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I was trying to install Travis.rb as documented by the team. However, the location that gem tried to install to is protected by the OS. So I got an error like this:
% gem install travis
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.
I tried the following command but did not fully work - installation was okay, but I could not call % travis.
gem install travis --user-install
Configuration: I am using gem shipped with the OS:
% ruby -v
ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19]
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The interface for RubyGems is a command-line tool called gem which can install and manage libraries (the gems). RubyGems integrates with Ruby run-time loader to help find and load installed gems from standardized library folders.
By default, binaries installed by gem will be placed into: /usr/local/lib/ruby/gems/3.1. 0/bin You may want to add this to your PATH.
It is always a good idea to do user installation and avoid system things. Therefore doing...
gem install travis --user-install
... seems to be recommended way.
After that, the executable files are there, but you have to fix you PATH to run by adding your ~/.gem/ruby/2.6.0 folder to the path. See https://guides.rubygems.org/faqs/#user-install on how to do it.
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