commit: Adds max batch size per file type

Why?

https://gitlab.com/gitlab-org/gitlab/-/issues/17698

On 14.5 we added improved diffs for Python Notebook (ipynbs). These
are larges that have embedded images, and the limit of 512kb makes
blocks the improved diffs from being displayed in the majority of
cases. But we don't want to increase the diff size for all file
types, since that could lead to performance degradation, only to
files that really need it. The size of the diff will be controlled
from the consumer side.

What?

Adds a new option to the CommitDiffRequest that allows users to
specify a different maximum value per file type. This value will
override MaxPatchBytes and SafeMaxPatchBytes, but not MaxBytes or
SafeMaxBytes.

Changelog: added

6 files changed, 420 insertions, 256 deletions

diff --git a/internal/gitaly/diff/diff.go b/internal/gitaly/diff/diff.go
index f33c630e1..5f9bec941 100644
--- a/internal/gitaly/diff/diff.go
+++ b/internal/gitaly/diff/diff.go
@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"path/filepath"
 	"regexp"
 	"strconv"
 
@@ -75,6 +76,8 @@ type Limits struct {
 	SafeMaxBytes int
 	// Number of bytes a single patch can have. Patches surpassing this limit are pruned / nullified.
 	MaxPatchBytes int
+	// Max number of bytes for specific file type. This overrides MaxPatchBytes
+	MaxPatchBytesForFileExtension map[string]int
 }
 
 const (
@@ -179,8 +182,7 @@ func (parser *Parser) Parse() bool {
 	}
 
 	if parser.limits.EnforceLimits {
-		// Apply single-file size limit
-		if len(parser.currentDiff.Patch) >= parser.limits.MaxPatchBytes {
+		if len(parser.currentDiff.Patch) >= parser.maxPatchBytesForCurrentFile() {
 			parser.prunePatch()
 			parser.currentDiff.TooLarge = true
 		}
@@ -236,6 +238,27 @@ func (parser *Parser) isOverSafeLimits() bool {
 		parser.bytesProcessed > parser.limits.SafeMaxBytes
 }
 
+func (parser *Parser) maxPatchBytesForCurrentFile() int {
+	return maxPatchBytesFor(parser.limits.MaxPatchBytes, parser.limits.MaxPatchBytesForFileExtension, parser.Diff().ToPath)
+}
+
+func maxPatchBytesFor(maxPatchBytes int, maxBytesForExtension map[string]int, toPath []byte) int {
+	if len(maxBytesForExtension) > 0 {
+		fileName := filepath.Base(string(toPath))
+		key := filepath.Ext(fileName)
+
+		if key == "" {
+			key = fileName
+		}
+
+		if limitForExtension, ok := maxBytesForExtension[key]; ok {
+			return limitForExtension
+		}
+	}
+
+	return maxPatchBytes
+}
+
 func min(x, y int) int {
 	if x < y {
 		return x
diff --git a/internal/gitaly/diff/diff_test.go b/internal/gitaly/diff/diff_test.go
index 59a38d6f4..99586c5c0 100644
--- a/internal/gitaly/diff/diff_test.go
+++ b/internal/gitaly/diff/diff_test.go
@@ -487,6 +487,60 @@ func TestDiffLimitsBeingEnforcedByUpperBound(t *testing.T) {
 	require.Equal(t, diffParser.limits.MaxPatchBytes, 0)
 }
 
