Yast::Arch calculates the registration arch

* This piece of functionality is moved from ControlProductSpec.

library/general/src/modules/Arch.rb

@@ -512,6 +512,22 @@ def is_wsl
       SCR.Read(path(".target.string"), "/proc/sys/kernel/osrelease").to_s.downcase.include?("-microsoft")
     end
 
+    # map the Arch.architecture to the arch expected by SCC
+    REG_ARCH = {
+      "s390_32" => "s390",
+      "s390_64" => "s390x",
+      # ppc64le is the only supported PPC arch, we do not have to distinguish the BE/LE variants
+      "ppc64"   => "ppc64le"
+    }.freeze
+    private_constant :REG_ARCH
+
+    # Returns the architecture expected by SCC
+    #
+    # @return [String] Architecture
+    def registration_arch
+      REG_ARCH[architecture] || architecture
+    end
+
     publish function: :architecture, type: "string ()"
     publish function: :i386, type: "boolean ()"
     publish function: :sparc32, type: "boolean ()"

library/general/test/arch_test.rb

@@ -252,4 +252,43 @@
       end
     end
   end
+
+  describe ".registration_arch" do
+    before do
+      allow(subject).to receive(:architecture).and_return(arch)
+    end
+
+    context "on 32 bits s390" do
+      let(:arch) { "s390_32" }
+
+      it "returns s390" do
+        expect(subject.registration_arch).to eq("s390")
+      end
+    end
+
+    context "on 64 bits s390" do
+      let(:arch) { "s390_64" }
+
+      it "returns s390x" do
+        expect(subject.registration_arch).to eq("s390x")
+      end
+    end
+
+    context "on ppc64 architectures" do
+      let(:arch) { "ppc64" }
+
+      it "returns 'ppc64le'" do
+        expect(subject.registration_arch).to eq("ppc64le")
+      end
+    end
+
+    context "on others architectures" do
+      let(:arch) { "x86_64" }
+
+      it "returns the underlying architecture" do
+        expect(subject.registration_arch).to eq("x86_64")
+      end
+    end
+
+  end
 end