PoC to retain openSUSE behaviour when searching for base products

src/lib/y2packager/product_reader.rb

@@ -41,13 +41,12 @@ def self.available_base_products
                                 installation_package: installation_mapping[prod["name"]])
       end
 
-      # only installable products
-      result.select!(&:installation_package)
+      products = find_installable(result)
 
       # sort the products
-      result.sort!(&::Y2Packager::PRODUCT_SORTER)
+      products.sort!(&::Y2Packager::PRODUCT_SORTER)
 
-      log.info "available base products #{result}"
+      log.info "available base products #{products}"
 
       result
     end
@@ -73,8 +72,6 @@ def self.available_products
       products
     end
 
-    private_class_method :available_products
-
     def self.installation_package_mapping
       installation_packages = Yast::Pkg.PkgQueryProvides("system-installation()")
       log.info "Installation packages: #{installation_packages.inspect}"
@@ -98,5 +95,22 @@ def self.installation_package_mapping
 
       mapping
     end
+
+    def self.find_installable(products)
+      installable_products = products.select(&:installation_package)
+      return installable_products unless installable_products.empty?
+
+      log.info "No products with system-installation()."
+
+      if installable_products.size == 1
+        log.info "Assuming #{installable_product.first.label} is the base one."
+        return result
+      end
+
+      log.info "Cannot find the installable product in these candidates: #{products.inspect}"
+      []
+    end
+
+    private_class_method :available_products, :find_installable
   end
 end