+// Test larger file type below limit, above original limit
+func TestDiffFileBeingBelowLimitForExtension(t *testing.T) {
+	header := `:000000 100644 0000000000000000000000000000000000000000 b6507e5b5ce18077e3ec8aaa2291404e5051d45d A	big.txt
+:000000 100644 0000000000000000000000000000000000000000 b6507e5b5ce18077e3ec8aaa2291404e5051d45d A	big.md
+
+`
+	bigLine := strings.Repeat("z", 100)
+	bigPatch := "@@ -0,0 +1,100 @@\n+" + strings.Repeat(fmt.Sprintf("+%s\n", bigLine), 100)
+
+	txtHeader := `diff --git a/big.txt b/big.txt
+new file mode 100644
+index 0000000000000000000000000000000000000000..4cc7061661b8f52891bc1b39feb4d856b21a1067
+--- /dev/null
++++ b/big.txt
+`
+
+	mdHeader := `diff --git a/big.md b/big.md
+new file mode 100644
+index 0000000000000000000000000000000000000000..4cc7061661b8f52891bc1b39feb4d856b21a1067
+--- /dev/null
++++ b/big.md
+`
+	rawDiff := header + txtHeader + bigPatch + mdHeader + bigPatch
+
+	fmt.Println(len(bigPatch))
+
+	limits := Limits{
+		EnforceLimits: true,
+		MaxPatchBytes: 100,
+		MaxBytes:      safeMaxBytesUpperBound,
+		SafeMaxBytes:  safeMaxBytesUpperBound,
+		MaxFiles:      maxFilesUpperBound,
+		SafeMaxFiles:  maxFilesUpperBound,
+		MaxLines:      maxLinesUpperBound,
+		SafeMaxLines:  maxLinesUpperBound,
+		CollapseDiffs: true,
+		MaxPatchBytesForFileExtension: map[string]int{
+			".txt": 30000,
+		},
+	}
+
+	diffs := getDiffs(t, rawDiff, limits)
+
+	// .txt has increased limits
+	require.False(t, diffs[0].Collapsed)
+	require.False(t, diffs[0].TooLarge)
+	require.Equal(t, diffs[0].Patch, []byte(bigPatch))
+
+	// .md does not
+	require.False(t, diffs[1].Collapsed)
+	require.True(t, diffs[1].TooLarge)
+	require.Equal(t, diffs[1].Patch, []byte(nil))
+}
+
 func getDiffs(tb testing.TB, rawDiff string, limits Limits) []*Diff {
 	tb.Helper()
 
@@ -542,3 +596,29 @@ index 0000000000000000000000000000000000000000..c3ae147b03a2d1fd89b25198b3fc5302
 		}
 	})
 }
+
+func Test_maxPatchBytesFor(t *testing.T) {
+	maxBytesForExtension := map[string]int{".txt": 2, "Dockerfile": 3, ".gitignore": 4}
+	maxPatchBytes := 1
+
+	tests := []struct {
+		name   string
+		toPath []byte
+		expect int
+	}{
+		{"File's extension matches custom limits", []byte("test.txt"), 2},
+		{"File full name matches custom limits", []byte("blah/Dockerfile"), 3},
+		{"File extension does not match custom limits ", []byte("test.md"), 1},
+		{"Dot file matches custom limits", []byte(".gitignore"), 4},
+		{"File full name does not match custom limits", []byte("test"), 1},
+		{"File last extension does not match custom limits", []byte("test.txt.md"), 1},
+		{"File last extension does match custom limits", []byte("test.md.txt"), 2},
+		{"File path is nil", nil, 1},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := maxPatchBytesFor(maxPatchBytes, maxBytesForExtension, tc.toPath)
+			require.Equalf(t, tc.expect, got, "maxPatchBytesFor() = %v, want %v", got, tc.expect)
+		})
+	}
+}
diff --git a/internal/gitaly/service/diff/commit.go b/internal/gitaly/service/diff/commit.go
index 3624a4873..40bb21fc0 100644
--- a/internal/gitaly/service/diff/commit.go
+++ b/internal/gitaly/service/diff/commit.go
@@ -67,6 +67,14 @@ func (s *server) CommitDiff(in *gitalypb.CommitDiffRequest, stream gitalypb.Diff
 		limits.MaxLines = int(in.MaxLines)
 		limits.MaxBytes = int(in.MaxBytes)
 		limits.MaxPatchBytes = int(in.MaxPatchBytes)
+
+		if len(in.MaxPatchBytesForFileExtension) > 0 {
+			limits.MaxPatchBytesForFileExtension = map[string]int{}
+
+			for extension, size := range in.MaxPatchBytesForFileExtension {
+				limits.MaxPatchBytesForFileExtension[extension] = int(size)
+			}
+		}
 	}
 	limits.CollapseDiffs = in.CollapseDiffs
 	limits.SafeMaxFiles = int(in.SafeMaxFiles)
diff --git a/internal/gitaly/service/diff/commit_test.go b/internal/gitaly/service/diff/commit_test.go
index 4729042b3..97021bf40 100644
--- a/internal/gitaly/service/diff/commit_test.go
+++ b/internal/gitaly/service/diff/commit_test.go
@@ -699,6 +699,28 @@ func TestSuccessfulCommitDiffRequestWithLimits(t *testing.T) {
 			},
 		},
 		{
+			desc: "max patch bytes for file type",
+			request: &gitalypb.CommitDiffRequest{
+				EnforceLimits:                 true,
+				CollapseDiffs:                 false,
+				MaxFiles:                      5,
+				MaxLines:                      1000,
+				MaxBytes:                      3 * 5 * 1024,
+				SafeMaxFiles:                  3,
+				SafeMaxLines:                  1000,
+				SafeMaxBytes:                  1 * 5 * 1024,
+				MaxPatchBytes:                 1200,
+				MaxPatchBytesForFileExtension: map[string]int32{".md": 10000},
+			},
+			result: []diffAttributes{
+				{path: "CHANGELOG", tooLarge: true},
+				{path: "CONTRIBUTING.md", tooLarge: false},
+				{path: "LICENSE", tooLarge: false},
+				{path: "PROCESS.md", tooLarge: false},
+				{path: "VERSION", tooLarge: false},
+			},
+		},
+		{
 			desc: "collapse after safe max file count is exceeded",
 			request: &gitalypb.CommitDiffRequest{
 				EnforceLimits: true,
diff --git a/proto/diff.proto b/proto/diff.proto
index 6905af2c4..ab2900d95 100644
--- a/proto/diff.proto
+++ b/proto/diff.proto
@@ -109,6 +109,11 @@ message CommitDiffRequest {
 
