Expect script inside bash and resize of terminal

Asked Feb 02 '21 at 14:35

Active Feb 03 '21 at 01:02

Viewed 339 times

I'm trying to get terminal resize working inside SSH session, that is spawned by expect, which is spawned by bash.

#!/bin/bash

...
SSH_PASS=XXXXX
SSH_ADDR=YYYYY

expect <(cat << EOD

    trap {
        set rows [stty rows]
        set cols [stty columns]
        stty rows $rows columns $cols < $spawn_out(slave,name)
    } WINCH
    
    spawn ssh $SSH_ADDR
    expect "Password:"
    send -- "${SSH_PASS}\n"
    interact
EOD
)

When terminal is resizing, I'm getting messages like

couldn't open (slave,name): no such file or directory
while executing
"stty rows  columns  < (slave,name)"

So, I assume, var $spawn_out(slave,name), that is created by expect is not visible inside. How it could be achieved? I've tried

global spawn_out

but it doesn't help.

Thanks in advance!

PS: I can't use SSH keys here, it's limitation I can't bypass.

edited Feb 02 '21 at 15:28

pynexj

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asked Feb 02 '21 at 14:35

Ihor Olkhovskyi

see https://stackoverflow.com/a/40377508/900078 – pynexj Feb 02 '21 at 15:09
Take a look at my [sexpect (Expect for Shells)](https://github.com/clarkwang/sexpect) which you can use to write Expect scripts with **shell code only**. `sexpect` handles `SIGWINCH` automatically. – sexpect - Expect for Shells Feb 02 '21 at 15:19
@pynexj I'm not sure this is the way, cause I'm not passing vars from external script to expect, it's expect itself setting those vars. – Ihor Olkhovskyi Feb 02 '21 at 16:05
@sexpect_Expect.for.Shells thanks, will take a look. First - compiling it on OpenSUSE ) – Ihor Olkhovskyi Feb 02 '21 at 16:05
@sexpect_Expect.for.Shells Yup, your tool is working super fine, thanks! Will wait for maybe expect gurus will point me to solution without it, but as of now - many thanks! – Ihor Olkhovskyi Feb 02 '21 at 21:54

Expect script inside bash and resize of terminal

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