fix(nix): Make sure bssl is in the PATH; workaround nix build failure…

flake.nix

@@ -1,20 +1,24 @@
 {
   description = "AWS-LC is a general-purpose cryptographic library";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
 
-  outputs = { self, nix, nixpkgs, flake-utils }:
+  outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-        shells = import ./nix/devshell.nix { pkgs = pkgs; };
-
-      in rec {
-        packages.aws-lc = pkgs.stdenv.mkDerivation {
+        aws-lc = pkgs.stdenv.mkDerivation {
           src = self;
           name = "aws-lc";
           inherit system;
           nativeBuildInputs = [ pkgs.ninja pkgs.cmake pkgs.perl pkgs.go ];
+          # Workaround builds trying to write to $HOME: https://github.com/NixOS/nix/issues/670
+          preBuild = ''
+            export HOME=$PWD
+          '';
           cmakeFlags = [
             "-GNinja"
             "-DBUILD_SHARED_LIBS=ON"
@@ -24,9 +28,15 @@
             ninja run_minimal_tests
           '';
         };
+        shells = import ./nix/devshell.nix {
+          inherit pkgs;
+          inherit aws-lc;
+        };
+
+      in rec {
+        packages.aws-lc = aws-lc;
         formatter = pkgs.nixfmt;
         packages.default = packages.aws-lc;
         devShells.default = shells;
       });
 }
-

nix/devshell.nix

@@ -1,10 +1,18 @@
-{ pkgs }:
+{ pkgs, aws-lc }:
 pkgs.mkShell rec {
-  buildInputs = [ pkgs.cmake ];
-  packages = [ pkgs.nixfmt-classic pkgs.ninja pkgs.cmake pkgs.perl pkgs.go ];
+  buildInputs = [
+    pkgs.cmake
+    pkgs.nixfmt-classic
+    pkgs.ninja
+    pkgs.perl
+    pkgs.go
+    aws-lc
+  ];
+
   shellHook = ''
-    echo "Entering a devShell..."
-    export PS1="[awslc nix] $PS1"
+    # Set custom prompt with ANSI color
+    export PS1="\[\033[1;32m\][aws-lc]\[\033[0m\] $PS1"
+    echo -e "\033[1;32mEntering AWS-LC development shell...\033[0m"
     function clean {(set -e
       rm -rf ./build
     )}