nethermind: add update script to regenerate nuget-deps.json

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: bbjubjub2494

packages/nethermind/nix-update-args

@@ -4,7 +4,6 @@
   fetchFromGitHub,
   lib,
   lz4,
-  nix-update-script,
   rocksdb,
   snappy,
   stdenv,
@@ -48,7 +47,7 @@ buildDotnetModule rec {
 
   passthru = {
     category = "Execution Clients";
-    updateScript = nix-update-script { };
+    updateScript = ./update.py;
   };
 
   meta = {

packages/nethermind/package.nix

@@ -0,0 +1,73 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p python3 nix-update
+"""Update script for nethermind package.
+
+nix-update handles version and source hash but cannot update nuget-deps.json.
+This script runs nix-update first, then uses the package's fetch-deps script
+to regenerate nuget-deps.json.
+"""
+
+import subprocess
+import sys
+from pathlib import Path
+
+SCRIPT_DIR = Path(__file__).parent
+FLAKE_ROOT = SCRIPT_DIR.parent.parent
+NUGET_DEPS = SCRIPT_DIR / "nuget-deps.json"
+
+
+def run_nix_update() -> bool:
+    """Run nix-update to handle version and source hash."""
+    print("Running nix-update...")
+    result = subprocess.run(
+        [
+            "nix-update",
+            "--flake",
+            "nethermind",
+            "--version-regex",
+            "^([0-9]+\\.[0-9]+\\.[0-9]+)$",
+            # https://github.com/Mic92/nix-update/issues/563
+            "--src-only",
+        ],
+        cwd=FLAKE_ROOT,
+    )
+    return result.returncode == 0
+
+
+def update_nuget_deps() -> None:
+    """Regenerate nuget-deps.json using the package's fetch-deps script."""
+    print("Building fetch-deps script...")
+    result = subprocess.run(
+        [
+            "nix",
+            "build",
+            ".#nethermind.fetch-deps",
+            "--no-link",
+            "--print-out-paths",
+        ],
+        capture_output=True,
+        text=True,
+        check=True,
+        cwd=FLAKE_ROOT,
+    )
+    fetch_deps_script = result.stdout.strip()
+
+    print("Regenerating nuget-deps.json...")
+    subprocess.run(
+        [fetch_deps_script, str(NUGET_DEPS)],
+        check=True,
+        cwd=FLAKE_ROOT,
+    )
+
+
+def main() -> None:
+    if not run_nix_update():
+        print("nix-update failed")
+        sys.exit(1)
+
+    update_nuget_deps()
+    print("Done")
+
+
+if __name__ == "__main__":
+    main()