[rancid] Problem with custom device script

[Brian Talley]

On Sat, Apr 9, 2011 at 11:59 AM, john heasley <heas at shrubbery.net> wrote:

> Fri, Apr 08, 2011 at 02:25:07PM -0600, Brian Talley:
> > I'm creating a custom login script for a Crescendo load balancer device.
>  I
> > can log in to the device and get to interactive mode ok using the script,
> > but when I try to run commands with something like:
> >
> > crescendologin -d -t 30 -c"show running" host
> >
> > it appears that expect is trying to match on every character with output
> > like:
> >
> > ...
> > send: sending "show running\r" to { exp6 }
> >
> > expect: does "" (spawn_id exp6) match regular expression "^[^\n\r]*root>
> "?
> > no
> > "^[^\n\r ]*>>.*root> "? no
> > "[\n\r]+"? no
> >
> > expect: does "s" (spawn_id exp6) match regular expression "^[^\n\r]*root>
> "?
> > no
> > "^[^\n\r ]*>>.*root> "? no
> > "[\n\r]+"? no
> > expect: timed out
> >
> > Error: TIMEOUT reached
> >
> > I feel like I'm missing something obvious.  The pertinent section of
> > run_commands looks like:
> >
> >     for {set i 0} {$i < $num_commands} { incr i} {
> >         send -- "[subst -nocommands [lindex $commands $i]]\r"
> >         expect {
> >                 -re "^\[^\n\r]*$reprompt"      { exp_continue }
> >                 -re "^\[^\n\r *]*$reprompt"     {}
> >                 -re "\[\n\r]"                   { exp_continue }
> >         }
> >     }
> >
> > And the actual prompt is "root> "
>
> try ktrace (or truss or strace) on the process.  it could be that the
> device is slow, the expect (tcl) is reading one char at a time, the
> tty is in a weird mode; as just a few guesses.
>
> it is not uncommon for single chars to be read sometimes.  the key is
> create matches that dont consume the single chars; cause it to read
> more and concatenate the input into complete lines.
>
>
After some trial and error I was able to get this to work by using

set send_human {.1 .3 1 .05 2}

Thanks,
Brian
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