Merge branch 'mg/code-comments/merge-base-sha' of _OKE5H2PQKOUfzFFDuD4FA/default/CODE/gitness (#43)

2025-05-16 00:50:00 +08:00 · 2023-04-27 12:39:49 +00:00 · 2023-04-27 12:39:49 +00:00 · 1274df59f2
commit 1274df59f2
parent 615ac704d6 be3b68e577
39 changed files with 768 additions and 342 deletions
--- a/gitrpc/commit.go
+++ b/gitrpc/commit.go
@ -197,3 +197,30 @@ func (c *Client) GetCommitDivergences(ctx context.Context,

 	return output, nil
 }
+
+type MergeBaseParams struct {
+	ReadParams
+	Ref1 string
+	Ref2 string
+}
+
+type MergeBaseOutput struct {
+	MergeBaseSHA string
+}
+
+func (c *Client) MergeBase(ctx context.Context,
+	params MergeBaseParams,
+) (MergeBaseOutput, error) {
+	result, err := c.repoService.MergeBase(ctx, &rpc.MergeBaseRequest{
+		Base: mapToRPCReadRequest(params.ReadParams),
+		Ref1: params.Ref1,
+		Ref2: params.Ref2,
+	})
+	if err != nil {
+		return MergeBaseOutput{}, fmt.Errorf("failed to get merge base commit: %w", err)
+	}
+
+	return MergeBaseOutput{
+		MergeBaseSHA: result.MergeBaseSha,
+	}, nil
+}
--- a/gitrpc/diff.go
+++ b/gitrpc/diff.go
@ -164,6 +164,7 @@ type GetDiffHunkHeadersParams struct {
 type DiffFileHeader struct {
 	OldName    string
 	NewName    string
+	Extensions map[string]string
 }

 type HunkHeader struct {
--- a/gitrpc/enum/hunk_headers.go
+++ b/gitrpc/enum/hunk_headers.go
@ -0,0 +1,20 @@
+// Copyright 2022 Harness Inc. All rights reserved.
+// Use of this source code is governed by the Polyform Free Trial License
+// that can be found in the LICENSE.md file for this repository.
+
+package enum
+
+// Diff file header extensions. From: https://git-scm.com/docs/git-diff#generate_patch_text_with_p
+const (
+	DiffExtHeaderOldMode         = "old mode"            // old mode <mode>
+	DiffExtHeaderNewMode         = "new mode"            // new mode <mode>
+	DiffExtHeaderDeletedFileMode = "deleted file mode"   // deleted file mode <mode>
+	DiffExtHeaderNewFileMode     = "new file mode"       // new file mode <mode>
+	DiffExtHeaderCopyFrom        = "copy from"           // copy from <path>
+	DiffExtHeaderCopyTo          = "copy to"             // copy to <path>
+	DiffExtHeaderRenameFrom      = "rename from"         // rename from <path>
+	DiffExtHeaderRenameTo        = "rename to"           // rename to <path>
+	DiffExtHeaderSimilarity      = "similarity index"    // similarity index <number>
+	DiffExtHeaderDissimilarity   = "dissimilarity index" // dissimilarity index <number>
+	DiffExtHeaderIndex           = "index"               // index <hash>..<hash> <mode>
+)
--- a/gitrpc/interface.go
+++ b/gitrpc/interface.go
@ -36,6 +36,7 @@ type Interface interface {
 	ListCommitTags(ctx context.Context, params *ListCommitTagsParams) (*ListCommitTagsOutput, error)
 	GetCommitDivergences(ctx context.Context, params *GetCommitDivergencesParams) (*GetCommitDivergencesOutput, error)
 	CommitFiles(ctx context.Context, params *CommitFilesParams) (CommitFilesResponse, error)
+	MergeBase(ctx context.Context, params MergeBaseParams) (MergeBaseOutput, error)

 	/*
 	 * Git Cli Service
--- a/gitrpc/internal/gitea/commit.go
+++ b/gitrpc/internal/gitea/commit.go
@ -41,7 +41,7 @@ func (g Adapter) GetLatestCommit(ctx context.Context, repoPath string,
 	return mapGiteaCommit(giteaCommit)
 }

-// giteaGetCommitByPath is a copy of gitea code - required as we want latest commit per specific branch.
+// giteaGetCommitByPath returns the latest commit per specific branch.
 func giteaGetCommitByPath(giteaRepo *gitea.Repository, ref string, treePath string) (*gitea.Commit, error) {
 	if treePath == "" {
 		treePath = "."
@ -54,7 +54,9 @@ func giteaGetCommitByPath(giteaRepo *gitea.Repository, ref string, treePath stri
 		return nil, fmt.Errorf("failed to trigger log command: %w", runErr)
 	}

-	giteaCommits, err := giteaParsePrettyFormatLogToList(giteaRepo, stdout)
+	lines := parseLinesToSlice(stdout)
+
+	giteaCommits, err := getGiteaCommits(giteaRepo, lines)
 	if err != nil {
 		return nil, err
 	}
@ -62,19 +64,16 @@ func giteaGetCommitByPath(giteaRepo *gitea.Repository, ref string, treePath stri
 	return giteaCommits[0], nil
 }

