# Define the different packaging systems.  Each package system is implemented
# in a module, which then gets used to individually extend each package object.
# This allows packages to exist on the same machine using different packaging
# systems.

module Puppet
  newtype(:package) do
    @doc = "Manage packages.  There is a basic dichotomy in package
      support right now:  Some package types (e.g., yum and apt) can
      retrieve their own package files, while others (e.g., rpm and sun) cannot.  For those package formats that cannot retrieve
      their own files, you can use the `source` parameter to point to
      the correct file.

      Puppet will automatically guess the packaging format that you are
      using based on the platform you are on, but you can override it
      using the `provider` parameter; each provider defines what it
      requires in order to function, and you must meet those requirements
      to use a given provider."

    feature :installable, "The provider can install packages.",
      :methods => [:install]
    feature :uninstallable, "The provider can uninstall packages.",
      :methods => [:uninstall]
    feature :upgradeable, "The provider can upgrade to the latest version of a
        package.  This feature is used by specifying `latest` as the
        desired value for the package.",
      :methods => [:update, :latest]
    feature :purgeable, "The provider can purge packages.  This generally means
        that all traces of the package are removed, including
        existing configuration files.  This feature is thus destructive
        and should be used with the utmost care.",
      :methods => [:purge]
    feature :versionable, "The provider is capable of interrogating the
        package database for installed version(s), and can select
        which out of a set of available versions of a package to
        install if asked."
    feature :holdable, "The provider is capable of placing packages on hold
        such that they are not automatically upgraded as a result of
        other package dependencies unless explicit action is taken by
        a user or another package. Held is considered a superset of
        installed.",
      :methods => [:hold]

    ensurable do
      desc "What state the package should be in.
        *latest* only makes sense for those packaging formats that can
        retrieve new packages on their own and will throw an error on
        those that cannot.  For those packaging systems that allow you
        to specify package versions, specify them here.  Similarly,
        *purged* is only useful for packaging systems that support
        the notion of managing configuration files separately from
        'normal' system files."

      attr_accessor :latest

      newvalue(:present, :event => :package_installed) do
        provider.install
      end

      newvalue(:absent, :event => :package_removed) do
        provider.uninstall
      end

      newvalue(:purged, :event => :package_purged, :required_features => :purgeable) do
        provider.purge
      end

      newvalue(:held, :event => :package_held, :required_features => :holdable) do
        provider.hold
      end

      # Alias the 'present' value.
      aliasvalue(:installed, :present)

      newvalue(:latest, :required_features => :upgradeable) do
        # Because yum always exits with a 0 exit code, there's a retrieve
        # in the "install" method.  So, check the current state now,
        # to compare against later.
        current = self.retrieve
        begin
          provider.update
        rescue => detail
          self.fail "Could not update: #{detail}"
        end

        if current == :absent
          :package_installed
        else
          :package_changed
        end
      end

      newvalue(/./, :required_features => :versionable) do
        begin
          provider.install
        rescue => detail
          self.fail "Could not update: #{detail}"
        end

        if self.retrieve == :absent
          :package_installed
        else
          :package_changed
        end
      end

      defaultto :installed

      # Override the parent method, because we've got all kinds of
      # funky definitions of 'in sync'.
      def insync?(is)
        @should ||= []

        @latest ||= nil
        @lateststamp ||= (Time.now.to_i - 1000)
        # Iterate across all of the should values, and see how they
        # turn out.

        @should.each { |should|
          case should
          when :present
            return true unless [:absent, :purged, :held].include?(is)
          when :latest
            # Short-circuit packages that are not present
            return false if is == :absent or is == :purged

