FindTag RPC

7 files changed, 668 insertions, 154 deletions

diff --git a/changelogs/unreleased/jc-find-tag.yml b/changelogs/unreleased/jc-find-tag.yml
new file mode 100644
index 000000000..023377cf0
--- /dev/null
+++ b/changelogs/unreleased/jc-find-tag.yml
@@ -0,0 +1,5 @@
+---
+title: FindTag RPC
+merge_request: 1409
+author:
+type: performance
diff --git a/internal/service/ref/refs.go b/internal/service/ref/refs.go
index 267f29855..9cd32faf7 100644
--- a/internal/service/ref/refs.go
+++ b/internal/service/ref/refs.go
@@ -17,6 +17,10 @@ import (
 	"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
 )
 
+const (
+	tagFormat = "%(objectname) %(objecttype) %(refname:lstrip=2)"
+)
+
 var (
 	master = []byte("refs/heads/master")
 
@@ -74,7 +78,7 @@ func (t *tagSender) Send() error {
 }
 
 func parseAndReturnTags(ctx context.Context, repo *gitalypb.Repository, stream gitalypb.RefService_FindAllTagsServer) error {
-	tagsCmd, err := git.Command(ctx, repo, "for-each-ref", "--format", "%(objectname) %(objecttype) %(refname:lstrip=2)", "refs/tags/")
+	tagsCmd, err := git.Command(ctx, repo, "for-each-ref", "--format", tagFormat, "refs/tags/")
 	if err != nil {
 		return fmt.Errorf("for-each-ref error: %v", err)
 	}
@@ -88,30 +92,9 @@ func parseAndReturnTags(ctx context.Context, repo *gitalypb.Repository, stream g
 
 	scanner := bufio.NewScanner(tagsCmd)
 	for scanner.Scan() {
-		fields := strings.SplitN(scanner.Text(), " ", 3)
-		if len(fields) != 3 {
-			return fmt.Errorf("invalid output from for-each-ref command: %v", scanner.Text())
-		}
-
-		tagID, refType, refName := fields[0], fields[1], fields[2]
-
-		tag := &gitalypb.Tag{
-			Id:   tagID,
-			Name: []byte(refName),
-		}
-		switch refType {
-		// annotated tag
-		case "tag":
-			tag, err = gitlog.GetTagCatfile(c, tagID, refName)
-			if err != nil {
-				return fmt.Errorf("getting annotated tag: %v", err)
-			}
-		case "commit":
-			commit, err := gitlog.GetCommitCatfile(c, tagID)
-			if err != nil {
-				return fmt.Errorf("getting commit catfile: %v", err)
-			}
-			tag.TargetCommit = commit
+		tag, err := parseTagLine(c, scanner.Text())
+		if err != nil {
+			return fmt.Errorf("parsing tag: %v", err)
 		}
 
 		if err := tagChunker.Send(tag); err != nil {
@@ -344,3 +327,97 @@ func findAllBranches(in *gitalypb.FindAllBranchesRequest, stream gitalypb.RefSer
 
