Prefer that require/require_relative/load to tell us permission error if the target file is unreadable
We've ever met a situation that read-permissions of files in released google-api-client gem were lost as:
$ ls -l ~/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/google-api-client-0.8.3/lib/google -rw-r----- 1 sonots sonots 27249 March 24 18:32 2015 api_client.rb
The error message was
in `require': cannot load such file -- api_client.rb (LoadError)
At that time, it took 30 minutes for me to find the reason why we get LoadError with the gem because the file exists.
I looked the source codes load.c, and finally I found the reason as it is because of permission with my intuition.
What I Want¶
require tells us PermissionError in addition to LoadError, I could figure out the reason soon.
I think the additional information is helpful for finding such issues.