move source image storage away from package directory

src/c3nav/mapdata/migrations/0038_source_image.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.4 on 2017-05-01 14:41
+from __future__ import unicode_literals
+
+import os
+
+from django.conf import settings
+from django.db import migrations, models
+
+
+def save_images_to_db(apps, schema_editor):
+    Source = apps.get_model('mapdata', 'Source')
+    for source in Source.objects.all():
+        image_path = os.path.join(settings.MAP_ROOT, source.package.directory, 'sources', source.name)
+        source.image = open(image_path, 'rb').read()
+        source.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('mapdata', '0037_auto_20170428_0902'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='source',
+            name='image',
+            field=models.BinaryField(default=b'', verbose_name='image data'),
+            preserve_default=False,
+        ),
+        migrations.RunPython(save_images_to_db),
+    ]