Problems with the rails console, RVM and readline

Question

I\'ve installed rvm as a way of making sure that my local development version of ruby is the same as my server\'s for a particular app i work on (ruby 1.8.7). I\'ve done th

Answer 1

I had a similar problem it was with 1.9.2 on Ubuntu 10.04, but the symptoms were identical. In order to get it to work:

rvm pkg install readline

or prior to RVM version 1.6.32, you need the following command

rvm package install readline

Then:

apt-get install ncurses-dev

And then taking from their instructions at http://rvm.beginrescueend.com/packages/readline/

cd $HOME/.rvm/src/ruby-1.9.2-p0/ext/readline
ruby extconf.rb -- --with-readline-dir="$HOME/.rvm/usr"
make install

I had actually done a system rvm install on the server, so I needed to do this:

cd $HOME/.rvm/src/ruby-1.9.2-p0/ext/readline
ruby extconf.rb -- --with-readline-dir="/usr/local/rvm/usr"
make install

After that I was able to have full access to the console.

Answer 2

Run the command

rvm requirements

It shows the requirements and dependencies. Install those and reinstall the ruby on rvm

rvm remove 1.9.2
rvm install 1.9.2

It works!

Answer 3

Tried gem install rb-readline

Still did not work. So started irb and did a require readline. The error message helped.

    Readline was unable to be required, if you need completion or history install readline then reinstall the ruby.
You may follow 'rvm notes' for dependencies and/or read the docs page https://rvm.io/packages/readline/ . Be sure you 'rvm remove X ; rvm install X' to re-compile your ruby with readline support after obtaining the readline libraries.
1.9.3p327 :001 > require 'readline'
LoadError: /usr/local/lib/libreadline.so.6: undefined symbol: UP - /home/sudhir/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/x86_64-linux/readline.so
    from /home/sudhir/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /home/sudhir/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from (irb):1
    from /home/sudhir/.rvm/rubies/ruby-1.9.3-p327/bin/irb:16:in `<main>'
1.9.3p327 :002 > ^[[6^[[A^[[A^[[B^C^C

So the problem in my case was all the libreadline* in /usr/local/lib. I had installed readline from source code and that was messing it up.

Followed the instructions here to fix it. http://vkarthickeyan.wordpress.com/2012/02/16/mysql-symbol-lookup-error-usrlocalliblibreadline-so-6-undefined-symbol-up/

Answer 4

I got same problem and solved it. I check http://rvm.beginrescueend.com/packages/readline/ Please check follow 2 things:

1. sudo aptitude install libreadline5-dev libncurses5-dev use libreadline6-dev, if you have a new version.
2. ruby extconf.rb -- --with-readline-dir='/home/youruser/.rvm/usr/include/readline' make sure you have the readline lib files under the with-readline-dir you pointed.

Answer 5

Have you trying this tutorial to use the readline install by brew ?

http://blog.plataformatec.com.br/2010/05/accented-chars-in-irb-with-rvm-and-ruby-1-8-7/

Answer 6

Readline was unable to be required, if you need completion or history install readline then reinstall the ruby.
You may follow 'rvm notes' for dependencies and/or read the docs page https://rvm.io/packages/readline/ . Be sure you 'rvm remove X ; rvm install X' to re-compile your ruby with readline support after obtaining the readline libraries.

If you follow that link, you will find some instructions on how to fix this problem. What worked for me was the first step, removing all the manually installed packages:

 $ rm -rf $rvm_path/usr

and then

$ rvm requirements
$ rvm reinstall 1.9.3

Hope it works!