Add a method to Installer classes to validate argument input

There was no way to validate argument input from plugins and
cause the installer to bail out. If a plugin needs to validate
some input it can use the validate_args() method and raise
ConfigurationError() if an issue is found.

https://fedorahosted.org/ipsilon/ticket/78

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/ipsilon/info/common.py b/ipsilon/info/common.py
index 725f0fa..dd48ae9 100644
--- a/ipsilon/info/common.py
+++ b/ipsilon/info/common.py
@@ -94,6 +94,9 @@ class InfoProviderInstaller(object):
     def install_args(self, group):
         raise NotImplementedError
 
+    def validate_args(self, args):
+        return
+
     def unconfigure(self, opts):
         return