From 251cc1c26dd2d7de7a522ac202bc576a706faca6 Mon Sep 17 00:00:00 2001
From: Earl Warren <contact@earl-warren.org>
Date: Sat, 11 Nov 2023 11:21:05 +0100
Subject: [PATCH] [LXC] global lock on start

Since the start script may create LXC templates that are shared, they
may race against each other when running for the first time. A lock
global to the host needs to be used to guarantee that does not happen.
---
 pkg/runner/run_context.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkg/runner/run_context.go b/pkg/runner/run_context.go
index d273fd2..1f0924f 100644
--- a/pkg/runner/run_context.go
+++ b/pkg/runner/run_context.go
@@ -194,6 +194,8 @@ var lxcHelpers string
 
 var startTemplate = template.Must(template.New("start").Parse(`#!/bin/bash -e
 
+exec 5<>/tmp/forgejo-runner-lxc.lock ; flock --timeout 21600 5
+
 LXC_CONTAINER_CONFIG="{{.Config}}"
 LXC_CONTAINER_RELEASE="{{.Release}}"