needed help in ruby script where user interaction is necessary?

wrapster · 08-06-2008, 10:55 PM

Hi all,

I am struck at this point and needed some help in ruby
I wanted to write a script that accepts the no of VNICs the user wants to create and
then ask for the name of each Vnic he wants
then use these names to create the corresponding Vnics

Eg: suppose that there are 2 Vnics to be created
Then the user should be asked for the names of these and upon entering the names the corresponding ones are created

PS: this is actually a part of the wrapper script that i am struck with!
The command to create the Vnic is already present(in solaris,Crossbow) i just need to know how to include the names provided by the user into the command so that the job is done!

This is what i came up with

Code:

#!/usr/bin/ruby

class Etherstub
   def initialize
      @estub ; @stub_name
      @vni
   end

def ether_create
    puts "enter the no of stubs you want"
    @estub = gets ;puts "Enter the names 1 by 1 "
    @estub.to_i.times {|@stub_name| ;@stub_name = gets }
       @estub.to_i.times { puts `/usr/sbin/dladm create-etherstub #{@stub_name}
` }
print "Stub created!!"
end
end

first = Etherstub.new
first.ether_create

This is the error i get

Code:

enter the no of stubs you want
2
Enter the names 1 by 1 
etherstub1
etherstub2

/usr/sbin/dladm: etherstub creation failed: object already exists

This is only creating 1 stub that too etherstub2 and not etherstub1
(I have checked it out)
I would like to know where am going wrong?

Thanks

jlliagre · 08-07-2008, 01:37 AM

What happens if you run:

Code:

/usr/sbin/dladm create-etherstub etherstub1
/usr/sbin/dladm create-etherstub etherstub2

?

wrapster · 08-07-2008, 02:46 AM

it works perfectly!
in the shell there is no problem
but only while implementing it through ruby am facing this issue!

jlliagre · 08-07-2008, 04:33 AM

What shows your code when modified as this (echo added) ?

Code:

@estub.to_i.times { puts `echo /usr/sbin/dladm create-etherstub #{@stub_name}` }

wrapster · 08-07-2008, 06:56 AM

Code:

enter the no of stubs you want
2
Enter the names 1 by 1 
etherstub1
etherstub2
/usr/sbin/dladm create-etherstub etherstub2
/usr/sbin/dladm create-etherstub etherstub2
Stub created!!bash-3.2#

This is what i get!
By the look of its working fine,inst it?

jlliagre · 08-07-2008, 08:01 AM

It is not. It tries to create etherstub2 twice.

wrapster · 08-07-2008, 08:10 AM

yeah i know i figured out that after i wrote the mail!!!
And apparently if i choose to enter 3 stubs then the only stub being created is etherstub3 and so on....
What could be the reason?

jlliagre · 08-07-2008, 08:51 AM

Quote:

Originally Posted by wrapster

What could be the reason?

You stubbornly insisting using ruby while shell scripting is so easy ...

jlliagre · 08-07-2008, 09:25 AM

Alternatively, you can fix your script that way:
replace

Code:

    @estub.to_i.times {|@stub_name| ;@stub_name = gets }
       @estub.to_i.times { puts `/usr/sbin/dladm create-etherstub #{@stub_name}
    '}

by

Code:

    @estub.to_i.times {|@stub_name|
        @stub_name = gets
        puts `/usr/sbin/dladm create-etherstub #{@stub_name}`
    }

wrapster · 08-07-2008, 11:35 PM

the point here in not of being stubborn but just a matter of later conveniency ....
Planning on framing a GUI once the console stuff are sorted out so i decided to go in for RUBY!

wrapster · 08-08-2008, 01:50 AM

Oh cool,
Its working
thanks for your help !
But i would really love to know of any books that gives me a detailed desc of all these.
I do have "beginning ruby" by peter cooper..
But i the input and outputs are not that clearly described!!
This is the only part that i am not too comfortable with so could you specify any good tutorials where i can learn how to code for a user interaction scenario?

Thanks