 	return findRefs(ctx, writer, in.Repository, patterns, opts)
 }
+
+func (s *server) FindTag(ctx context.Context, in *gitalypb.FindTagRequest) (*gitalypb.FindTagResponse, error) {
+	var err error
+	if err = validateFindTagRequest(in); err != nil {
+		return nil, helper.ErrInvalidArgument(err)
+	}
+
+	var tag *gitalypb.Tag
+
+	if tag, err = findTag(ctx, in.GetRepository(), in.GetTagName()); err != nil {
+		return nil, helper.ErrInternal(err)
+	}
+
+	return &gitalypb.FindTagResponse{Tag: tag}, nil
+}
+
+// parseTagLine parses a line of text with the output format %(objectname) %(objecttype) %(refname:lstrip=2)
+func parseTagLine(c *catfile.Batch, tagLine string) (*gitalypb.Tag, error) {
+	fields := strings.SplitN(tagLine, " ", 3)
+	if len(fields) != 3 {
+		return nil, fmt.Errorf("invalid output from for-each-ref command: %v", tagLine)
+	}
+
+	tagID, refType, refName := fields[0], fields[1], fields[2]
+
+	tag := &gitalypb.Tag{
+		Id:   tagID,
+		Name: []byte(refName),
+	}
+
+	switch refType {
+	// annotated tag
+	case "tag":
+		tag, err := gitlog.GetTagCatfile(c, tagID, refName)
+		if err != nil {
+			return nil, fmt.Errorf("getting annotated tag: %v", err)
+		}
+		return tag, nil
+	case "commit":
+		commit, err := gitlog.GetCommitCatfile(c, tagID)
+		if err != nil {
+			return nil, fmt.Errorf("getting commit catfile: %v", err)
+		}
+		tag.TargetCommit = commit
+		return tag, nil
+	default:
+		return tag, nil
+	}
+}
+
+func findTag(ctx context.Context, repository *gitalypb.Repository, tagName []byte) (*gitalypb.Tag, error) {
+	tagCmd, err := git.Command(ctx, repository, "tag", "-l", "--format", tagFormat, string(tagName))
+	if err != nil {
+		return nil, fmt.Errorf("for-each-ref error: %v", err)
+	}
+
+	c, err := catfile.New(ctx, repository)
+	if err != nil {
+		return nil, err
+	}
+
+	var tag *gitalypb.Tag
+
+	scanner := bufio.NewScanner(tagCmd)
+	if scanner.Scan() {
+		tag, err = parseTagLine(c, scanner.Text())
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		return nil, errors.New("no tag found")
+	}
+
+	if err = tagCmd.Wait(); err != nil {
+		return nil, err
+	}
+
+	return tag, nil
+}
+
+func validateFindTagRequest(in *gitalypb.FindTagRequest) error {
+	if in.GetRepository() == nil {
+		return errors.New("repository is empty")
+	}
+
+	if _, err := helper.GetRepoPath(in.GetRepository()); err != nil {
+		return fmt.Errorf("invalid git directory: %v", err)
+	}
+
+	if in.GetTagName() == nil {
+		return errors.New("tag name is empty")
+	}
+	return nil
+}
diff --git a/internal/service/ref/refs_test.go b/internal/service/ref/refs_test.go
index 6108dfb85..f882f4d4c 100644
--- a/internal/service/ref/refs_test.go
+++ b/internal/service/ref/refs_test.go
@@ -1278,3 +1278,283 @@ func TestListBranchNamesContainingCommit(t *testing.T) {
 		})
 	}
 }
+
+func TestSuccessfulFindTagRequest(t *testing.T) {
+	server, serverSocketPath := runRefServiceServer(t)
+	defer server.Stop()
+
+	testRepoCopy, testRepoCopyPath, cleanupFn := testhelper.NewTestRepoWithWorktree(t)
+	defer cleanupFn()
+
+	blobID := "faaf198af3a36dbf41961466703cc1d47c61d051"
+	commitID := "6f6d7e7ed97bb5f0054f2b1df789b39ca89b6ff9"
+
+	gitCommit := &gitalypb.GitCommit{
+		Id:      commitID,
+		Subject: []byte("More submodules"),
+		Body:    []byte("More submodules\n\nSigned-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>\n"),
+		Author: &gitalypb.CommitAuthor{
+			Name:  []byte("Dmitriy Zaporozhets"),
+			Email: []byte("dmitriy.zaporozhets@gmail.com"),
+			Date:  &timestamp.Timestamp{Seconds: 1393491261},
+		},
+		Committer: &gitalypb.CommitAuthor{
+			Name:  []byte("Dmitriy Zaporozhets"),
+			Email: []byte("dmitriy.zaporozhets@gmail.com"),
+			Date:  &timestamp.Timestamp{Seconds: 1393491261},
+		},
+		ParentIds: []string{"d14d6c0abdd253381df51a723d58691b2ee1ab08"},
+		BodySize:  84,
+	}
+
+	ctx, cancel := testhelper.Context()
+	defer cancel()
+
+	bigCommitID := testhelper.CreateCommit(t, testRepoCopyPath, "local-big-commits", &testhelper.CreateCommitOpts{
+		Message:  "An empty commit with REALLY BIG message\n\n" + strings.Repeat("a", helper.MaxCommitOrTagMessageSize+1),
+		ParentID: "60ecb67744cb56576c30214ff52294f8ce2def98",
+	})
+	bigCommit, err := log.GetCommit(ctx, testRepoCopy, bigCommitID)
+	require.NoError(t, err)
+
+	annotatedTagID := testhelper.CreateTag(t, testRepoCopyPath, "v1.2.0", blobID, &testhelper.CreateTagOpts{Message: "Blob tag"})
+
+	testhelper.CreateTag(t, testRepoCopyPath, "v1.3.0", commitID, nil)
+	testhelper.CreateTag(t, testRepoCopyPath, "v1.4.0", blobID, nil)
+
+	// To test recursive resolving to a commit
+	testhelper.CreateTag(t, testRepoCopyPath, "v1.5.0", "v1.3.0", nil)
+
+	// A tag to commit with a big message
+	testhelper.CreateTag(t, testRepoCopyPath, "v1.6.0", bigCommitID, nil)
+
+	// A tag with a big message
+	bigMessage := strings.Repeat("a", 11*1024)
+	bigMessageTag1ID := testhelper.CreateTag(t, testRepoCopyPath, "v1.7.0", commitID, &testhelper.CreateTagOpts{Message: bigMessage})
+
+	// A tag with a commit id as its name
+	commitTagID := testhelper.CreateTag(t, testRepoCopyPath, commitID, commitID, &testhelper.CreateTagOpts{Message: "commit tag with a commit sha as the name"})
+
+	// a tag of a tag
+	tagOfTagID := testhelper.CreateTag(t, testRepoCopyPath, "tag-of-tag", commitTagID, &testhelper.CreateTagOpts{Message: "tag of a tag"})
+
+	client, conn := newRefServiceClient(t, serverSocketPath)
+	defer conn.Close()
+
+	expectedTags := []*gitalypb.Tag{
+		{
+			Name:         []byte(commitID),
+			Id:           string(commitTagID),
+			TargetCommit: gitCommit,
+			Message:      []byte("commit tag with a commit sha as the name"),
+			MessageSize:  40,
+		},
+		{
+			Name:         []byte("tag-of-tag"),
+			Id:           string(tagOfTagID),
+			TargetCommit: gitCommit,
+			Message:      []byte("tag of a tag"),
+			MessageSize:  12,
+		},
+		{
+			Name:         []byte("v1.0.0"),
