commit: Add CheckObjectsExist RPC

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

2 files changed, 555 insertions, 249 deletions

diff --git a/proto/go/gitalypb/commit.pb.go b/proto/go/gitalypb/commit.pb.go
index 757137bea..4dd23e043 100644
--- a/proto/go/gitalypb/commit.pb.go
+++ b/proto/go/gitalypb/commit.pb.go
@@ -3401,6 +3401,113 @@ 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
+
+	Revisions []*CheckObjectsExistResponse_RevisionExistence `protobuf:"bytes,1,rep,name=revisions,proto3" json:"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) GetRevisions() []*CheckObjectsExistResponse_RevisionExistence {
+	if x != nil {
+		return x.Revisions
+	}
+	return nil
+}
+
 type ListCommitsByRefNameResponse_CommitForRef struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3413,7 +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)
 	}
@@ -3426,7 +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 {
@@ -3471,7 +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)
 	}
@@ -3484,7 +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 {
@@ -3547,7 +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)
 	}
@@ -3560,7 +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 {
@@ -3590,6 +3697,61 @@ func (x *ListLastCommitsForTreeResponse_CommitForTree) GetPathBytes() []byte {
 	return nil
 }
 
+type CheckObjectsExistResponse_RevisionExistence struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name   []byte `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Exists bool   `protobuf:"varint,2,opt,name=exists,proto3" json:"exists,omitempty"`
+}
+
+func (x *CheckObjectsExistResponse_RevisionExistence) Reset() {
+	*x = CheckObjectsExistResponse_RevisionExistence{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_commit_proto_msgTypes[52]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CheckObjectsExistResponse_RevisionExistence) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CheckObjectsExistResponse_RevisionExistence) ProtoMessage() {}
+
+func (x *CheckObjectsExistResponse_RevisionExistence) ProtoReflect() protoreflect.Message {
+	mi := &file_commit_proto_msgTypes[52]
+	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_RevisionExistence.ProtoReflect.Descriptor instead.
+func (*CheckObjectsExistResponse_RevisionExistence) Descriptor() ([]byte, []int) {
+	return file_commit_proto_rawDescGZIP(), []int{48, 0}
+}
+
+func (x *CheckObjectsExistResponse_RevisionExistence) GetName() []byte {
+	if x != nil {
+		return x.Name
+	}
+	return nil
+}
+
+func (x *CheckObjectsExistResponse_RevisionExistence) GetExists() bool {
+	if x != nil {
+		return x.Exists
+	}
+	return false
+}
+
 var File_commit_proto protoreflect.FileDescriptor
 
 var file_commit_proto_rawDesc = []byte{
@@ -4063,139 +4225,164 @@ var file_commit_proto_rawDesc = []byte{
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+	0x31, 0x34, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x6f, 0x2f, 0x67, 0x69, 0x74, 0x61,
+	0x6c, 0x79, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -4211,7 +4398,7 @@ 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, 53)
 var file_commit_proto_goTypes = []interface{}{
 	(ListCommitsRequest_Order)(0),                        // 0: gitaly.ListCommitsRequest.Order
 	(TreeEntryResponse_ObjectType)(0),                    // 1: gitaly.TreeEntryResponse.ObjectType
@@ -4266,124 +4453,131 @@ 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
+	(*CheckObjectsExistResponse_RevisionExistence)(nil),  // 58: gitaly.CheckObjectsExistResponse.RevisionExistence
