IN A NUT SHELL
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Migrating between version managers for programming languages often involves a thorough cleanup of the old system to avoid conflicts.
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Proper configuration of environment variables and shell initialisation files is crucial for the new version manager to function correctly
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Troubleshooting path issues and ensuring the correct executables are being used is a common step after switching development environment managers.
Moving from RVM to RBENV is pretty straightforward but here are some gotcha’s I ran into migrating my two system.
First: rvm implode
rvm implode
At least on my system I saw a bunch of permission errors while this was running. Solve this by manually destroying .rvm after rvm implode finishes.
Second: clean up left overs
sudo rm -rf ~/.rvm
sudo rm -rf ~/.rvmrc
sudo rm -rf /etc/rvmrc
Third: remove gems
I wanted to make sure I didn’t have anything kicking around from the old version so I removed all the gems.
sudo gem list | cut -d" " -f1 | xargs sudo gem uninstall -aIx
For older gem versions you might need to loose the lx options and run more than once
sudo gem list | cut -d" " -f1 | xargs sudo gem uninstall -a
Fourth: install RBENV
On my system ~/.profile is my bash profile. This might be different on your system. Do a ls -la and look for .profile, .bash_profile, .bash_rc - something like that.
cd
git clone git://github.com/sstephenson/rbenv.git .rbenv
Then add this to the bottom of your ~/.profile
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
Quit and restart terminal
Fifth: install ruby-build and add you rubies
git clone git://github.com/sstephenson/ruby-build.git
cd ruby-build
./install.sh
Install a Ruby version and set it to be the default
rbenv install 1.9.3-p0
rbenv local 1.9.3-p0
rbenv rehash
Now’s a good time to also update your ruby-gem to the latest
sudo gem update --system
Check to make sure you’re actually using rbenv
> which ruby
/Users/wiseleyb/.rbenv/shims/ruby
> which irb
/Users/wiseleyb/.rbenv/shims/irb
> which rails
/Users/wiseleyb/.rbenv/shims/rails
If things aren’t pointing where you expect try removing the /usr/bin/whatever that’s misbehaving. Reinstalling. Restarting terminal. Rechecking. This at least worked for problems I had with rails. Which I solved by:
sudo rm /usr/bin/rails
sudo gem install rails
# reload bash
. ~/.profile
