main: handle unknown version case

If Ignition was unable to parse the config as an Ignition Config, Cloud
Config, or script, it will return ErrUnknownVersion. This was ignored
before which resulted in the validator claiming that the config was
valid. This catches that case and returns an error.

Author: crawford

validate.go

@@ -26,6 +26,7 @@ import (
 
 	"github.com/coreos/coreos-cloudinit/config/validate"
 	ignConfig "github.com/coreos/ignition/config"
+	"github.com/coreos/ignition/config/validate/report"
 	"github.com/crawford/nap"
 	"github.com/gorilla/mux"
 )
@@ -102,6 +103,13 @@ func putValidate(r *http.Request) (interface{}, nap.Status) {
 			return nil, nap.InternalError{err.Error()}
 		}
 		return rpt.Entries(), nap.OK{}
+	case ignConfig.ErrUnknownVersion:
+		return report.Report{
+			Entries: []report.Entry{{
+				Kind:    report.EntryError,
+				Message: "Failed to parse config. Is this a valid Ignition Config, Cloud-Config, or script?",
+			}},
+		}, nap.OK{}
 	default:
 		rpt.Sort()
 		return rpt.Entries, nap.OK{}