From a65c7c8428fb2c50672e8e2f1d27e1416870cb5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?=
 <2887858+deivid-rodriguez@users.noreply.github.com>
Date: Mon, 15 Sep 2025 20:40:43 +0200
Subject: [PATCH] [rubygems/rubygems] Fix parallel installation issue

If using a gem with precompiled versions having different dependencies
than the generic version from a path source, and with a lockfile
including a precompiled version, we would materialize the
generic version, but end up using dependencies for the precompiled
version. That will result in the parallel installer missing the
specifications for the extra dependencies of the generic version,
causing a crash.

If we are materializing for installation, make sure we use the
materialized specification when traversing dependencies.

https://github.com/rubygems/rubygems/commit/5f75d75de7
---
 lib/bundler/materialization.rb            |  2 +-
 spec/bundler/install/gemfile/path_spec.rb | 49 +++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/lib/bundler/materialization.rb b/lib/bundler/materialization.rb
index 43124f25fb..82e48464a7 100644
--- a/lib/bundler/materialization.rb
+++ b/lib/bundler/materialization.rb
@@ -29,7 +29,7 @@ module Bundler
     end
 
     def dependencies
-      specs.first.runtime_dependencies.map {|d| [d, platform] }
+      (materialized_spec || specs.first).runtime_dependencies.map {|d| [d, platform] }
     end
 
     def materialized_spec
diff --git a/spec/bundler/install/gemfile/path_spec.rb b/spec/bundler/install/gemfile/path_spec.rb
index 55bf11928d..ea59f11bbe 100644
--- a/spec/bundler/install/gemfile/path_spec.rb
+++ b/spec/bundler/install/gemfile/path_spec.rb
@@ -831,6 +831,55 @@ RSpec.describe "bundle install with explicit source paths" do
     end
   end
 
+  context "when platform specific version locked, and having less dependencies that the generic version that's actually installed" do
+    before do
+      build_repo4 do
+        build_gem "racc", "1.8.1"
+        build_gem "mini_portile2", "2.8.2"
+      end
+
+      build_lib "nokogiri", "1.18.9", path: lib_path("nokogiri") do |s|
+        s.add_dependency "mini_portile2", "~> 2.8.2"
+        s.add_dependency "racc", "~> 1.4"
+      end
+
+      gemfile <<~G
+        source "https://gem.repo4"
+
+        gem "nokogiri", path: "#{lib_path("nokogiri")}"
+      G
+
+      lockfile <<~L
+        PATH
+          remote: #{lib_path("nokogiri")}
+          specs:
+            nokogiri (1.18.9)
+              mini_portile2 (~> 2.8.2)
+              racc (~> 1.4)
+            nokogiri (1.18.9-arm64-darwin)
+              racc (~> 1.4)
+
+        GEM
+          remote: https://rubygems.org/
+          specs:
+            racc (1.8.1)
+
+        PLATFORMS
+          #{lockfile_platforms}
+
+        DEPENDENCIES
+          nokogiri!
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+    end
+
+    it "works" do
+      bundle "install"
+    end
+  end
+
   describe "switching sources" do
     it "doesn't switch pinned git sources to rubygems when pinning the parent gem to a path source" do
       build_gem "foo", "1.0", to_system: true do |s|