Add script to set ContainerRun.md5 on existing runs, as part of #751.

kive/container/management/commands/set_run_md5s.py

@@ -0,0 +1,25 @@
+from __future__ import print_function
+
+from django.core.management.base import BaseCommand
+
+from container.models import ContainerRun
+
+
+class Command(BaseCommand):
+    help = "Set MD5 on any runs that still have a blank."
+
+    def handle(self, **kwargs):
+        batch_size = 100
+        run_count = 0
+        print('Starting.')
+        while True:
+            runs = ContainerRun.objects.filter(md5='')[:batch_size]
+            batch_count = len(runs)
+            if not batch_count:
+                break
+            for run in runs:
+                run.set_md5()
+                run.save()
+            run_count += batch_count
+            print('Set MD5 on {} runs.'.format(run_count))
+        print('Done.')