-// giteaParsePrettyFormatLogToList is an exact copy of gitea code.
-func giteaParsePrettyFormatLogToList(giteaRepo *gitea.Repository, logs []byte) ([]*gitea.Commit, error) {
+func getGiteaCommits(giteaRepo *gitea.Repository, commitIDs []string) ([]*gitea.Commit, error) {
 	var giteaCommits []*gitea.Commit
-	if len(logs) == 0 {
+	if len(commitIDs) == 0 {
 		return giteaCommits, nil
 	}

-	parts := bytes.Split(logs, []byte{'\n'})
-
-	for _, commitID := range parts {
-		commit, err := giteaRepo.GetCommit(string(commitID))
+	for _, commitID := range commitIDs {
+		commit, err := giteaRepo.GetCommit(commitID)
 		if err != nil {
-			return nil, fmt.Errorf("failed to get commit '%s': %w", string(commitID), err)
+			return nil, fmt.Errorf("failed to get commit '%s': %w", commitID, err)
 		}
 		giteaCommits = append(giteaCommits, commit)
 	}
@ -82,17 +81,10 @@ func giteaParsePrettyFormatLogToList(giteaRepo *gitea.Repository, logs []byte) (
 	return giteaCommits, nil
 }

-// ListCommits lists the commits reachable from ref.
-// Note: ref & afterRef can be Branch / Tag / CommitSHA.
-// Note: commits returned are [ref->...->afterRef).
-func (g Adapter) ListCommits(ctx context.Context, repoPath string,
-	ref string, afterRef string, page int, limit int) ([]types.Commit, error) {
-	giteaRepo, err := gitea.OpenRepository(ctx, repoPath)
-	if err != nil {
-		return nil, err
-	}
-	defer giteaRepo.Close()
-
+func (g Adapter) listCommitSHAs(giteaRepo *gitea.Repository,
+	ref string, afterRef string,
+	page int, limit int,
+) ([]string, error) {
 	args := []string{"rev-list"}

 	// add pagination if requested
@ -120,7 +112,46 @@ func (g Adapter) ListCommits(ctx context.Context, repoPath string,
 		return nil, processGiteaErrorf(runErr, "failed to trigger rev-list command")
 	}

-	giteaCommits, err := giteaParsePrettyFormatLogToList(giteaRepo, bytes.TrimSpace(stdout))
+	return parseLinesToSlice(stdout), nil
+}
+
+// ListCommitSHAs lists the commits reachable from ref.
+// Note: ref & afterRef can be Branch / Tag / CommitSHA.
+// Note: commits returned are [ref->...->afterRef).
+func (g Adapter) ListCommitSHAs(ctx context.Context,
+	repoPath string,
+	ref string, afterRef string,
+	page int, limit int,
+) ([]string, error) {
+	giteaRepo, err := gitea.OpenRepository(ctx, repoPath)
+	if err != nil {
+		return nil, err
+	}
+	defer giteaRepo.Close()
+
+	return g.listCommitSHAs(giteaRepo, ref, afterRef, page, limit)
+}
+
+// ListCommits lists the commits reachable from ref.
+// Note: ref & afterRef can be Branch / Tag / CommitSHA.
+// Note: commits returned are [ref->...->afterRef).
+func (g Adapter) ListCommits(ctx context.Context,
+	repoPath string,
+	ref string, afterRef string,
+	page int, limit int,
+) ([]types.Commit, error) {
+	giteaRepo, err := gitea.OpenRepository(ctx, repoPath)
+	if err != nil {
+		return nil, err
+	}
+	defer giteaRepo.Close()
+
+	commitSHAs, err := g.listCommitSHAs(giteaRepo, ref, afterRef, page, limit)
+	if err != nil {
+		return nil, err
+	}
+
+	giteaCommits, err := getGiteaCommits(giteaRepo, commitSHAs)
 	if err != nil {
 		return nil, err
 	}
@ -264,3 +295,18 @@ func (g Adapter) getCommitDivergence(ctx context.Context, repoPath string,
 		Behind: int32(right),
 	}, nil
 }
+
+func parseLinesToSlice(output []byte) []string {
+	if len(output) == 0 {
+		return nil
+	}
+
+	lines := bytes.Split(bytes.TrimSpace(output), []byte{'\n'})
+
+	slice := make([]string, len(lines))
+	for i, line := range lines {
+		slice[i] = string(line)
+	}
+
+	return slice
+}
--- a/gitrpc/internal/parser/diff_headers.go
+++ b/gitrpc/internal/parser/diff_headers.go
@ -9,6 +9,7 @@ import (
 	"io"
 	"regexp"

+	"github.com/harness/gitness/gitrpc/enum"
 	"github.com/harness/gitness/gitrpc/internal/types"
 )

