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@@ -245,6 +245,35 @@ module Grit
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       end
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     end
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+    # The list of alternates for this repo
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+    #
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+    # Returns Array[String] (pathnames of alternates)
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+    def alternates
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+      alternates_path = File.join(self.path, *%w{objects info alternates})
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+      
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+      if File.exist?(alternates_path)
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+        File.read(alternates_path).strip.split("\n")
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+      else
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+        []
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+      end
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+    end
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+    
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+    # Sets the alternates
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+    #   +alts+ is the Array of String paths representing the alternates
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+    #
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+    # Returns nothing
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+    def alternates=(alts)
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+      alts.each do |alt|
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+        unless File.exist?(alt)
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+          raise "Could not set alternates. Alternate path #{alt} must exist"
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+        end
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+      end
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+      
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+      File.open(File.join(self.path, *%w{objects info alternates}), 'w') do |f|
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+        f.write alts.join("\n")
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+      end
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+    end
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+    
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     # Pretty object inspection
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     def inspect
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       %Q{#<Grit::Repo "#{@path}">}

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@@ -196,6 +196,51 @@ class TestRepo < Test::Unit::TestCase
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     @r.disable_daemon_serve
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   end
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+  # alternates
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+  
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+  def test_alternates_with_two_alternates
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+    File.expects(:exist?).with('/Users/tom/dev/mojombo/grit/.git/objects/info/alternates').returns(true)
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+    File.expects(:read).returns("/path/to/repo1/.git/objects\n/path/to/repo2.git/objects\n")
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+    
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+    assert_equal ["/path/to/repo1/.git/objects", "/path/to/repo2.git/objects"], @r.alternates
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+  end
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+  
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+  def test_alternates_no_file
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+    File.expects(:exist?).returns(false)
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+    
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+    assert_equal [], @r.alternates
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+  end
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+  
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+  # alternates=
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+  
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+  def test_alternates_setter_ok
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+    alts = %w{/path/to/repo.git/objects /path/to/repo2.git/objects}
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+    
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+    alts.each do |alt|
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+      File.expects(:exist?).with(alt).returns(true)
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+    end
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+    
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+    File.any_instance.expects(:write).with(alts.join("\n"))
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+    
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+    assert_nothing_raised do
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+      @r.alternates = alts
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+    end
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+  end
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+  
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+  def test_alternates_setter_bad
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+    alts = %w{/path/to/repo.git/objects}
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+    
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+    alts.each do |alt|
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+      File.expects(:exist?).with(alt).returns(false)
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+    end
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+    
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+    File.any_instance.expects(:write).never
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+    
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+    assert_raise RuntimeError do
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+      @r.alternates = alts
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+    end
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+  end
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+  
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   # inspect
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   def test_inspect