len usage is wrong. We have to see that if there is really an extra package to be installed.

pisi/operations.py

@@ -321,7 +321,7 @@ def install_pkg_names(A, reinstall = False):
         G_f, order = plan_install_pkg_names(A)
     else:
         G_f = None
-        order = A
+        order = list(A)
 
     if len(order) > 1:
         ctx.ui.info(_("Following packages will be installed in the respective "
@@ -334,7 +334,7 @@ def install_pkg_names(A, reinstall = False):
     if ctx.get_option('dry_run'):
         return
 
-    if len(order) > len(A_0):
+    if set(order) - A_0:
         if not ctx.ui.confirm(_('There are extra packages due to dependencies. Do you want to continue?')):
             return False