From: "Ara.T.Howard" <ahoward@...>
Date: 2004-04-15T12:09:12+09:00
Subject: Re: ruby pty/expect help

On Thu, 15 Apr 2004 nobu.nokada@softhome.net wrote:

> Hi,
> 
> At Thu, 15 Apr 2004 01:09:20 +0900,
> Ara.T.Howard wrote in [ruby-talk:97152]:
> > ~/eg/ruby > ruby ssh-keygen.rb 
> > Generating public/private rsa key pair.
> > Enter file in which to save the key (/home/ahoward/.ssh/id_rsa): id_rsa
> > Enter passphrase (empty for no passphrase): 
> > Enter same passphrase again: ssh-keygen.rb:22:in `read': Input/output error - /dev/pts/19 (Errno::EIO)
> >         from ssh-keygen.rb:22
> >         from ssh-keygen.rb:8:in `spawn'
> >         from ssh-keygen.rb:8
> > 
> > 
> > without the read it generates the expected output, but no id_rsa file is
> > produced and no error is given...  doesn't the call to IO.expect do the reading
> > anyhow?  also, the example in ext/pty/example_expect.rb doesn't seem to do any
> > reading either?
> 
> Because the watchdog thread created by PTY.spawn signals the main thread
> when child exits, and read(2) is interrupted.  In such case, however, I feel
> that IO#read should return already read data, if exists.


perhaps a handle on an object which can be 'closed' could be returned instead
of an array of Files, etc:

  passphrase = gen_random_passphrase

  pty = PTY.spawn 'ssh-keygen'

  pty.stdin.puts 'id_rsa.pub' 
  pty.stdin.puts passphrase
  pty.stdin.puts passphrase
  pts.close  # do the right thing

  pty = PTY.spawn 'ssh-agent'

  pty.stdin.write passphrase

  ...


> BTW, you don't need PTY at all to generate ssh key
> automatically.

see above - i want to pass it to ssh-agent.  thanks though, didn't know
that...

-a
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