From a6a6e0be2c847f14ce983ce817f27606299c29eb Mon Sep 17 00:00:00 2001
From: Krzesimir Nowak <krzesimir@kinvolk.io>
Date: Wed, 17 Feb 2021 09:52:48 +0100
Subject: [PATCH] common: Make sure that NUM_JOBS is a positive integer

---
 common.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/common.sh b/common.sh
index 014b257307..a97c560fe8 100644
--- a/common.sh
+++ b/common.sh
@@ -8,7 +8,10 @@
 
 # The number of jobs to pass to tools that can run in parallel (such as make
 # and dpkg-buildpackage
-if [[ -z ${NUM_JOBS} ]]; then
+case "${NUM_JOBS}" in
+  *[!0-9]*) NUM_JOBS='' ;;
+esac
+if [[ -z ${NUM_JOBS} ]] || [[ ${NUM_JOBS} -eq 0 ]]; then
   NUM_JOBS=$(grep -c "^processor" /proc/cpuinfo)
 fi
 # Ensure that any sub scripts we invoke get the max proc count.