I am trying to wrap my head around an issue here that has to do with running python without a tty. I use pexpect to connect to ssh and run some commands. However, if my script runs from a process which I forked using os.fork my pexpect spawn object can't open a good file descriptor in which to run my ssh command, as far as I can tell. pexpect uses pty.fork to fork the process, attach a tty, and run my command in the child with os.exec.
When I go to expect something on the spawn object the read on the fd of the child returns EOF, which indicates that the child's fd is already closed before I did anything. This is the point at which I am trying to make sense of things. pty.fork gave pexpect the child's fd but does that fd actually go to a tty? Does the fact that my use of pexpect happens in a process which is not running in a tty, as it was generated from os.fork? It looks like pty.fork tries to use os.forkpty but I am not sure how an existing tty plays in to getting a new tty for the child process... Any insight into os.fork and pty.fork would be great. Thanks. -eric -- http://mail.python.org/mailman/listinfo/python-list