   // DiffMode is the mode used for generating the diff. Please refer to the enum declaration for supported modes.
   DiffMode diff_mode = 15;
+
+  // Overrides max patch bytes for file extension.
+  // If the file does not have an extension (eg Dockerfile), then the file name is used for matching.
+  // For files with more than on extension (eg file.html.tmpl) only the last extension is matched.
+  map<string, int32> max_patch_bytes_for_file_extension = 16;
 }
 
 // A CommitDiffResponse corresponds to a single changed file in a commit.
diff --git a/proto/go/gitalypb/diff.pb.go b/proto/go/gitalypb/diff.pb.go
index 10d55083b..3b15a7c79 100644
--- a/proto/go/gitalypb/diff.pb.go
+++ b/proto/go/gitalypb/diff.pb.go
@@ -168,6 +168,10 @@ type CommitDiffRequest struct {
 	SafeMaxBytes int32 `protobuf:"varint,13,opt,name=safe_max_bytes,json=safeMaxBytes,proto3" json:"safe_max_bytes,omitempty"`
 	// DiffMode is the mode used for generating the diff. Please refer to the enum declaration for supported modes.
 	DiffMode CommitDiffRequest_DiffMode `protobuf:"varint,15,opt,name=diff_mode,json=diffMode,proto3,enum=gitaly.CommitDiffRequest_DiffMode" json:"diff_mode,omitempty"`
+	// Overrides max patch bytes for file extension.
+	// If the file does not have an extension (eg Dockerfile), then the file name is used for matching.
+	// For files with more than on extension (eg file.html.tmpl) only the last extension is matched.
+	MaxPatchBytesForFileExtension map[string]int32 `protobuf:"bytes,16,rep,name=max_patch_bytes_for_file_extension,json=maxPatchBytesForFileExtension,proto3" json:"max_patch_bytes_for_file_extension,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
 }
 
 func (x *CommitDiffRequest) Reset() {
@@ -307,6 +311,13 @@ func (x *CommitDiffRequest) GetDiffMode() CommitDiffRequest_DiffMode {
 	return CommitDiffRequest_DEFAULT
 }
 
+func (x *CommitDiffRequest) GetMaxPatchBytesForFileExtension() map[string]int32 {
+	if x != nil {
+		return x.MaxPatchBytesForFileExtension
+	}
+	return nil
+}
+
 // A CommitDiffResponse corresponds to a single changed file in a commit.
 type CommitDiffResponse struct {
 	state         protoimpl.MessageState
@@ -1443,7 +1454,7 @@ type FindChangedPathsRequest_Request struct {
 func (x *FindChangedPathsRequest_Request) Reset() {
 	*x = FindChangedPathsRequest_Request{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_diff_proto_msgTypes[17]
+		mi := &file_diff_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1456,7 +1467,7 @@ func (x *FindChangedPathsRequest_Request) String() string {
 func (*FindChangedPathsRequest_Request) ProtoMessage() {}
 