@ -23,9 +24,34 @@ func ParseDiffFileHeader(line string) (types.DiffFileHeader, bool) {
 	return types.DiffFileHeader{
 		OldFileName: groups[1],
 		NewFileName: groups[2],
+		Extensions:  map[string]string{},
 	}, true
 }

+var regExpDiffExtHeader = regexp.MustCompile(
+	"^(" +
+		enum.DiffExtHeaderOldMode + "|" +
+		enum.DiffExtHeaderNewMode + "|" +
+		enum.DiffExtHeaderDeletedFileMode + "|" +
+		enum.DiffExtHeaderNewFileMode + "|" +
+		enum.DiffExtHeaderCopyFrom + "|" +
+		enum.DiffExtHeaderCopyTo + "|" +
+		enum.DiffExtHeaderRenameFrom + "|" +
+		enum.DiffExtHeaderRenameTo + "|" +
+		enum.DiffExtHeaderSimilarity + "|" +
+		enum.DiffExtHeaderDissimilarity + "|" +
+		enum.DiffExtHeaderIndex +
+		") (.+)$")
+
+func ParseDiffFileExtendedHeader(line string) (string, string) {
+	groups := regExpDiffExtHeader.FindStringSubmatch(line)
+	if groups == nil {
+		return "", ""
+	}
+
+	return groups[1], groups[2]
+}
+
 // GetHunkHeaders parses git diff output and returns all diff headers for all files.
 // See for documentation: https://git-scm.com/docs/git-diff#generate_patch_text_with_p
 func GetHunkHeaders(r io.Reader) ([]*types.DiffFileHunkHeaders, error) {
@ -49,14 +75,20 @@ func GetHunkHeaders(r io.Reader) ([]*types.DiffFileHunkHeaders, error) {
 			continue
 		}

-		if h, ok := ParseDiffHunkHeader(line); ok {
 		if currentFile == nil {
 			// should not happen: we reached the hunk header without first finding the file header.
 			return nil, types.ErrHunkNotFound
 		}
+
+		if h, ok := ParseDiffHunkHeader(line); ok {
 			currentFile.HunksHeaders = append(currentFile.HunksHeaders, h)
 			continue
 		}
+
+		if headerKey, headerValue := ParseDiffFileExtendedHeader(line); headerKey != "" {
+			currentFile.FileHeader.Extensions[headerKey] = headerValue
+			continue
+		}
 	}

 	if err := scanner.Err(); err != nil {
--- a/gitrpc/internal/parser/diff_headers_test.go
+++ b/gitrpc/internal/parser/diff_headers_test.go
@ -8,6 +8,7 @@ import (
 	"strings"
 	"testing"

+	"github.com/harness/gitness/gitrpc/enum"
 	"github.com/harness/gitness/gitrpc/internal/types"

 	"github.com/google/go-cmp/cmp"
@ -20,9 +21,9 @@ index 0000000..fb0c863
 --- /dev/null
 +++ b/new_file.txt
@@ -0,0 +1,3 @@
-This is a new file
-created for this
-unit test.
+This is a new file
+created for this
+unit test.
 diff --git a/old_file_name.txt b/changed_file.txt
 index f043b93..e9449b5 100644
 --- a/changed_file.txt
@ -56,18 +57,38 @@ index f043b93..0000000

 	want := []*types.DiffFileHunkHeaders{
 		{
-			FileHeader:   types.DiffFileHeader{OldFileName: "new_file.txt", NewFileName: "new_file.txt"},
+			FileHeader: types.DiffFileHeader{
+				OldFileName: "new_file.txt",
+				NewFileName: "new_file.txt",
+				Extensions: map[string]string{
+					enum.DiffExtHeaderNewFileMode: "100644",
+					enum.DiffExtHeaderIndex:       "0000000..fb0c863",
+				},
+			},
 			HunksHeaders: []types.HunkHeader{{OldLine: 0, OldSpan: 0, NewLine: 1, NewSpan: 3}},
 		},
 		{
-			FileHeader: types.DiffFileHeader{OldFileName: "old_file_name.txt", NewFileName: "changed_file.txt"},
+			FileHeader: types.DiffFileHeader{
+				OldFileName: "old_file_name.txt",
+				NewFileName: "changed_file.txt",
+				Extensions: map[string]string{
+					enum.DiffExtHeaderIndex: "f043b93..e9449b5 100644",
+				},
+			},
 			HunksHeaders: []types.HunkHeader{
 				{OldLine: 7, OldSpan: 3, NewLine: 7, NewSpan: 4},
 				{OldLine: 27, OldSpan: 2, NewLine: 28, NewSpan: 3},
 			},
 		},
 		{
-			FileHeader:   types.DiffFileHeader{OldFileName: "deleted_file.txt", NewFileName: "deleted_file.txt"},
+			FileHeader: types.DiffFileHeader{
+				OldFileName: "deleted_file.txt",
+				NewFileName: "deleted_file.txt",
+				Extensions: map[string]string{
+					enum.DiffExtHeaderDeletedFileMode: "100644",
+					enum.DiffExtHeaderIndex:           "f043b93..0000000",
+				},
+			},
 			HunksHeaders: []types.HunkHeader{{OldLine: 1, OldSpan: 3, NewLine: 0, NewSpan: 0}},
 		},
 	}
--- a/gitrpc/internal/service/commit.go
+++ b/gitrpc/internal/service/commit.go
@ -134,3 +134,19 @@ func (s RepositoryService) GetCommitDivergences(ctx context.Context,

