[rubygems/rubygems] Add useful error message for plugin load

If a plugin has previously been installed, but the path is no longer
valid, `rake setup` will fail with an unexpected error due to the file
not existing.

Instead, we want to present the user with what the issue is and how to
resolve the problem.

https://github.com/rubygems/rubygems/commit/0c6ad3ecbb

1 files changed, 20 insertions, 1 deletions

diff --git a/lib/bundler/plugin.rb b/lib/bundler/plugin.rb
index 588fa79be8..7790a3f6f8 100644
--- a/lib/bundler/plugin.rb
+++ b/lib/bundler/plugin.rb
@@ -342,7 +342,26 @@ module Bundler
       # done to avoid conflicts
       path = index.plugin_path(name)
 
-      Gem.add_to_load_path(*index.load_paths(name))
+      paths = index.load_paths(name)
+      invalid_paths = paths.reject {|p| File.directory?(p) }
+
+      if invalid_paths.any?
+        Bundler.ui.warn <<~MESSAGE
+          The following plugin paths don't exist: #{invalid_paths.join(", ")}.
+
+          This can happen if the plugin was installed with a different version of Ruby that has since been uninstalled.
+
+          If you would like to reinstall the plugin, run:
+
+          bundler plugin uninstall #{name} && bundler plugin install #{name}
+
+          Continuing without installing plugin #{name}.
+        MESSAGE
+
+        return
+      end
+
+      Gem.add_to_load_path(*paths)
 
       load path.join(PLUGIN_FILE_NAME)