RubyGems installation errors when using 'sudo' or not

Posted by Kenny Peng on Stack Overflow See other posts from Stack Overflow or by Kenny Peng
Published on 2010-04-21T16:40:15Z Indexed on 2010/04/21 16:43 UTC
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ruby

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rubygems

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installation

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error

I have a machine that is running Ubuntu Hardy, which provides its own RubyGems package. Unfortunately that version of RubyGems (1.1.1) is too old to do anything useful with, so I decided to manually update RubyGems to the current version (1.3.6). That part went smoothly, and if I do gem -v, I get 1.3.6 which is expected. The problem is when I try to do: sudo gem install rack, it returns this error:

ERROR:  While executing gem ... (Errno::EACCES)
Permission denied - /home/username/.gem

Usually when I install gems as root, it knows to install it into /usr/lib/ruby/gems, so why is it checking my home directory at all? Another quirk is when I do gem install rack (not as root), it says:

ERROR:  While executing gem ... (Gem::FilePermissionError)
You don't have write permissions into the /usr/lib/ruby/gems/1.8 directory.

which is where I want it to go. I've already tried clearing source_caches, trying different versions of RubyGems (1.3.5), forcing installation into /usr/lib with -i to no avail. Any ideas on why RubyGems is so insistent on checking my /home directory when installing as root?

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