python paramiko wait to finish execute command

问题

I'm write this code in paramiko :

def TryExecute(hostname='192.168.1.1', user='root', passwd='root'):
    ssh = SSHClient()
    ssh.set_missing_host_key_policy(AutoAddPolicy())
    ssh.connect(hostname, username=user, password=passwd, timeout=3)
    #stdin, stdout, stderr =  ssh.exec_command("uname -a")

    session = ssh.invoke_shell()
    session.send("\n")

    session.send("echo step 1\n")
    time.sleep(1)

    session.send("sleep 30\n")
    time.sleep(1)

    while not session.recv_ready():
        time.wait(2)

    output = session.recv(65535)

    session.send("echo step 2\n")
    time.sleep(1)

    output += session.recv(65535)

I'm try execute more commands on my linux server, the problem is my python code not wait to finish execute command, for example if I'm try to execute "sleep 30", the python not wait 30 seconds for finish execute commands, how can resolve this problem ? I'm try whit while recv_ready() bat not wait :(

回答1:

Use exec_command: http://docs.paramiko.org/en/1.16/api/channel.html

stdin, stdout, stderr = ssh.exec_command("my_long_command --arg 1 --arg 2")

The following code works for me:

from paramiko import SSHClient, AutoAddPolicy
import time
ssh = SSHClient()
ssh.set_missing_host_key_policy(AutoAddPolicy())
ssh.connect('111.111.111.111', username='myname', key_filename='/path/to/my/id_rsa.pub', port=1123)
sleeptime = 0.001
outdata, errdata = '', ''
ssh_transp = ssh.get_transport()
chan = ssh_transp.open_session()
# chan.settimeout(3 * 60 * 60)
chan.setblocking(0)
chan.exec_command('ls -la')
while True:  # monitoring process
    # Reading from output streams
    while chan.recv_ready():
        outdata += chan.recv(1000)
    while chan.recv_stderr_ready():
        errdata += chan.recv_stderr(1000)
    if chan.exit_status_ready():  # If completed
        break
    time.sleep(sleeptime)
retcode = chan.recv_exit_status()
ssh_transp.close()

print(outdata)
print(errdata)

Please note that command history cannot be executed with ssh as is. See example here: https://superuser.com/questions/962001/incorrect-output-of-history-command-of-ssh-how-to-read-the-timestamp-info-corre

来源：https://stackoverflow.com/questions/34181078/python-paramiko-wait-to-finish-execute-command