From 2ea20ff62872ef2a10687511ac413417340499eb Mon Sep 17 00:00:00 2001
From: Calle Pettersson <carlpett@users.noreply.github.com>
Date: Sun, 24 May 2020 17:23:13 +0200
Subject: [PATCH] Check that collectors given on --collectors.enabled exist
 before trying to construct them

---
 collector/collector.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/collector/collector.go b/collector/collector.go
index edcb880b..97812d76 100644
--- a/collector/collector.go
+++ b/collector/collector.go
@@ -1,6 +1,7 @@
 package collector
 
 import (
+	"fmt"
 	"strconv"
 	"strings"
 
@@ -72,7 +73,11 @@ func Available() []string {
 	return cs
 }
 func Build(collector string) (Collector, error) {
-	return builders[collector]()
+	builder, exists := builders[collector]
+	if !exists {
+		return nil, fmt.Errorf("Unknown collector %q", collector)
+	}
+	return builder()
 }
 func getPerfQuery(collectors []string) string {
 	parts := make([]string, 0, len(collectors))