1 files changed, 51 insertions, 1 deletions
diff --git a/options.go b/options.go
index 2aebbc7..0c1fefb 100644
--- a/options.go
+++ b/options.go
@@ -1,6 +1,8 @@
 package git
 
 import (
+	"errors"
+
 	"gopkg.in/src-d/go-git.v3/clients/common"
 	"gopkg.in/src-d/go-git.v4/core"
 )
@@ -10,6 +12,11 @@ const (
 	DefaultRemoteName = "origin"
 )
 
+var (
+	ErrMissingURL        = errors.New("URL field is required")
+	ErrMissingReferences = errors.New("references cannot be empty")
+)
+
 // RepositoryCloneOptions describe how a clone should be perform
 type RepositoryCloneOptions struct {
 	// The (possibly remote) repository URL to clone from
@@ -26,7 +33,12 @@ type RepositoryCloneOptions struct {
 	Depth int
 }
 
-func (o *RepositoryCloneOptions) Default() {
+// Validate validate the fields and set the default values
+func (o *RepositoryCloneOptions) Validate() error {
+	if o.URL == "" {
+		return ErrMissingURL
+	}
+
 	if o.RemoteName == "" {
 		o.RemoteName = DefaultRemoteName
 	}
@@ -34,12 +46,50 @@ func (o *RepositoryCloneOptions) Default() {
 	if o.ReferenceName == "" {
 		o.ReferenceName = core.HEAD
 	}
+
+	return nil
+}
+
+// RepositoryPullOptions describe how a pull should be perform
+type RepositoryPullOptions struct {
+	// Name of the remote to be pulled
+	RemoteName string
+	// Remote branch to clone
+	ReferenceName core.ReferenceName
+	// Fetch only ReferenceName if true
+	SingleBranch bool
+	// Limit fetching to the specified number of commits
+	Depth int
+}
+
+// Validate validate the fields and set the default values
+func (o *RepositoryPullOptions) Validate() error {
+	if o.RemoteName == "" {
+		o.RemoteName = DefaultRemoteName
+	}
+
+	if o.ReferenceName == "" {
+		o.ReferenceName = core.HEAD
+	}
+
+	return nil
 }
 
 // RemoteFetchOptions describe how a fetch should be perform
 type RemoteFetchOptions struct {
 	// Remote branchs to fetch
 	References []*core.Reference
+	// Local references present on the local storage
+	LocalReferences []*core.Reference
 	// Limit fetching to the specified number of commits
 	Depth int
 }
+
+// Validate validate the fields and set the default values
+func (o *RemoteFetchOptions) Validate() error {
+	if len(o.References) == 0 {
+		return ErrMissingReferences
+	}
+
+	return nil
+}