support unshallow with fetch

fetch.go

@@ -11,13 +11,14 @@ import (
 type FetchOption func(*fetchOptions)
 
 type fetchOptions struct {
-	All      bool
-	Config   []string
-	Depth    int
-	Force    bool
-	NoTags   bool
-	RefSpecs []string
-	Tags     bool
+	All       bool
+	Config    []string
+	Depth     int
+	Force     bool
+	NoTags    bool
+	RefSpecs  []string
+	Tags      bool
+	Unshallow bool
 }
 
 func (o fetchOptions) String() string {
@@ -44,6 +45,10 @@ func (o fetchOptions) String() string {
 		buf.WriteString(" --no-tags")
 	}
 
+	if o.Unshallow {
+		buf.WriteString(" --unshallow")
+	}
+
 	if len(o.RefSpecs) > 0 {
 		buf.WriteString(" origin ")
 		buf.WriteString(strings.Join(o.RefSpecs, " "))
@@ -119,6 +124,13 @@ func WithFetchRefSpecs(refs ...string) FetchOption {
 	}
 }
 
+// WithUnshallow will fetch the complete history from the remote
+func WithUnshallow() FetchOption {
+	return func(opts *fetchOptions) {
+		opts.Unshallow = true
+	}
+}
+
 // Fetch all remote changes from a remote repository without integrating (merging)
 // them into the current repository (working directory). Ensures the current repository
 // only tracks the latest remote changes

fetch_test.go

@@ -92,3 +92,20 @@ func TestFetchWithFetchRefSpecs(t *testing.T) {
 	require.Len(t, dlog, 1)
 	assert.Equal(t, "test: add test for validating refspecs", dlog[0].Message)
 }
+
+func TestFetchWithUnshallow(t *testing.T) {
+	log := `(main, origin/main) fifth feature
+feat: fourth feature
+feat: third feature
+feat: second feature
+feat: first feature`
+	gittest.InitRepository(t, gittest.WithRemoteLog(log))
+	shallowClone(t, gittest.Remote(t))
+
+	client, _ := git.NewClient()
+	_, err := client.Fetch(git.WithUnshallow())
+	require.NoError(t, err)
+
+	glog := gittest.Log(t)
+	assert.Len(t, glog, 6)
+}