[rubygems/rubygems] Stop bundler eagerly loading all specs with exts

We were setting the wrong `extension_dir` for git specs stubs

Additionally, the call to `self.extension_dir` was loading the
remote spec, which was avoidable since the stub had an extension dir
(and in fact its #gem_build_complete_path does exactly what we want
anyway)

Finally, now set the base_dir when loading the remote_spec from a
stub specification, since the git source sets the base dir for stubs
based on where the spec _will_ be installed to, and we want to preserve
that so the base_dir for the loaded spec & the stub are the same

https://github.com/rubygems/rubygems/commit/a94acb465b

1 files changed, 21 insertions, 0 deletions

diff --git a/spec/bundler/runtime/setup_spec.rb b/spec/bundler/runtime/setup_spec.rb
index f02f81f697..5be9c49fef 100644
--- a/spec/bundler/runtime/setup_spec.rb
+++ b/spec/bundler/runtime/setup_spec.rb
@@ -728,6 +728,27 @@ end
     R
 
     run <<-R
+      File.open(File.join(Gem.dir, "specifications", "broken-ext.gemspec"), "w") do |f|
+        f.write <<-RUBY
+# -*- encoding: utf-8 -*-
+# stub: broken-ext 1.0.0 ruby lib
+# stub: a.ext\\0b.ext
+
+Gem::Specification.new do |s|
+  s.name = "broken-ext"
+  s.version = "1.0.0"
+  raise "BROKEN GEMSPEC EXT"
+end
+        RUBY
+      end
+      # Need to write the gem.build_complete file,
+      # otherwise the full spec is loaded to check the installed_by_version
+      extensions_dir = Gem.default_ext_dir_for(Gem.dir) || File.join(Gem.dir, "extensions", Gem::Platform.local.to_s, Gem.extension_api_version)
+      Bundler::FileUtils.mkdir_p(File.join(extensions_dir, "broken-ext-1.0.0"))
+      File.open(File.join(extensions_dir, "broken-ext-1.0.0", "gem.build_complete"), "w") {}
+    R
+
+    run <<-R
       puts "WIN"
     R