Replace /usr/bin/ruby with full Framework path

Rationale: some users insist on replacing the /usr/bin/ruby symlink
to point to another ruby on their system, which may break homebrew.
Use the full Framework path instead, which is less likely to be tampered with.

This also reorganizes the brew --config checks to reflect the different path.

Fixes Homebrew/homebrew#12009.

Closes Homebrew/homebrew#12333.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>

Library/Contributions/brew_bash_completion.sh

@@ -95,7 +95,7 @@ __brew_complete_tapped ()
 __brew_complete_taps ()
 {
     if [[ -z "$__brew_cached_taps" ]]; then
-        __brew_cached_taps="$(/usr/bin/ruby -e '
+        __brew_cached_taps="$(/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -e '
             require "open-uri"
             require "yaml"
 

Library/Contributions/cmds/brew-server

@@ -1,4 +1,4 @@
-#!/usr/bin/ruby
+#!/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
 
 ## brew server: Run a local webserver for browsing available and installed brews.
 # Note: this external command is ruby, but set up as a shell script, so that it gets exec'd.

Library/Contributions/install_homebrew.rb

@@ -1,4 +1,4 @@
-#!/usr/bin/ruby
+#!/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
 # This script installs to /usr/local only. To install elsewhere you can just
 # untar https://github.com/mxcl/homebrew/tarball/master anywhere you like.
 

Library/Homebrew/build.rb

@@ -1,4 +1,4 @@
-#!/usr/bin/ruby
+#!/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
 
 # This script is called by formula_installer as a separate instance.
 # Rationale: Formula can use __END__, Formula can change ENV

Library/Homebrew/cmd/--config.rb

@@ -91,10 +91,7 @@ module Homebrew extend self
     puts hardware
     puts "MacOS: #{MACOS_FULL_VERSION}-#{kernel}"
     puts "Xcode: #{xcode_version}"
-    puts "/usr/bin/ruby: #{RUBY_VERSION}-#{RUBY_PATCHLEVEL}" if RUBY_VERSION.to_f != 1.8
-
-    ruby = Pathname.new("/usr/bin/ruby")
-    puts "/usr/bin/ruby => #{ruby.realpath}" unless ruby.realpath.to_s =~ %r{^/System}
+    puts "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby:\n  #{RUBY_VERSION}-#{RUBY_PATCHLEVEL}" if RUBY_VERSION.to_f != 1.8
 
     ponk = macports_or_fink_installed?
     puts "MacPorts/Fink: #{ponk}" if ponk
@@ -119,7 +116,6 @@ module Homebrew extend self
     MacPorts or Fink? #{macports_or_fink_installed?}
     X11: #{describe_x11}
     System Ruby: #{RUBY_VERSION}-#{RUBY_PATCHLEVEL}
-    /usr/bin/ruby => #{real_path("/usr/bin/ruby")}
     Which Perl:   #{describe_perl}
     Which Python: #{describe_python}
     Which Ruby:   #{describe_ruby}

Library/Homebrew/formula_installer.rb

@@ -195,7 +195,7 @@ class FormulaInstaller
       begin
         read.close
         exec '/usr/bin/nice',
-             '/usr/bin/ruby',
+             '/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby',
              '-I', Pathname.new(__FILE__).dirname,
              '-rbuild',
              '--',

bin/brew

@@ -1,4 +1,4 @@
-#!/usr/bin/ruby
+#!/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
 # -*- coding: utf-8 -*-
 
 HOMEBREW_BREW_FILE = ENV['HOMEBREW_BREW_FILE'] = File.expand_path(__FILE__)