connect failure scenarios

tests/fakes/dest/hang_after_connect.rb

@@ -0,0 +1,34 @@
+#!/usr/bin/env ruby
+
+# Will open a server, accept a single connection, then sleep for 5
+# seconds.  After that time, the client should have disconnected,
+# which we can can't effectively check.
+#
+# This allows the test runner to check that the command-line sees the
+# right error message after the timeout time.
+
+require 'socket'
+require 'timeout'
+require 'flexnbd/constants'
+
+addr, port = *ARGV
+
+serve_sock = TCPServer.new( addr, port )
+client_sock = nil
+
+begin
+  # A failure here means a more serious issue with flexnbd
+  Timeout.timeout( 2 ) do
+    client_sock = serve_sock.accept
+  end
+rescue Timeout::Error
+  $stderr.puts "Client didn't make connection"
+  exit 1
+end
+
+# Sleep for one second past the timeout (a bit of slop in case ruby
+# doesn't launch things quickly)
+sleep(FlexNBD::MS_HELLO_TIME_SECS + 1)
+
+client_sock.close  if client_sock
+serve_sock.close