Detached bash processes block Murex from closing

[tiymat]

Describe the bug:

1. From Murex, run bash
2. Spawn and disown a long-running process, e.g. sleep 20 & disown
3. Exit bash with exit
4. Attempt to exit Murex with exit

The exit command will block until the disowned process terminates.

Expected behaviour:
If the long-running process is managed by Bash, shouldn't Murex be able to close while the process is still running?

Screenshots:
N/A

Platform (please complete the following information):

• OS, output from uname -a if supported: 6.10.8-arch1-1
• Terminal Emulator: kitty 0.36.2
• Murex version, output from version --no-app-name: 6.2.4000

Additional context
This is quite a specific edge case and likely not very important in the scheme of things but I thought I'd file an issue to document it anyways.

[lmorg]

Funny enough, I'm working through some edge case job control bugs at the moment.

Thanks for raising this, it slots nicely into the wider piece I'm working on.

[lmorg]

@tiymat I haven't had chance to look at this yet but I have just merged some new job control code into develop. So if you have any spare time, can you try again with the latest code from develop please and let me know if there is any change.

[tiymat]

I can still reproduce this in 6.3.4003.

There was another difference that jumped out at me though. In the devel code I noticed my PS1 prompt wasn't displaying as it does in the current branch.

I did some investigation and it looks like my .bashrc gets sourced in the current release but not the devel branch.

[lmorg]

I think .bashrc is being sourced in both releases. It's more likely it's a break in

config set proc force-tty true

Bash was always a little more sensitive about the underlying TTY and I'd been fiddling with that feature to try and get compatibility with a different application.

I'll take a look at this. Thanks for testing and feeding back.

[lmorg]

I've not been able to reproduce this is either Linux nor macOS.

Can you confirm how Bash is being invoked please:

which bash

eg you should see something like:

» which bash
bash => (function) bash - GNU Bourne-Again SHell

and that function should look like the following:

» runtime --functions -> [[/bash/block]]

            # Wrapper script around `bash`

            config set proc strict-arrays false
            config set proc force-tty true

            exec bash @PARAMS

[tiymat]

In 6.3.4129, which bash gives bash => (function) bash - GNU Bourne-Again SHell and runtime --functions -> [[/bash/block]] gives

            # Wrapper script around `bash`
            
            config set proc strict-arrays false
            config set proc force-tty true
            
            exec bash @PARAMS

FWIW, bash reports its version as GNU bash, version 5.2.32(1)-release (x86_64-pc-linux-gnu)

---

I dug a bit deeper and have found something weird. My terminal emulator is Kitty, which is configured to run Murex as its shell by default. If I instead set the default shell to bash, and from bash run Murex, and from Murex run bash, and then sleep 10 & disown, I am able to instantly exit both the inner bash and the Murex shell without it hanging.

This is seeming more and more like an issue with my setup and not a general problem 😅

[lmorg]

I cannot replicate the lack of a bash prompt but I have now been able to replicate the disown issue. Let me take a look at this before we brush it off as a problem with your set up. Odds are, its more likely a Murex glitch.