Solved

Ruby error

Posted on 2011-09-06
8
452 Views
Last Modified: 2012-05-12
I'm getting the following error message when trying to run a ruby script.  I listed the beginning of the script for reference.  Please help.


<internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- exceptions (LoadError)
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from ./ssh_helpers.rb:6:in `<main>'

-------------------------SCRIPT IS BELOW-------------------------------------

#!/usr/bin/env ruby
require 'rubygems'
require 'open4'
require 'socket'

require 'exceptions'


0
Comment
Question by:johncosentino
  • 4
  • 3
8 Comments
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36489058
Its this line that's causing the issue:

require 'exceptions'

What are you trying to require? is this a gem or a separate ruby file?

Andrew
0
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36489064
To Clarify what the error message is, its trying to explain, it doesn't know what 'exceptions' is - it isn't an installed gem, nor is there an 'exceptions.rb' file in the same directory as this script
0
 

Author Comment

by:johncosentino
ID: 36489135
This is a separate ruby file, and I confirmed that the exceptions.rb file is in the same directory as the script in question.
0
 

Author Comment

by:johncosentino
ID: 36490295
So I've found a fix, though I'm still not sure what causes the problem.

if you change the line in the script from require 'exceptions' to require_relative 'exceptions' the problem is resolved.

Apparently the "_relative" tells the script to look in the current directory?  
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36490326
The only thing I can think off, is that ruby is trying to use system call with it being 'exceptions'?
One other thing you could try would be to rename the file to 'my_exceptions.rb' and then
require 'my_exceptions'

By using _relative you're forcing ruby to check the current directory first.

0
 

Author Comment

by:johncosentino
ID: 36490361
This might be a stupid question, but why wouldn't it check the current directory first with just "require"....what does "require" check first?
0
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36490382
Are you running this script from within the directory its located?

Have you done something like this:
cd /ruby_files/
ruby test.rb

So when you run the ruby file, you're running it from the same directory?

or are you running it like this:
ruby ruby_files/test.rb
0
 
LVL 12

Accepted Solution

by:
JESii earned 500 total points
ID: 36492615
ruby sets up a number of directories that it looks in for locating files that are required.  You can see what that is on your system by typing:
   ruby -e 'puts $:'
(The $: is a global variable that contains the load paths for load / require expressions)

It's kind of a linux convention to not  automatically look in the current directory; this avoids the scenario where someone puts a malicious file in your current directory to has the same name as another command and therefore gets executed when you run that command. That's why in Linux (or Mac Terminal), you have to type:
   ./command_name
to run something from the current directory.

And that's why there's require_relative... to make it easier to access the current directory for loaded or required files.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Free Ruby on Rails hosting 4 524
Ruby problem with blocks 5 313
Rake errors while installing gitorious 10 716
Can't get video.js working with firefox 6 893
I recently rediscovered rails when I needed a holiday project and decided to build a management dashboard for the company where I work.  With it being a project done in my free time, I could focus my time on learning the basics rather than trying to…
Article by: narshlob
If you've ever programmed in Ruby and have come across either a proc or a lambda, you might have been wondering what the difference is between the two and when you would use one over the other. This article will try to explain the difference between…
When you create an app prototype with Adobe XD, you can insert system screens -- sharing or Control Center, for example -- with just a few clicks. This video shows you how. You can take the full course on Experts Exchange at http://bit.ly/XDcourse.
A short film showing how OnPage and Connectwise integration works.

914 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now