Getting WARN -- : posix_spawn is not yet supported on x86_64-cygwin (x86_64-cygwin), falling back to default implementation.

[bolandross]

Getting WARN -- : posix_spawn is not yet supported on x86_64-cygwin (x86_64-cygwin), falling back to default implementation.

[JoshCheek]

There's not :(

I opened an issue on ChildProcess: enkessler/childprocess#176

Locally I did this, which worked for me:

I'm not sure what to do in the long-run. I think, ideally I would be able to use Ruby's builtin spawn method, but I'm not sure it can handle all the things I need from it (I haven't looked into it recently). This is how I'm currently using it:

seeing_is_believing/lib/seeing_is_believing/evaluate_by_moving_files.rb

Lines 81 to 149 in 46d49a5

	child = ChildProcess.build(*popen_args)
	child.cwd = file_directory if local_cwd
	child.leader = true
	child.duplex = true
	child.environment.merge!(env)
	child.io.stdout = child_stdout
	child.io.stderr = child_stderr
	child.start
	# close child streams b/c they won't emit EOF if parent still has an open reference
	close_streams(child_stdout, child_stderr)
	child.io.stdin.binmode
	child.io.stdin.sync = true
	# Start receiving events from the child
	eventstream = event_server.accept
	# send stdin (char at a time b/c input could come from a stream)
	Thread.new do
	begin
	provided_input.each_char { |char| child.io.stdin.write char }
	rescue
	# don't explode if child closes IO
	ensure
	child.io.stdin.close
	end
	end
	# set up the event consumer
	consumer = EventStream::Consumer.new(events: eventstream, stdout: stdout, stderr: stderr)
	consumer_thread = Thread.new do
	consumer.each do |e|
	swap_files.show_user_program if e.is_a? SeeingIsBelieving::EventStream::Events::FileLoaded
	event_handler.call e
	end
	end
	# wait for completion
	if timeout_seconds == 0
	child.wait
	else
	child.poll_for_exit(timeout_seconds)
	end
	consumer.process_exitstatus(child.exit_code)
	consumer_thread.join
	rescue ChildProcess::TimeoutError
	consumer.process_timeout(timeout_seconds)
	child.stop
	consumer_thread.join
	ensure
	# On Windows, we need to call stop if there is an error since it interrupted
	# the previos waiting/polling. If we don't call stop, in that situation, it will
	# leave orphan processes. On Unix, we need to always call stop or it may leave orphans
	begin
	if ChildProcess.unix?
	child.stop
	elsif $!
	child.stop
	consumer.process_exitstatus(child.exit_code)
	end
	child.alive? && child.stop
	rescue ChildProcess::Error
	# On AppVeyor, I keep getting errors
	# The handle is invalid: https://ci.appveyor.com/project/JoshCheek/seeing-is-believing/build/22
	# Access is denied: https://ci.appveyor.com/project/JoshCheek/seeing-is-believing/build/24
	end
	close_streams(stdout, stderr, eventstream, event_server)
	end

These are the tests it would need to pass:

[bolandross]

Hey and thanks for getting back to this.

Since I am using seeing_is_believing as a vim-plugin (and additionally not being very experienced with any of these involved components) I took a crowbar approach and removed the warning line from the childprocess source file in the gems directory 😅 as soon as I'll have a bit more time to spare, I'll try some more experimenting for a more elegant solution.

[JoshCheek]

I was thinking about this some more, and my answer above may have not been exactly what you were asking. If all you want to do is to suppress warning, then you can probably do this:

ruby -W0 -S seeing_is_believing ...

🤔 that could be difficult though, if you're using an editor integration, because it may not give you the ability to configure that. Maybe instead use the RUBYOPT env var, set it to -W0 and then Ruby should turn warnings off when running SiB.

[JoshCheek]

This isn't released yet, but I've locally got it working... except for on Windows 😅 Hoping to release it soon, though.