 	return response, nil
 }
+
+func (s RepositoryService) MergeBase(ctx context.Context,
+	r *rpc.MergeBaseRequest,
+) (*rpc.MergeBaseResponse, error) {
+	base := r.GetBase()
+	repoPath := getFullPathForRepo(s.reposRoot, base.GetRepoUid())
+
+	mergeBase, _, err := s.adapter.GetMergeBase(ctx, repoPath, "", r.Ref1, r.Ref2)
+	if err != nil {
+		return nil, processGitErrorf(err, "failed to find merge base")
+	}
+
+	return &rpc.MergeBaseResponse{
+		MergeBaseSha: mergeBase,
+	}, nil
+}
--- a/gitrpc/internal/service/diff.go
+++ b/gitrpc/internal/service/diff.go
@ -124,7 +124,7 @@ func (s DiffService) DiffCut(
 		return nil, processGitErrorf(err, "failed to find merge base")
 	}

-	sourceCommits, err := s.adapter.ListCommits(ctx, repoPath, r.SourceBranch, r.TargetBranch, 0, 1)
+	sourceCommits, err := s.adapter.ListCommitSHAs(ctx, repoPath, r.SourceBranch, r.TargetBranch, 0, 1)
 	if err != nil || len(sourceCommits) == 0 {
 		return nil, processGitErrorf(err, "failed to get list of source branch commits")
 	}
@ -146,6 +146,6 @@ func (s DiffService) DiffCut(
 		HunkHeader:      mapHunkHeader(hunk.HunkHeader),
 		Lines:           hunk.Lines,
 		MergeBaseSha:    mergeBase,
-		LatestSourceSha: sourceCommits[0].SHA,
+		LatestSourceSha: sourceCommits[0],
 	}, nil
 }
--- a/gitrpc/internal/service/interface.go
+++ b/gitrpc/internal/service/interface.go
@ -33,6 +33,8 @@ type GitAdapter interface {
 	GetCommits(ctx context.Context, repoPath string, refs []string) ([]types.Commit, error)
 	ListCommits(ctx context.Context, repoPath string,
 		ref string, afterRef string, page int, limit int) ([]types.Commit, error)
+	ListCommitSHAs(ctx context.Context, repoPath string,
+		ref string, afterRef string, page int, limit int) ([]string, error)
 	GetLatestCommit(ctx context.Context, repoPath string, ref string, treePath string) (*types.Commit, error)
 	GetFullCommitID(ctx context.Context, repoPath, shortID string) (string, error)
 	GetAnnotatedTag(ctx context.Context, repoPath string, sha string) (*types.Tag, error)
--- a/gitrpc/internal/service/mapping.go
+++ b/gitrpc/internal/service/mapping.go
@ -122,6 +122,7 @@ func mapDiffFileHeader(h types.DiffFileHeader) *rpc.DiffFileHeader {
 	return &rpc.DiffFileHeader{
 		OldFileName: h.OldFileName,
 		NewFileName: h.NewFileName,
+		Extensions:  h.Extensions,
 	}
 }

--- a/gitrpc/internal/types/types.go
+++ b/gitrpc/internal/types/types.go
@ -260,6 +260,7 @@ type DiffShortStat struct {
 type DiffFileHeader struct {
 	OldFileName string
 	NewFileName string
+	Extensions  map[string]string
 }

 type DiffFileHunkHeaders struct {
--- a/gitrpc/mapping.go
+++ b/gitrpc/mapping.go
@ -240,5 +240,6 @@ func mapDiffFileHeader(h *rpc.DiffFileHeader) DiffFileHeader {
 	return DiffFileHeader{
 		OldName:    h.OldFileName,
 		NewName:    h.NewFileName,
+		Extensions: h.Extensions,
 	}
 }
--- a/gitrpc/proto/diff.proto
+++ b/gitrpc/proto/diff.proto
@ -46,6 +46,7 @@ message HunkHeader {
 message DiffFileHeader {
  string old_file_name = 1;
  string new_file_name = 2;
+  map<string, string> extensions = 3;
 }

 message DiffFileHunkHeaders {
--- a/gitrpc/proto/repo.proto
+++ b/gitrpc/proto/repo.proto
@ -16,6 +16,7 @@ service RepositoryService {
  rpc GetCommit(GetCommitRequest) returns (GetCommitResponse);
  rpc GetCommitDivergences(GetCommitDivergencesRequest) returns (GetCommitDivergencesResponse);
  rpc DeleteRepository(DeleteRepositoryRequest) returns (DeleteRepositoryResponse);
+  rpc MergeBase(MergeBaseRequest) returns (MergeBaseResponse);
 }

 message CreateRepositoryRequest {
@ -164,3 +165,13 @@ message DeleteRepositoryRequest {

 message DeleteRepositoryResponse {
 }
+
+message MergeBaseRequest {
+  ReadRequest base = 1;
+  string ref1 = 2;
+  string ref2 = 3;
+}
+
+message MergeBaseResponse {
+  string merge_base_sha = 1;
+}
--- a/gitrpc/rpc/diff.pb.go
+++ b/gitrpc/rpc/diff.pb.go
@ -291,6 +291,7 @@ type DiffFileHeader struct {

