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-rw-r--r--src/buildstream/sandbox/_sandboxremote.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/buildstream/sandbox/_sandboxremote.py b/src/buildstream/sandbox/_sandboxremote.py
index 2cb7e2538..d90b164bc 100644
--- a/src/buildstream/sandbox/_sandboxremote.py
+++ b/src/buildstream/sandbox/_sandboxremote.py
@@ -60,6 +60,9 @@ class SandboxRemote(Sandbox):
if config is None:
return
+ # gRPC doesn't support fork without exec, which is used in the main process.
+ assert not utils._is_main_process()
+
self.storage_url = config.storage_service['url']
self.exec_url = config.exec_service['url']