git_etc: update based on bottle etc/var changes.

Library/Homebrew/formula.rb

@@ -165,12 +165,7 @@ class Formula
   def kext_prefix; prefix+'Library/Extensions' end
 
   # configuration needs to be preserved past upgrades
-  def etc
+  def etc; (HOMEBREW_PREFIX+'etc').extend(InstallRenamed) end
-    etc = HOMEBREW_PREFIX+'etc'
-    etc = prefix+etc if HOMEBREW_GIT_ETC
-    etc.extend(InstallRenamed)
-    etc
-  end
 
   # generally we don't want var stuff inside the keg
   def var; HOMEBREW_PREFIX+'var' end

Library/Homebrew/formula_installer.rb

@@ -79,47 +79,65 @@ class FormulaInstaller
     etc = HOMEBREW_PREFIX+'etc'
     etc.cd do
       quiet_system 'git', 'init' unless (etc+'.git').directory?
-      quiet_system 'git', 'checkout', '-B', "#{f.name}-last"
+      quiet_system 'git', 'checkout', '-B', "#{f.name}-preinstall"
+      unless quiet_system 'git', 'diff', '--exit-code', 'HEAD'
         system 'git', 'add', '--all', '.'
         system 'git', 'commit', '-m', "#{f.name}-#{f.version}: preinstall"
       end
+
+      unless quiet_system 'git', 'rev-parse', 'master'
+        quiet_system 'git', 'branch', 'master'
+      end
+    end
   end
 
   def git_etc_postinstall
     return unless quiet_system 'git', '--version'
 
     etc = HOMEBREW_PREFIX+'etc'
-    keg_etc_files = Dir[f.etc+'*']
+    preinstall_branch = "#{f.name}-preinstall"
-    last_branch = "#{f.name}-last"
     default_branch = "#{f.name}-default"
     merged = false
     etc.cd do
-      FileUtils.cp_r keg_etc_files, etc
+      if quiet_system 'git', 'diff', '--exit-code', preinstall_branch
-
+        quiet_system 'git', 'branch', default_branch
-      system 'git', 'add', '--all', '.'
+        quiet_system 'git', 'branch', '-D', preinstall_branch
-      if quiet_system 'git', 'diff', '--exit-code', default_branch
+      elsif not quiet_system 'git', 'rev-parse', default_branch
-        quiet_system 'git', 'reset', '--hard'
+        quiet_system 'git', 'checkout', '-B', default_branch
-      else
+        quiet_system 'git', 'add', '--all', '.'
-        if quiet_system 'git', 'rev-parse', 'master'
+        system 'git', 'commit', '-m', "#{f.name}-#{f.version}: default"
-          quiet_system 'git', 'checkout', '-f', 'master'
+        quiet_system 'git', 'branch', '-D', preinstall_branch
-          FileUtils.cp_r keg_etc_files, etc
+      else
+        previous_default_branch = `git rev-parse #{default_branch}`.strip
+        quiet_system 'git', 'checkout', '-B', default_branch
         quiet_system 'git', 'add', '--all', '.'
-        else
-          quiet_system 'git', 'checkout', '-b' 'master'
-        end
         system 'git', 'commit', '-m', "#{f.name}-#{f.version}: default"
-        quiet_system 'git', 'branch', '-f', default_branch
 
-        merged = true unless quiet_system 'git' 'merge-base', '--is-ancestor',
+        default_unchanged = quiet_system('git', 'diff', '--exit-code', \
-                                          last_branch, 'master'
+                                                previous_default_branch)
+
+        if default_unchanged
+          system 'git', 'reset', '--hard', previous_default_branch
+        end
+
+        quiet_system 'git', 'checkout', 'master'
+        quiet_system 'git', 'reset', '--hard', preinstall_branch
+
+        unless default_unchanged
+          merge_ff = quiet_system 'git', 'merge', '--ff-only', '--no-edit',
+                                         '-X', 'ours', default_branch
+          unless merge_ff
+            merged = true
             system 'git', 'merge', '--no-ff', '--no-edit',
-               '-X', 'theirs', last_branch
+                          '-X', 'ours', default_branch
+          end
+        end
       end
 
       if merged
         ohai "Configuration Files"
         puts "Your configuration files for #{f.name} in etc were merged:"
-        puts "To reverse this merge: git reset --hard #{last_branch}"
+        puts "To reverse this merge: git reset --hard #{preinstall_branch}"
         puts "To restore defaults:   git reset --hard #{default_branch}"
       end
     end
@@ -175,7 +193,7 @@ class FormulaInstaller
 
     @@attempted << f
 
-    #git_etc_preinstall if HOMEBREW_GIT_ETC
+    git_etc_preinstall if ENV['HOMEBREW_GIT_ETC']
 
     @poured_bottle = false
 
@@ -208,7 +226,7 @@ class FormulaInstaller
       opoo "#{f.name} post_install failed. Rerun with `brew postinstall #{f.name}`."
     end
 
-    #git_etc_postinstall if HOMEBREW_GIT_ETC
+    git_etc_postinstall if ENV['HOMEBREW_GIT_ETC']
 
     opoo "Nothing was installed to #{f.prefix}" unless f.installed?
   end

Library/Homebrew/global.rb

@@ -84,8 +84,6 @@ HOMEBREW_USER_AGENT = "Homebrew #{HOMEBREW_VERSION} (Ruby #{RUBY_VERSION}-#{RUBY
 
 HOMEBREW_CURL_ARGS = '-f#LA'
 
-HOMEBREW_GIT_ETC = !ENV['HOMEBREW_GIT_ETC'].nil?
-
 module Homebrew extend self
   include FileUtils
 

Library/Homebrew/install_renamed.rb

@@ -15,7 +15,7 @@ module InstallRenamed
   private
 
   def append_default_if_different src, dst
-    if File.file? dst and !FileUtils.identical?(src, dst) and !HOMEBREW_GIT_ETC
+    if File.file? dst and !FileUtils.identical?(src, dst) and !ENV['HOMEBREW_GIT_ETC']
       dst += ".default"
     end
     dst

Library/Homebrew/keg.rb

@@ -114,7 +114,7 @@ class Keg < Pathname
 
     # yeah indeed, you have to force anything you need in the main tree into
     # these dirs REMEMBER that *NOT* everything needs to be in the main tree
-    link_dir('etc', mode) {:mkpath} unless HOMEBREW_GIT_ETC
+    link_dir('etc', mode) {:mkpath}
     link_dir('bin', mode) {:skip_dir}
     link_dir('sbin', mode) {:skip_dir}
     link_dir('include', mode) {:link}

Library/Homebrew/test/testing_env.rb

@@ -25,7 +25,6 @@ HOMEBREW_USER_AGENT    = 'Homebrew'
 HOMEBREW_WWW           = 'http://example.com'
 HOMEBREW_CURL_ARGS     = '-fsLA'
 HOMEBREW_VERSION       = '0.9-test'
-HOMEBREW_GIT_ETC       = false
 
 RUBY_BIN = Pathname.new(RbConfig::CONFIG['bindir'])
 RUBY_PATH = RUBY_BIN + RbConfig::CONFIG['ruby_install_name'] + RbConfig::CONFIG['EXEEXT']