Allow user to override freezefile.

dataset/freeze/app.py

@@ -16,6 +16,8 @@ parser = argparse.ArgumentParser(
     epilog='For further information, please check the documentation.')
 parser.add_argument('config', metavar='CONFIG', type=str,
                     help='freeze file cofiguration')
+parser.add_argument('--db', default=None,
+                    help='Override the freezefile database URI')
 
 
 def freeze(result, format='csv', filename='freeze.csv',
@@ -91,6 +93,8 @@ def main():
         args = parser.parse_args()
         config = Configuration(args.config)
         for export in config.exports:
+            if args.db is not None:
+                export.data['database'] = args.db
             if export.skip:
                 log.info("Skipping: %s", export.name)
                 continue

docs/freezefile.rst

@@ -22,7 +22,10 @@ freeze file as its argument:
 
     datafreeze Freezefile.yaml
 
-Freeze files can be either written in JSON or in YAML.
+Freeze files can be either written in JSON or in YAML. The database URI 
+indicated in the Freezefile can also be overridden via the command line:
+
+    datafreeze --db sqlite:///foo.db Freezefile.yaml
 
 
 Example Freezefile.yaml

setup.py

@@ -2,7 +2,7 @@ from setuptools import setup, find_packages
 
 setup(
     name='dataset',
-    version='0.3.2',
+    version='0.3.3',
     description="Toolkit for Python-based data processing.",
     long_description="",
     classifiers=[