Portability fixes to run Homebrew on Linux systems

Closes Homebrew/homebrew#16344.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Library/Homebrew/formula_installer.rb

@@ -284,7 +284,7 @@ class FormulaInstaller
     fork do
       begin
         read.close
-        exec '/usr/bin/nice',
+        exec 'nice',
              RUBY_PATH,
              '-W0',
              '-I', Pathname.new(__FILE__).dirname,

Library/Homebrew/hardware.rb

@@ -1,47 +1,15 @@
 class Hardware
-  # These methods use info spewed out by sysctl.
-  # Look in <mach/machine.h> for decoding info.
-
-  def self.cpu_type
-    @@cpu_type ||= `/usr/sbin/sysctl -n hw.cputype`.to_i
-
-    case @@cpu_type
-    when 7
-      :intel
-    when 18
-      :ppc
-    else
-      :dunno
-    end
+  case RUBY_PLATFORM.downcase
+  when /darwin/
+    require 'os/mac/hardware'
+    extend MacOSHardware
+  when /linux/
+    require 'os/linux/hardware'
+    extend LinuxHardware
+  else
+    raise "The system `#{`uname`.chomp}' is not supported."
   end
 
-  def self.intel_family
-    @@intel_family ||= `/usr/sbin/sysctl -n hw.cpufamily`.to_i
-
-    case @@intel_family
-    when 0x73d67300 # Yonah: Core Solo/Duo
-      :core
-    when 0x426f69ef # Merom: Core 2 Duo
-      :core2
-    when 0x78ea4fbc # Penryn
-      :penryn
-    when 0x6b5a4cd2 # Nehalem
-      :nehalem
-    when 0x573B5EEC # Arrandale
-      :arrandale
-    when 0x5490B78C # Sandy Bridge
-      :sandybridge
-    when 0x1F65E835 # Ivy Bridge
-      :ivybridge
-    else
-      :dunno
-    end
-  end
-
-  def self.processor_count
-    @@processor_count ||= `/usr/sbin/sysctl -n hw.ncpu`.to_i
-  end
-  
   def self.cores_as_words
     case Hardware.processor_count
     when 1 then 'single'
@@ -56,21 +24,7 @@ class Hardware
     not self.is_64_bit?
   end
 
-  def self.is_64_bit?
-    return @@is_64_bit if defined? @@is_64_bit
-    @@is_64_bit = self.sysctl_bool("hw.cpu64bit_capable")
-  end
-  
   def self.bits
     Hardware.is_64_bit? ? 64 : 32
   end
-
-protected
-  def self.sysctl_bool(property)
-    result = nil
-    IO.popen("/usr/sbin/sysctl -n #{property} 2>/dev/null") do |f|
-      result = f.gets.to_i # should be 0 or 1
-    end
-    $?.success? && result == 1 # sysctl call succeded and printed 1
-  end
 end

Library/Homebrew/mach.rb

@@ -40,6 +40,8 @@ module MachO
         end
       when 0xcefaedfe, 0xcffaedfe, 0xfeedface, 0xfeedfacf # Single arch
         offsets << 0
+      when 0x7f454c46 # ELF
+        mach_data << { :arch => :x86_64, :type => :executable }
       else
         raise "Not a Mach-O binary."
       end

Library/Homebrew/macos.rb

@@ -1,4 +1,4 @@
-require 'macos/version'
+require 'os/mac/version'
 
 module MacOS extend self
 
@@ -238,5 +238,5 @@ module MacOS extend self
   end
 end
 
-require 'macos/xcode'
-require 'macos/xquartz'
+require 'os/mac/xcode'
+require 'os/mac/xquartz'

Library/Homebrew/os/linux/hardware.rb

@@ -0,0 +1,25 @@
+module LinuxHardware
+  def cpu_type
+    @@cpu_type ||= case `uname -m`
+      when /x86_64/
+        :intel
+      when /i386/
+        :intel
+      else
+        :dunno
+      end
+  end
+
+  def intel_family
+    :dunno
+  end
+
+  def processor_count
+    `grep -c ^processor /proc/cpuinfo`.to_i
+  end
+
+  def is_64_bit?
+    return @@is_64_bit if defined? @@is_64_bit
+    @@is_64_bit = /64/ === `uname -m`
+  end
+end

Library/Homebrew/os/mac/hardware.rb

@@ -0,0 +1,57 @@
+module MacOSHardware
+  # These methods use info spewed out by sysctl.
+  # Look in <mach/machine.h> for decoding info.
+  def cpu_type
+    @@cpu_type ||= `/usr/sbin/sysctl -n hw.cputype`.to_i
+
+    case @@cpu_type
+    when 7
+      :intel
+    when 18
+      :ppc
+    else
+      :dunno
+    end
+  end
+
+  def intel_family
+    @@intel_family ||= `/usr/sbin/sysctl -n hw.cpufamily`.to_i
+
+    case @@intel_family
+    when 0x73d67300 # Yonah: Core Solo/Duo
+      :core
+    when 0x426f69ef # Merom: Core 2 Duo
+      :core2
+    when 0x78ea4fbc # Penryn
+      :penryn
+    when 0x6b5a4cd2 # Nehalem
+      :nehalem
+    when 0x573B5EEC # Arrandale
+      :arrandale
+    when 0x5490B78C # Sandy Bridge
+      :sandybridge
+    when 0x1F65E835 # Ivy Bridge
+      :ivybridge
+    else
+      :dunno
+    end
+  end
+
+  def processor_count
+    @@processor_count ||= `/usr/sbin/sysctl -n hw.ncpu`.to_i
+  end
+
+  def is_64_bit?
+    return @@is_64_bit if defined? @@is_64_bit
+    @@is_64_bit = sysctl_bool("hw.cpu64bit_capable")
+  end
+
+protected
+  def sysctl_bool(property)
+    result = nil
+    IO.popen("/usr/sbin/sysctl -n #{property} 2>/dev/null") do |f|
+      result = f.gets.to_i # should be 0 or 1
+    end
+    $?.success? && result == 1 # sysctl call succeded and printed 1
+  end
+end

Library/Homebrew/test/test_version_subclasses.rb

@@ -1,6 +1,6 @@
 require 'testing_env'
 require 'version'
-require 'macos/version'
+require 'os/mac/version'
 
 class MacOSVersionTests < Test::Unit::TestCase
   def setup