exec in bashrc to start zsh, paramiko exec_command cannot return result

[xiaoxinbioinfo]

Hello guys,

I ran into some problems using Paramiko to SSH to my server A:

My server is Centos7. I edit my .bashrc file on server A exec /data/install/bin/zsh to start ZSH, because I do not have root permission.

When I tried to connect to server A locally using Paramiko and execute commands, it seemed to work, but executing commands using exec_command didn't get the correct results.

When I comment the ZSH related statements in my .bashrc with "#", Paramiko exec_command returns normal result.

A code example is as follows:

import paramiko

pkey='/home/nich/.ssh/id_rsa'
key=paramiko.RSAKey.from_private_key_file(pkey)

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname='192.168.1.12',   port=22,    username='nich',    pkey=key)
stdin, stdout, stderr = ssh.exec_command('ls /data/nich/')
print(stdout.read())

When I have exec /data/install/bin/ ZSH in my.bashrc file, this Python code freezes and keeps running with no return unless I use CTRL +C to force it to end. Error info as follow:

File "", line 1, in
File "/data/nich/software/miniconda/lib/python3.9/site-packages/paramiko/file.py", line 200, in read
new_data = self._read(self._DEFAULT_BUFSIZE)
File "/data/nich/software/miniconda/lib/python3.9/site-packages/paramiko/channel.py", line 1361, in _read
return self.channel.recv(size)
File "/data/nich/software/miniconda/lib/python3.9/site-packages/paramiko/channel.py", line 699, in recv
out = self.in_buffer.read(nbytes, self.timeout)
File "/data/nich/software/miniconda/lib/python3.9/site-packages/paramiko/buffered_pipe.py", line 160, in read
self._cv.wait(timeout)
File "/data/nich/software/miniconda/lib/python3.9/threading.py", line 312, in wait
waiter.acquire()
KeyboardInterrupt

When I comment the ZSH related info with "#", the program returns a normal result:

b'2021.9.3.file\ntestfile.txt\n'

My question is :
My server A still wants to keep the ZSH-related configuration because I'm used to working with ZSH (can not work without zsh).
When I connect to server A using Paramiko, how do I execute commands and return results?

Thank you in advance for your help!

[hujiawei34]

i had same issue,but could use invoke_shell to get command output

[xiaoxinbioinfo]

i had same issue,but could use invoke_shell to get command output

I had solved it by moving exec zsh from .bashrc to .bash_profile.

The reason seems to related to which file was load when ssh to a server. I can't explain it well.
You can search the difference between bashrc and bash_profile.

[hujiawei34]

i had same issue,but could use invoke_shell to get command output

I had solved it by moving exec zsh from .bashrc to .bash_profile.

The reason seems to related to which file was load when ssh to a server. I can't explain it well. You can search the difference between bashrc and bash_profile.

In fact, the problem is that the paramiko is used to log in to the IBMC of some servers. After the exec_cmd command is executed, the result cannot be obtained. In this case, i need to manually run the send and recv method.