virt-install: Add --install OSNAME

Replace the unreleased --os-variant OSNAME,install=location with just

  --install OSNAME

Unwind the --unattended dependency on upfront --os-variant while
we are at it, since they are all intertwined. Now we can just do:

  virt-install --install OSNAME
and
  virt-install --install OSNAME --unattended

1 files changed, 1 insertions, 5 deletions

diff --git a/virtinst/guest.py b/virtinst/guest.py
index 5ad2b61d..7c8ed001 100644
--- a/virtinst/guest.py
+++ b/virtinst/guest.py
@@ -458,11 +458,7 @@ class Guest(XMLBuilder):
         self._metadata.libosinfo.os_id = obj.full_id
 
     def set_os_name(self, name):
-        obj = OSDB.lookup_os(name)
-        if obj is None:
-            raise ValueError(_("Unknown OS name '%s'. "
-                    "See `osinfo-query os` for valid values.") % name)
-
+        obj = OSDB.lookup_os(name, raise_error=True)
         logging.debug("Setting Guest osinfo name %s", obj)
         self._set_os_obj(obj)