commit: Add CheckObjectsExist RPCjc-filter-nonexisting-revisions

When pushing commits to a repository, access checks are run. In order to
use the quarantine directory, we need a way to filter out revisions that
a repository already has in the case that a packfile sends over objects
that already exists on the server. In this case, we don't need to check
the access.

Add an RPC that when given a list of revisions, returns the ones that
already exist in the repository, and the ones that do not exist in the
repository.

Changelog: added

7 files changed, 738 insertions, 248 deletions

diff --git a/internal/gitaly/service/commit/check_objects_exist.go b/internal/gitaly/service/commit/check_objects_exist.go
new file mode 100644
index 000000000..1d15730e8
--- /dev/null
+++ b/internal/gitaly/service/commit/check_objects_exist.go
@@ -0,0 +1,88 @@
+package commit
+
+import (
+	"context"
+	"io"
+
+	"gitlab.com/gitlab-org/gitaly/v14/internal/git"
+	"gitlab.com/gitlab-org/gitaly/v14/internal/git/catfile"
+	"gitlab.com/gitlab-org/gitaly/v14/internal/helper"
+	"gitlab.com/gitlab-org/gitaly/v14/proto/go/gitalypb"
+)
+
+func (s *server) CheckObjectsExist(
+	stream gitalypb.CommitService_CheckObjectsExistServer,
+) error {
+	ctx := stream.Context()
+	firstRequest := true
+	var objectInfoReader catfile.ObjectInfoReader
+	var request *gitalypb.CheckObjectsExistRequest
+
+	for {
+		request, err := stream.Recv()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+
+		if firstRequest {
+			firstRequest = false
+			if err := validateCheckObjectsExistRequest(request); err != nil {
+				return err
+			}
+
+			repo := s.localrepo(request.GetRepository())
+
+			if objectInfoReader, err = s.catfileCache.ObjectInfoReader(ctx, repo); err != nil {
+				return err
+			}
+		}
+
+		if err = checkObjectsExist(ctx, request, objectInfoReader, stream); err != nil {
+			return err
+		}
+	}
+
+	return checkObjectsExist(ctx, request, objectInfoReader, stream)
+}
+
+func checkObjectsExist(
+	ctx context.Context,
+	request *gitalypb.CheckObjectsExistRequest,
+	objectInfoReader catfile.ObjectInfoReader,
+	stream gitalypb.CommitService_CheckObjectsExistServer,
+) error {
+	var existingRevisions, missingRevisions [][]byte
+
+	revisions := request.GetRevisions()
+
+	for _, revision := range revisions {
+		_, err := objectInfoReader.Info(ctx, git.Revision(revision))
+		if err != nil {
+			if catfile.IsNotFound(err) {
+				missingRevisions = append(missingRevisions, revision)
+				continue
+			}
+
+			return err
+		}
+		existingRevisions = append(existingRevisions, revision)
+	}
+
+	return stream.Send(&gitalypb.CheckObjectsExistResponse{
+		ExistingRevisions: existingRevisions,
+		MissingRevisions:  missingRevisions,
+	})
+}
+
+func validateCheckObjectsExistRequest(in *gitalypb.CheckObjectsExistRequest) error {
+	for _, revision := range in.GetRevisions() {
+		if err := git.ValidateRevision(revision); err != nil {
+			return helper.ErrInvalidArgument(err)
+		}
+	}
+
+	return nil
+}
diff --git a/internal/gitaly/service/commit/check_objects_exist_test.go b/internal/gitaly/service/commit/check_objects_exist_test.go
new file mode 100644
index 000000000..518559ba9
--- /dev/null
+++ b/internal/gitaly/service/commit/check_objects_exist_test.go
@@ -0,0 +1,117 @@
+package commit
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gitlab.com/gitlab-org/gitaly/v14/internal/git/gittest"
+	"gitlab.com/gitlab-org/gitaly/v14/internal/testhelper"
+	"gitlab.com/gitlab-org/gitaly/v14/proto/go/gitalypb"
+	"google.golang.org/grpc/codes"
+)
+
+func TestListExistingObjects(t *testing.T) {
+	t.Parallel()
+
+	ctx := testhelper.Context(t)
+	cfg, repo, repoPath, client := setupCommitServiceWithRepo(ctx, t, true)
+
+	// write a few commitIDs we can use
+	commitID1 := gittest.WriteCommit(t, cfg, repoPath)
+	commitID2 := gittest.WriteCommit(t, cfg, repoPath)
+	commitID3 := gittest.WriteCommit(t, cfg, repoPath)
+
+	// remove a ref from the repository so we know it doesn't exist
+	gittest.Exec(t, cfg, "-C", repoPath, "update-ref", "-d", "refs/heads/many_files")
+
+	nonexistingObject := "abcdefg"
+	cmd := gittest.NewCommand(t, cfg, "-C", repoPath, "rev-parse", nonexistingObject)
+	require.Error(t, cmd.Wait(), "ensure the object doesn't exist")
+
+	testCases := []struct {
+		desc            string
+		input           [][]byte
+		expectedExists  [][]byte
+		expectedMissing [][]byte
+		returnCode      codes.Code
+	}{
+		{
+			desc: "commit ids and refs that exist",
+			input: [][]byte{
+				[]byte(commitID1),
+				[]byte("master"),
+				[]byte(commitID2),
+				[]byte(commitID3),
+				[]byte("feature"),
+			},
+			expectedExists: [][]byte{
+				[]byte(commitID1),
+				[]byte("master"),
+				[]byte(commitID2),
+				[]byte(commitID3),
+				[]byte("feature"),
+			},
+			returnCode: codes.OK,
+		},
+		{
+			desc: "ref and objects missing",
+			input: [][]byte{
+				[]byte(commitID1),
+				[]byte("master"),
+				[]byte(commitID2),
+				[]byte(commitID3),
+				[]byte("feature"),
+				[]byte("many_files"),
+				[]byte(nonexistingObject),
+			},
+			expectedExists: [][]byte{
+				[]byte(commitID1),
+				[]byte("master"),
+				[]byte(commitID2),
+				[]byte(commitID3),
+				[]byte("feature"),
+			},
+			expectedMissing: [][]byte{
+				[]byte("many_files"),
+				[]byte(nonexistingObject),
+			},
+			returnCode: codes.OK,
+		},
+		{
+			desc:       "empty input",
+			input:      [][]byte{},
+			returnCode: codes.OK,
+		},
+		{
+			desc:       "invalid input",
+			input:      [][]byte{[]byte("-not-a-rev")},
+			returnCode: codes.InvalidArgument,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			c, err := client.CheckObjectsExist(ctx)
+			require.NoError(t, err)
+
+			require.NoError(t, c.Send(
+				&gitalypb.CheckObjectsExistRequest{
+					Repository: repo,
+					Revisions:  tc.input,
+				},
+			))
+			require.NoError(t, c.CloseSend())
+
+			resp, err := c.Recv()
+			if tc.returnCode != codes.OK {
+				testhelper.RequireGrpcCode(t, err, tc.returnCode)
+			} else {
+				require.NoError(t, err)
+			}
+
+			assert.Equal(t, tc.expectedExists, resp.GetExistingRevisions())
+			assert.Equal(t, tc.expectedMissing, resp.GetMissingRevisions())
+		})
+	}
+}
diff --git a/proto/commit.proto b/proto/commit.proto
index 4c9f3fe1d..d0d320296 100644
--- a/proto/commit.proto
+++ b/proto/commit.proto
@@ -130,6 +130,16 @@ service CommitService {
       op: ACCESSOR
     };
   }
+
+  // CheckObjectsExist will check for the existence of revisions against a
+  // repository. It returns two sets of data. An array containing the revisions
+  // fromm the input that it found on the repository, and an array that contains all
+  // revisions from the input it did not find on the repository.
+  rpc CheckObjectsExist(stream CheckObjectsExistRequest) returns (stream CheckObjectsExistResponse) {
+    option (op_type) = {
+      op: ACCESSOR
+    };
+  }
 }
 