+			Id:           "f4e6814c3e4e7a0de82a9e7cd20c626cc963a2f8",
+			TargetCommit: gitCommit,
+			Message:      []byte("Release"),
+			MessageSize:  7,
+		},
+		{
+			Name: []byte("v1.1.0"),
+			Id:   "8a2a6eb295bb170b34c24c76c49ed0e9b2eaf34b",
+			TargetCommit: &gitalypb.GitCommit{
+				Id:      "5937ac0a7beb003549fc5fd26fc247adbce4a52e",
+				Subject: []byte("Add submodule from gitlab.com"),
+				Body:    []byte("Add submodule from gitlab.com\n\nSigned-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>\n"),
+				Author: &gitalypb.CommitAuthor{
+					Name:  []byte("Dmitriy Zaporozhets"),
+					Email: []byte("dmitriy.zaporozhets@gmail.com"),
+					Date:  &timestamp.Timestamp{Seconds: 1393491698},
+				},
+				Committer: &gitalypb.CommitAuthor{
+					Name:  []byte("Dmitriy Zaporozhets"),
+					Email: []byte("dmitriy.zaporozhets@gmail.com"),
+					Date:  &timestamp.Timestamp{Seconds: 1393491698},
+				},
+				ParentIds: []string{"570e7b2abdd848b95f2f578043fc23bd6f6fd24d"},
+				BodySize:  98,
+			},
+			Message:     []byte("Version 1.1.0"),
+			MessageSize: 13,
+		},
+		{
+			Name:        []byte("v1.2.0"),
+			Id:          string(annotatedTagID),
+			Message:     []byte("Blob tag"),
+			MessageSize: 8,
+		},
+		{
+			Name:         []byte("v1.3.0"),
+			Id:           string(commitID),
+			TargetCommit: gitCommit,
+		},
+		{
+			Name: []byte("v1.4.0"),
+			Id:   string(blobID),
+		},
+		{
+			Name:         []byte("v1.5.0"),
+			Id:           string(commitID),
+			TargetCommit: gitCommit,
+		},
+		{
+			Name:         []byte("v1.6.0"),
+			Id:           string(bigCommitID),
+			TargetCommit: bigCommit,
+		},
+		{
+			Name:         []byte("v1.7.0"),
+			Id:           string(bigMessageTag1ID),
+			Message:      []byte(bigMessage[:helper.MaxCommitOrTagMessageSize]),
+			MessageSize:  int64(len(bigMessage)),
+			TargetCommit: gitCommit,
+		},
+	}
+
+	for _, expectedTag := range expectedTags {
+
+		rpcRequest := &gitalypb.FindTagRequest{Repository: testRepoCopy, TagName: expectedTag.Name}
+
+		resp, err := client.FindTag(ctx, rpcRequest)
+		require.NoError(t, err)
+
+		require.Equal(t, expectedTag, resp.GetTag())
+	}
+}
+
+func TestFindTagNestedTag(t *testing.T) {
+	server, serverSocketPath := runRefServiceServer(t)
+	defer server.Stop()
+
+	testRepoCopy, testRepoCopyPath, cleanupFn := testhelper.NewTestRepoWithWorktree(t)
+	defer cleanupFn()
+
+	blobID := "faaf198af3a36dbf41961466703cc1d47c61d051"
+	commitID := "6f6d7e7ed97bb5f0054f2b1df789b39ca89b6ff9"
+
+	ctx, cancel := testhelper.Context()
+	defer cancel()
+
+	testCases := []struct {
+		description string
+		depth       int
+		originalOid string
+	}{
+		{
+			description: "nested 1 deep, points to a commit",
+			depth:       1,
+			originalOid: commitID,
+		},
+		{
+			description: "nested 4 deep, points to a commit",
+			depth:       4,
+			originalOid: commitID,
+		},
+		{
+			description: "nested 3 deep, points to a blob",
+			depth:       3,
+			originalOid: blobID,
+		},
+		{
+			description: "nested 20 deep, points to a commit",
+			depth:       20,
+			originalOid: commitID,
+		},
+	}
+
+	for _, tc := range testCases {
+		client, conn := newRefServiceClient(t, serverSocketPath)
+		defer conn.Close()
+
+		t.Run(tc.description, func(t *testing.T) {
+			tags := bytes.NewReader(testhelper.MustRunCommand(t, nil, "git", "-C", testRepoCopyPath, "tag"))
+			testhelper.MustRunCommand(t, tags, "xargs", "git", "-C", testRepoCopyPath, "tag", "-d")
+
+			batch, err := catfile.New(ctx, testRepoCopy)
+			require.NoError(t, err)
+
+			info, err := batch.Info(tc.originalOid)
+			require.NoError(t, err)
+
+			tagID := tc.originalOid
+			var tagName, tagMessage string
+
+			for depth := 0; depth < tc.depth; depth++ {
+				tagName = fmt.Sprintf("tag-depth-%d", depth)
+				tagMessage = fmt.Sprintf("a commit %d deep", depth)
+				tagID = string(testhelper.CreateTag(t, testRepoCopyPath, tagName, tagID, &testhelper.CreateTagOpts{Message: tagMessage}))
+			}
+			expectedTag := &gitalypb.Tag{
+				Name:        []byte(tagName),
+				Id:          string(tagID),
+				Message:     []byte(tagMessage),
+				MessageSize: int64(len([]byte(tagMessage))),
+			}
+			// only expect the TargetCommit to be populated if it is a commit and if its less than 10 tags deep
+			if info.Type == "commit" && tc.depth < log.MaxTagReferenceDepth {
+				commit, err := log.GetCommitCatfile(batch, tc.originalOid)
+				require.NoError(t, err)
+				expectedTag.TargetCommit = commit
+			}
+			rpcRequest := &gitalypb.FindTagRequest{Repository: testRepoCopy, TagName: []byte(tagName)}
+
+			resp, err := client.FindTag(ctx, rpcRequest)
+			require.NoError(t, err)
+			require.Equal(t, expectedTag, resp.GetTag())
+		})
+	}
+}
+
+func TestInvalidFindTagRequest(t *testing.T) {
+	server, serverSocketPath := runRefServiceServer(t)
+	defer server.Stop()
+
+	client, conn := newRefServiceClient(t, serverSocketPath)
+	defer conn.Close()
+
+	testRepo, _, cleanupFn := testhelper.NewTestRepo(t)
+	defer cleanupFn()
+
+	testCases := []struct {
+		desc    string
+		request *gitalypb.FindTagRequest
+	}{
+		{
+			desc:    "empty request",
+			request: &gitalypb.FindTagRequest{},
+		},
+		{
+			desc: "invalid repo",
+			request: &gitalypb.FindTagRequest{
+				Repository: &gitalypb.Repository{
+					StorageName:  "fake",
+					RelativePath: "repo",
+				},
+			},
+		},
+		{
+			desc: "empty tag name",
+			request: &gitalypb.FindTagRequest{
+				Repository: testRepo,
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+			_, err := client.FindTag(ctx, tc.request)
+			testhelper.RequireGrpcError(t, err, codes.InvalidArgument)
+		})
+	}
+}
diff --git a/proto/go/gitalypb/ref.pb.go b/proto/go/gitalypb/ref.pb.go
index 3b74af8a7..85bf911c9 100644
--- a/proto/go/gitalypb/ref.pb.go
+++ b/proto/go/gitalypb/ref.pb.go
@@ -81,7 +81,7 @@ func (x CreateBranchResponse_Status) String() string {
 }
 
