bash_kernel bug with readline > v8.0 in conda environments

[CriticalSci]

When accessing this kernel in a conda environment containing readline v8.1 (as is the default in conda-forge or defaults channels) every command output returns garbled with exit status 1 in the Jupyter notebook.

Only readline v8 (the default in the anaconda channel) restores normal behaviour.

Note the Jupyter lab server is also running nb_conda_kernels to access kernels across conda environments.

Can anyone advise what could be the problem here? Is there something in readline 8.1 breaking the code? Or is this specific to my setup?

The problematic environment configuration arises with anything other than anaconda as top priority channel:

conda create --name dev_bash bash ipykernel bash_kernel

[goekce]

could be related to #107

try with

bind 'set enable-bracketed-paste off'

Does someone know why this problem exists in bash_kernel?

more info on bracketed paste

[takluyver]

That does look like it might be related to bracketed paste. At a guess, bash is sending the escape codes to switch bracketed paste mode on & off, but Jupyter's limited terminal emulation doesn't support them, so they both show up and interfere with checking exit codes.

Disabling bracketed paste mode is probably a good idea. With bash_kernel, you can't paste anything directly into the bash session anyway (it's running behind the Jupyter machinery), so there's no need for it. I think the right place to fix it is this file in pexpect, if anyone wants to make a PR.

[CriticalSci]

could be related to #107

try with

bind 'set enable-bracketed-paste off'

Thanks, this does fix the problem (temporarily) for the duration of each session!

[ackalker]

could be related to #107
try with

bind 'set enable-bracketed-paste off'

Thanks, this does fix the problem (temporarily) for the duration of each session!

@CriticalSci Please see my comment in #117 (comment) for a hack that could help the workaround to 'stick' for all Bash kernel notebooks.

[takluyver]

I think #120 should fix this.