[rubygems/rubygems] Fix crash when no matching variants are found for the current platform

If we are resolving a dependency against a particular platform, and
there are no platform specific variants of the candidates that match
that platform, we should not consider those candidates.

https://github.com/rubygems/rubygems/commit/f6077fe27d

2 files changed, 22 insertions, 1 deletions

diff --git a/lib/bundler/resolver.rb b/lib/bundler/resolver.rb
index dfea95e30a..fdb297d677 100644
--- a/lib/bundler/resolver.rb
+++ b/lib/bundler/resolver.rb
@@ -134,6 +134,7 @@ module Bundler
           end
           nested.reduce([]) do |groups, (version, specs)|
             next groups if locked_requirement && !locked_requirement.satisfied_by?(version)
+            next groups unless specs.any? {|spec| spec.match_platform(platform) }
 
             specs_by_platform = Hash.new do |current_specs, current_platform|
               current_specs[current_platform] = select_best_platform_match(specs, current_platform)
@@ -145,7 +146,7 @@ module Bundler
             next groups if @resolving_only_for_ruby
 
             spec_group = SpecGroup.create_for(specs_by_platform, @platforms, platform)
-            groups << spec_group if spec_group
+            groups << spec_group
 
             groups
           end
diff --git a/spec/bundler/install/gemfile/specific_platform_spec.rb b/spec/bundler/install/gemfile/specific_platform_spec.rb
index ce2823ce9a..3acc29041e 100644
--- a/spec/bundler/install/gemfile/specific_platform_spec.rb
+++ b/spec/bundler/install/gemfile/specific_platform_spec.rb
@@ -282,6 +282,26 @@ RSpec.describe "bundle install with specific platforms" do
     bundle "install --verbose"
   end
 
+  it "does not resolve if the current platform does not match any of available platform specific variants for a top level dependency" do
+    build_repo2 do
+      build_gem("sorbet-static", "0.5.6433") {|s| s.platform = "x86_64-linux" }
+      build_gem("sorbet-static", "0.5.6433") {|s| s.platform = "universal-darwin-20" }
+    end
+
+    gemfile <<~G
+      source "#{file_uri_for(gem_repo2)}"
+
+      gem "sorbet-static", "0.5.6433"
+    G
+
+    simulate_platform "arm64-darwin-21" do
+      bundle "install", :raise_on_error => false
+    end
+
+    expect(err).to include("Could not find gem 'sorbet-static (= 0.5.6433) arm64-darwin-21' in rubygems repository #{file_uri_for(gem_repo2)}/ or installed locally.")
+    expect(err).to include("The source contains the following gems matching 'sorbet-static (= 0.5.6433)': sorbet-static-0.5.6433-universal-darwin-20, sorbet-static-0.5.6433-x86_64-linux")
+  end
+
   private
 
   def setup_multiplatform_gem