            # Don't run 'latest' more than about every 5 minutes
            if @latest and ((Time.now.to_i - @lateststamp) / 60) < 5
              #self.debug "Skipping latest check"
            else
              begin
                @latest = provider.latest
                @lateststamp = Time.now.to_i
              rescue => detail
                error = Puppet::Error.new("Could not get latest version: #{detail}")
                error.set_backtrace(detail.backtrace)
                raise error
              end
            end

            case is
            when @latest
              return true
            when :present
              # This will only happen on retarded packaging systems
              # that can't query versions.
              return true
            else
              self.debug "#{@resource.name} #{is.inspect} is installed, latest is #{@latest.inspect}"
            end
          when :absent
            return true if is == :absent or is == :purged
          when :purged
            return true if is == :purged
          when is
            return true
          end
        }

        false
      end

      # This retrieves the current state. LAK: I think this method is unused.
      def retrieve
        provider.properties[:ensure]
      end

      # Provide a bit more information when logging upgrades.
      def should_to_s(newvalue = @should)
        if @latest
          @latest.to_s
        else
          super(newvalue)
        end
      end
    end

    newparam(:name) do
      desc "The package name.  This is the name that the packaging
      system uses internally, which is sometimes (especially on Solaris)
      a name that is basically useless to humans.  If you want to
      abstract package installation, then you can use aliases to provide
      a common name to packages:

          # In the 'openssl' class
          $ssl = $operatingsystem ? {
            solaris => SMCossl,
            default => openssl
          }

          # It is not an error to set an alias to the same value as the
          # object name.
          package { $ssl:
            ensure => installed,
            alias => openssl
          }

          . etc. .

          $ssh = $operatingsystem ? {
            solaris => SMCossh,
            default => openssh
          }

          # Use the alias to specify a dependency, rather than
          # having another selector to figure it out again.
          package { $ssh:
            ensure => installed,
            alias => openssh,
            require => Package[openssl]
          }

      "
      isnamevar
    end

    newparam(:source) do
      desc "Where to find the actual package.  This must be a local file
        (or on a network file system) or a URL that your specific
        packaging type understands; Puppet will not retrieve files for you."
    end
    newparam(:instance) do
      desc "A read-only parameter set by the package."
    end
    newparam(:status) do
      desc "A read-only parameter set by the package."
    end

    newparam(:type) do
      desc "Deprecated form of `provider`."

      munge do |value|
        warning "'type' is deprecated; use 'provider' instead"
        @resource[:provider] = value

        @resource[:provider]
      end
    end

    newparam(:adminfile) do
      desc "A file containing package defaults for installing packages.
        This is currently only used on Solaris.  The value will be
        validated according to system rules, which in the case of
        Solaris means that it should either be a fully qualified path
        or it should be in `/var/sadm/install/admin`."
    end

    newparam(:responsefile) do
      desc "A file containing any necessary answers to questions asked by
        the package.  This is currently used on Solaris and Debian.  The
        value will be validated according to system rules, but it should
        generally be a fully qualified path."
    end

    newparam(:configfiles) do
      desc "Whether configfiles should be kept or replaced.  Most packages
        types do not support this parameter."

      defaultto :keep

      newvalues(:keep, :replace)
    end

    newparam(:category) do
      desc "A read-only parameter set by the package."
    end
    newparam(:platform) do
      desc "A read-only parameter set by the package."
    end
    newparam(:root) do
      desc "A read-only parameter set by the package."
    end
    newparam(:vendor) do
      desc "A read-only parameter set by the package."
    end
    newparam(:description) do
      desc "A read-only parameter set by the package."
    end

    newparam(:allowcdrom) do
      desc "Tells apt to allow cdrom sources in the sources.list file.
        Normally apt will bail if you try this."

      newvalues(:true, :false)
    end

    newparam(:flavor) do
      desc "Newer versions of OpenBSD support 'flavors', which are
        further specifications for which type of package you want."
    end

    autorequire(:file) do
      autos = []
      [:responsefile, :adminfile].each { |param|
        if val = self[param]
          autos << val
        end
      }

      if source = self[:source]
        if source =~ /^#{File::SEPARATOR}/
          autos << source
        end
      end
      autos
    end

    # This only exists for testing.
    def clear
      if obj = @parameters[:ensure]
        obj.latest = nil
      end
    end

    # The 'query' method returns a hash of info if the package
    # exists and returns nil if it does not.
    def exists?
      @provider.get(:ensure) != :absent
    end
  end
end