fix(backup): send required public DAV upload marker

Assistant: codex
Assistant-Model: gpt-6.1-sol
Assistant-Session: 01a1029d-2c93-7500-a0e0-e3e089668b29

scripts/migrate_nextcloud_backup_account.py

@@ -40,6 +40,9 @@ class NoRedirect(urllib.request.HTTPRedirectHandler):
 def request(url, method='GET', body=None, auth=None, headers=None):
     require(url.startswith(HOST + '/'), 'unapproved_provider_origin')
     headers = dict(headers or {})
+    # Public DAV rejects non-GET requests without AJAX marker when federation is disabled.
+    if url.startswith(HOST + '/public.php/dav/') and method != 'GET':
+        headers['X-Requested-With'] = 'XMLHttpRequest'
     if auth:
         headers['Authorization'] = 'Basic ' + base64.b64encode((auth[0] + ':' + auth[1]).encode()).decode()
     req = urllib.request.Request(url, data=body, method=method, headers=headers)

scripts/root_custody_finish.py

@@ -94,7 +94,7 @@ def roundtrip(bundle, lane, operator, network=None, get_quota=None, progress=lam
         raise FinishFailure('backup_size_or_quota_invalid')
     name='root-custody-history-'+datetime.now(timezone.utc).strftime('%Y%m%dT%H%M%SZ')+'-'+uuid.uuid4().hex+'.json.age'
     progress('provider_upload',artifact=name)
-    status,_=network(upload+'/forgejo/'+name,'PUT',encrypted,(values['NC_WEBDAV_TOKEN'],''),{'Content-Type':'application/octet-stream','If-None-Match':'*'})
+    status,_=network(upload+'/forgejo/'+name,'PUT',encrypted,(values['NC_WEBDAV_TOKEN'],''),{'Content-Type':'application/octet-stream','If-None-Match':'*','X-Requested-With':'XMLHttpRequest'})
     progress('provider_upload',upload_http_status=status)
     if status!=201:
         raise FinishFailure('new_artifact_upload_failed')
@@ -196,6 +196,7 @@ def main(receipt_reserved=False):
                           digest=state['digest'],current_live_baseline_matches=True)
             progress('backup_lane_read')
             lane=bao.read(LANE)
+            result['lane_kv_version']=lane['metadata']['version']
             progress('backup_operator_read')
             operator=bao.read(OPERATOR_PATH)['data']
             progress('historical_share_comparison')