Added data migration

cvat/apps/engine/migrations/0029_auto_20200814_2153.py

@@ -0,0 +1,53 @@
+from django.db import migrations
+from django.conf import settings
+import os
+from cvat.apps.engine.mime_types import mimetypes
+from pyunpack import Archive
+
+def unzip(apps, schema_editor):
+    Data = apps.get_model("engine", "Data")
+    data_q_set = Data.objects.all()
+    archive_paths = []
+    archive_mimes = [
+        'application/gzip',
+        'application/rar'
+        'application/x-7z-compressed',
+        'application/x-bzip',
+        'application/x-bzip-compressed-tar',
+        'application/x-compress',
+        'application/x-compressed-tar',
+        'application/x-cpio',
+        'application/x-gtar-compressed',
+        'application/x-lha',
+        'application/x-lhz',
+        'application/x-lrzip-compressed-tar',
+        'application/x-lz4',
+        'application/x-lzip',
+        'application/x-lzip-compressed-tar',
+        'application/x-lzma',
+        'application/x-lzma-compressed-tar',
+        'application/x-lzop',
+        'application/x-tar',
+        'application/x-tarz',
+        'application/x-tzo',
+        'application/x-xz-compressed-tar',
+        'application/zip',
+    ]
+
+    for data_instance in data_q_set:
+        for root, _, files in os.walk(os.path.join(settings.MEDIA_DATA_ROOT, '{}/raw/'.format(data_instance.id))):
+            archive_paths.extend([os.path.join(root, file) for file in files if mimetypes.guess_type(file)[0] in archive_mimes])
+
+    for path in archive_paths:
+        Archive(path).extractall(os.path.dirname(path))
+        os.remove(path)
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('engine', '0028_data_storage_method'),
+    ]
+
+    operations = [
+        migrations.RunPython(unzip)
+    ]