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Date: Sat, 8 Nov 2014 18:22:30 +1100
From: Duncan Roe <duncan_roe AT acslink DOT net DOT au>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 1.7.33-0.5
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On Wed, Nov 05, 2014 at 06:23:54PM +0000, Habermann, David (D) wrote:
> > I just released a 5th TEST version of the next upcoming Cygwin release,
> > 1.7.33-0.5.
>
> Ever since using this 1.7.33-0.x series (currently running 1.7.33-0.5) I've
> been having intermittent trouble with one of my scripts, and just finally got
> around to digging further today.  This is an expect script (subroutine of a
> larger system) designed to auto-login to an ssh session and then set the
> passwd -R to allow further ssh sessions to have "full network powers". (I then
> run a cron script which drops these rights off again every half-hour, so the
> "full network powers" logins are time limited.)
>
> The symptoms of the failure are that it sometimes fails to send the ssh
> password (and thus doesn't proceed to the passwd -R command at all).  If I run
> the script a second time, it almost always works on the second try. After some
> time has passed I run it again and get a failure, then immediately run again
> and succeed.  I would appreciate any thoughts as to why such a script would
> fail, and then succeed on successive runs.  This routine basically never
> failed on the previous recent versions of cygwin (in active daily use since
> approximately July 1st).
> >
> > Dave
> >
> >
> > The script is called like this:
> >
> > $ super.exp localhost mypasswd
> >
> > and the file super.exp looks like this:
> >
> #!/usr/bin/expect
>
> set mach [lindex $argv 0]
> set pass [lindex $argv 1]
>
> spawn ssh -o PubkeyAuthentication=no $mach
> expect -exact "password: "
> send $pass\n
> expect {
>         "$ " {
>                 send "passwd -R\n"
>                 expect -exact "password: "
>                 send $pass\n
>                 expect -exact "password: "
>                 send $pass\n
>                 expect -exact "$ "
>                 send "exit\n"
>                 interact
>         }
>         "Permission denied, please try again." {
>                 send_error "The password you provided was invalid.\n"
>                 exit 1
>         }
> }
>
I would try "set exp_internal 1" and capture the output somewhere. There
shouldn't be too much for a script this size. You should see the exact failure
point quite easily.

Cheers ... Duncan.

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