From 56f0670c1e304b99d9de7b6eac688c1e29263a61 Mon Sep 17 00:00:00 2001
From: servius <servius@darksailor.dev>
Date: Thu, 28 May 2026 02:27:14 +0530
Subject: [PATCH] fix: Override fetchurl UA for crates.io (403 on default curl
 UA)

crates.io now blocks the default nixpkgs curl User-Agent (curl/X.Y
Nixpkgs/Z), returning 403. Override fetchurl via overlay to send a
neutral UA for any crates.io URL so cargoLock / fetchCrate fetches
succeed.
---
 overlays.nix              |  1 +
 overlays/crates-io-ua.nix | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 overlays/crates-io-ua.nix

diff --git a/overlays.nix b/overlays.nix
index ce93e48..0877bb9 100644
--- a/overlays.nix
+++ b/overlays.nix
@@ -3,6 +3,7 @@
 in
   [
     # Local overlays
+    (import ./overlays/crates-io-ua.nix args)
     (import ./overlays/shell-scripts.nix args)
     (import ./overlays/terminal.nix args)
     (import ./overlays/system-libs.nix args)
diff --git a/overlays/crates-io-ua.nix b/overlays/crates-io-ua.nix
new file mode 100644
index 0000000..d7bbf5f
--- /dev/null
+++ b/overlays/crates-io-ua.nix
@@ -0,0 +1,12 @@
+{inputs, ...}: final: prev: {
+  fetchurl =
+    prev.fetchurl
+    // {
+      __functor = self: args:
+        prev.fetchurl (
+          if builtins.isAttrs args && prev.lib.hasInfix "crates.io" (args.url or "")
+          then args // {curlOptsList = (args.curlOptsList or []) ++ ["--user-agent" "nix-fetchurl"];}
+          else args
+        );
+    };
+}
-- 
2.51.2