 // ListCommitsRequest is a request for the ListCommits RPC.
@@ -562,3 +572,20 @@ message GetCommitMessagesResponse {
   string commit_id = 1;
   bytes message = 2;
 }
+
+// CheckObjectsExistRequest is a request for the CheckObjectsExist RPC.
+message CheckObjectsExistRequest {
+  // Repository is the repository in which existence of objects and refs
+  // are checked.
+  Repository repository = 1 [(target_repository)=true];
+  // Revisions contains the revisions that shall be checked for existence. This accepts all revisions
+  // as documented in gitrevisions(7)
+  repeated bytes revisions = 2;
+}
+
+message CheckObjectsExistResponse {
+  // ExistingRevisions are revisions that exist in the repository
+  repeated bytes existing_revisions = 1;
+  // MissingRevisions are revisions that do not exist in the repository
+  repeated bytes missing_revisions = 2;
+}
diff --git a/proto/go/gitalypb/commit.pb.go b/proto/go/gitalypb/commit.pb.go
index 3b9eccbad..a535abca3 100644
--- a/proto/go/gitalypb/commit.pb.go
+++ b/proto/go/gitalypb/commit.pb.go
@@ -3391,6 +3391,123 @@ func (x *GetCommitMessagesResponse) GetMessage() []byte {
 	return nil
 }
 
+// CheckObjectsExistRequest is a request for the CheckObjectsExist RPC.
+type CheckObjectsExistRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Repository is the repository in which existence of objects and refs
+	// are checked.
+	Repository *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
+	// Revisions contains the revisions that shall be checked for existence. This accepts all revisions
+	// as documented in gitrevisions(7)
+	Revisions [][]byte `protobuf:"bytes,2,rep,name=revisions,proto3" json:"revisions,omitempty"`
+}
+
+func (x *CheckObjectsExistRequest) Reset() {
+	*x = CheckObjectsExistRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_commit_proto_msgTypes[47]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CheckObjectsExistRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CheckObjectsExistRequest) ProtoMessage() {}
+
+func (x *CheckObjectsExistRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_commit_proto_msgTypes[47]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CheckObjectsExistRequest.ProtoReflect.Descriptor instead.
+func (*CheckObjectsExistRequest) Descriptor() ([]byte, []int) {
+	return file_commit_proto_rawDescGZIP(), []int{47}
+}
+
+func (x *CheckObjectsExistRequest) GetRepository() *Repository {
+	if x != nil {
+		return x.Repository
+	}
+	return nil
+}
+
+func (x *CheckObjectsExistRequest) GetRevisions() [][]byte {
+	if x != nil {
+		return x.Revisions
+	}
+	return nil
+}
+
+type CheckObjectsExistResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// ExistingRevisions are revisions that exist in the repository
+	ExistingRevisions [][]byte `protobuf:"bytes,1,rep,name=existing_revisions,json=existingRevisions,proto3" json:"existing_revisions,omitempty"`
+	// MissingRevisions are revisions that do not exist in the repository
+	MissingRevisions [][]byte `protobuf:"bytes,2,rep,name=missing_revisions,json=missingRevisions,proto3" json:"missing_revisions,omitempty"`
+}
+
+func (x *CheckObjectsExistResponse) Reset() {
+	*x = CheckObjectsExistResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_commit_proto_msgTypes[48]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CheckObjectsExistResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CheckObjectsExistResponse) ProtoMessage() {}
+
+func (x *CheckObjectsExistResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_commit_proto_msgTypes[48]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CheckObjectsExistResponse.ProtoReflect.Descriptor instead.
+func (*CheckObjectsExistResponse) Descriptor() ([]byte, []int) {
+	return file_commit_proto_rawDescGZIP(), []int{48}
+}
+
+func (x *CheckObjectsExistResponse) GetExistingRevisions() [][]byte {
+	if x != nil {
+		return x.ExistingRevisions
+	}
+	return nil
+}
+
+func (x *CheckObjectsExistResponse) GetMissingRevisions() [][]byte {
+	if x != nil {
+		return x.MissingRevisions
+	}
+	return nil
+}
+
 type ListCommitsByRefNameResponse_CommitForRef struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3403,7 +3520,7 @@ type ListCommitsByRefNameResponse_CommitForRef struct {
 func (x *ListCommitsByRefNameResponse_CommitForRef) Reset() {
 	*x = ListCommitsByRefNameResponse_CommitForRef{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_commit_proto_msgTypes[47]
+		mi := &file_commit_proto_msgTypes[49]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3416,7 +3533,7 @@ func (x *ListCommitsByRefNameResponse_CommitForRef) String() string {
 func (*ListCommitsByRefNameResponse_CommitForRef) ProtoMessage() {}
 
