From 418465d234535080b2e7225c68c26ee861b93045 Mon Sep 17 00:00:00 2001
From: "PAEPCKE, Michael" <git@paepcke.de>
Date: Sun, 30 Mar 2025 11:53:20 +0000
Subject: [PATCH] prometheus-chrony-exporter: add versionCheckHook and linker
 attrs

---
 .../pr/prometheus-chrony-exporter/package.nix | 27 ++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/pkgs/by-name/pr/prometheus-chrony-exporter/package.nix b/pkgs/by-name/pr/prometheus-chrony-exporter/package.nix
index 19340391e592..49b2d5bb5506 100644
--- a/pkgs/by-name/pr/prometheus-chrony-exporter/package.nix
+++ b/pkgs/by-name/pr/prometheus-chrony-exporter/package.nix
@@ -3,8 +3,8 @@
   buildGoModule,
   fetchFromGitHub,
   nix-update-script,
+  versionCheckHook,
 }:
-
 buildGoModule (finalAttrs: {
   pname = "prometheus-chrony-exporter";
   version = "0.12.0";
@@ -13,18 +13,39 @@ buildGoModule (finalAttrs: {
     owner = "superq";
     repo = "chrony_exporter";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-ZXqCZZx0UG8050SYgVwD+wnTX0N41Bjv1dhdQmOHmR4=";
+    hash = "sha256-W7MWshRuQdbxLm0XKkTHXN+pjwoX7wnCtjaeXyszr/Q=";
+    leaveDotGit = true;
+    postFetch = ''
+      cd "$out"
+      date -u -d "@$(git log -1 --pretty=%ct)" "+%Y-%m-%dT%H:%M:%SZ" > $out/BUILD_COMMIT_DATE
+      find "$out" -name .git -print0 | xargs -0 rm -rf
+    '';
   };
 
-  vendorHash = "sha256-3zL7BrCdMVnt7F1FiZ2eQnKVhmCeW3aYKKX9v01ms/k=";
+  # do not use real BuildDate, but fixed imagenary (commit date) for binary reproducibility
+  preBuild = ''
+    ldflags+=" -X github.com/prometheus/common/version.BuildDate=$(cat BUILD_COMMIT_DATE)"
+  '';
 
   ldflags = [
     "-s"
     "-w"
+    "-X github.com/prometheus/common/version.Version=${finalAttrs.version}"
+    "-X github.com/prometheus/common/version.Revision=${finalAttrs.src.rev}"
+    "-X github.com/prometheus/common/version.Branch=master"
+    "-X github.com/prometheus/common/version.BuildUser=nix@nixpkgs"
   ];
 
+  vendorHash = "sha256-3zL7BrCdMVnt7F1FiZ2eQnKVhmCeW3aYKKX9v01ms/k=";
+
   passthru.updateScript = nix-update-script { };
 
+  nativeInstallCheckInputs = [ versionCheckHook ];
+
+  doInstallCheck = true;
+  versionCheckProgram = "${placeholder "out"}/bin/chrony_exporter";
+  versionCheckProgramArg = "--version";
+
   meta = {
     changelog = "https://github.com/superq/chrony_exporter/releases/tag/v${finalAttrs.version}";
     homepage = "https://github.com/superq/chrony";