Added Y2Packager::MediumType class

src/lib/y2packager/medium_type.rb

@@ -0,0 +1,98 @@
+# ------------------------------------------------------------------------------
+# Copyright (c) 2019 SUSE LLC, All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of version 2 of the GNU General Public License as published by the
+# Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+# ------------------------------------------------------------------------------
+
+require "yast"
+
+require "y2packager/product_location"
+require "y2packager/repomd_downloader"
+
+Yast.import "InstURL"
+
+module Y2Packager
+  # This class scans the installation medium type.
+  class MediumType
+    extend Yast::Logger
+
+    # Type of the installation medium
+    #
+    # @return [Symbol] Symbol describing the medium, one of `:offline`,
+    # `:online` or `:standard`
+    def self.type
+      @type ||= detect_medium_type
+    end
+
+    # Is the medium an online installation medium? (SLE Online)
+    # The online installation medium contains no repository
+    # or a repository without any base product.
+    def self.online?
+      type == :online
+    end
+
+    # Is the medium an offline installation medium?  (SLE Offline)
+    # The offline installation medium contains several installation repositories.
+    # (At least one base product and one module/extension, usually there are
+    # several base products and many modules/extensions.)
+    def self.offline?
+      type == :offline
+    end
+
+    # Is the medium an standard installation medium? (openSUSE Leap)
+    # The standard installation medium contains a single repository
+    # with at least one base product. (Usually there is only one base product.)
+    def self.standard?
+      type == :standard
+    end
+
+    ##############################################################################################
+
+    #
+    # Detect the medium type.
+    #
+    # @return [Symbol] Symbol describing the medium, one of `:offline`,
+    # `:online` or `:standard`
+    def self.detect_medium_type
+      url = Yast::InstURL.installInf2Url("")
+
+      raise "The installation URL is not set" if url.nil? || url.empty?
+
+      # scan the number of the products in the media.1/products file
+      downloader = Y2Packager::RepomdDownloader.new(url)
+      product_repos = downloader.product_repos
+
+      # the online medium should not contain any repository
+      # TODO: how to detect an invalid installation URL or a broken medium??
+      if product_repos.empty?
+        log.info("Detected medium type: online (no repository on the medium)")
+        return :online
+      end
+
+      # the offline medium contains several modules and extensions
+      if product_repos.size > 1
+        log.info("Detected medium type: offline (found #{product_repos.size} product repositories)")
+        return :offline
+      end
+
+      # scan the available base products on the medium
+      base_products = Y2Packager::ProductLocation.scan(url).select { |p| p.details&.base }
+
+      if base_products.empty?
+        log.info("Detected medium type: online (no base product found on the medium)")
+        :online
+      else
+        log.info("Detected medium type: standard (found #{base_products.size} base products)")
+        :standard
+      end
+    end
+
+    private_class_method :detect_medium_type
+  end
+end

test/medium_type_test.rb

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+require_relative "test_helper"
+require "y2packager/medium_type"
+
+describe Y2Packager::MediumType do
+  Yast.import "Pkg"
+
+  let(:repo_url) { "http://example.com/repo" }
+
+  before do
+    allow(Yast::InstURL).to receive (:installInf2Url).and_return(repo_url)
+  end
+
+  describe "#type" do
+    it "raises an exception when the installation URL is nil" do
+
+    end
+
+    it "raises an exception when the installation URL is empty" do
+
+    end
+  end
+end