+	(*Repository)(nil),                                   // 59: gitaly.Repository
+	(*PaginationParameter)(nil),                          // 60: gitaly.PaginationParameter
+	(*timestamppb.Timestamp)(nil),                        // 61: google.protobuf.Timestamp
+	(*GitCommit)(nil),                                    // 62: gitaly.GitCommit
+	(*GlobalOptions)(nil),                                // 63: gitaly.GlobalOptions
+	(*PaginationCursor)(nil),                             // 64: 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
+	59, // 0: gitaly.ListCommitsRequest.repository:type_name -> gitaly.Repository
+	60, // 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
+	61, // 3: gitaly.ListCommitsRequest.after:type_name -> google.protobuf.Timestamp
+	61, // 4: gitaly.ListCommitsRequest.before:type_name -> google.protobuf.Timestamp
+	62, // 5: gitaly.ListCommitsResponse.commits:type_name -> gitaly.GitCommit
+	59, // 6: gitaly.ListAllCommitsRequest.repository:type_name -> gitaly.Repository
+	60, // 7: gitaly.ListAllCommitsRequest.pagination_params:type_name -> gitaly.PaginationParameter
+	62, // 8: gitaly.ListAllCommitsResponse.commits:type_name -> gitaly.GitCommit
+	59, // 9: gitaly.CommitStatsRequest.repository:type_name -> gitaly.Repository
+	59, // 10: gitaly.CommitIsAncestorRequest.repository:type_name -> gitaly.Repository
+	59, // 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
+	59, // 13: gitaly.CountCommitsRequest.repository:type_name -> gitaly.Repository
+	61, // 14: gitaly.CountCommitsRequest.after:type_name -> google.protobuf.Timestamp
+	61, // 15: gitaly.CountCommitsRequest.before:type_name -> google.protobuf.Timestamp
+	63, // 16: gitaly.CountCommitsRequest.global_options:type_name -> gitaly.GlobalOptions
+	59, // 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
+	59, // 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
+	60, // 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
+	64, // 23: gitaly.GetTreeEntriesResponse.pagination_cursor:type_name -> gitaly.PaginationCursor
+	59, // 24: gitaly.ListFilesRequest.repository:type_name -> gitaly.Repository
+	59, // 25: gitaly.FindCommitRequest.repository:type_name -> gitaly.Repository
+	62, // 26: gitaly.FindCommitResponse.commit:type_name -> gitaly.GitCommit
+	59, // 27: gitaly.ListCommitsByOidRequest.repository:type_name -> gitaly.Repository
+	62, // 28: gitaly.ListCommitsByOidResponse.commits:type_name -> gitaly.GitCommit
+	59, // 29: gitaly.ListCommitsByRefNameRequest.repository:type_name -> gitaly.Repository
+	55, // 30: gitaly.ListCommitsByRefNameResponse.commit_refs:type_name -> gitaly.ListCommitsByRefNameResponse.CommitForRef
+	59, // 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
+	62, // 33: gitaly.FindAllCommitsResponse.commits:type_name -> gitaly.GitCommit
+	59, // 34: gitaly.FindCommitsRequest.repository:type_name -> gitaly.Repository
+	61, // 35: gitaly.FindCommitsRequest.after:type_name -> google.protobuf.Timestamp
+	61, // 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
+	63, // 38: gitaly.FindCommitsRequest.global_options:type_name -> gitaly.GlobalOptions
+	62, // 39: gitaly.FindCommitsResponse.commits:type_name -> gitaly.GitCommit
+	59, // 40: gitaly.CommitLanguagesRequest.repository:type_name -> gitaly.Repository
+	56, // 41: gitaly.CommitLanguagesResponse.languages:type_name -> gitaly.CommitLanguagesResponse.Language
+	59, // 42: gitaly.RawBlameRequest.repository:type_name -> gitaly.Repository
