install_homebrew.rb

@@ -0,0 +1,80 @@
+#!/usr/bin/ruby
+#
+# I deliberately didn't DRY /usr/local references into a variable as this
+# script will not "just work" if you change the destination directory. However
+# please feel free to fork it and make that possible.
+#
+# If you do fork ensure you add a comment here that explains what the changes
+# are intended to do and how well you tested them.
+#
+
+module Tty extend self
+  def blue; bold 34; end
+  def white; bold 39; end
+  def red; underline 31; end
+  def reset; escape 0; end
+  def underline; underline 39; end
+  def bold n; escape "1;#{n}" end
+  def underline n; escape "4;#{n}" end
+  def escape n; "\033[#{n}m" if $stdout.tty? end
+end
+
+def ohai s
+  puts "#{Tty.blue}==>#{Tty.white} #{s}#{Tty.reset}"
+end
+
+def sudo *params
+  params.unshift "sudo"
+  ohai params.map{ |p| p.gsub ' ', '\\ ' } * ' '
+  system *params
+end
+
+def opoo warning
+  puts "#{Tty.red}Warning#{Tty.reset}: #{warning}"
+end
+
+####################################################################### script
+require 'fileutils'
+include  FileUtils
+
+#abort "/usr/local/.git already exists!" if File.directory? '/usr/local/.git'
+
+ohai "This script will install:"
+puts "/usr/local/bin/brew"
+puts "/usr/local/Library/Formula/..."
+puts "/usr/local/Library/Homebrew/..."
+
+chmods = %w(bin etc include lib sbin share var . share/locale share/man share/info share/doc share/aclocal).
+            map{ |d| "/usr/local/#{d}" }.
+            select{ |d| File.directory? d and not File.writable? d }
+
+unless chmods.empty?
+  ohai "The following directories will be made group writable:"
+  puts *chmods
+end
+
+puts
+puts "Press enter to continue"
+abort if gets != "\n"
+
+if File.directory? '/usr/local'
+  sudo "/bin/chmod", "g+w", *chmods unless chmods.empty?
+else
+  sudo "/bin/mkdir", '/usr/local'
+  sudo "/bin/chmod", "g+w", '/usr/local'
+end
+
+cd '/usr/local' do
+  tarball = "http://github.com/mxcl/homebrew/tarball/master"
+  ohai "Extracting: #{tarball}"
+  # -m to stop tar erroring out if it can't modify the mtime for root owned directories
+  system "/usr/bin/curl -#L #{tarball} | /usr/bin/tar xz -m --strip 1"
+end
+
+ohai "Installation successful"
+
+if ENV['PATH'].split(':').include? '/usr/local/bin'
+  puts "Now try: brew help"
+else
+  opoo "/usr/local/bin is not in your PATH"
+end