pixman 0 -> 1
attrpath: pixman
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/lnz5a3vnkbi2zdvcjpn8b05n9w3by2kd-packages.json.drv
building '/nix/store/lnz5a3vnkbi2zdvcjpn8b05n9w3by2kd-packages.json.drv'...

Going to be running update for following packages:
 - pixman-0.43.2

Press Enter key to continue...
Running update for:
 - pixman-0.43.2: UPDATING ...
 - pixman-0.43.2: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/libraries/pixman/default.nix b/pkgs/development/libraries/pixman/default.nix
index 0a15876db963..6b36dc03627e 100644
--- a/pkgs/development/libraries/pixman/default.nix
+++ b/pkgs/development/libraries/pixman/default.nix
@@ -21,14 +21,14 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "pixman";
-  version = "0.43.2";
+  version = "0.43.4";
 
   src = fetchurl {
     urls = with finalAttrs; [
       "mirror://xorg/individual/lib/${pname}-${version}.tar.gz"
       "https://cairographics.org/releases/${pname}-${version}.tar.gz"
     ];
-    hash = "sha256-6nkpflQY+1KNBGbotbkdG+iIV/o3BvSXd7KSWnKumSQ=";
+    hash = "sha256-oGJNuQGAx923n8epFRCT3DfGRtjDjT8jL3Z89kuFoiY=";
   };
 
   separateDebugInfo = !stdenv.hostPlatform.isStatic;

No auto update branch exists
Old version 0.43.2" not present in staging derivation file with contents: { lib
, stdenv
, fetchurl
, meson
, ninja
, pkg-config
, libpng
, glib /*just passthru*/

# for passthru.tests
, cairo
, qemu
, scribus
, tigervnc
, wlroots
, xwayland

, gitUpdater
, testers
}:

stdenv.mkDerivation (finalAttrs: {
  pname = "pixman";
  version = "0.43.4";

  src = fetchurl {
    urls = with finalAttrs; [
      "mirror://xorg/individual/lib/${pname}-${version}.tar.gz"
      "https://cairographics.org/releases/${pname}-${version}.tar.gz"
    ];
    hash = "sha256-oGJNuQGAx923n8epFRCT3DfGRtjDjT8jL3Z89kuFoiY=";
  };

  separateDebugInfo = !stdenv.hostPlatform.isStatic;

  nativeBuildInputs = [ meson ninja pkg-config ];

  buildInputs = [ libpng ];

  # Default "enabled" value attempts to enable CPU features on all
  # architectures and requires used to disable them:
  #   https://gitlab.freedesktop.org/pixman/pixman/-/issues/88
  mesonAutoFeatures = "auto";
  mesonFlags = [
    "-Diwmmxt=disabled"
  ]
  # Disable until https://gitlab.freedesktop.org/pixman/pixman/-/issues/46 is resolved
  ++ lib.optional (stdenv.isAarch64 && !stdenv.cc.isGNU) "-Da64-neon=disabled";

  preConfigure = ''
    # https://gitlab.freedesktop.org/pixman/pixman/-/issues/62
    export OMP_NUM_THREADS=$((NIX_BUILD_CORES > 184 ? 184 : NIX_BUILD_CORES))
  '';

  enableParallelBuilding = true;

  doCheck = true;

  postInstall = glib.flattenInclude;

  passthru = {
    tests = {
      inherit cairo qemu scribus tigervnc wlroots xwayland;
      pkg-config = testers.hasPkgConfigModules {
        package = finalAttrs.finalPackage;
      };
    };
    updateScript = gitUpdater {
      url = "https://gitlab.freedesktop.org/pixman/pixman.git";
      rev-prefix = "pixman-";
    };
  };

  meta = with lib; {
    homepage = "http://pixman.org";
    description = "A low-level library for pixel manipulation";
    license = licenses.mit;
    platforms = platforms.all;
    pkgConfigModules = [ "pixman-1" ];
  };
})