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From c2e6a4f03d95c944fa79deed297e6aba33471305 Mon Sep 17 00:00:00 2001
From: Ivan Shapovalov <intelfx@intelfx.name>
Date: Tue, 15 Apr 2025 17:37:05 +0700
Subject: [PATCH 1/2] test/e2e: allow overriding the default Prometheus binary

In addition to `$THANOS_TEST_PROMETHEUS_PATHS` that allows overriding
the set of Prometheus versions to test, also accept
`$THANOS_TEST_PROMETHEUS_PATH` to allow overriding the single
Prometheus version that is used as fallback.
---
 pkg/testutil/e2eutil/prometheus.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkg/testutil/e2eutil/prometheus.go b/pkg/testutil/e2eutil/prometheus.go
index a6db07a9..1862361d 100644
--- a/pkg/testutil/e2eutil/prometheus.go
+++ b/pkg/testutil/e2eutil/prometheus.go
@@ -48,6 +48,7 @@ const (
 	defaultMinioVersion        = "RELEASE.2022-07-30T05-21-40Z"
 
 	// Space delimited list of versions.
+	prometheusBinEnvVar   = "THANOS_TEST_PROMETHEUS_PATH"
 	promPathsEnvVar       = "THANOS_TEST_PROMETHEUS_PATHS"
 	alertmanagerBinEnvVar = "THANOS_TEST_ALERTMANAGER_PATH"
 	minioBinEnvVar        = "THANOS_TEST_MINIO_PATH"
@@ -89,7 +90,11 @@ var (
 )
 
 func PrometheusBinary() string {
-	return "prometheus-" + defaultPrometheusVersion
+	b := os.Getenv(prometheusBinEnvVar)
+	if b == "" {
+		return fmt.Sprintf("prometheus-%s", defaultPrometheusVersion)
+	}
+	return b
 }
 
 func AlertmanagerBinary() string {
-- 
2.49.0.5.g15b5d850cb1