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diff --git a/jni/ruby/lib/rake/packagetask.rb b/jni/ruby/lib/rake/packagetask.rb
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+# Define a package task library to aid in the definition of
+# redistributable package files.
+
+require 'rake'
+require 'rake/tasklib'
+
+module Rake
+
+  # Create a packaging task that will package the project into
+  # distributable files (e.g zip archive or tar files).
+  #
+  # The PackageTask will create the following targets:
+  #
+  # +:package+ ::
+  #   Create all the requested package files.
+  #
+  # +:clobber_package+ ::
+  #   Delete all the package files.  This target is automatically
+  #   added to the main clobber target.
+  #
+  # +:repackage+ ::
+  #   Rebuild the package files from scratch, even if they are not out
+  #   of date.
+  #
+  # <tt>"<em>package_dir</em>/<em>name</em>-<em>version</em>.tgz"</tt> ::
+  #   Create a gzipped tar package (if <em>need_tar</em> is true).
+  #
+  # <tt>"<em>package_dir</em>/<em>name</em>-<em>version</em>.tar.gz"</tt> ::
+  #   Create a gzipped tar package (if <em>need_tar_gz</em> is true).
+  #
+  # <tt>"<em>package_dir</em>/<em>name</em>-<em>version</em>.tar.bz2"</tt> ::
+  #   Create a bzip2'd tar package (if <em>need_tar_bz2</em> is true).
+  #
+  # <tt>"<em>package_dir</em>/<em>name</em>-<em>version</em>.zip"</tt> ::
+  #   Create a zip package archive (if <em>need_zip</em> is true).
+  #
+  # Example:
+  #
+  #   Rake::PackageTask.new("rake", "1.2.3") do |p|
+  #     p.need_tar = true
+  #     p.package_files.include("lib/**/*.rb")
+  #   end
+  #
+  class PackageTask < TaskLib
+    # Name of the package (from the GEM Spec).
+    attr_accessor :name
+
+    # Version of the package (e.g. '1.3.2').
+    attr_accessor :version
+
+    # Directory used to store the package files (default is 'pkg').
+    attr_accessor :package_dir
+
+    # True if a gzipped tar file (tgz) should be produced (default is
+    # false).
+    attr_accessor :need_tar
+
+    # True if a gzipped tar file (tar.gz) should be produced (default
+    # is false).
+    attr_accessor :need_tar_gz
+
+    # True if a bzip2'd tar file (tar.bz2) should be produced (default
+    # is false).
+    attr_accessor :need_tar_bz2
+
+    # True if a zip file should be produced (default is false)
+    attr_accessor :need_zip
+
+    # List of files to be included in the package.
+    attr_accessor :package_files
+
+    # Tar command for gzipped or bzip2ed archives.  The default is 'tar'.
+    attr_accessor :tar_command
+
+    # Zip command for zipped archives.  The default is 'zip'.
+    attr_accessor :zip_command
+
+    # Create a Package Task with the given name and version.  Use +:noversion+
+    # as the version to build a package without a version or to provide a
+    # fully-versioned package name.
+
+    def initialize(name=nil, version=nil)
+      init(name, version)
+      yield self if block_given?
+      define unless name.nil?
+    end
+
+    # Initialization that bypasses the "yield self" and "define" step.
+    def init(name, version)
+      @name = name
+      @version = version
+      @package_files = Rake::FileList.new
+      @package_dir = 'pkg'
+      @need_tar = false
+      @need_tar_gz = false
+      @need_tar_bz2 = false
+      @need_zip = false
+      @tar_command = 'tar'
+      @zip_command = 'zip'
+    end
+
+    # Create the tasks defined by this task library.
+    def define
+      fail "Version required (or :noversion)" if @version.nil?
+      @version = nil if :noversion == @version
+
+      desc "Build all the packages"
+      task :package
+
+      desc "Force a rebuild of the package files"
+      task :repackage => [:clobber_package, :package]
+
+      desc "Remove package products"
+      task :clobber_package do
+        rm_r package_dir rescue nil
+      end
+
+      task :clobber => [:clobber_package]
+
+      [
+        [need_tar, tgz_file, "z"],
+        [need_tar_gz, tar_gz_file, "z"],
+        [need_tar_bz2, tar_bz2_file, "j"]
+      ].each do |(need, file, flag)|
+        if need
+          task :package => ["#{package_dir}/#{file}"]
+          file "#{package_dir}/#{file}" =>
+            [package_dir_path] + package_files do
+            chdir(package_dir) do
+              sh @tar_command, "#{flag}cvf", file, package_name
+            end
+          end
+        end
+      end
+
+      if need_zip
+        task :package => ["#{package_dir}/#{zip_file}"]
+        file "#{package_dir}/#{zip_file}" =>
+          [package_dir_path] + package_files do
+          chdir(package_dir) do
+            sh @zip_command, "-r", zip_file, package_name
+          end
+        end
+      end
+
+      directory package_dir_path => @package_files do
+        @package_files.each do |fn|
+          f = File.join(package_dir_path, fn)
+          fdir = File.dirname(f)
+          mkdir_p(fdir) unless File.exist?(fdir)
+          if File.directory?(fn)
+            mkdir_p(f)
+          else
+            rm_f f
+            safe_ln(fn, f)
+          end
+        end
+      end
+      self
+    end
+
+    # The name of this package
+
+    def package_name
+      @version ? "#{@name}-#{@version}" : @name
+    end
+
+    # The directory this package will be built in
+
+    def package_dir_path
+      "#{package_dir}/#{package_name}"
+    end
+
+    # The package name with .tgz added
+
+    def tgz_file
+      "#{package_name}.tgz"
+    end
+
+    # The package name with .tar.gz added
+
+    def tar_gz_file
+      "#{package_name}.tar.gz"
+    end
+
+    # The package name with .tar.bz2 added
+
+    def tar_bz2_file
+      "#{package_name}.tar.bz2"
+    end
+
+    # The package name with .zip added
+
+    def zip_file
+      "#{package_name}.zip"
+    end
+  end
+
+end