From 8decc34ccea1e7ff20658cea5963f34781d5be9a Mon Sep 17 00:00:00 2001
From: Knut Ahlers <knut@ahlers.me>
Date: Wed, 21 Feb 2018 10:35:45 +0100
Subject: [PATCH] Fix: Ensure the tool works on VMs with 1 CPU

Signed-off-by: Knut Ahlers <knut@ahlers.me>
---
 main.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/main.go b/main.go
index d5ad535..16f5555 100644
--- a/main.go
+++ b/main.go
@@ -69,8 +69,13 @@ func main() {
 		"num_cpu": runtime.NumCPU(),
 	}).Debugf("update-gotools started")
 
+	parallelRunners := runtime.NumCPU() - 1
+	if parallelRunners < 1 {
+		parallelRunners = 1
+	}
+
 	runPreCommands()
-	runPackageBuilds(runtime.NumCPU()-1, func(pkg pkgCfg) bool { return !pkg.Single })
+	runPackageBuilds(parallelRunners, func(pkg pkgCfg) bool { return !pkg.Single })
 	runPackageBuilds(1, func(pkg pkgCfg) bool { return pkg.Single })
 	runPostCommands()