Pjotr Prins wrote:
I think the only sensible alternative is a special NIX path for this
type of effect. E.g. /var/lib/nix/gems and
/usr/lib/nix/ruby/site-config.

/var/lib/nix/aliens/gems ? ... "Aliens", a name we thought of for these things in GoboLinux. (not implemented yet, but I think the idea was that things in the GoboLinux store (/Programs) could also depend on things in /System/Aliens, because Gobo isn't so interested in being pure)

obviously, we would need a system-wide path for them as long as they provide system-wide installation. Should the directory be versioned (though not in /nix/store), so that different versions of Ruby use different 'gems' directories? (can use? must use?) In any case I install that kind of thing (Cabal packages..) in my home directory without root privileges, so I don't care what Nix does with the default global installation location.

-Isaac
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