Nix hygiene

flake.nix

@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/master";
+    nixpkgs.url = "github:nixos/nixpkgs/release-24.11";
 
     # cross-platform convenience
     flake-utils.url = "github:numtide/flake-utils";
@@ -17,40 +17,67 @@
         pkgs = nixpkgs.legacyPackages.${system};
 
         # control versions
-        ruby = pkgs.ruby_3_3;
-        llvm = pkgs.llvmPackages_16;
-        gcc = pkgs.gcc13;
+        ruby = pkgs.ruby_3_4;
+        llvm = pkgs.llvmPackages_19;
+        gcc = pkgs.gcc14;
+
+        hook = ''
+          # get major.minor.0 ruby version
+          export RUBY_VERSION="$(ruby -e 'puts RUBY_VERSION.gsub(/\d+$/, "0")')"
+
+          # make gem install work in-project, compatibly with bundler
+          export GEM_HOME="$(pwd)/vendor/bundle/ruby/$RUBY_VERSION"
+
+          # make bundle work in-project
+          export BUNDLE_PATH="$(pwd)/vendor/bundle"
+
+          # enable calling gem scripts without bundle exec
+          export PATH="$GEM_HOME/bin:$PATH"
+
+          # enable implicitly resolving gems to bundled version
+          export RUBYGEMS_GEMDEPS="$(pwd)/Gemfile"
+        '';
+
+        deps = [
+          pkgs.libyaml.dev
+
+          # TODO: some gems insist on using `gcc` on Linux, satisfy them for now:
+          # - json
+          # - protobuf
+          # - ruby-prof
+          gcc
+        ];
       in {
-        devShell = pkgs.llvm.stdenv.mkDerivation {
+        devShells.default = llvm.stdenv.mkDerivation {
           name = "devshell";
 
-          buildInputs = with pkgs; [
-            ruby
-            libyaml.dev
+          buildInputs = [ ruby ] ++ deps;
 
-            # TODO: some gems insist on using `gcc` on Linux, satisfy them for now:
-            # - json
-            # - protobuf
-            # - ruby-prof
-            gcc
-          ];
+          shellHook = hook;
+        };
 
-          shellHook = ''
-            # get major.minor.0 ruby version
-            export RUBY_VERSION="$(ruby -e 'puts RUBY_VERSION.gsub(/\d+$/, "0")')"
+        devShells.ruby33 = llvm.stdenv.mkDerivation {
+          name = "devshell";
 
-            # make gem install work in-project, compatibly with bundler
-            export GEM_HOME="$(pwd)/vendor/bundle/ruby/$RUBY_VERSION"
+          buildInputs = [ pkgs.ruby_3_3 ] ++ deps;
 
-            # make bundle work in-project
-            export BUNDLE_PATH="$(pwd)/vendor/bundle"
+          shellHook = hook;
+        };
+
+        devShells.ruby32 = llvm.stdenv.mkDerivation {
+          name = "devshell";
+
+          buildInputs = [ pkgs.ruby_3_2 ] ++ deps;
+
+          shellHook = hook;
+        };
+
+        devShells.ruby31 = llvm.stdenv.mkDerivation {
+          name = "devshell";
 
-            # enable calling gem scripts without bundle exec
-            export PATH="$GEM_HOME/bin:$PATH"
+          buildInputs = [ pkgs.ruby_3_1 ] ++ deps;
 
-            # enable implicitly resolving gems to bundled version
-            export RUBYGEMS_GEMDEPS="$(pwd)/Gemfile"
-          '';
+          shellHook = hook;
         };
       }
     );

spec/datadog/tracing/contrib_spec.rb

@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 RSpec.describe Datadog::Tracing::Contrib do
-  root = Gem::Specification.find_by_name('datadog').gem_dir
+  root = Gem.loaded_specs['datadog'].gem_dir
 
   # Our module names are camelized directory name with some exceptions
   mapping = {