diff --git a/src/macrogen/config.py b/src/macrogen/config.py
index d7e571a..f7f6bb0 100644
--- a/src/macrogen/config.py
+++ b/src/macrogen/config.py
@@ -271,8 +271,9 @@ def _apply_override(self, override=None):
             override = self.config_override
         for key, value in override.items():
             if value is not None:
-                logger.info('Overriding %s=%s with %s', key, self.config[key], value)
-                self.config[key] = value
+                if key in self.config:
+                    logger.info('Overriding %s=%s with %s', key, self.config[key], value)
+                    self.config[key] = value
 
     def __getattr__(self, item):
         if item == 'config' and not self.config_loaded:
diff --git a/src/macrogen/main.py b/src/macrogen/main.py
index 1676a0c..eeaa787 100755
--- a/src/macrogen/main.py
+++ b/src/macrogen/main.py
@@ -2,6 +2,7 @@
 
 import sys
 from argparse import ArgumentParser
+from pathlib import Path
 
 from macrogen.config import config
 from . import graph
@@ -10,26 +11,33 @@
 from .config import config
 
 def main(argv=sys.argv):
-    parser = ArgumentParser(argv[0])
+    parser = ArgumentParser()
+    parser.add_argument('-i', '--input', metavar='ZIP', help='Loads graph from zip file and runs the reporting', type=Path)
+    parser.add_argument('-o', '--output', metavar='ZIP', help='Saves graph to given zip file', type=Path)
+    parser.add_argument('--skip-reports', action='store_true', help='Do not write reports (use with -o)')
     group = parser.add_argument_group("Configuration options")
     config.prepare_options(group)
     options = parser.parse_args(argv[1:])
     config.config_override = vars(options)
 
-    graphs = graph.macrogenesis_graphs()
+    graphs = graph.MacrogenesisInfo(options.input)
 
-    report.write_order_xml(graphs)
+    if options.output:
+        graphs.save(options.output)
+
+    if not options.skip_reports:
+        report.write_order_xml(graphs)
+        report.report_help()
+        report.report_refs(graphs)
+        report.report_scenes(graphs)
+        report.report_missing(graphs)
+        report.report_components(graphs)
+        report.report_conflicts(graphs)
+        report.report_sources(graphs)
+        report.report_index(graphs)
+        report.report_downloads(graphs)
+        render_all()
 
-    report.report_help()
-    report.report_refs(graphs)
-    report.report_scenes(graphs)
-    report.report_missing(graphs)
-    report.report_components(graphs)
-    report.report_conflicts(graphs)
-    report.report_sources(graphs)
-    report.report_index(graphs)
-    report.report_downloads(graphs)
-    render_all()
 
 
 if __name__ == '__main__':