[entropy.spm] PortagePlugin: add resolve_spm_package_uid()

lib/entropy/spm/plugins/interfaces/portage_plugin/__init__.py

@@ -1817,6 +1817,12 @@ class PortagePlugin(SpmPlugin):
 
         return counter
 
+    def resolve_spm_package_uid(self, package):
+        """
+        Reimplemented from SpmPlugin class.
+        """
+        return self.get_installed_package_metadata(package, "COUNTER")
+
     def search_paths_owners(self, paths, exact_match = True):
         """
         Reimplemented from SpmPlugin class.

lib/entropy/spm/plugins/skel.py

@@ -596,6 +596,18 @@ class SpmPlugin(Singleton):
         """
         raise NotImplementedError()
 
+    def resolve_spm_package_uid(self, package):
+        """
+        Given a Source Package Manager atom, return its UID.
+
+        @param package: Source Package Manager atom
+        @type package: string
+        @return: Source Package Manager UID for package
+        @rtype: int
+        @raise KeyError: in case the package cannot be resolved into UID.
+        """
+        raise NotImplementedError()
+
     def convert_from_entropy_package_name(self, entropy_package_name):
         """
         This function should be able to convert an Entropy package name (atom)