From 07b3dc5f98cfd75cff97c815f6abb854d1e5436c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Billeter?= <j@bitron.ch>
Date: Tue, 18 Jun 2019 10:08:08 +0200
Subject: _sandboxremote.py: Guard against gRPC channels in the main process

---
 src/buildstream/sandbox/_sandboxremote.py | 3 +++
 1 file changed, 3 insertions(+)

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']
 
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