From b13b75c8f94de7a9a76e6b763c58a5a38c72d8c4 Mon Sep 17 00:00:00 2001
From: "R. Ryantm" <ryantm-bot@ryantm.com>
Date: Sun, 8 Mar 2026 04:10:04 +0000
Subject: [PATCH 1/2] c-blosc2: 2.22.0 -> 2.23.1

---
 pkgs/by-name/c-/c-blosc2/package.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/by-name/c-/c-blosc2/package.nix b/pkgs/by-name/c-/c-blosc2/package.nix
index 71c9e37e8b17..70671f1509ac 100644
--- a/pkgs/by-name/c-/c-blosc2/package.nix
+++ b/pkgs/by-name/c-/c-blosc2/package.nix
@@ -14,13 +14,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "c-blosc2";
-  version = "2.22.0";
+  version = "2.23.1";
 
   src = fetchFromGitHub {
     owner = "Blosc";
     repo = "c-blosc2";
     rev = "v${finalAttrs.version}";
-    sha256 = "sha256-0eB+8zSlKCuHK1J2HlBUmWEJumAXSV2xnYMvnFud75A=";
+    sha256 = "sha256-iyEB1Hnvo42tMHyB4pDfXru5doFwNiFuxq21Tr3zLIg=";
   };
 
   # https://github.com/NixOS/nixpkgs/issues/144170

From f01e4c84a49eec21438eb56987022b76a1fc7717 Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sat, 28 Mar 2026 18:59:17 +0000
Subject: [PATCH 2/2] python3Packages.blosc2: 3.12.2 -> 4.1.2

---
 .../python-modules/blosc2/default.nix         | 80 ++++++++++++++++---
 1 file changed, 71 insertions(+), 9 deletions(-)

diff --git a/pkgs/development/python-modules/blosc2/default.nix b/pkgs/development/python-modules/blosc2/default.nix
index b0c754f05411..1cd4e3187cd6 100644
--- a/pkgs/development/python-modules/blosc2/default.nix
+++ b/pkgs/development/python-modules/blosc2/default.nix
@@ -31,17 +31,46 @@
   runTorchTests ? lib.meta.availableOn stdenv.hostPlatform torch,
 }:
 
+let
+  sleefRev = "7623d6cfa2712462880fa63a4d0f0b5f775d1a83";
+  miniexprRev = "37bf6982bf9619036b47f095b7005bc3c87a7447";
+  tinyccRev = "41208bdc85612042f363f425cda4601b3ed90d64";
+in
 buildPythonPackage rec {
   pname = "blosc2";
-  version = "3.12.2";
+  version = "4.1.2";
   pyproject = true;
 
-  src = fetchFromGitHub {
-    owner = "Blosc";
-    repo = "python-blosc2";
-    tag = "v${version}";
-    hash = "sha256-t2tf8s2WwG4vEQbh8HACMtUjVrwmGby1yKd+IlL39PY=";
-  };
+  srcs = [
+    (fetchFromGitHub {
+      owner = "Blosc";
+      repo = "python-blosc2";
+      tag = "v${version}";
+      hash = "sha256-z5g3OXSKKR/2yQ5n1hb+br009xaX8C7HxbDDLVfSYNw=";
+    })
+    (fetchFromGitHub {
+      name = "miniexpr";
+      owner = "Blosc";
+      repo = "miniexpr";
+      rev = miniexprRev;
+      hash = "sha256-3YLdAZFYEtmENuQgDiitU3kw8JmW+V03zFSGXV3FwqE=";
+    })
+    (fetchFromGitHub {
+      name = "sleef";
+      owner = "shibatch";
+      repo = "sleef";
+      rev = sleefRev;
+      hash = "sha256-a0OB2gQI8RlR7liXdlOZo4xDl3f2p9thrCm8CwD2jRM=";
+    })
+    (fetchFromGitHub {
+      name = "tinycc";
+      owner = "Blosc";
+      repo = "minicc";
+      rev = tinyccRev;
+      hash = "sha256-lj0BC/A+Kv/VloLhFe3hmrdZ6QWv6mSrMn8HdHS9PfI=";
+    })
+  ];
+  sourceRoot = "source";
 
   nativeBuildInputs = [
     cmake
@@ -49,8 +78,39 @@ buildPythonPackage rec {
     pkg-config
   ];
 
+  # perform parameter expansion for CMAKE_ARGS
+  preUnpack =
+    let
+      cmakeArgs = toString [
+        (lib.cmakeBool "USE_SYSTEM_BLOSC2" true)
+        (lib.cmakeFeature "FETCHCONTENT_SOURCE_DIR_MINIEXPR" "$PWD/miniexpr")
+        (lib.cmakeFeature "FETCHCONTENT_SOURCE_DIR_SLEEF" "$PWD/sleef")
+        (lib.cmakeFeature "FETCHCONTENT_SOURCE_DIR_TINYCC" "$PWD/tinycc")
+      ];
+    in
+    ''
+      export CMAKE_ARGS="${cmakeArgs}"
+    '';
+  postUnpack = ''
+    # ensure our separately pinned versions correspond to those in source
+    if ! grep -F '${miniexprRev}' source/CMakeLists.txt ; then
+      echo 'Expected to find ${miniexprRev} in source/CMakeLists.txt:' \
+        'has miniexpr source been updated to match pinned version?'
+      exit 1
+    fi
+    if ! grep -F '${sleefRev}' miniexpr/CMakeLists.txt ; then
+      echo 'Expected to find ${sleefRev} in miniexpr/CMakeLists.txt:' \
+        'has sleef source been updated to match pinned version?'
+      exit 1
+    fi
+    if ! grep -F '${tinyccRev}' miniexpr/CMakeLists.txt ; then
+      echo 'Expected to find ${tinyccRev} in miniexpr/CMakeLists.txt:' \
+        'has tinycc source been updated to match pinned version?'
+      exit 1
+    fi
+  '';
+
   dontUseCmakeConfigure = true;
-  env.CMAKE_ARGS = lib.cmakeBool "USE_SYSTEM_BLOSC2" true;
 
   build-system = [
     cython
@@ -83,6 +143,8 @@ buildPythonPackage rec {
   disabledTests = [
     # attempts external network requests
     "test_with_remote"
+    # segfaults, but only under nix sandbox
+    "test_dsl_save_clamp"
   ]
   ++ lib.optionals (pythonAtLeast "3.14") [
     # https://github.com/Blosc/python-blosc2/issues/551
@@ -102,7 +164,7 @@ buildPythonPackage rec {
   meta = {
     description = "Python wrapper for the extremely fast Blosc2 compression library";
     homepage = "https://github.com/Blosc/python-blosc2";
-    changelog = "https://github.com/Blosc/python-blosc2/releases/tag/${src.tag}";
+    changelog = "https://github.com/Blosc/python-blosc2/releases/tag/${(builtins.head srcs).name}";
     license = lib.licenses.bsd3;
     maintainers = with lib.maintainers; [ ris ];
   };