SharedHelpers.trap assumes the prior handler for the signal is callable

[haines]

Describe the problem as clearly as you can

SharedHelpers.trap attempts to preserve any existing handler for a signal by invoking call on it.

rubygems/bundler/lib/bundler/shared_helpers.rb

Lines 148 to 153 in e7bf6b4

	def trap(signal, override = false, &block)
	prior = Signal.trap(signal) do
	block.call
	prior.call unless override
	end
	end

However, prior can be a string, resulting in

NoMethodError: undefined method `call' for "DEFAULT":String

Post steps to reproduce the problem

Run this script:

# frozen_string_literal: true

require 'bundler/inline'

gemfile true do # force installation so that SharedHelpers.trap('INT') is called in Bundler::Worker#initialize
  source 'https://rubygems.org'
  gem 'rake'
end

Process.kill 'INT', Process.pid
# => bundler/shared_helpers.rb:158:in `block in trap': undefined method `call' for "DEFAULT":String (NoMethodError)

Which command did you run?

bundler/inline

What were you expecting to happen?

I get the standard Ruby Interrupt exception when I interrupt the script

What actually happened?

If Bundler installed any gems, I get NoMethodError. If Bundler did not install any gems (and therefore did not trap SIGINT) then I get the correct Interrupt.

If not included with the output of your command, run bundle env and paste the output below

Bundler       2.2.23
  Platforms   ruby, x86_64-darwin-20
Ruby          2.7.3p183 (2021-04-05 revision 6847ee089d7655b2a0eea4fee3133aeacd4cc7cc) [x86_64-darwin20]
  Full Path   /Users/andrew/.rubies/ruby-2.7.3/bin/ruby
  Config Dir  /Users/andrew/.rubies/ruby-2.7.3/etc
RubyGems      3.2.23
  Gem Home    /Users/andrew/.gem/ruby/2.7.3
  Gem Path    /Users/andrew/.gem/ruby/2.7.3:/Users/andrew/.rubies/ruby-2.7.3/lib/ruby/gems/2.7.0
  User Home   /Users/andrew
  User Path   /Users/andrew/.gem/ruby/2.7.0
  Bin Dir     /Users/andrew/.gem/ruby/2.7.3/bin
Tools         
  Git         2.32.0
  RVM         not installed
  rbenv       not installed
  chruby      0.3.9

[deivid-rodriguez]

Thanks for the report. Can you send us a patch?