1 files changed, 35 insertions, 3 deletions
diff --git a/config/config.go b/config/config.go
index b70cebc..4cf5f7c 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,9 +1,20 @@
 package config
 
-import "errors"
+import (
+	"errors"
+	"fmt"
+
+	"gopkg.in/src-d/go-git.v3/clients/common"
+)
+
+const (
+	DefaultRefSpec = "+refs/heads/*:refs/remotes/%s/*"
+)
 
 var (
-	ErrRemoteConfigNotFound = errors.New("remote config not found")
+	ErrRemoteConfigNotFound  = errors.New("remote config not found")
+	ErrRemoteConfigEmptyURL  = errors.New("remote config: empty URL")
+	ErrRemoteConfigEmptyName = errors.New("remote config: empty name")
 )
 
 type ConfigStorage interface {
@@ -16,5 +27,26 @@ type ConfigStorage interface {
 type RemoteConfig struct {
 	Name  string
 	URL   string
-	Fetch RefSpec
+	Fetch []RefSpec
+}
+
+// Validate validate the fields and set the default values
+func (c *RemoteConfig) Validate() error {
+	if c.Name == "" {
+		return ErrRemoteConfigEmptyName
+	}
+
+	if c.URL == "" {
+		return ErrRemoteConfigEmptyURL
+	}
+
+	if _, err := common.NewEndpoint(c.URL); err != nil {
+		return err
+	}
+
+	if len(c.Fetch) == 0 {
+		c.Fetch = []RefSpec{RefSpec(fmt.Sprintf(DefaultRefSpec, c.Name))}
+	}
+
+	return nil
 }