 	OldFileName string            `protobuf:"bytes,1,opt,name=old_file_name,json=oldFileName,proto3" json:"old_file_name,omitempty"`
 	NewFileName string            `protobuf:"bytes,2,opt,name=new_file_name,json=newFileName,proto3" json:"new_file_name,omitempty"`
+	Extensions  map[string]string `protobuf:"bytes,3,rep,name=extensions,proto3" json:"extensions,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }

 func (x *DiffFileHeader) Reset() {
@ -339,6 +340,13 @@ func (x *DiffFileHeader) GetNewFileName() string {
 	return ""
 }

+func (x *DiffFileHeader) GetExtensions() map[string]string {
+	if x != nil {
+		return x.Extensions
+	}
+	return nil
+}
+
 type DiffFileHunkHeaders struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@ -725,90 +733,98 @@ var file_diff_proto_rawDesc = []byte{
 	0x01, 0x28, 0x05, 0x52, 0x07, 0x6e, 0x65, 0x77, 0x4c, 0x69, 0x6e, 0x65, 0x12, 0x19, 0x0a, 0x08,
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+	0x70, 0x63, 0x2f, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }

 var (
@ -823,7 +839,7 @@ func file_diff_proto_rawDescGZIP() []byte {
 	return file_diff_proto_rawDescData
 }

-var file_diff_proto_msgTypes = make([]protoimpl.MessageInfo, 10)
+var file_diff_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
 var file_diff_proto_goTypes = []interface{}{
 	(*DiffRequest)(nil),                // 0: rpc.DiffRequest
 	(*RawDiffResponse)(nil),            // 1: rpc.RawDiffResponse
@ -835,29 +851,31 @@ var file_diff_proto_goTypes = []interface{}{
 	(*GetDiffHunkHeadersResponse)(nil), // 7: rpc.GetDiffHunkHeadersResponse
 	(*DiffCutRequest)(nil),             // 8: rpc.DiffCutRequest
 	(*DiffCutResponse)(nil),            // 9: rpc.DiffCutResponse
-	(*ReadRequest)(nil),                // 10: rpc.ReadRequest
+	nil,                                // 10: rpc.DiffFileHeader.ExtensionsEntry
+	(*ReadRequest)(nil),                // 11: rpc.ReadRequest
 }
 var file_diff_proto_depIdxs = []int32{
-	10, // 0: rpc.DiffRequest.base:type_name -> rpc.ReadRequest
-	4,  // 1: rpc.DiffFileHunkHeaders.file_header:type_name -> rpc.DiffFileHeader
-	3,  // 2: rpc.DiffFileHunkHeaders.hunk_headers:type_name -> rpc.HunkHeader
-	10, // 3: rpc.GetDiffHunkHeadersRequest.base:type_name -> rpc.ReadRequest
-	5,  // 4: rpc.GetDiffHunkHeadersResponse.files:type_name -> rpc.DiffFileHunkHeaders
-	10, // 5: rpc.DiffCutRequest.base:type_name -> rpc.ReadRequest
-	3,  // 6: rpc.DiffCutResponse.hunk_header:type_name -> rpc.HunkHeader
-	0,  // 7: rpc.DiffService.RawDiff:input_type -> rpc.DiffRequest
-	0,  // 8: rpc.DiffService.DiffShortStat:input_type -> rpc.DiffRequest
-	6,  // 9: rpc.DiffService.GetDiffHunkHeaders:input_type -> rpc.GetDiffHunkHeadersRequest
-	8,  // 10: rpc.DiffService.DiffCut:input_type -> rpc.DiffCutRequest
-	1,  // 11: rpc.DiffService.RawDiff:output_type -> rpc.RawDiffResponse
-	2,  // 12: rpc.DiffService.DiffShortStat:output_type -> rpc.DiffShortStatResponse
-	7,  // 13: rpc.DiffService.GetDiffHunkHeaders:output_type -> rpc.GetDiffHunkHeadersResponse
-	9,  // 14: rpc.DiffService.DiffCut:output_type -> rpc.DiffCutResponse
-	11, // [11:15] is the sub-list for method output_type
-	7,  // [7:11] is the sub-list for method input_type
-	7,  // [7:7] is the sub-list for extension type_name
-	7,  // [7:7] is the sub-list for extension extendee
-	0,  // [0:7] is the sub-list for field type_name
+	11, // 0: rpc.DiffRequest.base:type_name -> rpc.ReadRequest
+	10, // 1: rpc.DiffFileHeader.extensions:type_name -> rpc.DiffFileHeader.ExtensionsEntry
+	4,  // 2: rpc.DiffFileHunkHeaders.file_header:type_name -> rpc.DiffFileHeader
+	3,  // 3: rpc.DiffFileHunkHeaders.hunk_headers:type_name -> rpc.HunkHeader
+	11, // 4: rpc.GetDiffHunkHeadersRequest.base:type_name -> rpc.ReadRequest
+	5,  // 5: rpc.GetDiffHunkHeadersResponse.files:type_name -> rpc.DiffFileHunkHeaders
+	11, // 6: rpc.DiffCutRequest.base:type_name -> rpc.ReadRequest
+	3,  // 7: rpc.DiffCutResponse.hunk_header:type_name -> rpc.HunkHeader
+	0,  // 8: rpc.DiffService.RawDiff:input_type -> rpc.DiffRequest
+	0,  // 9: rpc.DiffService.DiffShortStat:input_type -> rpc.DiffRequest
+	6,  // 10: rpc.DiffService.GetDiffHunkHeaders:input_type -> rpc.GetDiffHunkHeadersRequest
+	8,  // 11: rpc.DiffService.DiffCut:input_type -> rpc.DiffCutRequest
+	1,  // 12: rpc.DiffService.RawDiff:output_type -> rpc.RawDiffResponse
+	2,  // 13: rpc.DiffService.DiffShortStat:output_type -> rpc.DiffShortStatResponse
+	7,  // 14: rpc.DiffService.GetDiffHunkHeaders:output_type -> rpc.GetDiffHunkHeadersResponse
+	9,  // 15: rpc.DiffService.DiffCut:output_type -> rpc.DiffCutResponse
+	12, // [12:16] is the sub-list for method output_type
+	8,  // [8:12] is the sub-list for method input_type
+	8,  // [8:8] is the sub-list for extension type_name
+	8,  // [8:8] is the sub-list for extension extendee
+	0,  // [0:8] is the sub-list for field type_name
 }

