Installing gem fails with permissions error [dupli

问题:

This question already has an answer here:

• Installing gem or updating RubyGems fails with permissions error 25 answers

I updated my Mac OS to 10.9 Mavericks yesterday. My current Ruby version shows as

ruby 2.0.0p247 (2013-06-27 revision 41674) [universal.x86_64-darwin13]

I got Rails installed on my machine and when I try to install gems I get the following message:

Fetching: eventmachine-1.0.3.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.

I am trying all this in my home directory. Any suggestions?

回答1:

Use a Ruby version manager, like RVM or rbenv.

I can't speak for rbenv, but RVM prepends a Ruby version-specific bin to your PATH that you have access to, so you don't have to use sudo (which is how you could install gems in your current situation, but is highly discouraged).

rbenv similarly prepends to your $PATH, but it uses a shim.

回答2:

When I had this same error it was because I did not have a Ruby version manager installed, it defaulted to the Ruby version that came shipped with my computer which is owned root.

Since it is a very bad idea to use sudo to install gems, I installed RVM with Ruby 2.1.2

\curl -sSL https://get.rvm.io | bash -s stable --ruby=2.1.2

then made sure that it was being used as the default by running

rvm use ruby-2.1.2

RVM creates a new location to store your Ruby and gems with your user permissions so you don't have to use sudo or get a permissions error. The new gem location is:

~/.rvm/gems

Then carry on as you were...

gem install ....

回答3:

I do not have RVM installed. I got this error because I installed rbenv but did not run rbenv init yet.

After I inserted the contents from the command rbenv init into .bash_profile, gem install works as expected.

I also happened to set rbenv global <ruby-version> to a downloaded Ruby version first.

回答4:

Just like to say to you all after wasting a good hour or more on trying to install RubyGems... to rubygems-2.4.5 'sudo' got me through! It works a treat...