 func (x *ListCommitsByRefNameResponse_CommitForRef) ProtoReflect() protoreflect.Message {
-	mi := &file_commit_proto_msgTypes[47]
+	mi := &file_commit_proto_msgTypes[49]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3461,7 +3578,7 @@ type CommitLanguagesResponse_Language struct {
 func (x *CommitLanguagesResponse_Language) Reset() {
 	*x = CommitLanguagesResponse_Language{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_commit_proto_msgTypes[48]
+		mi := &file_commit_proto_msgTypes[50]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3474,7 +3591,7 @@ func (x *CommitLanguagesResponse_Language) String() string {
 func (*CommitLanguagesResponse_Language) ProtoMessage() {}
 
 func (x *CommitLanguagesResponse_Language) ProtoReflect() protoreflect.Message {
-	mi := &file_commit_proto_msgTypes[48]
+	mi := &file_commit_proto_msgTypes[50]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3537,7 +3654,7 @@ type ListLastCommitsForTreeResponse_CommitForTree struct {
 func (x *ListLastCommitsForTreeResponse_CommitForTree) Reset() {
 	*x = ListLastCommitsForTreeResponse_CommitForTree{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_commit_proto_msgTypes[49]
+		mi := &file_commit_proto_msgTypes[51]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3550,7 +3667,7 @@ func (x *ListLastCommitsForTreeResponse_CommitForTree) String() string {
 func (*ListLastCommitsForTreeResponse_CommitForTree) ProtoMessage() {}
 
 func (x *ListLastCommitsForTreeResponse_CommitForTree) ProtoReflect() protoreflect.Message {
-	mi := &file_commit_proto_msgTypes[49]
+	mi := &file_commit_proto_msgTypes[51]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -4051,140 +4168,161 @@ var file_commit_proto_rawDesc = []byte{
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+	0x6c, 0x79, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -4200,7 +4338,7 @@ func file_commit_proto_rawDescGZIP() []byte {
 }
 
