Correctly handle validation errors vs. errors from the panel during installation

installer/errors.go

@@ -0,0 +1,19 @@
+package installer
+
+type validationError struct {
+	msg string
+}
+
+func (e *validationError) Error() string {
+	return e.msg
+}
+
+func IsValidationError(err error) bool {
+	_, ok := err.(*validationError)
+
+	return ok
+}
+
+func NewValidationError(msg string) error {
+	return &validationError{msg: msg}
+}

installer/installer.go

@@ -22,11 +22,11 @@ type Installer struct {
 // calling Execute().
 func New(data []byte) (*Installer, error) {
 	if !govalidator.IsUUIDv4(getString(data, "uuid")) {
-		return nil, errors.New("uuid provided was not in a valid format")
+		return nil, NewValidationError("uuid provided was not in a valid format")
 	}
 
 	if !govalidator.IsUUIDv4(getString(data, "service", "egg")) {
-		return nil, errors.New("service egg provided was not in a valid format")
+		return nil, NewValidationError("service egg provided was not in a valid format")
 	}
 
 	s := &server.Server{
@@ -82,11 +82,6 @@ func New(data []byte) (*Installer, error) {
 		return nil, errors.New(rerr.String())
 	}
 
-	/*b, err := s.WriteConfigurationToDisk()
-	if err != nil {
-		return nil, err
-	}*/
-
 	// Destroy the temporary server instance.
 	s = nil