chore: add command to migrate from fs to S3

umap/management/commands/migrate_to_S3.py

@@ -0,0 +1,29 @@
+from django.conf import settings
+from django.core.management.base import BaseCommand
+
+from umap.models import DataLayer
+from umap.storage import UmapFileSystem
+
+
+class Command(BaseCommand):
+    help = "Migrate latest datalayers from filesystem to S3."
+
+    def handle(self, *args, **options):
+        assert settings.UMAP_READONLY, "You must run that script with a read-only uMap."
+        assert (
+            settings.STORAGES["data"]["BACKEND"] == "umap.storage.UmapS3"
+        ), "You must configure your storages to point to S3"
+        fs_storage = UmapFileSystem()
+        for datalayer in DataLayer.objects.all():
+            geojson_fs_path = str(datalayer.geojson)
+            try:
+                datalayer.geojson.save(
+                    datalayer.geojson.name, fs_storage.open(geojson_fs_path)
+                )
+            except FileNotFoundError as e:
+                print(e)
+                print(geojson_fs_path, "not found on disk")
+                continue
+            if options["verbosity"] > 1:
+                print("Migrated:", geojson_fs_path)
+            datalayer.save(force_update=True)