+	59, // 43: gitaly.LastCommitForPathRequest.repository:type_name -> gitaly.Repository
+	63, // 44: gitaly.LastCommitForPathRequest.global_options:type_name -> gitaly.GlobalOptions
+	62, // 45: gitaly.LastCommitForPathResponse.commit:type_name -> gitaly.GitCommit
+	59, // 46: gitaly.ListLastCommitsForTreeRequest.repository:type_name -> gitaly.Repository
+	63, // 47: gitaly.ListLastCommitsForTreeRequest.global_options:type_name -> gitaly.GlobalOptions
+	57, // 48: gitaly.ListLastCommitsForTreeResponse.commits:type_name -> gitaly.ListLastCommitsForTreeResponse.CommitForTree
+	59, // 49: gitaly.CommitsByMessageRequest.repository:type_name -> gitaly.Repository
+	63, // 50: gitaly.CommitsByMessageRequest.global_options:type_name -> gitaly.GlobalOptions
+	62, // 51: gitaly.CommitsByMessageResponse.commits:type_name -> gitaly.GitCommit
+	59, // 52: gitaly.FilterShasWithSignaturesRequest.repository:type_name -> gitaly.Repository
+	59, // 53: gitaly.ExtractCommitSignatureRequest.repository:type_name -> gitaly.Repository
+	59, // 54: gitaly.GetCommitSignaturesRequest.repository:type_name -> gitaly.Repository
+	59, // 55: gitaly.GetCommitMessagesRequest.repository:type_name -> gitaly.Repository
+	59, // 56: gitaly.CheckObjectsExistRequest.repository:type_name -> gitaly.Repository
+	58, // 57: gitaly.CheckObjectsExistResponse.revisions:type_name -> gitaly.CheckObjectsExistResponse.RevisionExistence
+	62, // 58: gitaly.ListCommitsByRefNameResponse.CommitForRef.commit:type_name -> gitaly.GitCommit
+	62, // 59: gitaly.ListLastCommitsForTreeResponse.CommitForTree.commit:type_name -> gitaly.GitCommit
+	6,  // 60: gitaly.CommitService.ListCommits:input_type -> gitaly.ListCommitsRequest
+	8,  // 61: gitaly.CommitService.ListAllCommits:input_type -> gitaly.ListAllCommitsRequest
+	12, // 62: gitaly.CommitService.CommitIsAncestor:input_type -> gitaly.CommitIsAncestorRequest
+	14, // 63: gitaly.CommitService.TreeEntry:input_type -> gitaly.TreeEntryRequest
+	16, // 64: gitaly.CommitService.CountCommits:input_type -> gitaly.CountCommitsRequest
+	18, // 65: gitaly.CommitService.CountDivergingCommits:input_type -> gitaly.CountDivergingCommitsRequest
+	21, // 66: gitaly.CommitService.GetTreeEntries:input_type -> gitaly.GetTreeEntriesRequest
+	23, // 67: gitaly.CommitService.ListFiles:input_type -> gitaly.ListFilesRequest
+	25, // 68: gitaly.CommitService.FindCommit:input_type -> gitaly.FindCommitRequest
+	10, // 69: gitaly.CommitService.CommitStats:input_type -> gitaly.CommitStatsRequest
+	31, // 70: gitaly.CommitService.FindAllCommits:input_type -> gitaly.FindAllCommitsRequest
+	33, // 71: gitaly.CommitService.FindCommits:input_type -> gitaly.FindCommitsRequest
+	35, // 72: gitaly.CommitService.CommitLanguages:input_type -> gitaly.CommitLanguagesRequest
+	37, // 73: gitaly.CommitService.RawBlame:input_type -> gitaly.RawBlameRequest
+	39, // 74: gitaly.CommitService.LastCommitForPath:input_type -> gitaly.LastCommitForPathRequest
+	41, // 75: gitaly.CommitService.ListLastCommitsForTree:input_type -> gitaly.ListLastCommitsForTreeRequest
+	43, // 76: gitaly.CommitService.CommitsByMessage:input_type -> gitaly.CommitsByMessageRequest
+	27, // 77: gitaly.CommitService.ListCommitsByOid:input_type -> gitaly.ListCommitsByOidRequest
+	29, // 78: gitaly.CommitService.ListCommitsByRefName:input_type -> gitaly.ListCommitsByRefNameRequest
+	45, // 79: gitaly.CommitService.FilterShasWithSignatures:input_type -> gitaly.FilterShasWithSignaturesRequest
+	49, // 80: gitaly.CommitService.GetCommitSignatures:input_type -> gitaly.GetCommitSignaturesRequest
