3 files changed, 56 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
 }
diff --git a/config/refspec.go b/config/refspec.go
index e74bf78..dae13be 100644
--- a/config/refspec.go
+++ b/config/refspec.go
@@ -112,3 +112,14 @@ func (s RefSpec) Dst(n core.ReferenceName) core.ReferenceName {
 func (s RefSpec) String() string {
 	return string(s)
 }
+
+// MatchAny returns true if any of the RefSpec match with the given ReferenceName
+func MatchAny(l []RefSpec, n core.ReferenceName) bool {
+	for _, r := range l {
+		if r.Match(n) {
+			return true
+		}
+	}
+
+	return false
+}
diff --git a/config/refspec_test.go b/config/refspec_test.go
index b0bb8f5..632f5a4 100644
--- a/config/refspec_test.go
+++ b/config/refspec_test.go
@@ -67,3 +67,13 @@ func (s *RefSpecSuite) TestRefSpecDstBlob(c *C) {
 		"refs/remotes/origin/foo",
 	)
 }
+func (s *RefSpecSuite) TestMatchAny(c *C) {
+	specs := []RefSpec{
+		"refs/heads/bar:refs/remotes/origin/foo",
+		"refs/heads/foo:refs/remotes/origin/bar",
+	}
+
+	c.Assert(MatchAny(specs, core.ReferenceName("refs/heads/foo")), Equals, true)
+	c.Assert(MatchAny(specs, core.ReferenceName("refs/heads/bar")), Equals, true)
+	c.Assert(MatchAny(specs, core.ReferenceName("refs/heads/master")), Equals, false)
+}