Troubleshoot gem install "FilePermissionError" with rbenv

issue

% gem install serverspec
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.


cause

It might be because you are running ruby used by the system, thus do not have enough permissions.


resolution

A safe way is to use rbenv to install ruby yourself and use it.

% brew install rbenv ruby-build

List the versions:

% rbenv versions
* system (set by /Users/tomo/.rbenv/version)

% rbenv install -l
2.5.9
2.6.7
2.7.3
3.0.1
jruby-9.2.17.0
...

Installation takes some time.

% rbenv install 3.0.1

Switch to the version you have just installed.

% rbenv versions     
* system (set by /Users/tomo/.rbenv/version)
  3.0.1
% rbenv global 3.0.1
% rbenv versions    
  system
* 3.0.1 (set by /Users/tomo/.rbenv/version)

Set PATH.

% ruby -v
ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin20]
% export PATH=${HOME}/.rbenv/versions/3.0.1/bin:${PATH}
% ruby -v                                              
ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x86_64-darwin20]

Try again to confirm.

% gem install serverspec
> ok


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