From 432fcb3fc356986867dfd8482f33873c683caca9 Mon Sep 17 00:00:00 2001
From: Mg Pig <w2xzzpig@hotmail.com>
Date: Sat, 18 Apr 2026 09:06:45 +0800
Subject: [PATCH 1/2] build(nix): add mold to the flake dev shell (#2122)

---
 .github/workflows/nix.yml | 10 +++++++++-
 flake.nix                 |  5 +++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 4590f6d7..75e1696a 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -6,12 +6,14 @@ on:
     paths:
       - "**/*.nix"
       - "flake.lock"
+      - "rust-toolchain.toml"
   pull_request:
     branches: ["main", "develop"]
     types: [opened, synchronize, reopened, ready_for_review]
     paths:
       - "**/*.nix"
       - "flake.lock"
+      - "rust-toolchain.toml"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
@@ -32,5 +34,11 @@ jobs:
       - name: Magic Nix Cache
         uses: DeterminateSystems/magic-nix-cache-action@v6
 
-      - name: Check full devShell
+      - name: Warm up full devShell
         run: nix develop .#full --command true
+
+      - name: Cargo check in flake environment
+        run: nix develop .#full --command cargo check
+
+      - name: Cargo build in flake environment
+        run: nix develop .#full --command cargo build
diff --git a/flake.nix b/flake.nix
index c33ab483..81650da5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -67,6 +67,7 @@
                   rust
                   protobuf
                   clang
+                  mold
                   pkg-config
                   bridge-utils # for three node test
                 ]
@@ -98,6 +99,10 @@
             KCP_SYS_EXTRA_HEADER_PATH = "${pkgs.libclang.lib}/lib/clang/19/include:${pkgs.glibc.dev}/include";
             JEMALLOC_OVERRIDE = "${pkgs.jemalloc}/lib/libjemalloc.so";
           }
+          // pkgs.lib.optionalAttrs pkgs.stdenv.isLinux {
+            CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER = "clang";
+            CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER = "clang";
+          }
           // (if hasFeature "android" then android.envVars else { }));
       in
       {

From 84430055ab0531aee691c6225f97da45cfa7eddf Mon Sep 17 00:00:00 2001
From: Luna Yao <40349250+ZnqbuZ@users.noreply.github.com>
Date: Sat, 18 Apr 2026 05:06:34 +0200
Subject: [PATCH 2/2] remove hashbrown (#2108)

---
 easytier/Cargo.toml              | 1 -
 easytier/src/peers/graph_algo.rs | 8 +++-----
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/easytier/Cargo.toml b/easytier/Cargo.toml
index b08830c4..9e2d0789 100644
--- a/easytier/Cargo.toml
+++ b/easytier/Cargo.toml
@@ -165,7 +165,6 @@ network-interface = "2.0"
 
 # for ospf route
 petgraph = "0.8.1"
-hashbrown = "0.15.3"
 ordered_hash_map = "0.5.0"
 
 # for wireguard
diff --git a/easytier/src/peers/graph_algo.rs b/easytier/src/peers/graph_algo.rs
index 63d1d6c9..333bcf5c 100644
--- a/easytier/src/peers/graph_algo.rs
+++ b/easytier/src/peers/graph_algo.rs
@@ -1,12 +1,10 @@
 use core::cmp::Ordering;
-use hashbrown::hash_map::{
-    Entry::{Occupied, Vacant},
-    HashMap,
-};
 use petgraph::{
     algo::Measure,
-    visit::{EdgeRef as _, IntoEdges, VisitMap as _, Visitable},
+    visit::{EdgeRef, IntoEdges, VisitMap, Visitable},
 };
+use std::collections::HashMap;
+use std::collections::hash_map::Entry::{Occupied, Vacant};
 use std::{collections::BinaryHeap, hash::Hash};
 
 /// `MinScored<K, T>` holds a score `K` and a scored object `T` in