Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: ethtool 0 -> 1
attrpath: ethtool
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] these 2 derivations will be built:
  /nix/store/4ppwiam4fyla522w5sfj1c0j3fqai8hk-update-ethtool.drv
  /nix/store/nf69b43436fxj3f9zw2cdsq8js7arrgg-packages.json.drv
building '/nix/store/4ppwiam4fyla522w5sfj1c0j3fqai8hk-update-ethtool.drv'...
building '/nix/store/nf69b43436fxj3f9zw2cdsq8js7arrgg-packages.json.drv'...

Going to be running update for following packages:
 - ethtool-6.15

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - ethtool-6.15: UPDATING ...
 - ethtool-6.15: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/et/ethtool/package.nix b/pkgs/by-name/et/ethtool/package.nix
index cdb6ad61e124..ccaed2c7e885 100644
--- a/pkgs/by-name/et/ethtool/package.nix
+++ b/pkgs/by-name/et/ethtool/package.nix
@@ -9,11 +9,11 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "ethtool";
-  version = "6.15";
+  version = "6.19";
 
   src = fetchurl {
     url = "mirror://kernel/software/network/ethtool/ethtool-${finalAttrs.version}.tar.xz";
-    hash = "sha256-lHfDZRFNkQEgquxTNqHRYZbIM9hIb3xtpnvt71eICt4=";
+    hash = "sha256-HCEUq24MDSqmfWmZYOsR3080HiQDE5zfKK6dqFimAl8=";
   };
 
   nativeBuildInputs = [

No auto update branch exists
Old version 6.15" not present in staging derivation file with contents: {
  lib,
  stdenv,
  fetchurl,
  libmnl,
  pkg-config,
  writeScript,
}:

stdenv.mkDerivation (finalAttrs: {
  pname = "ethtool";
  version = "6.19";

  src = fetchurl {
    url = "mirror://kernel/software/network/ethtool/ethtool-${finalAttrs.version}.tar.xz";
    hash = "sha256-HCEUq24MDSqmfWmZYOsR3080HiQDE5zfKK6dqFimAl8=";
  };

  nativeBuildInputs = [
    pkg-config
  ];

  buildInputs = [
    libmnl
  ];

  enableParallelBuilding = true;

  passthru = {
    updateScript = writeScript "update-ethtool" ''
      #!/usr/bin/env nix-shell
      #!nix-shell -i bash -p curl pcre common-updater-scripts

      set -eu -o pipefail

      # Expect the text in format of '<a href="ethtool-VER.tar.xz">...</a>'
      # The page always lists versions newest to oldest. Pick the first one.
      new_version="$(curl -s https://mirrors.edge.kernel.org/pub/software/network/ethtool/ |
          pcregrep -o1 '<a href="ethtool-([0-9.]+)[.]tar[.]xz">' |
          head -n1)"
      update-source-version ethtool "$new_version"
    '';
  };

  meta = {
    description = "Utility for controlling network drivers and hardware";
    homepage = "https://www.kernel.org/pub/software/network/ethtool/";
    license = lib.licenses.gpl2Plus;
    platforms = lib.platforms.linux;
    maintainers = with lib.maintainers; [ bjornfor ];
    mainProgram = "ethtool";
  };
})