self.wait_write("hostnamectl set-hostname %s" % (self.hostname)) not work

[BurlyLuo]

2025-12-16 12:03:16,349: vrnetlab       DEBUG writing to serial console: 'hostnamectl set-hostname sonic1'
2025-12-16 12:03:16,349: vrnetlab       INFO waiting for '#' on serial console
2025-12-16 12:03:16,544: vrnetlab       INFO read from serial console: ' hostnamectl set-hostname sonic1
root@sonic:~#'
2025-12-16 12:03:16,544: vrnetlab       DEBUG writing to serial console: 'sleep 1'
2025-12-16 12:03:16,544: vrnetlab       INFO waiting for '#' on serial console
2025-12-16 12:03:17,540: vrnetlab       INFO read from serial console: ' sleep 1
**root@sonic:~#'**
2025-12-16 12:03:17,541: vrnetlab       DEBUG writing to serial console: 'printf '127.0.0.1\tsonic1\n' >> /etc/hosts'
2025-12-16 12:03:17,541: vrnetlab       INFO waiting for '#' on serial console
2025-12-16 12:03:17,603: vrnetlab       INFO read from serial console: ' printf '127.0.0.1\tsonic1\n' >> /etc/hosts
root@sonic:~#'
2025-12-16 12:03:17,603: vrnetlab       DEBUG writing to serial console: 'sleep 1'
2025-12-16 12:03:17,603: launch         INFO completed bootstrap configuration
2025-12-16 12:03:17,603: launch     TRACE    Backup file /config/config_db.json not found
2025-12-16 12:03:17,604: launch         INFO Startup complete in: 0:00:53.830442

vrnetlab/sonic/docker/launch.py

Line 105 in c467f0d

self.wait_write("sudo -i", "$")

even with sudo -i 1st. but it's still not take effect.

[root@rowan> ~]# ds
CONTAINER ID   IMAGE                                 COMMAND                  STATUS                        NAMES
0ac5ca80e85e   192.168.2.100:5000/nettool            "/sbin/tini -g -- /e…"   Up About a minute             clab-vs-net2
825037d7e7b0   192.168.2.100:5000/sonic-vpp:latest   "/launch.py --userna…"   Up About a minute (healthy)   clab-vs-sonic2
82c8b6bbd7cc   192.168.2.100:5000/sonic-vpp:latest   "/launch.py --userna…"   Up About a minute (healthy)   clab-vs-sonic1
146fa6eb3d17   192.168.2.100:5000/nettool            "/sbin/tini -g -- /e…"   Up About a minute             clab-vs-net1
[root@rowan> ~]# ssh admin@82c8b6bbd7cc
The authenticity of host '82c8b6bbd7cc (172.20.20.2)' can't be established.
RSA key fingerprint is SHA256:Ed5y54y041typlbxi+PPUEM8ugM3jaLwvYazwi7bWj8.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '82c8b6bbd7cc' (RSA) to the list of known hosts.
Debian GNU/Linux 12 \n \l

Linux sonic 6.1.0-29-2-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.123-1 (2025-01-02) x86_64
You are on
  ____   ___  _   _ _  ____
 / ___| / _ \| \ | (_)/ ___|
 \___ \| | | |  \| | | |
  ___) | |_| | |\  | | |___
 |____/ \___/|_| \_|_|\____|

-- Software for Open Networking in the Cloud --

Unauthorized access and/or use are prohibited.
All access and/or use are subject to monitoring.

Help:    https://sonic-net.github.io/SONiC/

Last login: Tue Dec 16 12:03:14 2025
admin@sonic:~$ 

we can see the hostname is still: admin@sonic:~$
2025-12-16 12:03:16,349: vrnetlab DEBUG writing to serial console: 'hostnamectl set-hostname sonic1'
from logs. it should be sonic1.