5 files changed, 22 insertions, 9 deletions
diff --git a/plumbing/protocol/packp/common.go b/plumbing/protocol/packp/common.go
index ab07ac8..fef50a4 100644
--- a/plumbing/protocol/packp/common.go
+++ b/plumbing/protocol/packp/common.go
@@ -19,7 +19,6 @@ var (
 	// common
 	sp  = []byte(" ")
 	eol = []byte("\n")
-	eq  = []byte{'='}
 
 	// advertised-refs
 	null       = []byte("\x00")
diff --git a/plumbing/protocol/packp/updreq.go b/plumbing/protocol/packp/updreq.go
index 46ad6fd..5dbd8ac 100644
--- a/plumbing/protocol/packp/updreq.go
+++ b/plumbing/protocol/packp/updreq.go
@@ -87,9 +87,9 @@ type Action string
 
 const (
 	Create  Action = "create"
-	Update         = "update"
-	Delete         = "delete"
-	Invalid        = "invalid"
+	Update  Action = "update"
+	Delete  Action = "delete"
+	Invalid Action = "invalid"
 )
 
 type Command struct {
diff --git a/plumbing/protocol/packp/updreq_encode.go b/plumbing/protocol/packp/updreq_encode.go
index 08a819e..1205cfa 100644
--- a/plumbing/protocol/packp/updreq_encode.go
+++ b/plumbing/protocol/packp/updreq_encode.go
@@ -9,10 +9,6 @@ import (
 	"github.com/go-git/go-git/v5/plumbing/protocol/packp/capability"
 )
 
-var (
-	zeroHashString = plumbing.ZeroHash.String()
-)
-
 // Encode writes the ReferenceUpdateRequest encoding to the stream.
 func (req *ReferenceUpdateRequest) Encode(w io.Writer) error {
 	if err := req.validate(); err != nil {
diff --git a/plumbing/protocol/packp/updreq_encode_test.go b/plumbing/protocol/packp/updreq_encode_test.go
index 6ba0043..4370b79 100644
--- a/plumbing/protocol/packp/updreq_encode_test.go
+++ b/plumbing/protocol/packp/updreq_encode_test.go
@@ -170,3 +170,22 @@ func (s *UpdReqEncodeSuite) TestPushOptions(c *C) {
 
 	s.testEncode(c, r, expected)
 }
+
+func (s *UpdReqEncodeSuite) TestPushAtomic(c *C) {
+	hash1 := plumbing.NewHash("1ecf0ef2c2dffb796033e5a02219af86ec6584e5")
+	hash2 := plumbing.NewHash("2ecf0ef2c2dffb796033e5a02219af86ec6584e5")
+	name := plumbing.ReferenceName("myref")
+
+	r := NewReferenceUpdateRequest()
+	r.Capabilities.Set(capability.Atomic)
+	r.Commands = []*Command{
+		{Name: name, Old: hash1, New: hash2},
+	}
+
+	expected := pktlines(c,
+		"1ecf0ef2c2dffb796033e5a02219af86ec6584e5 2ecf0ef2c2dffb796033e5a02219af86ec6584e5 myref\x00atomic",
+		pktline.FlushString,
+	)
+
+	s.testEncode(c, r, expected)
+}
diff --git a/plumbing/protocol/packp/uppackresp.go b/plumbing/protocol/packp/uppackresp.go
index a9a7192..26ae61e 100644
--- a/plumbing/protocol/packp/uppackresp.go
+++ b/plumbing/protocol/packp/uppackresp.go
@@ -24,7 +24,6 @@ type UploadPackResponse struct {
 	r          io.ReadCloser
 	isShallow  bool
 	isMultiACK bool
-	isOk       bool
 }
 
 // NewUploadPackResponse create a new UploadPackResponse instance, the request