 var file_commit_proto_enumTypes = make([]protoimpl.EnumInfo, 6)
-var file_commit_proto_msgTypes = make([]protoimpl.MessageInfo, 50)
+var file_commit_proto_msgTypes = make([]protoimpl.MessageInfo, 52)
 var file_commit_proto_goTypes = []interface{}{
 	(ListCommitsRequest_Order)(0),                        // 0: gitaly.ListCommitsRequest.Order
 	(TreeEntryResponse_ObjectType)(0),                    // 1: gitaly.TreeEntryResponse.ObjectType
@@ -4255,124 +4393,129 @@ var file_commit_proto_goTypes = []interface{}{
 	(*GetCommitSignaturesResponse)(nil),                  // 50: gitaly.GetCommitSignaturesResponse
 	(*GetCommitMessagesRequest)(nil),                     // 51: gitaly.GetCommitMessagesRequest
 	(*GetCommitMessagesResponse)(nil),                    // 52: gitaly.GetCommitMessagesResponse
-	(*ListCommitsByRefNameResponse_CommitForRef)(nil),    // 53: gitaly.ListCommitsByRefNameResponse.CommitForRef
-	(*CommitLanguagesResponse_Language)(nil),             // 54: gitaly.CommitLanguagesResponse.Language
-	(*ListLastCommitsForTreeResponse_CommitForTree)(nil), // 55: gitaly.ListLastCommitsForTreeResponse.CommitForTree
-	(*Repository)(nil),                                   // 56: gitaly.Repository
-	(*PaginationParameter)(nil),                          // 57: gitaly.PaginationParameter
-	(*timestamppb.Timestamp)(nil),                        // 58: google.protobuf.Timestamp
-	(*GitCommit)(nil),                                    // 59: gitaly.GitCommit
-	(*GlobalOptions)(nil),                                // 60: gitaly.GlobalOptions
-	(*PaginationCursor)(nil),                             // 61: gitaly.PaginationCursor
+	(*CheckObjectsExistRequest)(nil),                     // 53: gitaly.CheckObjectsExistRequest
+	(*CheckObjectsExistResponse)(nil),                    // 54: gitaly.CheckObjectsExistResponse
+	(*ListCommitsByRefNameResponse_CommitForRef)(nil),    // 55: gitaly.ListCommitsByRefNameResponse.CommitForRef
+	(*CommitLanguagesResponse_Language)(nil),             // 56: gitaly.CommitLanguagesResponse.Language
+	(*ListLastCommitsForTreeResponse_CommitForTree)(nil), // 57: gitaly.ListLastCommitsForTreeResponse.CommitForTree
+	(*Repository)(nil),                                   // 58: gitaly.Repository
+	(*PaginationParameter)(nil),                          // 59: gitaly.PaginationParameter
+	(*timestamppb.Timestamp)(nil),                        // 60: google.protobuf.Timestamp
+	(*GitCommit)(nil),                                    // 61: gitaly.GitCommit
+	(*GlobalOptions)(nil),                                // 62: gitaly.GlobalOptions
+	(*PaginationCursor)(nil),                             // 63: gitaly.PaginationCursor
 }
 var file_commit_proto_depIdxs = []int32{
-	56, // 0: gitaly.ListCommitsRequest.repository:type_name -> gitaly.Repository
-	57, // 1: gitaly.ListCommitsRequest.pagination_params:type_name -> gitaly.PaginationParameter
+	58, // 0: gitaly.ListCommitsRequest.repository:type_name -> gitaly.Repository
+	59, // 1: gitaly.ListCommitsRequest.pagination_params:type_name -> gitaly.PaginationParameter
 	0,  // 2: gitaly.ListCommitsRequest.order:type_name -> gitaly.ListCommitsRequest.Order
-	58, // 3: gitaly.ListCommitsRequest.after:type_name -> google.protobuf.Timestamp
-	58, // 4: gitaly.ListCommitsRequest.before:type_name -> google.protobuf.Timestamp
-	59, // 5: gitaly.ListCommitsResponse.commits:type_name -> gitaly.GitCommit
-	56, // 6: gitaly.ListAllCommitsRequest.repository:type_name -> gitaly.Repository
-	57, // 7: gitaly.ListAllCommitsRequest.pagination_params:type_name -> gitaly.PaginationParameter
-	59, // 8: gitaly.ListAllCommitsResponse.commits:type_name -> gitaly.GitCommit
-	56, // 9: gitaly.CommitStatsRequest.repository:type_name -> gitaly.Repository
-	56, // 10: gitaly.CommitIsAncestorRequest.repository:type_name -> gitaly.Repository
-	56, // 11: gitaly.TreeEntryRequest.repository:type_name -> gitaly.Repository
+	60, // 3: gitaly.ListCommitsRequest.after:type_name -> google.protobuf.Timestamp
+	60, // 4: gitaly.ListCommitsRequest.before:type_name -> google.protobuf.Timestamp
+	61, // 5: gitaly.ListCommitsResponse.commits:type_name -> gitaly.GitCommit
+	58, // 6: gitaly.ListAllCommitsRequest.repository:type_name -> gitaly.Repository
+	59, // 7: gitaly.ListAllCommitsRequest.pagination_params:type_name -> gitaly.PaginationParameter
+	61, // 8: gitaly.ListAllCommitsResponse.commits:type_name -> gitaly.GitCommit
+	58, // 9: gitaly.CommitStatsRequest.repository:type_name -> gitaly.Repository
+	58, // 10: gitaly.CommitIsAncestorRequest.repository:type_name -> gitaly.Repository
+	58, // 11: gitaly.TreeEntryRequest.repository:type_name -> gitaly.Repository
 	1,  // 12: gitaly.TreeEntryResponse.type:type_name -> gitaly.TreeEntryResponse.ObjectType
-	56, // 13: gitaly.CountCommitsRequest.repository:type_name -> gitaly.Repository
-	58, // 14: gitaly.CountCommitsRequest.after:type_name -> google.protobuf.Timestamp
-	58, // 15: gitaly.CountCommitsRequest.before:type_name -> google.protobuf.Timestamp
-	60, // 16: gitaly.CountCommitsRequest.global_options:type_name -> gitaly.GlobalOptions
-	56, // 17: gitaly.CountDivergingCommitsRequest.repository:type_name -> gitaly.Repository
+	58, // 13: gitaly.CountCommitsRequest.repository:type_name -> gitaly.Repository
+	60, // 14: gitaly.CountCommitsRequest.after:type_name -> google.protobuf.Timestamp
+	60, // 15: gitaly.CountCommitsRequest.before:type_name -> google.protobuf.Timestamp
+	62, // 16: gitaly.CountCommitsRequest.global_options:type_name -> gitaly.GlobalOptions
+	58, // 17: gitaly.CountDivergingCommitsRequest.repository:type_name -> gitaly.Repository
 	2,  // 18: gitaly.TreeEntry.type:type_name -> gitaly.TreeEntry.EntryType
-	56, // 19: gitaly.GetTreeEntriesRequest.repository:type_name -> gitaly.Repository
+	58, // 19: gitaly.GetTreeEntriesRequest.repository:type_name -> gitaly.Repository
 	3,  // 20: gitaly.GetTreeEntriesRequest.sort:type_name -> gitaly.GetTreeEntriesRequest.SortBy
-	57, // 21: gitaly.GetTreeEntriesRequest.pagination_params:type_name -> gitaly.PaginationParameter
+	59, // 21: gitaly.GetTreeEntriesRequest.pagination_params:type_name -> gitaly.PaginationParameter
 	20, // 22: gitaly.GetTreeEntriesResponse.entries:type_name -> gitaly.TreeEntry
-	61, // 23: gitaly.GetTreeEntriesResponse.pagination_cursor:type_name -> gitaly.PaginationCursor
-	56, // 24: gitaly.ListFilesRequest.repository:type_name -> gitaly.Repository
-	56, // 25: gitaly.FindCommitRequest.repository:type_name -> gitaly.Repository
-	59, // 26: gitaly.FindCommitResponse.commit:type_name -> gitaly.GitCommit
-	56, // 27: gitaly.ListCommitsByOidRequest.repository:type_name -> gitaly.Repository
-	59, // 28: gitaly.ListCommitsByOidResponse.commits:type_name -> gitaly.GitCommit
-	56, // 29: gitaly.ListCommitsByRefNameRequest.repository:type_name -> gitaly.Repository
-	53, // 30: gitaly.ListCommitsByRefNameResponse.commit_refs:type_name -> gitaly.ListCommitsByRefNameResponse.CommitForRef
-	56, // 31: gitaly.FindAllCommitsRequest.repository:type_name -> gitaly.Repository
+	63, // 23: gitaly.GetTreeEntriesResponse.pagination_cursor:type_name -> gitaly.PaginationCursor
+	58, // 24: gitaly.ListFilesRequest.repository:type_name -> gitaly.Repository
+	58, // 25: gitaly.FindCommitRequest.repository:type_name -> gitaly.Repository
+	61, // 26: gitaly.FindCommitResponse.commit:type_name -> gitaly.GitCommit
+	58, // 27: gitaly.ListCommitsByOidRequest.repository:type_name -> gitaly.Repository
+	61, // 28: gitaly.ListCommitsByOidResponse.commits:type_name -> gitaly.GitCommit
+	58, // 29: gitaly.ListCommitsByRefNameRequest.repository:type_name -> gitaly.Repository
+	55, // 30: gitaly.ListCommitsByRefNameResponse.commit_refs:type_name -> gitaly.ListCommitsByRefNameResponse.CommitForRef
+	58, // 31: gitaly.FindAllCommitsRequest.repository:type_name -> gitaly.Repository
 	4,  // 32: gitaly.FindAllCommitsRequest.order:type_name -> gitaly.FindAllCommitsRequest.Order
-	59, // 33: gitaly.FindAllCommitsResponse.commits:type_name -> gitaly.GitCommit
-	56, // 34: gitaly.FindCommitsRequest.repository:type_name -> gitaly.Repository
-	58, // 35: gitaly.FindCommitsRequest.after:type_name -> google.protobuf.Timestamp
-	58, // 36: gitaly.FindCommitsRequest.before:type_name -> google.protobuf.Timestamp
+	61, // 33: gitaly.FindAllCommitsResponse.commits:type_name -> gitaly.GitCommit
+	58, // 34: gitaly.FindCommitsRequest.repository:type_name -> gitaly.Repository
+	60, // 35: gitaly.FindCommitsRequest.after:type_name -> google.protobuf.Timestamp
+	60, // 36: gitaly.FindCommitsRequest.before:type_name -> google.protobuf.Timestamp
 	5,  // 37: gitaly.FindCommitsRequest.order:type_name -> gitaly.FindCommitsRequest.Order
-	60, // 38: gitaly.FindCommitsRequest.global_options:type_name -> gitaly.GlobalOptions
-	59, // 39: gitaly.FindCommitsResponse.commits:type_name -> gitaly.GitCommit
-	56, // 40: gitaly.CommitLanguagesRequest.repository:type_name -> gitaly.Repository
-	54, // 41: gitaly.CommitLanguagesResponse.languages:type_name -> gitaly.CommitLanguagesResponse.Language
-	56, // 42: gitaly.RawBlameRequest.repository:type_name -> gitaly.Repository
-	56, // 43: gitaly.LastCommitForPathRequest.repository:type_name -> gitaly.Repository
-	60, // 44: gitaly.LastCommitForPathRequest.global_options:type_name -> gitaly.GlobalOptions
-	59, // 45: gitaly.LastCommitForPathResponse.commit:type_name -> gitaly.GitCommit
-	56, // 46: gitaly.ListLastCommitsForTreeRequest.repository:type_name -> gitaly.Repository
-	60, // 47: gitaly.ListLastCommitsForTreeRequest.global_options:type_name -> gitaly.GlobalOptions
-	55, // 48: gitaly.ListLastCommitsForTreeResponse.commits:type_name -> gitaly.ListLastCommitsForTreeResponse.CommitForTree
-	56, // 49: gitaly.CommitsByMessageRequest.repository:type_name -> gitaly.Repository
-	60, // 50: gitaly.CommitsByMessageRequest.global_options:type_name -> gitaly.GlobalOptions
-	59, // 51: gitaly.CommitsByMessageResponse.commits:type_name -> gitaly.GitCommit
-	56, // 52: gitaly.FilterShasWithSignaturesRequest.repository:type_name -> gitaly.Repository
-	56, // 53: gitaly.ExtractCommitSignatureRequest.repository:type_name -> gitaly.Repository
-	56, // 54: gitaly.GetCommitSignaturesRequest.repository:type_name -> gitaly.Repository
-	56, // 55: gitaly.GetCommitMessagesRequest.repository:type_name -> gitaly.Repository
-	59, // 56: gitaly.ListCommitsByRefNameResponse.CommitForRef.commit:type_name -> gitaly.GitCommit
-	59, // 57: gitaly.ListLastCommitsForTreeResponse.CommitForTree.commit:type_name -> gitaly.GitCommit
-	6,  // 58: gitaly.CommitService.ListCommits:input_type -> gitaly.ListCommitsRequest
-	8,  // 59: gitaly.CommitService.ListAllCommits:input_type -> gitaly.ListAllCommitsRequest
-	12, // 60: gitaly.CommitService.CommitIsAncestor:input_type -> gitaly.CommitIsAncestorRequest
