From c38b8e1ae6385002985db2385295d815c61e5c14 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B8ren=20Rasmussen?= <sr@jondahl.net>
Date: Wed, 3 Aug 2022 15:30:52 +0200
Subject: [PATCH] Handle empty file on temperature reading

---
 pkg/temperature/ds18b20.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/temperature/ds18b20.go b/pkg/temperature/ds18b20.go
index a86740c..6c77a27 100644
--- a/pkg/temperature/ds18b20.go
+++ b/pkg/temperature/ds18b20.go
@@ -248,6 +248,10 @@ func read(sensor string) (int64, error) {
 
 	raw := string(data)
 
+	if raw == "" {
+		return NaN, fmt.Errorf("%v: %w: empty file", sensor, ErrReadSensor)
+	}
+
 	if !strings.Contains(raw, " YES") {
 		return NaN, fmt.Errorf("%v: %w: checksum failed [%v]", sensor, ErrReadSensor, raw)
 	}