Better behavior for failed connections in brew search

Fixes Homebrew/homebrew#20868.

Library/Homebrew/cmd/search.rb

@@ -33,7 +33,11 @@ module Homebrew extend self
 
         if count == 0 and not blacklisted? query
           puts "No formula found for #{query.inspect}. Searching open pull requests..."
-          GitHub.find_pull_requests(rx) { |pull| puts pull }
+          begin
+            GitHub.find_pull_requests(rx) { |pull| puts pull }
+          rescue GitHub::Error => e
+            opoo e.message
+          end
         end
       end
     end
@@ -81,6 +85,8 @@ module Homebrew extend self
       end
     end
     results
+  rescue GitHub::Error
+    []
   end
 
   def search_formulae rx

Library/Homebrew/utils.rb

@@ -261,6 +261,8 @@ end
 module GitHub extend self
   ISSUES_URI = URI.parse("https://api.github.com/legacy/issues/search/mxcl/homebrew/open/")
 
+  Error = Class.new(StandardError)
+
   def open url, headers={}, &block
     default_headers = {'User-Agent' => HOMEBREW_USER_AGENT}
     default_headers['Authorization'] = "token #{HOMEBREW_GITHUB_API_TOKEN}" if HOMEBREW_GITHUB_API_TOKEN
@@ -271,6 +273,8 @@ module GitHub extend self
     else
       raise e
     end
+  rescue SocketError => e
+    raise Error, "Failed to connect to: #{url}\n#{e.message}"
   end
 
   def each_issue_matching(query, &block)