-	14, // 61: gitaly.CommitService.TreeEntry:input_type -> gitaly.TreeEntryRequest
-	16, // 62: gitaly.CommitService.CountCommits:input_type -> gitaly.CountCommitsRequest
-	18, // 63: gitaly.CommitService.CountDivergingCommits:input_type -> gitaly.CountDivergingCommitsRequest
-	21, // 64: gitaly.CommitService.GetTreeEntries:input_type -> gitaly.GetTreeEntriesRequest
-	23, // 65: gitaly.CommitService.ListFiles:input_type -> gitaly.ListFilesRequest
-	25, // 66: gitaly.CommitService.FindCommit:input_type -> gitaly.FindCommitRequest
-	10, // 67: gitaly.CommitService.CommitStats:input_type -> gitaly.CommitStatsRequest
-	31, // 68: gitaly.CommitService.FindAllCommits:input_type -> gitaly.FindAllCommitsRequest
-	33, // 69: gitaly.CommitService.FindCommits:input_type -> gitaly.FindCommitsRequest
-	35, // 70: gitaly.CommitService.CommitLanguages:input_type -> gitaly.CommitLanguagesRequest
-	37, // 71: gitaly.CommitService.RawBlame:input_type -> gitaly.RawBlameRequest
-	39, // 72: gitaly.CommitService.LastCommitForPath:input_type -> gitaly.LastCommitForPathRequest
-	41, // 73: gitaly.CommitService.ListLastCommitsForTree:input_type -> gitaly.ListLastCommitsForTreeRequest
-	43, // 74: gitaly.CommitService.CommitsByMessage:input_type -> gitaly.CommitsByMessageRequest
-	27, // 75: gitaly.CommitService.ListCommitsByOid:input_type -> gitaly.ListCommitsByOidRequest
-	29, // 76: gitaly.CommitService.ListCommitsByRefName:input_type -> gitaly.ListCommitsByRefNameRequest
-	45, // 77: gitaly.CommitService.FilterShasWithSignatures:input_type -> gitaly.FilterShasWithSignaturesRequest
-	49, // 78: gitaly.CommitService.GetCommitSignatures:input_type -> gitaly.GetCommitSignaturesRequest
-	51, // 79: gitaly.CommitService.GetCommitMessages:input_type -> gitaly.GetCommitMessagesRequest
-	7,  // 80: gitaly.CommitService.ListCommits:output_type -> gitaly.ListCommitsResponse
-	9,  // 81: gitaly.CommitService.ListAllCommits:output_type -> gitaly.ListAllCommitsResponse
-	13, // 82: gitaly.CommitService.CommitIsAncestor:output_type -> gitaly.CommitIsAncestorResponse
-	15, // 83: gitaly.CommitService.TreeEntry:output_type -> gitaly.TreeEntryResponse
-	17, // 84: gitaly.CommitService.CountCommits:output_type -> gitaly.CountCommitsResponse
-	19, // 85: gitaly.CommitService.CountDivergingCommits:output_type -> gitaly.CountDivergingCommitsResponse
-	22, // 86: gitaly.CommitService.GetTreeEntries:output_type -> gitaly.GetTreeEntriesResponse
-	24, // 87: gitaly.CommitService.ListFiles:output_type -> gitaly.ListFilesResponse
-	26, // 88: gitaly.CommitService.FindCommit:output_type -> gitaly.FindCommitResponse
-	11, // 89: gitaly.CommitService.CommitStats:output_type -> gitaly.CommitStatsResponse
-	32, // 90: gitaly.CommitService.FindAllCommits:output_type -> gitaly.FindAllCommitsResponse
-	34, // 91: gitaly.CommitService.FindCommits:output_type -> gitaly.FindCommitsResponse
-	36, // 92: gitaly.CommitService.CommitLanguages:output_type -> gitaly.CommitLanguagesResponse
-	38, // 93: gitaly.CommitService.RawBlame:output_type -> gitaly.RawBlameResponse
-	40, // 94: gitaly.CommitService.LastCommitForPath:output_type -> gitaly.LastCommitForPathResponse
-	42, // 95: gitaly.CommitService.ListLastCommitsForTree:output_type -> gitaly.ListLastCommitsForTreeResponse
-	44, // 96: gitaly.CommitService.CommitsByMessage:output_type -> gitaly.CommitsByMessageResponse
-	28, // 97: gitaly.CommitService.ListCommitsByOid:output_type -> gitaly.ListCommitsByOidResponse
-	30, // 98: gitaly.CommitService.ListCommitsByRefName:output_type -> gitaly.ListCommitsByRefNameResponse
-	46, // 99: gitaly.CommitService.FilterShasWithSignatures:output_type -> gitaly.FilterShasWithSignaturesResponse
-	50, // 100: gitaly.CommitService.GetCommitSignatures:output_type -> gitaly.GetCommitSignaturesResponse
-	52, // 101: gitaly.CommitService.GetCommitMessages:output_type -> gitaly.GetCommitMessagesResponse
-	80, // [80:102] is the sub-list for method output_type
-	58, // [58:80] is the sub-list for method input_type
-	58, // [58:58] is the sub-list for extension type_name
-	58, // [58:58] is the sub-list for extension extendee
-	0,  // [0:58] is the sub-list for field type_name
+	62, // 38: gitaly.FindCommitsRequest.global_options:type_name -> gitaly.GlobalOptions
+	61, // 39: gitaly.FindCommitsResponse.commits:type_name -> gitaly.GitCommit
+	58, // 40: gitaly.CommitLanguagesRequest.repository:type_name -> gitaly.Repository
+	56, // 41: gitaly.CommitLanguagesResponse.languages:type_name -> gitaly.CommitLanguagesResponse.Language
+	58, // 42: gitaly.RawBlameRequest.repository:type_name -> gitaly.Repository
+	58, // 43: gitaly.LastCommitForPathRequest.repository:type_name -> gitaly.Repository
+	62, // 44: gitaly.LastCommitForPathRequest.global_options:type_name -> gitaly.GlobalOptions
+	61, // 45: gitaly.LastCommitForPathResponse.commit:type_name -> gitaly.GitCommit
+	58, // 46: gitaly.ListLastCommitsForTreeRequest.repository:type_name -> gitaly.Repository
+	62, // 47: gitaly.ListLastCommitsForTreeRequest.global_options:type_name -> gitaly.GlobalOptions
+	57, // 48: gitaly.ListLastCommitsForTreeResponse.commits:type_name -> gitaly.ListLastCommitsForTreeResponse.CommitForTree
+	58, // 49: gitaly.CommitsByMessageRequest.repository:type_name -> gitaly.Repository
+	62, // 50: gitaly.CommitsByMessageRequest.global_options:type_name -> gitaly.GlobalOptions
+	61, // 51: gitaly.CommitsByMessageResponse.commits:type_name -> gitaly.GitCommit
+	58, // 52: gitaly.FilterShasWithSignaturesRequest.repository:type_name -> gitaly.Repository
+	58, // 53: gitaly.ExtractCommitSignatureRequest.repository:type_name -> gitaly.Repository
+	58, // 54: gitaly.GetCommitSignaturesRequest.repository:type_name -> gitaly.Repository
+	58, // 55: gitaly.GetCommitMessagesRequest.repository:type_name -> gitaly.Repository
+	58, // 56: gitaly.CheckObjectsExistRequest.repository:type_name -> gitaly.Repository
+	61, // 57: gitaly.ListCommitsByRefNameResponse.CommitForRef.commit:type_name -> gitaly.GitCommit
+	61, // 58: gitaly.ListLastCommitsForTreeResponse.CommitForTree.commit:type_name -> gitaly.GitCommit
+	6,  // 59: gitaly.CommitService.ListCommits:input_type -> gitaly.ListCommitsRequest
+	8,  // 60: gitaly.CommitService.ListAllCommits:input_type -> gitaly.ListAllCommitsRequest
+	12, // 61: gitaly.CommitService.CommitIsAncestor:input_type -> gitaly.CommitIsAncestorRequest
+	14, // 62: gitaly.CommitService.TreeEntry:input_type -> gitaly.TreeEntryRequest
+	16, // 63: gitaly.CommitService.CountCommits:input_type -> gitaly.CountCommitsRequest
+	18, // 64: gitaly.CommitService.CountDivergingCommits:input_type -> gitaly.CountDivergingCommitsRequest
+	21, // 65: gitaly.CommitService.GetTreeEntries:input_type -> gitaly.GetTreeEntriesRequest
+	23, // 66: gitaly.CommitService.ListFiles:input_type -> gitaly.ListFilesRequest
+	25, // 67: gitaly.CommitService.FindCommit:input_type -> gitaly.FindCommitRequest
+	10, // 68: gitaly.CommitService.CommitStats:input_type -> gitaly.CommitStatsRequest
+	31, // 69: gitaly.CommitService.FindAllCommits:input_type -> gitaly.FindAllCommitsRequest
+	33, // 70: gitaly.CommitService.FindCommits:input_type -> gitaly.FindCommitsRequest
+	35, // 71: gitaly.CommitService.CommitLanguages:input_type -> gitaly.CommitLanguagesRequest
+	37, // 72: gitaly.CommitService.RawBlame:input_type -> gitaly.RawBlameRequest
+	39, // 73: gitaly.CommitService.LastCommitForPath:input_type -> gitaly.LastCommitForPathRequest
+	41, // 74: gitaly.CommitService.ListLastCommitsForTree:input_type -> gitaly.ListLastCommitsForTreeRequest
+	43, // 75: gitaly.CommitService.CommitsByMessage:input_type -> gitaly.CommitsByMessageRequest
+	27, // 76: gitaly.CommitService.ListCommitsByOid:input_type -> gitaly.ListCommitsByOidRequest
+	29, // 77: gitaly.CommitService.ListCommitsByRefName:input_type -> gitaly.ListCommitsByRefNameRequest
+	45, // 78: gitaly.CommitService.FilterShasWithSignatures:input_type -> gitaly.FilterShasWithSignaturesRequest
+	49, // 79: gitaly.CommitService.GetCommitSignatures:input_type -> gitaly.GetCommitSignaturesRequest
+	51, // 80: gitaly.CommitService.GetCommitMessages:input_type -> gitaly.GetCommitMessagesRequest
+	53, // 81: gitaly.CommitService.CheckObjectsExist:input_type -> gitaly.CheckObjectsExistRequest
+	7,  // 82: gitaly.CommitService.ListCommits:output_type -> gitaly.ListCommitsResponse
+	9,  // 83: gitaly.CommitService.ListAllCommits:output_type -> gitaly.ListAllCommitsResponse
+	13, // 84: gitaly.CommitService.CommitIsAncestor:output_type -> gitaly.CommitIsAncestorResponse
+	15, // 85: gitaly.CommitService.TreeEntry:output_type -> gitaly.TreeEntryResponse
+	17, // 86: gitaly.CommitService.CountCommits:output_type -> gitaly.CountCommitsResponse
+	19, // 87: gitaly.CommitService.CountDivergingCommits:output_type -> gitaly.CountDivergingCommitsResponse
+	22, // 88: gitaly.CommitService.GetTreeEntries:output_type -> gitaly.GetTreeEntriesResponse
+	24, // 89: gitaly.CommitService.ListFiles:output_type -> gitaly.ListFilesResponse
+	26, // 90: gitaly.CommitService.FindCommit:output_type -> gitaly.FindCommitResponse
+	11, // 91: gitaly.CommitService.CommitStats:output_type -> gitaly.CommitStatsResponse
+	32, // 92: gitaly.CommitService.FindAllCommits:output_type -> gitaly.FindAllCommitsResponse
+	34, // 93: gitaly.CommitService.FindCommits:output_type -> gitaly.FindCommitsResponse
+	36, // 94: gitaly.CommitService.CommitLanguages:output_type -> gitaly.CommitLanguagesResponse
+	38, // 95: gitaly.CommitService.RawBlame:output_type -> gitaly.RawBlameResponse
+	40, // 96: gitaly.CommitService.LastCommitForPath:output_type -> gitaly.LastCommitForPathResponse
+	42, // 97: gitaly.CommitService.ListLastCommitsForTree:output_type -> gitaly.ListLastCommitsForTreeResponse
+	44, // 98: gitaly.CommitService.CommitsByMessage:output_type -> gitaly.CommitsByMessageResponse
+	28, // 99: gitaly.CommitService.ListCommitsByOid:output_type -> gitaly.ListCommitsByOidResponse
+	30, // 100: gitaly.CommitService.ListCommitsByRefName:output_type -> gitaly.ListCommitsByRefNameResponse
+	46, // 101: gitaly.CommitService.FilterShasWithSignatures:output_type -> gitaly.FilterShasWithSignaturesResponse
+	50, // 102: gitaly.CommitService.GetCommitSignatures:output_type -> gitaly.GetCommitSignaturesResponse
+	52, // 103: gitaly.CommitService.GetCommitMessages:output_type -> gitaly.GetCommitMessagesResponse
+	54, // 104: gitaly.CommitService.CheckObjectsExist:output_type -> gitaly.CheckObjectsExistResponse
+	82, // [82:105] is the sub-list for method output_type
+	59, // [59:82] is the sub-list for method input_type
+	59, // [59:59] is the sub-list for extension type_name
+	59, // [59:59] is the sub-list for extension extendee
+	0,  // [0:59] is the sub-list for field type_name
 }
 
