[python] Running interactive commands in Paramiko

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(server_IP,22,username, password)


stdin, stdout, stderr = ssh.exec_command('/Users/lteue/Downloads/uecontrol-CXC_173_6456-R32A01/uecontrol.sh -host localhost ')
alldata = ""
while not stdout.channel.exit_status_ready():
   solo_line = ""        
   # Print stdout data when available
   if stdout.channel.recv_ready():
      # Retrieve the first 1024 bytes
      solo_line = stdout.channel.recv(1024) 
      alldata += solo_line
   if(cmp(solo_line,'uec> ') ==0 ):    #Change Conditionals to your code here  
     if num_of_input == 0 :
      data_buffer = ""    
      for cmd in commandList :
       #print cmd
       stdin.channel.send(cmd)        # send input commmand 1
      num_of_input += 1
     if num_of_input == 1 :
      stdin.channel.send('q \n')      # send input commmand 2 , in my code is exit the interactive session, the connect will close.
      num_of_input += 1 
print alldata
ssh.close()              

Why the stdout.read() will hang if use dierectly without checking stdout.channel.recv_ready(): in while stdout.channel.exit_status_ready():

For my case ,after run command on remote server , the session is waiting for user input , after input 'q' ,it will close the connection . But before inputting 'q' , the stdout.read() will waiting for EOF,seems this methord does not works if buffer is larger .

  • I tried stdout.read(1) in while , it works
    I tried stdout.readline() in while , it works also.
    stdin, stdout, stderr = ssh.exec_command('/Users/lteue/Downloads/uecontrol')
    stdout.read() will hang