 func (x *FindChangedPathsRequest_Request) ProtoReflect() protoreflect.Message {
-	mi := &file_diff_proto_msgTypes[17]
+	mi := &file_diff_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1528,7 +1539,7 @@ type FindChangedPathsRequest_Request_TreeRequest struct {
 func (x *FindChangedPathsRequest_Request_TreeRequest) Reset() {
 	*x = FindChangedPathsRequest_Request_TreeRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_diff_proto_msgTypes[18]
+		mi := &file_diff_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1541,7 +1552,7 @@ func (x *FindChangedPathsRequest_Request_TreeRequest) String() string {
 func (*FindChangedPathsRequest_Request_TreeRequest) ProtoMessage() {}
 
 func (x *FindChangedPathsRequest_Request_TreeRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_diff_proto_msgTypes[18]
+	mi := &file_diff_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1590,7 +1601,7 @@ type FindChangedPathsRequest_Request_CommitRequest struct {
 func (x *FindChangedPathsRequest_Request_CommitRequest) Reset() {
 	*x = FindChangedPathsRequest_Request_CommitRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_diff_proto_msgTypes[19]
+		mi := &file_diff_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1603,7 +1614,7 @@ func (x *FindChangedPathsRequest_Request_CommitRequest) String() string {
 func (*FindChangedPathsRequest_Request_CommitRequest) ProtoMessage() {}
 
 func (x *FindChangedPathsRequest_Request_CommitRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_diff_proto_msgTypes[19]
+	mi := &file_diff_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1638,8 +1649,8 @@ var File_diff_proto protoreflect.FileDescriptor
 var file_diff_proto_rawDesc = []byte{
 	0x0a, 0x0a, 0x64, 0x69, 0x66, 0x66, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x06, 0x67, 0x69,
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 }
 