 func init() { file_commit_proto_init() }
@@ -4948,7 +5091,7 @@ func file_commit_proto_init() {
 			}
 		}
 		file_commit_proto_msgTypes[47].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ListCommitsByRefNameResponse_CommitForRef); i {
+			switch v := v.(*CheckObjectsExistRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4960,7 +5103,7 @@ func file_commit_proto_init() {
 			}
 		}
 		file_commit_proto_msgTypes[48].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CommitLanguagesResponse_Language); i {
+			switch v := v.(*CheckObjectsExistResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4972,6 +5115,30 @@ func file_commit_proto_init() {
 			}
 		}
 		file_commit_proto_msgTypes[49].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ListCommitsByRefNameResponse_CommitForRef); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_commit_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CommitLanguagesResponse_Language); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_commit_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ListLastCommitsForTreeResponse_CommitForTree); i {
 			case 0:
 				return &v.state
@@ -4990,7 +5157,7 @@ func file_commit_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_commit_proto_rawDesc,
 			NumEnums:      6,
-			NumMessages:   50,
+			NumMessages:   52,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/proto/go/gitalypb/commit_grpc.pb.go b/proto/go/gitalypb/commit_grpc.pb.go
index 172f63975..0e1f603bd 100644
--- a/proto/go/gitalypb/commit_grpc.pb.go
+++ b/proto/go/gitalypb/commit_grpc.pb.go
@@ -46,6 +46,11 @@ type CommitServiceClient interface {
 	FilterShasWithSignatures(ctx context.Context, opts ...grpc.CallOption) (CommitService_FilterShasWithSignaturesClient, error)
 	GetCommitSignatures(ctx context.Context, in *GetCommitSignaturesRequest, opts ...grpc.CallOption) (CommitService_GetCommitSignaturesClient, error)
 	GetCommitMessages(ctx context.Context, in *GetCommitMessagesRequest, opts ...grpc.CallOption) (CommitService_GetCommitMessagesClient, error)
+	// CheckObjectsExist will check for the existence of revisions against a
+	// repository. It returns two sets of data. An array containing the revisions
+	// fromm the input that it found on the repository, and an array that contains all
+	// revisions from the input it did not find on the repository.
+	CheckObjectsExist(ctx context.Context, opts ...grpc.CallOption) (CommitService_CheckObjectsExistClient, error)
 }
 
