Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: fluxcd 2.8.5 -> 2.8.6 https://github.com/fluxcd/flux2/releases
attrpath: fluxcd
Checking auto update branch...
[version] 
[version] generic version rewriter does not support multiple hashes
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] skipping because derivation has updateScript
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/f2qm52hhs7q3qh36gvmb1wq4sw559wqq-packages.json.drv
building '/nix/store/f2qm52hhs7q3qh36gvmb1wq4sw559wqq-packages.json.drv'...

Going to be running update for following packages:
 - fluxcd-2.8.5

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - fluxcd-2.8.5: UPDATING ...
 - fluxcd-2.8.5: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/fl/fluxcd/package.nix b/pkgs/by-name/fl/fluxcd/package.nix
index 1bcb6d082fd1..39cd3c54a827 100644
--- a/pkgs/by-name/fl/fluxcd/package.nix
+++ b/pkgs/by-name/fl/fluxcd/package.nix
@@ -9,10 +9,10 @@
 }:
 
 let
-  version = "2.8.5";
-  srcHash = "sha256-2Q6l+egcRntGjieXpXz/frGGw4GMhGXxQAUOAZfxBE4=";
-  vendorHash = "sha256-D92vOyTvlpOou/1WHS6xpb4e8igZMQhm4DP7SVSLKPI=";
-  manifestsHash = "sha256-X0Cf8UZufqUWKLxYVjblYNCz5IU/s+mI+h6TpTeks5k=";
+  version = "2.8.6";
+  srcHash = "sha256-pKP4g2pTMYtx/B/Y3ow7tvDdhCSuwbszzeLVXB0W7Bo=";
+  vendorHash = "sha256-VBafft9/AuXaHWvZymy7P9gaSuO8D6IZHfK68Ixp3mI=";
+  manifestsHash = "sha256-h/HR/rJwPWXiuoj9T+LajdsdT4Jo8/EuN+O1I7e9sjI=";
 
   manifests = fetchzip {
     url = "https://github.com/fluxcd/flux2/releases/download/v${version}/manifests.tar.gz";

No auto update branch exists
Old version 2.8.5" not present in master derivation file with contents: {
  buildGoModule,
  fetchFromGitHub,
  fetchzip,
  installShellFiles,
  lib,
  stdenv,
  writableTmpDirAsHomeHook,
}:

let
  version = "2.8.6";
  srcHash = "sha256-pKP4g2pTMYtx/B/Y3ow7tvDdhCSuwbszzeLVXB0W7Bo=";
  vendorHash = "sha256-VBafft9/AuXaHWvZymy7P9gaSuO8D6IZHfK68Ixp3mI=";
  manifestsHash = "sha256-h/HR/rJwPWXiuoj9T+LajdsdT4Jo8/EuN+O1I7e9sjI=";

  manifests = fetchzip {
    url = "https://github.com/fluxcd/flux2/releases/download/v${version}/manifests.tar.gz";
    hash = manifestsHash;
    stripRoot = false;
  };
in

buildGoModule rec {
  pname = "fluxcd";
  inherit vendorHash version;

  src = fetchFromGitHub {
    owner = "fluxcd";
    repo = "flux2";
    rev = "v${version}";
    hash = srcHash;
  };

  postUnpack = ''
    cp -r ${manifests} source/cmd/flux/manifests

    # disable tests that require network access
    rm source/cmd/flux/create_secret_git_test.go
  '';

  ldflags = [
    "-s"
    "-w"
    "-X main.VERSION=${version}"
  ];

  subPackages = [ "cmd/flux" ];

  nativeBuildInputs = [ installShellFiles ];

  # Required to workaround test error:
  #   panic: mkdir /homeless-shelter: permission denied
  nativeCheckInputs = [ writableTmpDirAsHomeHook ];

  doInstallCheck = true;
  installCheckPhase = ''
    $out/bin/flux --version | grep ${version} > /dev/null
  '';

  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
    for shell in bash fish zsh; do
      installShellCompletion --cmd flux \
        --$shell <($out/bin/flux completion $shell)
    done
  '';

  passthru.updateScript = ./update.sh;

  meta = {
    changelog = "https://github.com/fluxcd/flux2/releases/tag/v${version}";
    description = "Open and extensible continuous delivery solution for Kubernetes";
    downloadPage = "https://github.com/fluxcd/flux2/";
    longDescription = ''
      Flux is a tool for keeping Kubernetes clusters in sync
      with sources of configuration (like Git repositories), and automating
      updates to configuration when there is new code to deploy.
    '';
    homepage = "https://fluxcd.io";
    license = lib.licenses.asl20;
    maintainers = with lib.maintainers; [
      jlesquembre
      ryan4yin
      SchahinRohani
      stealthybox
      superherointj
    ];
    mainProgram = "flux";
  };
}