ci: add a re-run manual workflow

Author: willcl-ark

.github/workflows/re-run.yml

@@ -0,0 +1,65 @@
+name: merge check
+
+on:
+  workflow_dispatch: # Must be run manually
+    inputs:
+      pr_number:
+        description: 'Pull request number to test'
+        required: true
+        type: string
+
+jobs:
+  check:
+    name: Check mergeability
+    runs-on: ubuntu-latest
+    env:
+      CCACHE_DIR: /home/runner/.ccache
+
+    steps:
+      - name: Checkout PR merge commit
+        uses: actions/checkout@v5
+        with:
+          ref: refs/pull/${{ inputs.pr_number }}/merge
+          fetch-depth: 1
+
+      - name: Create ccache dir
+        run: |
+          mkdir -p ${{ env.CCACHE_DIR }}
+
+      - name: Restore ccache
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.CCACHE_DIR }}
+          key: ccache-${{ runner.os }}-${{ github.sha }}
+          restore-keys: |
+            ccache-${{ runner.os }}-
+
+      - uses: cachix/install-nix-action@v31
+        with:
+          nix_path: nixpkgs=channel:nixos-25.05
+
+      - name: Set Up Cachix
+        uses: cachix/cachix-action@v15
+        with:
+          name: bitcoin-core
+          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
+
+      - name: Build bitcoind with ccache
+        run: |
+          nix develop ci/ --command bash -c "
+            cmake -B build \
+              -DCMAKE_C_COMPILER_LAUNCHER=ccache \
+              -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
+              -DCMAKE_BUILD_TYPE=Release \
+              -DBUILD_DAEMON=ON \
+              -DBUILD_BITCOIN_BIN=OFF \
+              -DBUILD_CLI=OFF \
+              -DBUILD_TX=OFF \
+              -DBUILD_UTIL=OFF \
+              -DBUILD_WALLET_TOOL=OFF \
+              -DBUILD_TESTS=OFF \
+              -DBUILD_BENCH=OFF \
+              -DENABLE_WALLET=OFF \
+              -DENABLE_EXTERNAL_SIGNER=OFF
+            cmake --build build --target bitcoind
+          "

ci/flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "Bitcoin Core build derivation";
+  description = "Bitcoin Core development environment";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
@@ -13,76 +13,41 @@
   }:
     flake-utils.lib.eachDefaultSystem (
       system: let
-        overlay = import ./overlay.nix;
         pkgs = import nixpkgs {
           inherit system;
-          overlays = [overlay];
         };
-        inherit (pkgs) lib stdenv;
-
-        # Shared dependencies for build and runtime
-        commonInputs = with pkgs; [
-          boost
-          capnproto
-          libevent
-          libsystemtap
-          linuxPackages.bcc
-          linuxPackages.bpftrace
-          sqlite.dev
-          zeromq
-        ];
-
-        bitcoind = pkgs.ccacheStdenv.mkDerivation {
-          pname = "bitcoin-core";
-          version = "unstable";
-
-          src = ../.;
-
-          nativeBuildInputs =
-            commonInputs
-            ++ (with pkgs; [
-              ccache
-              cmake
-              curlMinimal
-              ninja
-              pkg-config
-            ]);
-
-          buildInputs = commonInputs;
-
-          env = {
-            CMAKE_GENERATOR = "Ninja";
-            LD_LIBRARY_PATH = lib.makeLibraryPath [pkgs.capnproto];
-          };
+      in {
+        formatter = pkgs.alejandra;
 
-          cmakeFlags = [
-            "-DBUILD_DAEMON=ON"
-            "-DBUILD_BITCOIN_BIN=OFF"
-            "-DBUILD_CLI=OFF"
-            "-DBUILD_TX=OFF"
-            "-DBUILD_UTIL=OFF"
-            "-DBUILD_WALLET_TOOL=OFF"
-            "-DBUILD_TESTS=OFF"
-            "-DBUILD_BENCH=OFF"
-            "-DENABLE_WALLET=OFF"
-            "-DENABLE_EXTERNAL_SIGNER=OFF"
+        devShells.default = pkgs.mkShell.override {
+          stdenv = pkgs.gcc15Stdenv;
+        } {
+          buildInputs = with pkgs; [
+            ccache
+            cmake
+            ninja
+            pkg-config
+
+            boost
+            capnproto
+            libevent
+            libsystemtap
+            linuxPackages.bcc
+            linuxPackages.bpftrace
+            sqlite.dev
+            zeromq
           ];
 
-          stripAllList = ["bin"];
+          shellHook = ''
+            export CCACHE_COMPRESS=1
+            export CCACHE_SLOPPINESS=random_seed
+            export CCACHE_UMASK=007
+            export CMAKE_GENERATOR=Ninja
 
-          meta = with lib; {
-            description = "Bitcoin Core client";
-            homepage = "https://bitcoincore.org/";
-            license = licenses.mit;
-            platforms = platforms.all;
-          };
-        };
-      in {
-        formatter = pkgs.alejandra;
-        packages = {
-          default = bitcoind;
-          inherit bitcoind;
+            echo "CCACHE_DIR: $CCACHE_DIR"
+          '';
         };
       }
     );
 }
+