 var (
@@ -1900,7 +1924,7 @@ func file_diff_proto_rawDescGZIP() []byte {
 }
 
 var file_diff_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_diff_proto_msgTypes = make([]protoimpl.MessageInfo, 20)
+var file_diff_proto_msgTypes = make([]protoimpl.MessageInfo, 21)
 var file_diff_proto_goTypes = []interface{}{
 	(CommitDiffRequest_DiffMode)(0),                       // 0: gitaly.CommitDiffRequest.DiffMode
 	(ChangedPaths_Status)(0),                              // 1: gitaly.ChangedPaths.Status
@@ -1921,46 +1945,48 @@ var file_diff_proto_goTypes = []interface{}{
 	(*ChangedPaths)(nil),                                  // 16: gitaly.ChangedPaths
 	(*GetPatchIDRequest)(nil),                             // 17: gitaly.GetPatchIDRequest
 	(*GetPatchIDResponse)(nil),                            // 18: gitaly.GetPatchIDResponse
-	(*FindChangedPathsRequest_Request)(nil),               // 19: gitaly.FindChangedPathsRequest.Request
-	(*FindChangedPathsRequest_Request_TreeRequest)(nil),   // 20: gitaly.FindChangedPathsRequest.Request.TreeRequest
-	(*FindChangedPathsRequest_Request_CommitRequest)(nil), // 21: gitaly.FindChangedPathsRequest.Request.CommitRequest
-	(*Repository)(nil),                                    // 22: gitaly.Repository
+	nil,                                                   // 19: gitaly.CommitDiffRequest.MaxPatchBytesForFileExtensionEntry
+	(*FindChangedPathsRequest_Request)(nil),               // 20: gitaly.FindChangedPathsRequest.Request
+	(*FindChangedPathsRequest_Request_TreeRequest)(nil),   // 21: gitaly.FindChangedPathsRequest.Request.TreeRequest
+	(*FindChangedPathsRequest_Request_CommitRequest)(nil), // 22: gitaly.FindChangedPathsRequest.Request.CommitRequest
+	(*Repository)(nil),                                    // 23: gitaly.Repository
 }
 var file_diff_proto_depIdxs = []int32{
-	22, // 0: gitaly.CommitDiffRequest.repository:type_name -> gitaly.Repository
+	23, // 0: gitaly.CommitDiffRequest.repository:type_name -> gitaly.Repository
 	0,  // 1: gitaly.CommitDiffRequest.diff_mode:type_name -> gitaly.CommitDiffRequest.DiffMode
-	22, // 2: gitaly.CommitDeltaRequest.repository:type_name -> gitaly.Repository
-	5,  // 3: gitaly.CommitDeltaResponse.deltas:type_name -> gitaly.CommitDelta
-	22, // 4: gitaly.RawDiffRequest.repository:type_name -> gitaly.Repository
-	22, // 5: gitaly.RawPatchRequest.repository:type_name -> gitaly.Repository
-	22, // 6: gitaly.DiffStatsRequest.repository:type_name -> gitaly.Repository
-	12, // 7: gitaly.DiffStatsResponse.stats:type_name -> gitaly.DiffStats
-	22, // 8: gitaly.FindChangedPathsRequest.repository:type_name -> gitaly.Repository
-	19, // 9: gitaly.FindChangedPathsRequest.requests:type_name -> gitaly.FindChangedPathsRequest.Request
-	16, // 10: gitaly.FindChangedPathsResponse.paths:type_name -> gitaly.ChangedPaths
-	1,  // 11: gitaly.ChangedPaths.status:type_name -> gitaly.ChangedPaths.Status
-	22, // 12: gitaly.GetPatchIDRequest.repository:type_name -> gitaly.Repository
-	20, // 13: gitaly.FindChangedPathsRequest.Request.tree_request:type_name -> gitaly.FindChangedPathsRequest.Request.TreeRequest
-	21, // 14: gitaly.FindChangedPathsRequest.Request.commit_request:type_name -> gitaly.FindChangedPathsRequest.Request.CommitRequest
-	2,  // 15: gitaly.DiffService.CommitDiff:input_type -> gitaly.CommitDiffRequest
-	4,  // 16: gitaly.DiffService.CommitDelta:input_type -> gitaly.CommitDeltaRequest
-	7,  // 17: gitaly.DiffService.RawDiff:input_type -> gitaly.RawDiffRequest
-	9,  // 18: gitaly.DiffService.RawPatch:input_type -> gitaly.RawPatchRequest
-	11, // 19: gitaly.DiffService.DiffStats:input_type -> gitaly.DiffStatsRequest
-	14, // 20: gitaly.DiffService.FindChangedPaths:input_type -> gitaly.FindChangedPathsRequest
-	17, // 21: gitaly.DiffService.GetPatchID:input_type -> gitaly.GetPatchIDRequest
-	3,  // 22: gitaly.DiffService.CommitDiff:output_type -> gitaly.CommitDiffResponse
-	6,  // 23: gitaly.DiffService.CommitDelta:output_type -> gitaly.CommitDeltaResponse
-	8,  // 24: gitaly.DiffService.RawDiff:output_type -> gitaly.RawDiffResponse
-	10, // 25: gitaly.DiffService.RawPatch:output_type -> gitaly.RawPatchResponse
-	13, // 26: gitaly.DiffService.DiffStats:output_type -> gitaly.DiffStatsResponse
-	15, // 27: gitaly.DiffService.FindChangedPaths:output_type -> gitaly.FindChangedPathsResponse
-	18, // 28: gitaly.DiffService.GetPatchID:output_type -> gitaly.GetPatchIDResponse
-	22, // [22:29] is the sub-list for method output_type
-	15, // [15:22] is the sub-list for method input_type
-	15, // [15:15] is the sub-list for extension type_name
-	15, // [15:15] is the sub-list for extension extendee
-	0,  // [0:15] is the sub-list for field type_name
+	19, // 2: gitaly.CommitDiffRequest.max_patch_bytes_for_file_extension:type_name -> gitaly.CommitDiffRequest.MaxPatchBytesForFileExtensionEntry
+	23, // 3: gitaly.CommitDeltaRequest.repository:type_name -> gitaly.Repository
+	5,  // 4: gitaly.CommitDeltaResponse.deltas:type_name -> gitaly.CommitDelta
+	23, // 5: gitaly.RawDiffRequest.repository:type_name -> gitaly.Repository
+	23, // 6: gitaly.RawPatchRequest.repository:type_name -> gitaly.Repository
+	23, // 7: gitaly.DiffStatsRequest.repository:type_name -> gitaly.Repository
+	12, // 8: gitaly.DiffStatsResponse.stats:type_name -> gitaly.DiffStats
+	23, // 9: gitaly.FindChangedPathsRequest.repository:type_name -> gitaly.Repository
+	20, // 10: gitaly.FindChangedPathsRequest.requests:type_name -> gitaly.FindChangedPathsRequest.Request
+	16, // 11: gitaly.FindChangedPathsResponse.paths:type_name -> gitaly.ChangedPaths
+	1,  // 12: gitaly.ChangedPaths.status:type_name -> gitaly.ChangedPaths.Status
+	23, // 13: gitaly.GetPatchIDRequest.repository:type_name -> gitaly.Repository
+	21, // 14: gitaly.FindChangedPathsRequest.Request.tree_request:type_name -> gitaly.FindChangedPathsRequest.Request.TreeRequest
+	22, // 15: gitaly.FindChangedPathsRequest.Request.commit_request:type_name -> gitaly.FindChangedPathsRequest.Request.CommitRequest
+	2,  // 16: gitaly.DiffService.CommitDiff:input_type -> gitaly.CommitDiffRequest
+	4,  // 17: gitaly.DiffService.CommitDelta:input_type -> gitaly.CommitDeltaRequest
+	7,  // 18: gitaly.DiffService.RawDiff:input_type -> gitaly.RawDiffRequest
+	9,  // 19: gitaly.DiffService.RawPatch:input_type -> gitaly.RawPatchRequest
+	11, // 20: gitaly.DiffService.DiffStats:input_type -> gitaly.DiffStatsRequest
+	14, // 21: gitaly.DiffService.FindChangedPaths:input_type -> gitaly.FindChangedPathsRequest
+	17, // 22: gitaly.DiffService.GetPatchID:input_type -> gitaly.GetPatchIDRequest
+	3,  // 23: gitaly.DiffService.CommitDiff:output_type -> gitaly.CommitDiffResponse
+	6,  // 24: gitaly.DiffService.CommitDelta:output_type -> gitaly.CommitDeltaResponse
+	8,  // 25: gitaly.DiffService.RawDiff:output_type -> gitaly.RawDiffResponse
+	10, // 26: gitaly.DiffService.RawPatch:output_type -> gitaly.RawPatchResponse
+	13, // 27: gitaly.DiffService.DiffStats:output_type -> gitaly.DiffStatsResponse
+	15, // 28: gitaly.DiffService.FindChangedPaths:output_type -> gitaly.FindChangedPathsResponse
+	18, // 29: gitaly.DiffService.GetPatchID:output_type -> gitaly.GetPatchIDResponse
+	23, // [23:30] is the sub-list for method output_type
+	16, // [16:23] is the sub-list for method input_type
+	16, // [16:16] is the sub-list for extension type_name
+	16, // [16:16] is the sub-list for extension extendee
+	0,  // [0:16] is the sub-list for field type_name
 }
 
