Add script for migrating Dandiset metadata

tools/migrate-dandisets.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+import click
+import requests
+
+from dandi.dandiapi import DandiAPIClient
+from dandi.dandiset import APIDandiset
+
+
+@click.command()
+@click.option(
+    "-d", "--delete-extant", is_flag=True, help="Delete Dandisets that already exist"
+)
+@click.argument("api_url")
+@click.argument("token")
+@click.argument("dandiset_path", nargs=-1)
+def main(api_url, token, dandiset_path, delete_extant):
+    client = DandiAPIClient(api_url=api_url, token=token)
+    with client.session():
+        for dpath in dandiset_path:
+            dandiset = APIDandiset(dpath)
+            if delete_extant:
+                try:
+                    client.get_dandiset(dandiset.identifier, "draft")
+                except requests.HTTPError as e:
+                    if e.response.status_code != 404:
+                        raise
+                else:
+                    print("Dandiset", dandiset.identifier, "already exists; deleting")
+                    client.delete(f"/dandisets/{dandiset.identifier}/")
+            print("Creating Dandiset", dandiset.identifier)
+            client.create_dandiset(
+                name=dandiset.metadata.get("name", ""), metadata=dandiset.metadata
+            )
+
+
+if __name__ == "__main__":
+    main()