Add downgrade checking.

pym/cl_assemble.py

@@ -227,7 +227,11 @@ class cl_assemble(color_print):
              {'command':'eselect news read new',
               'step':'readnews',
               'message':_("Reading news"),
-              'progname':'eselect'}]
+              'progname':'eselect'},
+             {'command':"checkDowngrades()",
+              'message':_("Checking downgrades"),
+              'step':'showdowngrade',
+              'progname':'eix'}]
 
     reVerSplit = re.compile(r"^(.*?)-(([^-]+?)(?:-(r\d+))?)(?:.(tbz2))?$",re.S)
 
@@ -1388,6 +1392,13 @@ class cl_assemble(color_print):
                 _("An error occurred when executing the command")+
                   ":\n    %s"%self._getCommand(cmd.command))
 
+    def checkDowngrades(self):
+        """Run check downgrades"""
+        cmd = self.runChroot("FORMAT='{downgrade}%{FORMAT_ALL}{}' eix -I",
+                             raiseError=False,
+                             showProcess=True)
+        return True
+
     def modulesRebuild(self):
         """Run revdep-rebuild and check result"""
         if not self.assemblePath: