ell 0 -> 1
attrpath: ell
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoSha256 or cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorSha256 or vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/wri0y712h7fz6cvxxq5d5lqfnfgxn18s-packages.json.drv
building '/nix/store/wri0y712h7fz6cvxxq5d5lqfnfgxn18s-packages.json.drv'...

Going to be running update for following packages:
 - ell-0.63

Press Enter key to continue...
Running update for:
 - ell-0.63: UPDATING ...
 - ell-0.63: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/os-specific/linux/ell/default.nix b/pkgs/os-specific/linux/ell/default.nix
index 9175f477bd60..b340b21c4633 100644
--- a/pkgs/os-specific/linux/ell/default.nix
+++ b/pkgs/os-specific/linux/ell/default.nix
@@ -9,14 +9,14 @@
 
 stdenv.mkDerivation rec {
   pname = "ell";
-  version = "0.63";
+  version = "0.64";
 
   outputs = [ "out" "dev" ];
 
   src = fetchgit {
     url = "https://git.kernel.org/pub/scm/libs/ell/ell.git";
     rev = version;
-    hash = "sha256-husK3eurfL1NhRHgJUdFP6sYLqeZ4NSHa/tU8PUWmGo=";
+    hash = "sha256-LONfgFgPg8KCDwtw//WTOYQT9RpnIskdHAWcgafOhcg=";
   };
 
   nativeBuildInputs = [

No auto update branch exists
Old version 0.63" not present in staging derivation file with contents: { lib, stdenv
, fetchgit
, autoreconfHook
, pkg-config
, dbus
, sysctl
, gitUpdater
}:

stdenv.mkDerivation rec {
  pname = "ell";
  version = "0.64";

  outputs = [ "out" "dev" ];

  src = fetchgit {
    url = "https://git.kernel.org/pub/scm/libs/ell/ell.git";
    rev = version;
    hash = "sha256-LONfgFgPg8KCDwtw//WTOYQT9RpnIskdHAWcgafOhcg=";
  };

  nativeBuildInputs = [
    pkg-config
    autoreconfHook
  ];

  nativeCheckInputs = [
    dbus
    # required as the sysctl test works on some machines
    sysctl
  ];

  enableParallelBuilding = true;

  # tests sporadically fail on musl
  doCheck = !stdenv.hostPlatform.isMusl;

  passthru = {
    updateScript = gitUpdater {
      url = "https://git.kernel.org/pub/scm/libs/ell/ell.git";
    };
  };

  meta = with lib; {
    homepage = "https://git.kernel.org/pub/scm/libs/ell/ell.git";
    description = "Embedded Linux Library";
    longDescription = ''
      The Embedded Linux* Library (ELL) provides core, low-level functionality for system daemons. It typically has no dependencies other than the Linux kernel, C standard library, and libdl (for dynamic linking). While ELL is designed to be efficient and compact enough for use on embedded Linux platforms, it is not limited to resource-constrained systems.
    '';
    changelog = "https://git.kernel.org/pub/scm/libs/ell/ell.git/tree/ChangeLog?h=${version}";
    license = licenses.lgpl21Plus;
    platforms = platforms.linux;
    maintainers = with maintainers; [ mic92 dtzWill amaxine ];
  };
}