 type commitServiceClient struct {
@@ -598,6 +603,37 @@ func (x *commitServiceGetCommitMessagesClient) Recv() (*GetCommitMessagesRespons
 	return m, nil
 }
 
+func (c *commitServiceClient) CheckObjectsExist(ctx context.Context, opts ...grpc.CallOption) (CommitService_CheckObjectsExistClient, error) {
+	stream, err := c.cc.NewStream(ctx, &CommitService_ServiceDesc.Streams[15], "/gitaly.CommitService/CheckObjectsExist", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &commitServiceCheckObjectsExistClient{stream}
+	return x, nil
+}
+
+type CommitService_CheckObjectsExistClient interface {
+	Send(*CheckObjectsExistRequest) error
+	Recv() (*CheckObjectsExistResponse, error)
+	grpc.ClientStream
+}
+
+type commitServiceCheckObjectsExistClient struct {
+	grpc.ClientStream
+}
+
+func (x *commitServiceCheckObjectsExistClient) Send(m *CheckObjectsExistRequest) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *commitServiceCheckObjectsExistClient) Recv() (*CheckObjectsExistResponse, error) {
+	m := new(CheckObjectsExistResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
 // CommitServiceServer is the server API for CommitService service.
 // All implementations must embed UnimplementedCommitServiceServer
 // for forward compatibility
@@ -630,6 +666,11 @@ type CommitServiceServer interface {
 	FilterShasWithSignatures(CommitService_FilterShasWithSignaturesServer) error
 	GetCommitSignatures(*GetCommitSignaturesRequest, CommitService_GetCommitSignaturesServer) error
 	GetCommitMessages(*GetCommitMessagesRequest, CommitService_GetCommitMessagesServer) error
+	// CheckObjectsExist will check for the existence of revisions against a
+	// repository. It returns two sets of data. An array containing the revisions
+	// fromm the input that it found on the repository, and an array that contains all
+	// revisions from the input it did not find on the repository.
+	CheckObjectsExist(CommitService_CheckObjectsExistServer) error
 	mustEmbedUnimplementedCommitServiceServer()
 }
 
