Burrito without epmd can no longer start app

[mmower]

Hi.

I'm building a command-line tool in Elixir using Burrito. Because of the nature of the tool and to avoid firewall warnings I am using

rel/vm.args.eex -start_epmd false

And all was well. Now fast forward a month or so and I am trying to execute the command again:

Irulan:grue matt$ ./burrito_out/rez_macos Protocol 'inet_tcp': register/listen error: econnrefused

As far as I can tell this is a result of epmd not being present. As far as I can ascertain (I am no Erlang expert) the BEAM looks for epmd when started as a distributed node (e.g. using -name or -sname). As far as I know I am not doing that, there'd be no reason to.

git status tells me that I haven't changed my code since it was working and I don't think I've changed my Elixir or Erlang versions (according to asdf they are 1.31.1-otp-24 & 24.2 respectively).

I'm really not sure where to start with this and maybe you think it's nothing to do with Burrito. But I figured I'd ask you guys first.

Any ideas why this might have changed or what I can do about it?

Thanks.

[doawoo]

Hello! We have an existing issue regarding supporting startup without epmd -- I have to look into the issue (https://github.com/burrito-elixir/burrito/issues/26), but I'll be away at a conference this weekend, and would happily take a look into this once I'm back!

[mmower]

Thanks, @doawoo. For now, I will switch back to escript so I can go on testing. Burrito was really about distribution and I'm not quite there yet. Happy to provide more info or help test fixes.

[doawoo]

Sorry for the wait, I can confirm that I'm seeing the same error with the example app, working on a fix now!

[doawoo]

Alright, I just pushed a new WIP branch digit/epmd-shim.

1. Try updating your git mix.exs dep line to use that branch instead of main
2. Use this in your VM Args file: -start_epmd false -epmd_module Elixir.Burrito.Util.EpmdShim

Let me know if this achieves the totally epmd-less release you're looking for!

[mmower]

Sorry, I didn't see the notification for this … I will give it a try and let you know. Thank you.

[mmower]

I'm testing this but it seems like the start_epmd functionality isn't working now. I got the macOS firewall alert again.

rel/vm_args.eex

-start_epmd false -epmd_module Elixir.Burrito.Util.EpmdShim

Also, in the intervening time, I've forgotten how to invoke this properly. It's a CLI rather than a server tool so I am passing arguments to it. I know I had this working but my command history isn't long enough to find my invoking it before.

I thought maybe it was:

_build/dev/rel/rez/bin/rez start --option --other_option command blah

Where rez is the name of the file, but it doesn't look like this reaches my start/2 call. When I run this it hangs without any further output.

Any ideas where I might be going wrong now?

[bsedat]

Just to check, do you have a rel/env.bat.eex, rel/env.sh.eex which set RELEASE_DISTRIBUTION=none? The bat file should have set RELEASE_DISTRIBUTION=none and the sh file should have export RELEASE_DISTRIBUTION=none.

[doawoo]

Cleaning up the issues tab a bit today. If you are still having issues please feel free to re-open/re-create this issue :)