Auto merge of #6349 - shime:check-if-stderr-is-closed-before-reporting-errors, r=segiddins

Fix to check if stderr was closed before writing to it

### What was the end-user problem that led to this PR?

See https://github.com/bundler/bundler/issues/6190

### What was your diagnosis of the problem?

The error is happening because we're not checking if stderr is closed prior to writing to it.

### What is your fix for the problem, implemented in this PR?

My fix is to add a check to determine if stderr was closed.

### Why did you choose this fix out of the possible options?

I chose to fix it here for a start and discuss with others if more checks were needed. Maybe we need to check if stderr is closed for all references of `$stderr.puts` and replace `abort` with `$stderr.puts` and `exit(1)`?

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/bundler/ui/shell.rb b/lib/bundler/ui/shell.rb
index fdf073ffb8..16e3d15713 100644
--- a/lib/bundler/ui/shell.rb
+++ b/lib/bundler/ui/shell.rb
@@ -109,6 +109,8 @@ module Bundler
       end
 
       def tell_err(message, color = nil, newline = nil)
+        return if @shell.send(:stderr).closed?
+
         newline ||= message.to_s !~ /( |\t)\Z/
         message = word_wrap(message) if newline.is_a?(Hash) && newline[:wrap]