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>

6 files changed, 6 insertions, 10 deletions

diff --git a/Library/Contributions/brew_bash_completion.sh b/Library/Contributions/brew_bash_completion.sh
index 6261f7749..0e573f309 100644
--- a/Library/Contributions/brew_bash_completion.sh
+++ b/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"
 
diff --git a/Library/Contributions/cmds/brew-server b/Library/Contributions/cmds/brew-server
index bcc15c257..fe81ea64c 100755
--- a/Library/Contributions/cmds/brew-server
+++ b/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.
diff --git a/Library/Contributions/install_homebrew.rb b/Library/Contributions/install_homebrew.rb
index 32099946f..3cf4f2f1c 100644
--- a/Library/Contributions/install_homebrew.rb
+++ b/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.
 
diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index f72633ffa..9ba49ba3f 100755
--- a/Library/Homebrew/build.rb
+++ b/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
diff --git a/Library/Homebrew/cmd/--config.rb b/Library/Homebrew/cmd/--config.rb
index abe247cad..5fb455d23 100644
--- a/Library/Homebrew/cmd/--config.rb
+++ b/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}
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 2e57be44a..338bd4771 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/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',
              '--',