From 56e814a7103e0d52fd53f168ebb477fbed28a2c6 Mon Sep 17 00:00:00 2001
From: Florian Klink <flokli@flokli.de>
Date: Thu, 16 Apr 2026 20:56:17 +0100
Subject: [PATCH] grafana-alloy: set and enforce beylaVersion

Since https://github.com/grafana/alloy/pull/5735, grafana-alloy sets the
version of beyla in its ldflags.

Add the missing logic for that, and a little assertion to prevent this
from getting out of date.
---
 pkgs/by-name/gr/grafana-alloy/package.nix | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pkgs/by-name/gr/grafana-alloy/package.nix b/pkgs/by-name/gr/grafana-alloy/package.nix
index 2522ace1ada9..dde2ea8226ba 100644
--- a/pkgs/by-name/gr/grafana-alloy/package.nix
+++ b/pkgs/by-name/gr/grafana-alloy/package.nix
@@ -13,6 +13,11 @@
   lld,
   useLLD ? stdenv.hostPlatform.isArmv7,
 }:
+
+let
+  beylaVersion = "v3.6.0";
+in
+
 buildGoModule (finalAttrs: {
   pname = "grafana-alloy";
   version = "1.15.1";
@@ -49,6 +54,12 @@ buildGoModule (finalAttrs: {
 
   patchPhase = ''
     cp -av ${finalAttrs.frontend}/share internal/web/ui/dist
+
+    goSumBeylaVersion="$(grep beyla go.sum | head -1 | cut -d ' ' -f2)"
+    if [[ "$goSumBeylaVersion" != "${beylaVersion}" ]];then
+      echo "beyla version in go.sum ($goSumBeylaVersion) doesn't match the one set in the expression (${beylaVersion}), needs updating."
+      exit 1
+    fi
   '';
 
   modRoot = "collector";
@@ -66,6 +77,7 @@ buildGoModule (finalAttrs: {
     "-X github.com/grafana/alloy/internal/build.Revision=v${finalAttrs.version}"
     "-X github.com/grafana/alloy/internal/build.BuildUser=nix@nixpkgs"
     "-X github.com/grafana/alloy/internal/build.BuildDate=1970-01-01T00:00:00Z"
+    "-X github.com/grafana/beyla/pkg/buildinfo=${beylaVersion}"
   ];
 
   tags = [