I am just starting to learn ruby. It seems that the default gems install path is not part of Ruby. Is this normal behavior? How can I set the default ruby path? Example:
[11:53:33]wuntee:/Library/Ruby/Gems/1.8/gems/packetfu-1.0.0/examples$ sudo ruby arphood.rb
Fetching the oui.txt from IEEE, it'll be a second. Avoid this with arphood.rb <filename>.
arphood.rb:30:in `require': no such file to load -- packetfu (LoadError)
from arphood.rb:30:in `arp_everyone'
from arphood.rb:51
As you can see packetfu is installed in /Library/Ruby/Gems/1.8/gems/, but ruby cant find it...
that's because you're not in the directory where packetfu.rb file lies and there's no require 'rubygems' to add the gems paths in your script
Related
I'm new to ruby. I removed ruby 1.9 with sudo apt-get purge ruby and then
I installed ruby 2.3.0 using ruby-install. But I got the following error
<internal:gem_prelude>:4:in `require': cannot load such file -- rubygems.rb (LoadError)
from <internal:gem_prelude>:4:in `<internal:gem_prelude>
when running rspec my_script.rb.
Still can't fix this after googling! Anyone can help me out?
It seems that the rspec binary was only installed for your previous ruby version. Therefore it is found, but not guaranteed to work.
I'd recommend to use something like rvm (https://rvm.io/) or rbenv (https://github.com/rbenv/rbenv). Both of them can easily handle different ruby versions while maintaining dependencies (e.g. different load paths, different gem versions, etc.). I'd even use rvm if there is only one single ruby version installed on a system.
I am trying to include the ruby-mysql gem in my ruby script. I have installed the gem using bundler but when I run bundle exec ./mysql_connector, I receive the error ./mysql_connector:4:in ``require': cannot load such file -- ruby-mysql (LoadError). Can you please help me troubleshoot what the problem is?
What I did
Installed rails in my home directory.
I do not have root access to the server so I have installed rails in my local directory by following the instructions here:
http://www.r-bloggers.com/installing-ruby-on-linux-as-a-user-other-than-root/
Created a directory for my application.
My application resides in my home directory in a folder called connector. It has a Gemfile that looks like this:
source 'https://rubygems.org'
gem 'ruby-mysql'
Call bundle install.
Using ruby-mysql 2.9.14
Using bundler 1.11.2
Bundle complete! 1 Gemfile dependency, 2 gems now installed.
Bundled gems are installed into ./vendor/bundle.
Add dependencies to my script. My script is in connector/mysql_connector and it reads:
#!/home/dcox/bin/ruby
require 'rubygems'
require 'bundler/setup'
require 'ruby-mysql'
Make script executable. I saw that you need to run bundle exec using an executable file, so I followed the instructions here to make my script executable: http://commandercoriander.net/blog/2013/02/16/making-a-ruby-script-executable/
Run the script. I execute using bundle exec mysql_connector and see:
/home/dcox/bin/mysql_connector:4:in `require': cannot load such file -- ruby-mysql (LoadError)
from /home/dcox/bin/mysql_connector:4:in `<main>'
Is it the $LOAD_PATH? After searching around for answers, I discovered a lot of SO answers as well as a blog post (https://codedecoder.wordpress.com/2013/09/23/require-and-load-in-ruby-loaderror-cannot-load-such-file/) that seem to suggest the problem is that the gem is not installed in a directory on the $LOAD_PATH. Here is what I see when I run $LOAD_PATH from IRB:
irb(main):002:0> $LOAD_PATH
=> ["/home/dcox/lib/ruby/site_ruby/2.1.0",
"/home/dcox/lib/ruby/site_ruby/2.1.0/x86_64-linux",
"/home/dcox/lib/ruby/site_ruby", "/home/dcox/lib/ruby/vendor_ruby/2.1.0",
"/home/dcox/lib/ruby/vendor_ruby/2.1.0/x86_64-linux",
"/home/dcox/lib/ruby/vendor_ruby", "/home/dcox/lib/ruby/2.1.0",
"/home/dcox/lib/ruby/2.1.0/x86_64-linux"]
Next I checked to see the location of ruby-mysql:
dcox#analytics1:~/connector$ bundle show ruby-mysql
/data/home/dcox/connector/vendor/bundle/ruby/2.1.0/gems/ruby-mysql-2.9.14
Obviously my connector/vendor/bundle path is not on the $LOAD_PATH. I could add it, but I have a feeling I am missing something simple here because bundler is supposed to work as long as you follow the instructions, right?
Any advice or help is very much appreciated! Thanks!!
If you just want to require this specific gem, require 'mysql' should work (e.g., https://github.com/tmtm/ruby-mysql/blob/master/test/test_mysql.rb#L10).
Your file should call Bundler.setup http://bundler.io/bundler_setup.html
Better yet, if you instead call Bundler.require(:default) it will setup and require all the gems in your Gemfile for you.
I’m running on Mac OS X Yosemite 10.10 Beta 3, I did a fresh install of rvm (removed everything I could think of and reinstalled the whole thing.
Attempting to run a scripts I had working on Mavericks.
