[yocto] Awkward line wrapping in bash

[phodina]

Hi,

so I tried the PS1 prompt as suggested by André and it worked at that time on the booted system. So I changed the configuration in /etc/profile, built and flashed the system.

Unfortunately it’s not working and I get the same issue - the line wrapping.

Here is the content of the /etc/profile:

# /etc/profile: system-wide .profile file for the Bourne shell (sh(1))
# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).

PATH="/usr/local/bin:/usr/bin:/bin"
EDITOR="vi"                     # needed for packages like cron, git-commit
[ "$TERM" ] || TERM="vt100"     # Basic terminal capab. For screen etc.

# Add /sbin & co to $PATH for the root user
[ "$HOME" != "/home/root" ] || PATH=$PATH:/usr/local/sbin:/usr/sbin:/sbin

# Set the prompt for bash and ash (no other shells known to be in use here)
[ -z "$PS1" ] || PS1="$(cat /etc/device/hwid)@\h:\w \001\033[96m\002# \001\033[0m\002"

if [ -d /etc/profile.d ]; then
        for i in /etc/profile.d/*.sh; do
                if [ -f $i -a -r $i ]; then
                        . $i
                fi
        done
        unset i
fi

# Make sure we are on a serial console (i.e. the device used starts with
# /dev/tty[A-z]), otherwise we confuse e.g. the eclipse launcher which tries do
# use ssh
case $(tty 2>/dev/null) in
        /dev/tty[A-z]*) [ -x /usr/bin/resize ] && /usr/bin/resize >/dev/null;;
esac

export PATH PS1 OPIEDIR QPEDIR QTDIR EDITOR TERM

umask 022


I also turned on `checkwinsize` using `shopt` but didn’t work.

I also include the output of stty (over serial):

speed 115200 baud; line = 0;
-brkint ixoff iutf8
-iexten

And over SSH:

speed 38400 baud; line = 0;
eol = M-^?; eol2 = M-^?;
-brkint ixany iutf8

I connect to the board over serial using screen on Mac. In minicom I get the same issue as do my colleagues on Windows using putty or screen on Linux. Same happens over SSH.

I also checked that the terming package and those files are installed correctly in /etc/terminfo.

Kind regards
Petr Hodina

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, September 16, 2019 1:02 PM, phodina <phodina at protonmail.com> wrote:

> Thanks André,
>
> the PS1 variable has been the cause. Now bash behaves as expected.
>
> Petr
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Monday, September 16, 2019 12:14 PM, André Castro andre.castro.sw at gmail.com wrote:
>
> > Hi Petr,
> > On Mon, 16 Sep 2019, at 10:34:33 AM (WEST+0100), Phodina wrote:
> >
> > > Hi,
> > > I would like to ask for a help with an awkward behavior of line wrap in bash
> > > built using Yocto (thud release). When I connect over serial line, I get strange
> > > line wrapping.
> >
> > This might not be related to Yocto.
> >
> > > The line keeps wrapping on the first line. Here is the environment:
> > > guest@:ebox~ # printenv
> > > LANG=C
> > > EDITOR=vi
> > > HZ=100
> > > HUSHLOGIN=FALSE
> > > USER=root
> > > PWD=/home/root
> > > HOME=/home/root
> > > SHELL=/bin/sh
> > > TERM=linux
> > > SHLVL=1
> > > LOGNAME=root
> > > PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
> > > PS1=guest@:ebox\w \033[96m# \033[0m
> > > _=/bin/printenv
> > > I looked for solution and the best direction seems to be run with clean
> > > environment env -i bash --norc --noprofile
> > > And the env:
> > > bash-4.4# printenv
> > > PWD=/home/root
> > > SHLVL=1
> > > _=/bin/printenv
> >
> > The probable cause of this is the "PS1" variable definition, specially the
> > colours part. Have a look at thread [1], maybe [2] answer will help.
> > My suggestion is:
> > PS1="guest@:ebox\w \001\033[96m\002# \001\033[0m\002"
> > [1]
> > https://unix.stackexchange.com/questions/105958/terminal-prompt-not-wrapping-correctly
> > [2]
> > https://unix.stackexchange.com/questions/105958/terminal-prompt-not-wrapping-correctly/447520#447520
> >
> > André