[SOLVED] What is the appropriate directory of permanent cache files wrote within rubygems (like unix's /var)?

What is the appropriate directory of permanent cache files wrote within rubygems (like unix's /var)?

I am developing a rubygem, which bundle a simple CLI.

The CLI will make a web server request and cache part of its response to a text file.

But, in development, I couldn't find appropriate place to store the response cache (I did some google search). I simply placed it in the "var" directory on gem's root. But I don't think gem's root is a good place for cache files.

tmpdir is good for temporary cache files, but I want to store cache permanently.

Are there any better practice on directory path for such cache files?

Solution

As you probably do not want users to share cached content (and because of other security concerns), I would put it in /home/$USER/.$GEMNAME/cache (e.g. /home/yukihr/.awesomecli/cache). I do not know nothing about Windows or Mac OS, but I am sure there is a clean, portable way to access the user's home directory and place a hidden folder there.