 func init() { file_diff_proto_init() }
@ -994,7 +1012,7 @@ func file_diff_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_diff_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   10,
+			NumMessages:   11,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
--- a/gitrpc/rpc/http.pb.go
+++ b/gitrpc/rpc/http.pb.go
@ -151,6 +151,7 @@ type ServicePackRequest struct {
 	// Depending on the service the matching base type has to be passed
 	//
 	// Types that are assignable to Base:
+	//
 	//	*ServicePackRequest_ReadBase
 	//	*ServicePackRequest_WriteBase
 	Base isServicePackRequest_Base `protobuf_oneof:"base"`
--- a/gitrpc/rpc/operations.pb.go
+++ b/gitrpc/rpc/operations.pb.go
@ -247,6 +247,7 @@ type CommitFilesAction struct {
 	unknownFields protoimpl.UnknownFields

 	// Types that are assignable to Payload:
+	//
 	//	*CommitFilesAction_Header
 	//	*CommitFilesAction_Content
 	Payload isCommitFilesAction_Payload `protobuf_oneof:"payload"`
@ -330,6 +331,7 @@ type CommitFilesRequest struct {
 	unknownFields protoimpl.UnknownFields

 	// Types that are assignable to Payload:
+	//
 	//	*CommitFilesRequest_Header
 	//	*CommitFilesRequest_Action
 	Payload isCommitFilesRequest_Payload `protobuf_oneof:"payload"`
--- a/gitrpc/rpc/repo.pb.go
+++ b/gitrpc/rpc/repo.pb.go
@ -130,6 +130,7 @@ type CreateRepositoryRequest struct {
 	unknownFields protoimpl.UnknownFields

 	// Types that are assignable to Data:
+	//
 	//	*CreateRepositoryRequest_Header
 	//	*CreateRepositoryRequest_File
 	Data isCreateRepositoryRequest_Data `protobuf_oneof:"data"`
@ -949,6 +950,7 @@ type GetBlobResponse struct {
 	unknownFields protoimpl.UnknownFields

 	// Types that are assignable to Data:
+	//
 	//	*GetBlobResponse_Header
 	//	*GetBlobResponse_Content
 	Data isGetBlobResponse_Data `protobuf_oneof:"data"`
@ -1556,6 +1558,116 @@ func (*DeleteRepositoryResponse) Descriptor() ([]byte, []int) {
 	return file_repo_proto_rawDescGZIP(), []int{23}
 }