 func (CreateBranchResponse_Status) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{21, 0}
+	return fileDescriptor_65d958559ea81b29, []int{23, 0}
 }
 
 type ListNewBlobsRequest struct {
@@ -867,6 +867,92 @@ func (m *FindAllBranchesResponse_Branch) GetTarget() *GitCommit {
 	return nil
 }
 
+type FindTagRequest struct {
+	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
+	TagName              []byte      `protobuf:"bytes,2,opt,name=tag_name,json=tagName,proto3" json:"tag_name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
+	XXX_unrecognized     []byte      `json:"-"`
+	XXX_sizecache        int32       `json:"-"`
+}
+
+func (m *FindTagRequest) Reset()         { *m = FindTagRequest{} }
+func (m *FindTagRequest) String() string { return proto.CompactTextString(m) }
+func (*FindTagRequest) ProtoMessage()    {}
+func (*FindTagRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_65d958559ea81b29, []int{16}
+}
+
+func (m *FindTagRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_FindTagRequest.Unmarshal(m, b)
+}
+func (m *FindTagRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_FindTagRequest.Marshal(b, m, deterministic)
+}
+func (m *FindTagRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_FindTagRequest.Merge(m, src)
+}
+func (m *FindTagRequest) XXX_Size() int {
+	return xxx_messageInfo_FindTagRequest.Size(m)
+}
+func (m *FindTagRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_FindTagRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_FindTagRequest proto.InternalMessageInfo
+
+func (m *FindTagRequest) GetRepository() *Repository {
+	if m != nil {
+		return m.Repository
+	}
+	return nil
+}
+
+func (m *FindTagRequest) GetTagName() []byte {
+	if m != nil {
+		return m.TagName
+	}
+	return nil
+}
+
+type FindTagResponse struct {
+	Tag                  *Tag     `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *FindTagResponse) Reset()         { *m = FindTagResponse{} }
+func (m *FindTagResponse) String() string { return proto.CompactTextString(m) }
+func (*FindTagResponse) ProtoMessage()    {}
+func (*FindTagResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_65d958559ea81b29, []int{17}
+}
+
+func (m *FindTagResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_FindTagResponse.Unmarshal(m, b)
+}
+func (m *FindTagResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_FindTagResponse.Marshal(b, m, deterministic)
+}
+func (m *FindTagResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_FindTagResponse.Merge(m, src)
+}
+func (m *FindTagResponse) XXX_Size() int {
+	return xxx_messageInfo_FindTagResponse.Size(m)
+}
+func (m *FindTagResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_FindTagResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_FindTagResponse proto.InternalMessageInfo
+
+func (m *FindTagResponse) GetTag() *Tag {
+	if m != nil {
+		return m.Tag
+	}
+	return nil
+}
+
 type FindAllTagsRequest struct {
 	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
@@ -878,7 +964,7 @@ func (m *FindAllTagsRequest) Reset()         { *m = FindAllTagsRequest{} }
 func (m *FindAllTagsRequest) String() string { return proto.CompactTextString(m) }
 func (*FindAllTagsRequest) ProtoMessage()    {}
 func (*FindAllTagsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{16}
+	return fileDescriptor_65d958559ea81b29, []int{18}
 }
 
 func (m *FindAllTagsRequest) XXX_Unmarshal(b []byte) error {
@@ -917,7 +1003,7 @@ func (m *FindAllTagsResponse) Reset()         { *m = FindAllTagsResponse{} }
 func (m *FindAllTagsResponse) String() string { return proto.CompactTextString(m) }
 func (*FindAllTagsResponse) ProtoMessage()    {}
 func (*FindAllTagsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{17}
+	return fileDescriptor_65d958559ea81b29, []int{19}
 }
 
 func (m *FindAllTagsResponse) XXX_Unmarshal(b []byte) error {
@@ -958,7 +1044,7 @@ func (m *RefExistsRequest) Reset()         { *m = RefExistsRequest{} }
 func (m *RefExistsRequest) String() string { return proto.CompactTextString(m) }
 func (*RefExistsRequest) ProtoMessage()    {}
 func (*RefExistsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{18}
+	return fileDescriptor_65d958559ea81b29, []int{20}
 }
 
 func (m *RefExistsRequest) XXX_Unmarshal(b []byte) error {
@@ -1004,7 +1090,7 @@ func (m *RefExistsResponse) Reset()         { *m = RefExistsResponse{} }
 func (m *RefExistsResponse) String() string { return proto.CompactTextString(m) }
 func (*RefExistsResponse) ProtoMessage()    {}
 func (*RefExistsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{19}
+	return fileDescriptor_65d958559ea81b29, []int{21}
 }
 
 func (m *RefExistsResponse) XXX_Unmarshal(b []byte) error {
@@ -1045,7 +1131,7 @@ func (m *CreateBranchRequest) Reset()         { *m = CreateBranchRequest{} }
 func (m *CreateBranchRequest) String() string { return proto.CompactTextString(m) }
 func (*CreateBranchRequest) ProtoMessage()    {}
 func (*CreateBranchRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{20}
+	return fileDescriptor_65d958559ea81b29, []int{22}
 }
 
 func (m *CreateBranchRequest) XXX_Unmarshal(b []byte) error {
@@ -1099,7 +1185,7 @@ func (m *CreateBranchResponse) Reset()         { *m = CreateBranchResponse{} }
 func (m *CreateBranchResponse) String() string { return proto.CompactTextString(m) }
 func (*CreateBranchResponse) ProtoMessage()    {}
 func (*CreateBranchResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{21}
+	return fileDescriptor_65d958559ea81b29, []int{23}
 }
 
 func (m *CreateBranchResponse) XXX_Unmarshal(b []byte) error {
@@ -1146,7 +1232,7 @@ func (m *DeleteBranchRequest) Reset()         { *m = DeleteBranchRequest{} }
 func (m *DeleteBranchRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteBranchRequest) ProtoMessage()    {}
 func (*DeleteBranchRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{22}
+	return fileDescriptor_65d958559ea81b29, []int{24}
 }
 
 func (m *DeleteBranchRequest) XXX_Unmarshal(b []byte) error {
@@ -1192,7 +1278,7 @@ func (m *DeleteBranchResponse) Reset()         { *m = DeleteBranchResponse{} }
 func (m *DeleteBranchResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteBranchResponse) ProtoMessage()    {}
 func (*DeleteBranchResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{23}
+	return fileDescriptor_65d958559ea81b29, []int{25}
 }
 
 func (m *DeleteBranchResponse) XXX_Unmarshal(b []byte) error {
@@ -1226,7 +1312,7 @@ func (m *FindBranchRequest) Reset()         { *m = FindBranchRequest{} }
 func (m *FindBranchRequest) String() string { return proto.CompactTextString(m) }
 func (*FindBranchRequest) ProtoMessage()    {}
 func (*FindBranchRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{24}
+	return fileDescriptor_65d958559ea81b29, []int{26}
 }
 