Maxims-MacBook-Air:AppleSampleCodeWorker maximveksler$ gem install restclient
Successfully installed restclient-0.10.0
Parsing documentation for restclient-0.10.0
Done installing documentation for restclient after 0 seconds
1 gem installed
Maxims-MacBook-Air:AppleSampleCodeWorker maximveksler$ which irb
/Users/maximveksler/.rvm/rubies/ruby-2.1.2/bin/irb
Maxims-MacBook-Air:AppleSampleCodeWorker maximveksler$ irb
2.1.2 :001 > require 'restclient'
LoadError: cannot load such file -- restclient
from /Users/maximveksler/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/maximveksler/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from (irb):1
from /Users/maximveksler/.rvm/rubies/ruby-2.1.2/bin/irb:11:in `<main>’
Path looks normal
Maxims-MacBook-Air:AppleSampleCodeWorker maximveksler$ env | grep GEM
GEM_HOME=/Users/maximveksler/.rvm/gems/ruby-2.1.2
GEM_PATH=/Users/maximveksler/.rvm/gems/ruby-2.1.2:/Users/maximveksler/.rvm/gems/ruby-2.1.2#global
Also the gem is installed
Maxims-MacBook-Air:AppleSampleCodeWorker maximveksler$ file /Users/maximveksler/.rvm/gems/ruby-2.1.2/gems/restclient-0.10.0/lib/rest_client.rb
/Users/maximveksler/.rvm/gems/ruby-2.1.2/gems/restclient-0.10.0/lib/rest_client.rb: ASCII C++ program text
So what am I missing ?
Looking at your link here, there is an error in your syntax. It should be require 'rest_client' rather than require 'restclient'. The reason that your version still works is as you said because there is a file called restclient.rb which is used as the source for the additional restclient binary that the gem supplies (which is against regular naming convention, you should file an issue with the github).
Now because you require this file (restclient.rb) which is used to set up an environment that already has RestClient available, it is effectively the same as requiring rest_client. It may however have unintended consequences so you should probably stick to the convention outlined in the documentation.
This is all from reading the documentation here and glancing at the files here. Does that make sense? I worried it was unclear as the two files are very similar.
I'm new to Ruby. I have a .bundle file. I put it in the source folder and did
require('my.bundle')
But when I call the methods in the bundle, the definition is not found. Do I have to install them or include them in some other way to access them?
I am on Ruby version 1.8.7 (latest version on Mac).
I highly recommend using RVM to manage your Ruby installation, including your gems, so if you don't already have that, get it and follow the instructions for installing it. Make sure you do the part about modifying your bash startup script or you'll see weird behavior, like the wrong Ruby being called. Also, use the steps in "RVM and RubyGems" to install your gems or you can run into weird behavior with gems being installed under the wrong or an unexpected Ruby.
Second, use the gem command to install gems:
gem install gem_to_install
replacing "gem_to_install" with the name of the gem you want, and it will be installed into the appropriate gem folder for your Ruby.
If you are on Ruby 1.92, and trying to require a gem to use as a module in your code, use:
require 'gemname'
if it is installed via the gem command. And, if it is a module you wrote or have in your program's directory or below it, use:
require_relative 'path/to/gem/gemname'
If you are on a Ruby < 1.9 you'll also need to add require 'rubygems' above your other require lines, then use require './path/to/gem/gemname'.
Thanks, but my .bundle is not in gems. How do I install/require a .bundle file I already have?
If you wrote it look into rubygems/gemcutter or bundler for info on bundling and managing gems.
You can install a gem without using the app by going into the directory containing the gem and running setup.rb. See http://i.loveruby.net/en/projects/setup/doc/usage.html for a decent writeup or the official docs at: http://docs.rubygems.org/read/chapter/3
I'm trying to run a ruby file which imports a gem. The ya2yaml gem is installed, yet somehow it is not found:
$ cat delme.rb
require 'rubygems'
require 'ya2yaml'
$ ruby delme.rb
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- ya2yaml (LoadError)
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
from delme.rb:2
I installed the gem using: sudo gem install ya2yaml and I know that the gem is actually installed:
$ gem list --local | grep ya2yaml
ya2yaml (0.26)
Also, the following works from a rails program I just downloaded:
sudo rake gems
However the following fails:rake gems
Which leads me to think that there may be a permissions problem somewhere.
Why can't the gem be found? What can I do to diagnose this?
Thanks!
The thing I would do in a situation like this:
Search for the gem's location on your system. Use this command:
find / -name ya2yaml
Check that the found directory is added to your PATH system variable by doing this:
echo $PATH
If the path where ya2yaml gem is located is not listed in the PATH variable's value, add it:
PATH=$PATH:/gem/location/directory
export PATH
I hope you'll find these steps helpful. Good luck!
Instead of require 'rubygems' inside delme.rb, try starting ruby with -rubygems:
$ ruby -rubygems delme.rb
I've certainly seen this error before. Unfortunately I don't know what causes it. I do know that if you see it on Linux and you've installed gem via your package manager (synaptic / yum / etc) then you can generally fix it by installing gem by hand from their website. The instructions there are pretty straight-forward.
(Your command line looks unix-y, so it seems to me that you may be on Linux. If you're on a Mac, it's certainly worth trying anyway.)
UPDATE: Linux, then. Ta.