From: Michael Glaesemann <grzm@...>
Date: 2006-11-12T23:28:30+09:00
Subject: gem query finds gem, yet require fails

I'm setting up a secondary machine to run tests. I've run into a  
problem with gems not being found. Everything works fine on my  
primary machine, and I haven't been able to tease out what the  
difference is in the two setups.

I've installed Ruby 1.8.5 and rubygems 0.9.0, both from source, on  
Mac OS X 10.4.8.
Ruby configuraiton:
$ ./configure --prefix=/usr/local

rubygems installation:
$ sudo /usr/local/bin/ruby setup.rb

I installed the PostgreSQL bindings gem using:
$ sudo gem install postgres

The bindings appeared to install correctly. Using gem query, I can see:


*** LOCAL GEMS ***

postgres (0.7.1)
     The extension library to access a PostgreSQL database from Ruby.

sources (0.0.1)
     This package provides download sources for remote gem installation

However, when testing with irb to see if the postgres gem can be  
found, I get:

$ which ruby
/usr/local/bin/ruby
$ which irb
/usr/local/bin/irb
$ irb
irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'postgres'
LoadError: no such file to load -- postgres
         from /usr/local/lib/ruby/site_ruby/1.8/rubygems/ 
custom_require.rb:27:in `gem_original_require'
         from /usr/local/lib/ruby/site_ruby/1.8/rubygems/ 
custom_require.rb:27:in `require'
         from (irb):2

I'm stumped. On my primary machine, the above two commands work just  
fine in irb.

Looking around custom_require.rb and seeing the private init_gemspecs  
method, I tried:
irb(main):006:0> gs = Gem::GemPathSearcher.new
...
irb(main):017:0> pp gs.send(:init_gemspecs)

I can see the postgres gem included in the list (relevant part of the  
output is posted below).

However, the find method fails:

irb(main):018:0> gs.find('postgres')
=> nil

The default dir appears to be correct:

irb(main):020:0> Gem.default_dir
=> "/usr/local/lib/ruby/gems/1.8"

In the shell:
$ ls -la /usr/local/lib/ruby/gems/1.8
total 4040
drwxr-xr-x    7 root  wheel      238 Nov 12 22:11 .
drwxr-xr-x    3 root  wheel      102 Nov 12 22:10 ..
drwxr-xr-x   11 root  wheel      374 Nov 12 22:24 cache
drwxr-xr-x   10 root  wheel      340 Nov 12 22:24 doc
drwxr-xr-x   11 root  wheel      374 Nov 12 22:24 gems
-rw-r--r--    1 root  wheel  2066469 Nov 12 22:12 source_cache
drwxr-xr-x   11 root  wheel      374 Nov 12 22:24 specifications

Any help would be appreciated. I've been staring at this for quite a  
while now and nothing new is coming to me. I don't have any GEM_*  
environmental variables or .gemrc files on either machine. Anything  
else I should try or check?

Thanks!

Michael Glaesemann
grzm seespotcode net

### partial init_gemspecs output
#<Gem::Specification:0x585ffc
   @authors=[],
   @autorequire="postgres",
   @bindir="bin",
   @cert_chain=nil,
   @date=Wed Oct 20 00:00:00 +0900 2004,
   @default_executable=nil,
   @dependencies=[],
   @email="noborus@netlab.jp",
   @executables=[],
   @extensions=["extconf.rb"],
   @extra_rdoc_files=[],
   @files=
    ["ChangeLog",
     "doc",
     "extconf.rb",
     "MANIFEST",
     "postgres-ruby.gemspec",
     "postgres.c",
     "README",
     "README.ja",
     "sample",
     "doc/postgres.html",
     "doc/postgres.jp.html",
     "sample/losample.rb",
     "sample/psql.rb",
     "sample/psqlHelp.rb",
     "sample/test1.rb",
     "sample/test2.rb",
     "sample/test4.rb"],
   @has_rdoc=false,
   @homepage="http://www.postgresql.jp/interfaces/ruby/",