From 101f582196a161a06b62b38fe55c7f8c0a04b54d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@dashbit.co>
Date: Thu, 15 Apr 2021 20:09:54 +0200
Subject: [PATCH] Use known cookie when starting runtimes (#199)

---
 .github/workflows/test.yaml             | 2 +-
 lib/livebook/runtime/standalone_init.ex | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 62fb58219..26bb9152a 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -19,7 +19,7 @@ jobs:
       - name: Check formatting
         run: mix format --check-formatted
       - name: Run tests
-        run: mix test
+        run: elixir --cookie "COOKIEFORTESTS" -S mix test
       - name: Install Node
         uses: actions/setup-node@v2
         with:
diff --git a/lib/livebook/runtime/standalone_init.ex b/lib/livebook/runtime/standalone_init.ex
index e75917394..db81fc69c 100644
--- a/lib/livebook/runtime/standalone_init.ex
+++ b/lib/livebook/runtime/standalone_init.ex
@@ -54,7 +54,10 @@ defmodule Livebook.Runtime.StandaloneInit do
       # Enable ANSI escape codes as we handle them with HTML.
       "+sbwt none +sbwtdcpu none +sbwtdio none -elixir ansi_enabled true",
       # Make the node hidden, so it doesn't automatically join the cluster
-      "--hidden"
+      "--hidden",
+      # Use the cookie in Livebook
+      "--cookie",
+      Atom.to_string(Node.get_cookie())
     ]
   end