 func (m *FindBranchRequest) XXX_Unmarshal(b []byte) error {
@@ -1272,7 +1358,7 @@ func (m *FindBranchResponse) Reset()         { *m = FindBranchResponse{} }
 func (m *FindBranchResponse) String() string { return proto.CompactTextString(m) }
 func (*FindBranchResponse) ProtoMessage()    {}
 func (*FindBranchResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{25}
+	return fileDescriptor_65d958559ea81b29, []int{27}
 }
 
 func (m *FindBranchResponse) XXX_Unmarshal(b []byte) error {
@@ -1314,7 +1400,7 @@ func (m *DeleteRefsRequest) Reset()         { *m = DeleteRefsRequest{} }
 func (m *DeleteRefsRequest) String() string { return proto.CompactTextString(m) }
 func (*DeleteRefsRequest) ProtoMessage()    {}
 func (*DeleteRefsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{26}
+	return fileDescriptor_65d958559ea81b29, []int{28}
 }
 
 func (m *DeleteRefsRequest) XXX_Unmarshal(b []byte) error {
@@ -1367,7 +1453,7 @@ func (m *DeleteRefsResponse) Reset()         { *m = DeleteRefsResponse{} }
 func (m *DeleteRefsResponse) String() string { return proto.CompactTextString(m) }
 func (*DeleteRefsResponse) ProtoMessage()    {}
 func (*DeleteRefsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{27}
+	return fileDescriptor_65d958559ea81b29, []int{29}
 }
 
 func (m *DeleteRefsResponse) XXX_Unmarshal(b []byte) error {
@@ -1412,7 +1498,7 @@ func (m *ListBranchNamesContainingCommitRequest) Reset() {
 func (m *ListBranchNamesContainingCommitRequest) String() string { return proto.CompactTextString(m) }
 func (*ListBranchNamesContainingCommitRequest) ProtoMessage()    {}
 func (*ListBranchNamesContainingCommitRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{28}
+	return fileDescriptor_65d958559ea81b29, []int{30}
 }
 
 func (m *ListBranchNamesContainingCommitRequest) XXX_Unmarshal(b []byte) error {
@@ -1467,7 +1553,7 @@ func (m *ListBranchNamesContainingCommitResponse) Reset() {
 func (m *ListBranchNamesContainingCommitResponse) String() string { return proto.CompactTextString(m) }
 func (*ListBranchNamesContainingCommitResponse) ProtoMessage()    {}
 func (*ListBranchNamesContainingCommitResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{29}
+	return fileDescriptor_65d958559ea81b29, []int{31}
 }
 
 func (m *ListBranchNamesContainingCommitResponse) XXX_Unmarshal(b []byte) error {
@@ -1510,7 +1596,7 @@ func (m *ListTagNamesContainingCommitRequest) Reset()         { *m = ListTagName
 func (m *ListTagNamesContainingCommitRequest) String() string { return proto.CompactTextString(m) }
 func (*ListTagNamesContainingCommitRequest) ProtoMessage()    {}
 func (*ListTagNamesContainingCommitRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{30}
+	return fileDescriptor_65d958559ea81b29, []int{32}
 }
 
 func (m *ListTagNamesContainingCommitRequest) XXX_Unmarshal(b []byte) error {
@@ -1563,7 +1649,7 @@ func (m *ListTagNamesContainingCommitResponse) Reset()         { *m = ListTagNam
 func (m *ListTagNamesContainingCommitResponse) String() string { return proto.CompactTextString(m) }
 func (*ListTagNamesContainingCommitResponse) ProtoMessage()    {}
 func (*ListTagNamesContainingCommitResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{31}
+	return fileDescriptor_65d958559ea81b29, []int{33}
 }
 
 func (m *ListTagNamesContainingCommitResponse) XXX_Unmarshal(b []byte) error {
@@ -1603,7 +1689,7 @@ func (m *GetTagMessagesRequest) Reset()         { *m = GetTagMessagesRequest{} }
 func (m *GetTagMessagesRequest) String() string { return proto.CompactTextString(m) }
 func (*GetTagMessagesRequest) ProtoMessage()    {}
 func (*GetTagMessagesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{32}
+	return fileDescriptor_65d958559ea81b29, []int{34}
 }
 
 func (m *GetTagMessagesRequest) XXX_Unmarshal(b []byte) error {
@@ -1651,7 +1737,7 @@ func (m *GetTagMessagesResponse) Reset()         { *m = GetTagMessagesResponse{}
 func (m *GetTagMessagesResponse) String() string { return proto.CompactTextString(m) }
 func (*GetTagMessagesResponse) ProtoMessage()    {}
 func (*GetTagMessagesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{33}
+	return fileDescriptor_65d958559ea81b29, []int{35}
 }
 
 func (m *GetTagMessagesResponse) XXX_Unmarshal(b []byte) error {
@@ -1698,7 +1784,7 @@ func (m *ListNewCommitsRequest) Reset()         { *m = ListNewCommitsRequest{} }
 func (m *ListNewCommitsRequest) String() string { return proto.CompactTextString(m) }
 func (*ListNewCommitsRequest) ProtoMessage()    {}
 func (*ListNewCommitsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{34}
+	return fileDescriptor_65d958559ea81b29, []int{36}
 }
 
 func (m *ListNewCommitsRequest) XXX_Unmarshal(b []byte) error {
@@ -1744,7 +1830,7 @@ func (m *ListNewCommitsResponse) Reset()         { *m = ListNewCommitsResponse{}
 func (m *ListNewCommitsResponse) String() string { return proto.CompactTextString(m) }
 func (*ListNewCommitsResponse) ProtoMessage()    {}
 func (*ListNewCommitsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{35}
+	return fileDescriptor_65d958559ea81b29, []int{37}
 }
 
 func (m *ListNewCommitsResponse) XXX_Unmarshal(b []byte) error {
@@ -1784,7 +1870,7 @@ func (m *FindAllRemoteBranchesRequest) Reset()         { *m = FindAllRemoteBranc
 func (m *FindAllRemoteBranchesRequest) String() string { return proto.CompactTextString(m) }
 func (*FindAllRemoteBranchesRequest) ProtoMessage()    {}
 func (*FindAllRemoteBranchesRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{36}
+	return fileDescriptor_65d958559ea81b29, []int{38}
 }
 
