[rubygems/rubygems] Print warning when running potentially problematic rubygems + ruby combinations

https://github.com/rubygems/rubygems/commit/d6df0b7de0

Co-authored-by: André Arko <andre@arko.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/libexec/bundle b/libexec/bundle
index 08955b21fd..b8bf0d699b 100755
--- a/libexec/bundle
+++ b/libexec/bundle
@@ -18,6 +18,15 @@ end
 # Workaround for non-activated bundler spec due to missing https://github.com/rubygems/rubygems/commit/4e306d7bcdee924b8d80ca9db6125aa59ee4e5a3
 gem "bundler", Bundler::VERSION if Gem.rubygems_version < Gem::Version.new("2.6.2")
 
+if Gem.rubygems_version < Gem::Version.new("3.2.3") && Gem.ruby_version < Gem::Version.new("2.6.a") && !ENV["BUNDLER_NO_OLD_RUBYGEMS_WARNING"]
+  Bundler.ui.warn \
+    "Your RubyGems version (#{Gem::VERSION})) has a bug that prevents " \
+    "`required_ruby_version` from working for Bundler. Any scripts that use " \
+    "`gem install bundler` will break as soon as Bundler drops support for " \
+    "your Ruby version. Please upgrade RubyGems to avoid future breakage " \
+    "and silence this warning by running `gem update --system 3.2.3`"
+end
+
 if File.exist?(base_path)
   require_relative "../lib/bundler/friendly_errors"
 else