From 5a2bd826f84d26f257ce8aae4ec8709ce817c0f4 Mon Sep 17 00:00:00 2001
From: r-vdp <ramses@well-founded.dev>
Date: Mon, 28 Apr 2025 12:06:48 +0200
Subject: [PATCH] prometheus: use finalAttrs to make the version and webui
 overridable

This makes it possible to override the version and have the right webui
assets.
It also makes sure that the right version is used in other places of the
derivation.

Overriding now can be done like this:

```nix
final: prev:

  prometheus = prev.prometheus.overrideAttrs (
    finalAttrs: prevAttrs: {
      version = "3.1.0";
      src = final.fetchFromGitHub {
        owner = "prometheus";
        repo = "prometheus";
        tag = "v${finalAttrs.version}";
        hash = "";
      };
      vendorHash = "";

      webUiStatic = final.fetchurl {
        url = "https://github.com/prometheus/prometheus/releases/download/v${finalAttrs.version}/prometheus-web-ui-${finalAttrs.version}.tar.gz";
        hash = "";
      };
    }
  );
```

Whereas before you'd have to copy over things like the postPatch hook.
---
 pkgs/by-name/pr/prometheus/package.nix | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/pkgs/by-name/pr/prometheus/package.nix b/pkgs/by-name/pr/prometheus/package.nix
index 0908777635bb..f7985edd5f61 100644
--- a/pkgs/by-name/pr/prometheus/package.nix
+++ b/pkgs/by-name/pr/prometheus/package.nix
@@ -31,16 +31,9 @@
   enableZookeeper ? true,
 }:
 
-let
-  version = "3.1.0";
-  webUiStatic = fetchurl {
-    url = "https://github.com/prometheus/prometheus/releases/download/v${version}/prometheus-web-ui-${version}.tar.gz";
-    hash = "sha256-05DaaDIFtADnkLFqdHe5eUvo6LRz6BduMvGVmzOeurM=";
-  };
-in
-buildGoModule rec {
+buildGoModule (finalAttrs: {
   pname = "prometheus";
-  inherit version;
+  version = "3.1.0";
 
   outputs = [
     "out"
@@ -51,19 +44,24 @@ buildGoModule rec {
   src = fetchFromGitHub {
     owner = "prometheus";
     repo = "prometheus";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-Q3f0L6cRVQRL1AHgUI3VNbMG9eTfcApbXfSjOTHr7Go=";
   };
 
   vendorHash = "sha256-vQwBnSxoyIYTeWLk3GD9pKDuUjjsMfwPptgyVnzcTok=";
 
+  webUiStatic = fetchurl {
+    url = "https://github.com/prometheus/prometheus/releases/download/v${finalAttrs.version}/prometheus-web-ui-${finalAttrs.version}.tar.gz";
+    hash = "sha256-05DaaDIFtADnkLFqdHe5eUvo6LRz6BduMvGVmzOeurM=";
+  };
+
   excludedPackages = [
     "documentation/prometheus-mixin"
     "web/ui/mantine-ui/src/promql/tools"
   ];
 
   postPatch = ''
-    tar -C web/ui -xzf ${webUiStatic}
+    tar -C web/ui -xzf ${finalAttrs.webUiStatic}
 
     patchShebangs scripts
 
@@ -109,7 +107,7 @@ buildGoModule rec {
     [
       "-s"
       "-w"
-      "-X ${t}.Version=${version}"
+      "-X ${t}.Version=${finalAttrs.version}"
       "-X ${t}.Revision=unknown"
       "-X ${t}.Branch=unknown"
       "-X ${t}.BuildUser=nix@nixpkgs"
@@ -142,4 +140,4 @@ buildGoModule rec {
       Frostman
     ];
   };
-}
+})