 func (m *FindAllRemoteBranchesRequest) XXX_Unmarshal(b []byte) error {
@@ -1830,7 +1916,7 @@ func (m *FindAllRemoteBranchesResponse) Reset()         { *m = FindAllRemoteBran
 func (m *FindAllRemoteBranchesResponse) String() string { return proto.CompactTextString(m) }
 func (*FindAllRemoteBranchesResponse) ProtoMessage()    {}
 func (*FindAllRemoteBranchesResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{37}
+	return fileDescriptor_65d958559ea81b29, []int{39}
 }
 
 func (m *FindAllRemoteBranchesResponse) XXX_Unmarshal(b []byte) error {
@@ -1870,7 +1956,7 @@ func (m *PackRefsRequest) Reset()         { *m = PackRefsRequest{} }
 func (m *PackRefsRequest) String() string { return proto.CompactTextString(m) }
 func (*PackRefsRequest) ProtoMessage()    {}
 func (*PackRefsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{38}
+	return fileDescriptor_65d958559ea81b29, []int{40}
 }
 
 func (m *PackRefsRequest) XXX_Unmarshal(b []byte) error {
@@ -1915,7 +2001,7 @@ func (m *PackRefsResponse) Reset()         { *m = PackRefsResponse{} }
 func (m *PackRefsResponse) String() string { return proto.CompactTextString(m) }
 func (*PackRefsResponse) ProtoMessage()    {}
 func (*PackRefsResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_65d958559ea81b29, []int{39}
+	return fileDescriptor_65d958559ea81b29, []int{41}
 }
 
 func (m *PackRefsResponse) XXX_Unmarshal(b []byte) error {
@@ -1956,6 +2042,8 @@ func init() {
 	proto.RegisterType((*FindAllBranchesRequest)(nil), "gitaly.FindAllBranchesRequest")
 	proto.RegisterType((*FindAllBranchesResponse)(nil), "gitaly.FindAllBranchesResponse")
 	proto.RegisterType((*FindAllBranchesResponse_Branch)(nil), "gitaly.FindAllBranchesResponse.Branch")
+	proto.RegisterType((*FindTagRequest)(nil), "gitaly.FindTagRequest")
+	proto.RegisterType((*FindTagResponse)(nil), "gitaly.FindTagResponse")
 	proto.RegisterType((*FindAllTagsRequest)(nil), "gitaly.FindAllTagsRequest")
 	proto.RegisterType((*FindAllTagsResponse)(nil), "gitaly.FindAllTagsResponse")
 	proto.RegisterType((*RefExistsRequest)(nil), "gitaly.RefExistsRequest")
@@ -1985,110 +2073,113 @@ func init() {
 func init() { proto.RegisterFile("ref.proto", fileDescriptor_65d958559ea81b29) }
 