@@ -703,6 +744,9 @@ func (UnimplementedCommitServiceServer) GetCommitSignatures(*GetCommitSignatures
 func (UnimplementedCommitServiceServer) GetCommitMessages(*GetCommitMessagesRequest, CommitService_GetCommitMessagesServer) error {
 	return status.Errorf(codes.Unimplemented, "method GetCommitMessages not implemented")
 }
+func (UnimplementedCommitServiceServer) CheckObjectsExist(CommitService_CheckObjectsExistServer) error {
+	return status.Errorf(codes.Unimplemented, "method CheckObjectsExist not implemented")
+}
 func (UnimplementedCommitServiceServer) mustEmbedUnimplementedCommitServiceServer() {}
 
 // UnsafeCommitServiceServer may be embedded to opt out of forward compatibility for this service.
@@ -1162,6 +1206,32 @@ func (x *commitServiceGetCommitMessagesServer) Send(m *GetCommitMessagesResponse
 	return x.ServerStream.SendMsg(m)
 }
 
+func _CommitService_CheckObjectsExist_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(CommitServiceServer).CheckObjectsExist(&commitServiceCheckObjectsExistServer{stream})
+}
+
+type CommitService_CheckObjectsExistServer interface {
+	Send(*CheckObjectsExistResponse) error
+	Recv() (*CheckObjectsExistRequest, error)
+	grpc.ServerStream
+}
+
+type commitServiceCheckObjectsExistServer struct {
+	grpc.ServerStream
+}
+
+func (x *commitServiceCheckObjectsExistServer) Send(m *CheckObjectsExistResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *commitServiceCheckObjectsExistServer) Recv() (*CheckObjectsExistRequest, error) {
+	m := new(CheckObjectsExistRequest)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
 // CommitService_ServiceDesc is the grpc.ServiceDesc for CommitService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -1275,6 +1345,12 @@ var CommitService_ServiceDesc = grpc.ServiceDesc{
 			Handler:       _CommitService_GetCommitMessages_Handler,
 			ServerStreams: true,
 		},
+		{
+			StreamName:    "CheckObjectsExist",
+			Handler:       _CommitService_CheckObjectsExist_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
 	},
 	Metadata: "commit.proto",
 }
diff --git a/ruby/proto/gitaly/commit_pb.rb b/ruby/proto/gitaly/commit_pb.rb
index 6af502fed..f64e95001 100644
--- a/ruby/proto/gitaly/commit_pb.rb
+++ b/ruby/proto/gitaly/commit_pb.rb
@@ -292,6 +292,14 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
       optional :commit_id, :string, 1
       optional :message, :bytes, 2
     end
+    add_message "gitaly.CheckObjectsExistRequest" do
+      optional :repository, :message, 1, "gitaly.Repository"
+      repeated :revisions, :bytes, 2
+    end
+    add_message "gitaly.CheckObjectsExistResponse" do
+      repeated :existing_revisions, :bytes, 1
+      repeated :missing_revisions, :bytes, 2
+    end
   end
 end
 
@@ -352,4 +360,6 @@ module Gitaly
   GetCommitSignaturesResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.GetCommitSignaturesResponse").msgclass
   GetCommitMessagesRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.GetCommitMessagesRequest").msgclass
   GetCommitMessagesResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.GetCommitMessagesResponse").msgclass
+  CheckObjectsExistRequest = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.CheckObjectsExistRequest").msgclass
+  CheckObjectsExistResponse = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("gitaly.CheckObjectsExistResponse").msgclass
 end
diff --git a/ruby/proto/gitaly/commit_services_pb.rb b/ruby/proto/gitaly/commit_services_pb.rb
index 4d5f88641..131f84122 100644
--- a/ruby/proto/gitaly/commit_services_pb.rb
+++ b/ruby/proto/gitaly/commit_services_pb.rb
@@ -42,6 +42,11 @@ module Gitaly
       rpc :FilterShasWithSignatures, stream(::Gitaly::FilterShasWithSignaturesRequest), stream(::Gitaly::FilterShasWithSignaturesResponse)
       rpc :GetCommitSignatures, ::Gitaly::GetCommitSignaturesRequest, stream(::Gitaly::GetCommitSignaturesResponse)
       rpc :GetCommitMessages, ::Gitaly::GetCommitMessagesRequest, stream(::Gitaly::GetCommitMessagesResponse)
+      # CheckObjectsExist will check for the existence of revisions against a
+      # repository. It returns two sets of data. An array containing the revisions
+      # fromm the input that it found on the repository, and an array that contains all
+      # revisions from the input it did not find on the repository.
+      rpc :CheckObjectsExist, stream(::Gitaly::CheckObjectsExistRequest), stream(::Gitaly::CheckObjectsExistResponse)
     end
 
     Stub = Service.rpc_stub_class