+type MergeBaseRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Base *ReadRequest `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
+	Ref1 string       `protobuf:"bytes,2,opt,name=ref1,proto3" json:"ref1,omitempty"`
+	Ref2 string       `protobuf:"bytes,3,opt,name=ref2,proto3" json:"ref2,omitempty"`
+}
+
+func (x *MergeBaseRequest) Reset() {
+	*x = MergeBaseRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_repo_proto_msgTypes[24]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MergeBaseRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MergeBaseRequest) ProtoMessage() {}
+
+func (x *MergeBaseRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_repo_proto_msgTypes[24]
+	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 MergeBaseRequest.ProtoReflect.Descriptor instead.
+func (*MergeBaseRequest) Descriptor() ([]byte, []int) {
+	return file_repo_proto_rawDescGZIP(), []int{24}
+}
+
+func (x *MergeBaseRequest) GetBase() *ReadRequest {
+	if x != nil {
+		return x.Base
+	}
+	return nil
+}
+
+func (x *MergeBaseRequest) GetRef1() string {
+	if x != nil {
+		return x.Ref1
+	}
+	return ""
+}
+
+func (x *MergeBaseRequest) GetRef2() string {
+	if x != nil {
+		return x.Ref2
+	}
+	return ""
+}
+
+type MergeBaseResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	MergeBaseSha string `protobuf:"bytes,1,opt,name=merge_base_sha,json=mergeBaseSha,proto3" json:"merge_base_sha,omitempty"`
+}
+
+func (x *MergeBaseResponse) Reset() {
+	*x = MergeBaseResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_repo_proto_msgTypes[25]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MergeBaseResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MergeBaseResponse) ProtoMessage() {}
+
+func (x *MergeBaseResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_repo_proto_msgTypes[25]
+	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 MergeBaseResponse.ProtoReflect.Descriptor instead.
+func (*MergeBaseResponse) Descriptor() ([]byte, []int) {
+	return file_repo_proto_rawDescGZIP(), []int{25}
+}
+
+func (x *MergeBaseResponse) GetMergeBaseSha() string {
+	if x != nil {
+		return x.MergeBaseSha
+	}
+	return ""
+}
+
 var File_repo_proto protoreflect.FileDescriptor

 var file_repo_proto_rawDesc = []byte{
@ -1711,65 +1823,79 @@ var file_repo_proto_rawDesc = []byte{
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+	0x73, 0x65, 0x42, 0x27, 0x5a, 0x25, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d,
+	0x2f, 0x68, 0x61, 0x72, 0x6e, 0x65, 0x73, 0x73, 0x2f, 0x67, 0x69, 0x74, 0x6e, 0x65, 0x73, 0x73,
+	0x2f, 0x67, 0x69, 0x74, 0x72, 0x70, 0x63, 0x2f, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
 }