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+	0x60, 0x71, 0x19, 0x79, 0x21, 0x04, 0x2b, 0x1b, 0xc0, 0xda, 0x73, 0xea, 0x23, 0xbd, 0xa2, 0x9e,
+	0x67, 0x98, 0xb3, 0x5d, 0xdc, 0x1b, 0xe0, 0xdf, 0x37, 0xba, 0xd5, 0x16, 0x65, 0x95, 0xf5, 0xaf,
+	0x37, 0xf3, 0xa8, 0xed, 0xfb, 0x4a, 0xa9, 0x73, 0x24, 0x0c, 0x06, 0xff, 0x09, 0xd6, 0x47, 0xdd,
+	0xca, 0x98, 0x8b, 0xb0, 0xd8, 0x15, 0xb2, 0xe0, 0x0a, 0x93, 0x43, 0xb4, 0xe6, 0x5f, 0xa7, 0x3e,
+	0x3a, 0x4f, 0x46, 0x96, 0x2c, 0x70, 0x70, 0xb1, 0x0e, 0x32, 0xbc, 0xf8, 0xf0, 0x19, 0xac, 0xc9,
+	0x77, 0x9c, 0xc8, 0xc6, 0x27, 0x7b, 0x47, 0xe2, 0x2a, 0xac, 0x8f, 0x7a, 0x92, 0x8b, 0x78, 0x04,
+	0x8b, 0x42, 0x2b, 0xb8, 0xdd, 0x12, 0xae, 0xfe, 0x40, 0x03, 0x7b, 0xe2, 0x7d, 0x58, 0xb1, 0x6d,
+	0x42, 0xbb, 0x4e, 0xd0, 0xbb, 0x66, 0xa6, 0x50, 0x2e, 0x07, 0x0b, 0xc9, 0x40, 0xd6, 0x57, 0xf0,
+	0x45, 0x9c, 0x0f, 0xbc, 0x14, 0x0f, 0xc8, 0x04, 0xa7, 0x72, 0x09, 0x3f, 0x1b, 0xa3, 0x47, 0xa3,
+	0x1d, 0x2c, 0xa4, 0xe1, 0x7f, 0x87, 0xa5, 0x53, 0xa3, 0xf5, 0xcf, 0x59, 0x1b, 0xd8, 0x26, 0x64,
+	0x0c, 0xdb, 0xd6, 0x79, 0x5b, 0x12, 0xa4, 0x6f, 0xd1, 0xf0, 0xe3, 0xeb, 0x78, 0x18, 0x81, 0x1a,
+	0x7a, 0x10, 0x11, 0x96, 0xff, 0xbb, 0x04, 0x40, 0x68, 0xa7, 0x4e, 0xdd, 0xf7, 0x56, 0x8b, 0x22,
+	0x07, 0xd6, 0x12, 0x9f, 0xc4, 0xe8, 0x6e, 0x94, 0xd6, 0x4d, 0x7a, 0x85, 0x6b, 0xf7, 0x2e, 0xd1,
+	0x92, 0x37, 0x49, 0xf6, 0xdb, 0x2f, 0x77, 0x17, 0x32, 0x29, 0x4d, 0x79, 0x8a, 0xce, 0x86, 0x04,
+	0x29, 0xd2, 0x6b, 0xd0, 0xed, 0x44, 0x12, 0x19, 0x7d, 0xe8, 0x6a, 0x78, 0x9a, 0xca, 0x98, 0x9f,
+	0x27, 0x0a, 0xd2, 0x05, 0x79, 0x8b, 0xbc, 0x72, 0xd1, 0xad, 0x11, 0x8c, 0x91, 0xc7, 0xb4, 0xb6,
+	0x3d, 0x71, 0x3e, 0xc9, 0xc1, 0x1f, 0x20, 0x17, 0x79, 0x96, 0x22, 0x2d, 0x6a, 0x1c, 0x7f, 0x2a,
+	0x6b, 0x5b, 0x89, 0x73, 0xe3, 0xd9, 0xa1, 0xe2, 0xca, 0x8d, 0x3d, 0xfa, 0xd0, 0xce, 0x65, 0x2f,
+	0x4e, 0xed, 0xf6, 0x14, 0x8d, 0xe9, 0xa9, 0x19, 0x3a, 0xb9, 0x35, 0x91, 0xc6, 0x27, 0xa7, 0x66,
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+	0x7c, 0x3c, 0xc7, 0xef, 0x44, 0xc9, 0x8f, 0x1d, 0xe2, 0x78, 0xc9, 0x4f, 0x6a, 0x2c, 0xf1, 0x92,
+	0x9f, 0xd8, 0x09, 0xe2, 0x91, 0xbf, 0x84, 0xec, 0x90, 0x39, 0xa3, 0x62, 0x78, 0xa0, 0xe3, 0x34,
+	0x5d, 0xdb, 0x4c, 0x98, 0x19, 0x8f, 0xbf, 0x01, 0xf9, 0x28, 0x59, 0x45, 0x5b, 0xc9, 0x14, 0x56,
+	0x40, 0xde, 0x98, 0xc6, 0x6f, 0x25, 0xaa, 0x22, 0x51, 0xa3, 0x24, 0x30, 0x44, 0x4d, 0x60, 0x9e,
+	0x21, 0x6a, 0x22, 0x6f, 0x8c, 0xa0, 0xd6, 0x00, 0x42, 0x96, 0x87, 0x36, 0xa3, 0xa9, 0x8b, 0x23,
+	0x6a, 0x49, 0x53, 0xe3, 0x6b, 0xaf, 0x01, 0x84, 0x5c, 0x2b, 0xc4, 0x1b, 0xa3, 0x82, 0x21, 0xde,
+	0x38, 0x35, 0x8b, 0xc6, 0xf7, 0x51, 0x81, 0xed, 0x4b, 0x78, 0x0f, 0x2a, 0x05, 0x50, 0x57, 0x63,
+	0x6c, 0xda, 0xde, 0x95, 0xf5, 0x93, 0x4a, 0xe5, 0x7f, 0x0a, 0xdc, 0x98, 0x46, 0x53, 0xd0, 0xa3,
+	0x28, 0xfc, 0x25, 0xd4, 0x4a, 0x7b, 0x7c, 0x35, 0xe5, 0xa4, 0x40, 0xfe, 0x0a, 0x85, 0x38, 0xd9,
+	0x40, 0x37, 0x87, 0xd7, 0x71, 0x12, 0xf7, 0xd1, 0x6e, 0x4d, 0x9a, 0x9e, 0x80, 0x1e, 0x67, 0x01,
+	0x21, 0x7a, 0x22, 0x0f, 0x09, 0xd1, 0x93, 0xc9, 0x43, 0x1c, 0xfd, 0x35, 0xe4, 0xa3, 0x5f, 0xa5,
+	0xc3, 0x62, 0x4e, 0xf8, 0x52, 0x1e, 0x16, 0x73, 0xd2, 0x87, 0xec, 0x38, 0xee, 0x0b, 0xc8, 0x04,
+	0x17, 0x2a, 0x1a, 0xb6, 0x9a, 0x91, 0x4b, 0x5c, 0x2b, 0x8e, 0x4f, 0x8c, 0x15, 0xde, 0xfe, 0x93,
+	0x3f, 0xfb, 0x5a, 0xb6, 0xd1, 0x2c, 0xb5, 0x9c, 0xee, 0x9e, 0xf8, 0xfb, 0x73, 0xc7, 0x35, 0xf7,
+	0x84, 0xad, 0xf8, 0xdc, 0xbf, 0x67, 0x3a, 0x72, 0xdc, 0x6f, 0x36, 0xd3, 0x5c, 0xf4, 0xec, 0xbb,
+	0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x4b, 0x81, 0x9a, 0x3e, 0x18, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -2112,6 +2203,7 @@ type RefServiceClient interface {
 	FindLocalBranches(ctx context.Context, in *FindLocalBranchesRequest, opts ...grpc.CallOption) (RefService_FindLocalBranchesClient, error)
 	FindAllBranches(ctx context.Context, in *FindAllBranchesRequest, opts ...grpc.CallOption) (RefService_FindAllBranchesClient, error)
 	FindAllTags(ctx context.Context, in *FindAllTagsRequest, opts ...grpc.CallOption) (RefService_FindAllTagsClient, error)
+	FindTag(ctx context.Context, in *FindTagRequest, opts ...grpc.CallOption) (*FindTagResponse, error)
 	FindAllRemoteBranches(ctx context.Context, in *FindAllRemoteBranchesRequest, opts ...grpc.CallOption) (RefService_FindAllRemoteBranchesClient, error)
 	RefExists(ctx context.Context, in *RefExistsRequest, opts ...grpc.CallOption) (*RefExistsResponse, error)
 	CreateBranch(ctx context.Context, in *CreateBranchRequest, opts ...grpc.CallOption) (*CreateBranchResponse, error)
@@ -2313,6 +2405,15 @@ func (x *refServiceFindAllTagsClient) Recv() (*FindAllTagsResponse, error) {
 	return m, nil
 }
 
