Can't connect to functions shell when hosting emulator is running

[Hacksore]

[REQUIRED] Environment info

firebase-tools: 9.6.1

Platform: macOS

[REQUIRED] Test case

A project with all the emulators enabled (hosting, pubsub, functions, database, ui) - a good example is https://github.com/Hacksore/firebase-shell-bug

[REQUIRED] Steps to reproduce

See: https://github.com/Hacksore/firebase-shell-bug/blob/master/README.md

[REQUIRED] Expected behavior

I should be able to get the functions shell REPL while the hosting emulator is running.

[REQUIRED] Actual behavior

When all emulators are running via firebase emulators:start you will get a connection error when attempting to firebase functions:shell

Error: Port 5000 is not open on localhost, could not start functions emulator.

[samtstern]

@Hacksore have you tried passing the --port argument to choose a different port? firebase functions:shell --port 5001 should do it.

[Hacksore]

@samtstern I did indeed try when the emulators are running and it yielded no success.

firebase functions:shell --port 5001

Error: Port 5001 is not open on localhost, could not start functions emulator.

Having trouble? Try firebase [command] --help

[samtstern]

What if you do 5002?

…

On Mon, Mar 15, 2021 at 2:54 PM Sean Boult ***@***.***> wrote: @samtstern <https://github.com/samtstern> I did indeed try when the emulators are running and it yielded no success. firebase functions:shell --port 5001 Error: Port 5001 is not open on localhost, could not start functions emulator. Having trouble? Try firebase [command] --help — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#3210 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACATB2WYRRYOWZGBZPXKT7DTDYNT5ANCNFSM4ZFF67YQ> .

[Hacksore]

What if you do 5002?

This does work and I was able to get to the shell. Should this be required to do explicitly or is this a bug in the CLI?

[samtstern]

@Hacksore I'd say a bit of both. We should probably scan for a free port when running the shell instead of failing fast.