+	51, // 81: gitaly.CommitService.GetCommitMessages:input_type -> gitaly.GetCommitMessagesRequest
+	53, // 82: gitaly.CommitService.CheckObjectsExist:input_type -> gitaly.CheckObjectsExistRequest
+	7,  // 83: gitaly.CommitService.ListCommits:output_type -> gitaly.ListCommitsResponse
+	9,  // 84: gitaly.CommitService.ListAllCommits:output_type -> gitaly.ListAllCommitsResponse
+	13, // 85: gitaly.CommitService.CommitIsAncestor:output_type -> gitaly.CommitIsAncestorResponse
+	15, // 86: gitaly.CommitService.TreeEntry:output_type -> gitaly.TreeEntryResponse
+	17, // 87: gitaly.CommitService.CountCommits:output_type -> gitaly.CountCommitsResponse
+	19, // 88: gitaly.CommitService.CountDivergingCommits:output_type -> gitaly.CountDivergingCommitsResponse
+	22, // 89: gitaly.CommitService.GetTreeEntries:output_type -> gitaly.GetTreeEntriesResponse
+	24, // 90: gitaly.CommitService.ListFiles:output_type -> gitaly.ListFilesResponse
+	26, // 91: gitaly.CommitService.FindCommit:output_type -> gitaly.FindCommitResponse
+	11, // 92: gitaly.CommitService.CommitStats:output_type -> gitaly.CommitStatsResponse
+	32, // 93: gitaly.CommitService.FindAllCommits:output_type -> gitaly.FindAllCommitsResponse
+	34, // 94: gitaly.CommitService.FindCommits:output_type -> gitaly.FindCommitsResponse
+	36, // 95: gitaly.CommitService.CommitLanguages:output_type -> gitaly.CommitLanguagesResponse
+	38, // 96: gitaly.CommitService.RawBlame:output_type -> gitaly.RawBlameResponse
+	40, // 97: gitaly.CommitService.LastCommitForPath:output_type -> gitaly.LastCommitForPathResponse
+	42, // 98: gitaly.CommitService.ListLastCommitsForTree:output_type -> gitaly.ListLastCommitsForTreeResponse
+	44, // 99: gitaly.CommitService.CommitsByMessage:output_type -> gitaly.CommitsByMessageResponse
+	28, // 100: gitaly.CommitService.ListCommitsByOid:output_type -> gitaly.ListCommitsByOidResponse
+	30, // 101: gitaly.CommitService.ListCommitsByRefName:output_type -> gitaly.ListCommitsByRefNameResponse
+	46, // 102: gitaly.CommitService.FilterShasWithSignatures:output_type -> gitaly.FilterShasWithSignaturesResponse
+	50, // 103: gitaly.CommitService.GetCommitSignatures:output_type -> gitaly.GetCommitSignaturesResponse
+	52, // 104: gitaly.CommitService.GetCommitMessages:output_type -> gitaly.GetCommitMessagesResponse
+	54, // 105: gitaly.CommitService.CheckObjectsExist:output_type -> gitaly.CheckObjectsExistResponse
+	83, // [83:106] is the sub-list for method output_type
+	60, // [60:83] is the sub-list for method input_type
+	60, // [60:60] is the sub-list for extension type_name
+	60, // [60:60] is the sub-list for extension extendee
+	0,  // [0:60] is the sub-list for field type_name
 }
 
 func init() { file_commit_proto_init() }
@@ -4959,7 +5153,7 @@ 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:
@@ -4971,7 +5165,7 @@ 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:
@@ -4983,6 +5177,30 @@ 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
@@ -4994,6 +5212,18 @@ func file_commit_proto_init() {
 				return nil
 			}
 		}
+		file_commit_proto_msgTypes[52].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CheckObjectsExistResponse_RevisionExistence); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -5001,7 +5231,7 @@ func file_commit_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_commit_proto_rawDesc,
 			NumEnums:      6,
-			NumMessages:   50,
+			NumMessages:   53,
 			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",
 }