sort and pretty print dataverse.json

so that we can track changes and only update the lines of the files that need updating

repo2docker/contentproviders/dataverse.py

@@ -10,7 +10,14 @@ from ..utils import copytree, deep_get
 
 
 class Dataverse(DoiProvider):
-    """Provide contents of a Dataverse dataset."""
+    """
+    Provide contents of a Dataverse dataset.
+    
+    This class loads a a list of existing Dataverse installations from the internal
+    file dataverse.json. This file is manually updated with the following command:
+
+        python setup.py generate_dataverse_file
+    """
 
     def __init__(self):
         data_file = os.path.join(os.path.dirname(__file__), "dataverse.json")

setup.py

@@ -31,8 +31,13 @@ class GenerateDataverseInstallationsFileCommand(Command):
         data = json.loads(resp_body.decode("utf-8"))
         if "installations" not in data:
             raise ValueError("Malformed installation map.")
-        with open("repo2docker/contentproviders/dataverse.json", "wb") as fp:
-            fp.write(resp_body)
+
+        def get_identifier(json):
+            return int(json["id"])
+
+        data["installations"].sort(key=get_identifier)
+        with open("repo2docker/contentproviders/dataverse.json", "w") as fp:
+            json.dump(data, fp, indent=4, sort_keys=True)
 
 
 __cmdclass = versioneer.get_cmdclass()