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@@ -4,6 +4,10 @@
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 module Piston
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   module Svn
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     class Revision < Piston::Revision
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+      class InvalidRevision < RuntimeError; end
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+      class RepositoryMoved < InvalidRevision; end
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+      class UuidChanged < InvalidRevision; end
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+
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       def client
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         @client ||= Piston::Svn::Client.instance
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       end
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@@ -52,6 +56,18 @@
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         Pathname.new(abspath).dirname.mkpath
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         FileUtils.cp(@wcpath + relpath, abspath)
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+      end
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+
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+      def validate!
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+        data = svn(:info, "--revision", revision, repository.url)
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+        info = YAML.load(data)
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+        actual_uuid = info["Repository UUID"]
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+        raise RepositoryMoved, "Repository at #{repository.url} does not exist anymore:\n#{data}" if actual_uuid.blank?
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+        raise UuidChanged, "Expected repository at #{repository.url} to have UUID #{recalled_uuid} but found #{actual_uuid}" if recalled_uuid != actual_uuid
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+      end
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+
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+      def recalled_uuid
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+        recalled_values[Piston::Svn::UUID]
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       end
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     end
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   end

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@@ -1 +1,50 @@
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+require File.dirname(__FILE__) + "/../../../test_helper"
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+
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+class TestSvnRevisionValidation < Test::Unit::TestCase
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+  def setup
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+    @repository = mock("repository")
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+    @repository.stubs(:url).returns("svn://svn.my-repos.com/projects/libcalc/trunk")
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+  end
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+  
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+  def test_revision_is_invalid_unless_same_uuid
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+    rev = new_revision("HEAD", Piston::Svn::UUID => "1234")
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+    rev.expects(:svn).with(:info, "--revision", "HEAD", @repository.url).returns(INFO)
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+    assert_raise Piston::Svn::Revision::UuidChanged do
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+      rev.validate!
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+    end
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+  end
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+
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+  def test_revision_is_invalid_if_repository_location_does_not_exist_anymore
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+    rev = new_revision("HEAD", Piston::Svn::UUID => "038cbeb6-2227-0410-91ec-8f9533625906")
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+    rev.expects(:svn).with(:info, "--revision", "HEAD", @repository.url).returns("#{@repository.url}:  (Not a valid URL)")
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+    assert_raise Piston::Svn::Revision::RepositoryMoved do
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+      rev.validate!
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+    end
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+  end
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+
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+  def test_revision_is_valid_if_repository_is_present_and_same_uuid
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+    rev = new_revision("HEAD", Piston::Svn::UUID => "038cbeb6-2227-0410-91ec-8f9533625906")
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+    rev.expects(:svn).with(:info, "--revision", "HEAD", @repository.url).returns(INFO)
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+    assert_nothing_raised do
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+      rev.validate!
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+    end
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+  end
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+
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+  protected
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+  def new_revision(rev, recalled_values={})
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+    Piston::Svn::Revision.new(@repository, rev, recalled_values)
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+  end
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+  
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+  INFO = <<EOF
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+Path: project
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+URL: svn://svn.my-repos.com/projects/libcalc/trunk
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+Repository Root: svn://svn.my-repos.com/projects
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+Repository UUID: 038cbeb6-2227-0410-91ec-8f9533625906
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+Revision: 1234
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+Node Kind: directory
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+Last Changed Author: francois
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+Last Changed Rev: 1232
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+Last Changed Date: 2008-04-06 21:57:10 -0400 (Sun, 06 Apr 2008)
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+EOF
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+end