+func (c *refServiceClient) FindTag(ctx context.Context, in *FindTagRequest, opts ...grpc.CallOption) (*FindTagResponse, error) {
+	out := new(FindTagResponse)
+	err := c.cc.Invoke(ctx, "/gitaly.RefService/FindTag", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *refServiceClient) FindAllRemoteBranches(ctx context.Context, in *FindAllRemoteBranchesRequest, opts ...grpc.CallOption) (RefService_FindAllRemoteBranchesClient, error) {
 	stream, err := c.cc.NewStream(ctx, &_RefService_serviceDesc.Streams[5], "/gitaly.RefService/FindAllRemoteBranches", opts...)
 	if err != nil {
@@ -2570,6 +2671,7 @@ type RefServiceServer interface {
 	FindLocalBranches(*FindLocalBranchesRequest, RefService_FindLocalBranchesServer) error
 	FindAllBranches(*FindAllBranchesRequest, RefService_FindAllBranchesServer) error
 	FindAllTags(*FindAllTagsRequest, RefService_FindAllTagsServer) error
+	FindTag(context.Context, *FindTagRequest) (*FindTagResponse, error)
 	FindAllRemoteBranches(*FindAllRemoteBranchesRequest, RefService_FindAllRemoteBranchesServer) error
 	RefExists(context.Context, *RefExistsRequest) (*RefExistsResponse, error)
 	CreateBranch(context.Context, *CreateBranchRequest) (*CreateBranchResponse, error)
@@ -2610,6 +2712,9 @@ func (*UnimplementedRefServiceServer) FindAllBranches(req *FindAllBranchesReques
 func (*UnimplementedRefServiceServer) FindAllTags(req *FindAllTagsRequest, srv RefService_FindAllTagsServer) error {
 	return status.Errorf(codes.Unimplemented, "method FindAllTags not implemented")
 }
+func (*UnimplementedRefServiceServer) FindTag(ctx context.Context, req *FindTagRequest) (*FindTagResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method FindTag not implemented")
+}
 func (*UnimplementedRefServiceServer) FindAllRemoteBranches(req *FindAllRemoteBranchesRequest, srv RefService_FindAllRemoteBranchesServer) error {
 	return status.Errorf(codes.Unimplemented, "method FindAllRemoteBranches not implemented")
 }
@@ -2792,6 +2897,24 @@ func (x *refServiceFindAllTagsServer) Send(m *FindAllTagsResponse) error {
 	return x.ServerStream.SendMsg(m)
 }
 
+func _RefService_FindTag_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(FindTagRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RefServiceServer).FindTag(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/gitaly.RefService/FindTag",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RefServiceServer).FindTag(ctx, req.(*FindTagRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _RefService_FindAllRemoteBranches_Handler(srv interface{}, stream grpc.ServerStream) error {
 	m := new(FindAllRemoteBranchesRequest)
 	if err := stream.RecvMsg(m); err != nil {
@@ -3039,6 +3162,10 @@ var _RefService_serviceDesc = grpc.ServiceDesc{
 			Handler:    _RefService_FindRefName_Handler,
 		},
 		{
+			MethodName: "FindTag",
+			Handler:    _RefService_FindTag_Handler,
+		},
+		{
 			MethodName: "RefExists",
 			Handler:    _RefService_RefExists_Handler,
 		},
diff --git a/proto/ref.proto b/proto/ref.proto
index 7fccadcb9..37b5bd225 100644
--- a/proto/ref.proto
+++ b/proto/ref.proto
@@ -54,6 +54,12 @@ service RefService {
       target_repository_field: "1"
     };
   }
+  rpc FindTag(FindTagRequest) returns (FindTagResponse) {
+    option (op_type) = {
+      op: ACCESSOR
+      target_repository_field: "1"
+    };
+  }
   rpc FindAllRemoteBranches(FindAllRemoteBranchesRequest) returns (stream FindAllRemoteBranchesResponse) {
     option (op_type) = {
       op: ACCESSOR
@@ -227,6 +233,15 @@ message FindAllBranchesResponse {
   repeated Branch branches = 1;
 }
 
+message FindTagRequest {
+  Repository repository = 1;
+  bytes tag_name = 2;
+}
+
+message FindTagResponse {
+  Tag tag = 1;
+}
+
 message FindAllTagsRequest {
   Repository repository = 1;
 }
diff --git a/ruby/proto/gitaly/ref_pb.rb b/ruby/proto/gitaly/ref_pb.rb
index 760d969e1..758e3a84f 100644
--- a/ruby/proto/gitaly/ref_pb.rb
+++ b/ruby/proto/gitaly/ref_pb.rb
@@ -77,6 +77,13 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
     optional :name, :bytes, 1
     optional :target, :message, 2, "gitaly.GitCommit"
   end
+  add_message "gitaly.FindTagRequest" do
+    optional :repository, :message, 1, "gitaly.Repository"
+    optional :tag_name, :bytes, 2
+  end
+  add_message "gitaly.FindTagResponse" do
+    optional :tag, :message, 1, "gitaly.Tag"
+  end
   add_message "gitaly.FindAllTagsRequest" do
     optional :repository, :message, 1, "gitaly.Repository"
   end
@@ -191,6 +198,8 @@ module Gitaly
   FindAllBranchesRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindAllBranchesRequest").msgclass
   FindAllBranchesResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindAllBranchesResponse").msgclass
   FindAllBranchesResponse::Branch = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindAllBranchesResponse.Branch").msgclass
+  FindTagRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindTagRequest").msgclass
+  FindTagResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindTagResponse").msgclass
   FindAllTagsRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindAllTagsRequest").msgclass
   FindAllTagsResponse = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.FindAllTagsResponse").msgclass
   RefExistsRequest = Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.RefExistsRequest").msgclass
diff --git a/ruby/proto/gitaly/ref_services_pb.rb b/ruby/proto/gitaly/ref_services_pb.rb
index 04ff21f8d..a74ef2d38 100644
--- a/ruby/proto/gitaly/ref_services_pb.rb
+++ b/ruby/proto/gitaly/ref_services_pb.rb
@@ -23,6 +23,7 @@ module Gitaly
       rpc :FindLocalBranches, FindLocalBranchesRequest, stream(FindLocalBranchesResponse)
       rpc :FindAllBranches, FindAllBranchesRequest, stream(FindAllBranchesResponse)
       rpc :FindAllTags, FindAllTagsRequest, stream(FindAllTagsResponse)
+      rpc :FindTag, FindTagRequest, FindTagResponse
       rpc :FindAllRemoteBranches, FindAllRemoteBranchesRequest, stream(FindAllRemoteBranchesResponse)
       rpc :RefExists, RefExistsRequest, RefExistsResponse
       rpc :CreateBranch, CreateBranchRequest, CreateBranchResponse