From: mpurdy <mpurdy1973usergroups@...>
Date: 2011-04-08T13:00:29+09:00
Subject: reading and writing to child process with streams in ruby

i am trying to fork a process to run a simple script which requires a
username and password.  i made a test case with a simple bash script
and a simple ruby script; however, the ruby script hangs in
stdout.read???

i am new to ruby, so i am assuming i am doing something wrong :-)  can
anyone help?

----------------------------------------------------------------------
bash script
----------------------------------------------------------------------
#! /bin/bash
sleep 3
echo -n "username: "
read -e USERNAME
echo -n "password: "
read -e PASSWORD
echo "running your script now for $USERNAME with password $PASSWORD"
echo 'doing something...'
sleep 3
echo 'end doing something...quiting'
exit 0

----------------------------------------------------------------------
ruby script
----------------------------------------------------------------------
require 'open3'

cmd = "./myScript.bash"
#cmd = "gpg --list-keys"
begin
   stdin, stdout, stderr = Open3.popen3 cmd
   done = 0
   until done == 1
      begin
         line = stdout.read
         print "#{line}"
         puts line.eql?("username: ")
         if line.eql?("username: ")
            puts "myuser"
            stdin.write "myuser\n"
            line = stdout.read
            if line.eql?("password: ")
               puts "mypassword"
               stdin.write "mypassword\n"
               done = 1

            end
puts "im here!"

         end

      end

   end

end