On Friday, January 18, 2013 9:30:29 AM UTC+5:30, MRAB wrote:
> On 2013-01-18 03:12, Steven D'Aprano wrote:
>
> > On Fri, 18 Jan 2013 10:49:30 +0800, douxin wrote:
>
> >
>
> >> i use Popen to execute "su -c 'fdisk -l'" in sub process,and
>
> >> assigned subprocess.PIPE to stdin,stdout i tried to enter password
>
> >> by doing "stdin.write("password"+"\n")" and i expected i could get
>
> >> the output of "fdisk -l" by doing "stdout.read()"
>
> >> it didn't work.
>
> >>
>
> >> will somebody tell me what is going on with that?
>
> >
>
> > Would you like us to guess what happened? I love guessing games!
>
> >
>
> > My guess is that it output "su: incorrect password", which means you have
>
> > the wrong password. Is that it?
>
> >
>
> > If not, my guess is that it output "fdisk: command not found", in which
>
> > case your system is broken and the fdisk binary is missing or not on the
>
> > PATH. Am I close?
>
> >
>
> > Last guess: you got a Python traceback with an error:
>
> >
>
> > NameError: name 'subprocess' is not defined
>
> >
>
> > You need to import the subprocess first.
>
> >
>
> >
>
> > If none of my guesses are correct, could we have some hints? Perhaps show
>
> > us the actual code you are using, and the actual results, copied and
>
> > pasted exactly.
>
> >
>
> It may, of course, be that for security reasons it won't accept a
>
> password from
>
> whatever happens to be connected to stdin, but instead insists that it's
>
> entered
>
> directly from the keyboard, if you see what I mean.
I think you are correct - su uses some tty magic to stop ECHO and probably
doesn't read the password from stdin.
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