 func init() { file_diff_proto_init() }
@@ -2175,7 +2201,7 @@ func file_diff_proto_init() {
 				return nil
 			}
 		}
-		file_diff_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+		file_diff_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FindChangedPathsRequest_Request); i {
 			case 0:
 				return &v.state
@@ -2187,7 +2213,7 @@ func file_diff_proto_init() {
 				return nil
 			}
 		}
-		file_diff_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
+		file_diff_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FindChangedPathsRequest_Request_TreeRequest); i {
 			case 0:
 				return &v.state
@@ -2199,7 +2225,7 @@ func file_diff_proto_init() {
 				return nil
 			}
 		}
-		file_diff_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
+		file_diff_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FindChangedPathsRequest_Request_CommitRequest); i {
 			case 0:
 				return &v.state
@@ -2212,7 +2238,7 @@ func file_diff_proto_init() {
 			}
 		}
 	}
-	file_diff_proto_msgTypes[17].OneofWrappers = []interface{}{
+	file_diff_proto_msgTypes[18].OneofWrappers = []interface{}{
 		(*FindChangedPathsRequest_Request_TreeRequest_)(nil),
 		(*FindChangedPathsRequest_Request_CommitRequest_)(nil),
 	}
@@ -2222,7 +2248,7 @@ func file_diff_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_diff_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   20,
+			NumMessages:   21,
 			NumExtensions: 0,
 			NumServices:   1,
 		},