, RawDescriptor)
+                        keystore().create_item(module.url)
+                        if 'data' in module.definition:
+                            keystore().update_item(module.url, module.definition['data'])
+                        if 'children' in module.definition:
+                            keystore().update_children(module.url, module.definition['children'])
+                        return module
+
+                    XMLParsingSystem.__init__(self, keystore().get_item, OSFS(data_dir), process_xml)
 
             ImportSystem().process_xml(course_file.read())

common/lib/keystore/mongo.py

@@ -51,8 +51,9 @@ class MongoModuleStore(ModuleStore):
         if item is None:
             raise ItemNotFoundError(location)
 
+        # TODO (cpennington): Pass a proper resources_fs to the system
         return XModuleDescriptor.load_from_json(
-            item, DescriptorSystem(self.get_item), self.default_class)
+            item, DescriptorSystem(self.get_item, None), self.default_class)
 
     def create_item(self, location):
         """

common/lib/xmodule/translation_module.py

@@ -23,7 +23,7 @@ def process_includes(fn):
             file = next_include.get('file')
             if file is not None:
                 try:
-                    ifp = system.fs.open(file)
+                    ifp = system.resources_fs.open(file)
                 except Exception:
                     log.exception('Error in problem xml include: %s' % (etree.tostring(next_include, pretty_print=True)))
                     log.exception('Cannot find file %s in %s' % (file, dir))

common/lib/xmodule/x_module.py

@@ -331,20 +331,21 @@ class XModuleDescriptor(Plugin):
 
 
 class DescriptorSystem(object):
-    def __init__(self, load_item):
+    def __init__(self, load_item, resources_fs):
         """
         load_item: Takes a Location and returns an XModuleDescriptor
+        resources_fs: A Filesystem object that contains all of the
+            resources needed for the course
         """
 
         self.load_item = load_item
+        self.resources_fs = resources_fs
 
 
 class XMLParsingSystem(DescriptorSystem):
-    def __init__(self, load_item, process_xml, fs):
+    def __init__(self, load_item, resources_fs, process_xml):
         """
         process_xml: Takes an xml string, and returns the the XModuleDescriptor created from that xml
-        fs: A Filesystem object that contains all of the xml resources needed to parse
-            the course
         """
+        DescriptorSystem.__init__(self, load_item, resources_fs)
         self.process_xml = process_xml
-        self.fs = fs