Paramiko SSH exec_command (shell script) returns before completion

Question

I launch a shell script from a remote Linux machine using Paramiko. The shell script is launched and execute a command make -j8. However the exec_command returns before the completion of the make.

If I launch the script on the local machine it executes correctly.

Could someone explain me this behaviour?

deft_code · Accepted Answer · 2010-07-09 19:14:56Z

30

You need to wait for application to finish, exec_command isn't a blocking call.

print now(), "before call"
stdin, stdout, sterr = ssh.exec_command("sleep(10)")
print now(), "after call"
channel = stdout.channel
print now(), "before status"
status = channel.recv_exit_status()
print now(), "after status"

edited Jul 9, 2010 at 19:14

answered Jul 9, 2010 at 19:07

deft_code

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2 Comments

sliders_alpha Over a year ago

weirdly, using stdout.channel.recv_exit_status() blocks my code forever

Martin Prikryl Over a year ago

@sliders_alpha Indeed, while this answer is in principle correct, this simple implementation will hang/deadlock, if the command's output is sufficiently large. See Paramiko ssh die/hang with big output.

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