Rvm和rbenv环境变量冲突导致无法安装gem包

背景

root环境用rvm安装了ruby，但我需要在用户环境重装ruby，而且个人喜欢用rbenv，这就导致了我安装了rbenv的gem后，没有权限安装gem包。

resolve

这种情况是rvm强制设置了GEM_HOME导致的，可以gem env查看：

jason@mac:~$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 2.0.14
  - RUBY VERSION: 2.0.0 (2014-11-13 patchlevel 598) [x86_64-linux]
  - INSTALLATION DIRECTORY: /usr/local/rvm/gems/ruby-2.0.0-p353
  - RUBY EXECUTABLE: /home/jason/.rbenv/versions/2.0.0-p598/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/local/rvm/gems/ruby-2.0.0-p353/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /usr/local/rvm/gems/ruby-2.0.0-p353
     - /home/jason/.rbenv/versions/2.0.0-p598/lib/ruby/gems/2.0.0/
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - https://rubygems.org/

可见GEM PATHS里优先选择了rvm的gem路径，所以需要重设GEM_HOME

export GEM_HOME=$HOME/.rbenv/versions/2.0.0-p598/lib/ruby/gems/2.0.0/

但是，最好的办法是在~/.bash_profile(centos,ubuntu中是.bashrc)中eval "$(rbenv init -)"前加上：

unset GEM_PATH
unset GEM_HOME

这样也可以清除rvm的设置，使rbenv的变量被正确设置.

ruby
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