 var (
@ -1785,7 +1911,7 @@ func file_repo_proto_rawDescGZIP() []byte {
 }

 var file_repo_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_repo_proto_msgTypes = make([]protoimpl.MessageInfo, 24)
+var file_repo_proto_msgTypes = make([]protoimpl.MessageInfo, 26)
 var file_repo_proto_goTypes = []interface{}{
 	(TreeNodeType)(0),                     // 0: rpc.TreeNodeType
 	(TreeNodeMode)(0),                     // 1: rpc.TreeNodeMode
@ -1813,61 +1939,66 @@ var file_repo_proto_goTypes = []interface{}{
 	(*CommitDivergence)(nil),              // 23: rpc.CommitDivergence
 	(*DeleteRepositoryRequest)(nil),       // 24: rpc.DeleteRepositoryRequest
 	(*DeleteRepositoryResponse)(nil),      // 25: rpc.DeleteRepositoryResponse
-	(*FileUpload)(nil),                    // 26: rpc.FileUpload
-	(*WriteRequest)(nil),                  // 27: rpc.WriteRequest
-	(*Identity)(nil),                      // 28: rpc.Identity
-	(*ReadRequest)(nil),                   // 29: rpc.ReadRequest
-	(*Commit)(nil),                        // 30: rpc.Commit
+	(*MergeBaseRequest)(nil),              // 26: rpc.MergeBaseRequest
+	(*MergeBaseResponse)(nil),             // 27: rpc.MergeBaseResponse
+	(*FileUpload)(nil),                    // 28: rpc.FileUpload
+	(*WriteRequest)(nil),                  // 29: rpc.WriteRequest
+	(*Identity)(nil),                      // 30: rpc.Identity
+	(*ReadRequest)(nil),                   // 31: rpc.ReadRequest
+	(*Commit)(nil),                        // 32: rpc.Commit
 }
 var file_repo_proto_depIdxs = []int32{
 	3,  // 0: rpc.CreateRepositoryRequest.header:type_name -> rpc.CreateRepositoryRequestHeader
-	26, // 1: rpc.CreateRepositoryRequest.file:type_name -> rpc.FileUpload
-	27, // 2: rpc.CreateRepositoryRequestHeader.base:type_name -> rpc.WriteRequest
-	28, // 3: rpc.CreateRepositoryRequestHeader.author:type_name -> rpc.Identity
-	28, // 4: rpc.CreateRepositoryRequestHeader.committer:type_name -> rpc.Identity
-	29, // 5: rpc.GetTreeNodeRequest.base:type_name -> rpc.ReadRequest
+	28, // 1: rpc.CreateRepositoryRequest.file:type_name -> rpc.FileUpload
+	29, // 2: rpc.CreateRepositoryRequestHeader.base:type_name -> rpc.WriteRequest
+	30, // 3: rpc.CreateRepositoryRequestHeader.author:type_name -> rpc.Identity
+	30, // 4: rpc.CreateRepositoryRequestHeader.committer:type_name -> rpc.Identity
+	31, // 5: rpc.GetTreeNodeRequest.base:type_name -> rpc.ReadRequest
 	9,  // 6: rpc.GetTreeNodeResponse.node:type_name -> rpc.TreeNode
-	30, // 7: rpc.GetTreeNodeResponse.commit:type_name -> rpc.Commit
-	29, // 8: rpc.ListTreeNodesRequest.base:type_name -> rpc.ReadRequest
+	32, // 7: rpc.GetTreeNodeResponse.commit:type_name -> rpc.Commit
+	31, // 8: rpc.ListTreeNodesRequest.base:type_name -> rpc.ReadRequest
 	9,  // 9: rpc.ListTreeNodesResponse.node:type_name -> rpc.TreeNode
-	30, // 10: rpc.ListTreeNodesResponse.commit:type_name -> rpc.Commit
+	32, // 10: rpc.ListTreeNodesResponse.commit:type_name -> rpc.Commit
 	0,  // 11: rpc.TreeNode.type:type_name -> rpc.TreeNodeType
 	1,  // 12: rpc.TreeNode.mode:type_name -> rpc.TreeNodeMode
-	29, // 13: rpc.GetCommitRequest.base:type_name -> rpc.ReadRequest
-	30, // 14: rpc.GetCommitResponse.commit:type_name -> rpc.Commit
-	29, // 15: rpc.ListCommitsRequest.base:type_name -> rpc.ReadRequest
-	30, // 16: rpc.ListCommitsResponse.commit:type_name -> rpc.Commit
-	29, // 17: rpc.GetBlobRequest.base:type_name -> rpc.ReadRequest
+	31, // 13: rpc.GetCommitRequest.base:type_name -> rpc.ReadRequest
+	32, // 14: rpc.GetCommitResponse.commit:type_name -> rpc.Commit
+	31, // 15: rpc.ListCommitsRequest.base:type_name -> rpc.ReadRequest
+	32, // 16: rpc.ListCommitsResponse.commit:type_name -> rpc.Commit
+	31, // 17: rpc.GetBlobRequest.base:type_name -> rpc.ReadRequest
 	16, // 18: rpc.GetBlobResponse.header:type_name -> rpc.GetBlobResponseHeader
-	29, // 19: rpc.GetSubmoduleRequest.base:type_name -> rpc.ReadRequest
+	31, // 19: rpc.GetSubmoduleRequest.base:type_name -> rpc.ReadRequest
 	19, // 20: rpc.GetSubmoduleResponse.submodule:type_name -> rpc.Submodule
-	29, // 21: rpc.GetCommitDivergencesRequest.base:type_name -> rpc.ReadRequest
+	31, // 21: rpc.GetCommitDivergencesRequest.base:type_name -> rpc.ReadRequest
 	21, // 22: rpc.GetCommitDivergencesRequest.requests:type_name -> rpc.CommitDivergenceRequest
 	23, // 23: rpc.GetCommitDivergencesResponse.divergences:type_name -> rpc.CommitDivergence
-	27, // 24: rpc.DeleteRepositoryRequest.base:type_name -> rpc.WriteRequest
-	2,  // 25: rpc.RepositoryService.CreateRepository:input_type -> rpc.CreateRepositoryRequest
-	5,  // 26: rpc.RepositoryService.GetTreeNode:input_type -> rpc.GetTreeNodeRequest
-	7,  // 27: rpc.RepositoryService.ListTreeNodes:input_type -> rpc.ListTreeNodesRequest
-	17, // 28: rpc.RepositoryService.GetSubmodule:input_type -> rpc.GetSubmoduleRequest
-	14, // 29: rpc.RepositoryService.GetBlob:input_type -> rpc.GetBlobRequest
-	12, // 30: rpc.RepositoryService.ListCommits:input_type -> rpc.ListCommitsRequest
-	10, // 31: rpc.RepositoryService.GetCommit:input_type -> rpc.GetCommitRequest
-	20, // 32: rpc.RepositoryService.GetCommitDivergences:input_type -> rpc.GetCommitDivergencesRequest
-	24, // 33: rpc.RepositoryService.DeleteRepository:input_type -> rpc.DeleteRepositoryRequest
-	4,  // 34: rpc.RepositoryService.CreateRepository:output_type -> rpc.CreateRepositoryResponse
-	6,  // 35: rpc.RepositoryService.GetTreeNode:output_type -> rpc.GetTreeNodeResponse
-	8,  // 36: rpc.RepositoryService.ListTreeNodes:output_type -> rpc.ListTreeNodesResponse
-	18, // 37: rpc.RepositoryService.GetSubmodule:output_type -> rpc.GetSubmoduleResponse
-	15, // 38: rpc.RepositoryService.GetBlob:output_type -> rpc.GetBlobResponse
-	13, // 39: rpc.RepositoryService.ListCommits:output_type -> rpc.ListCommitsResponse
-	11, // 40: rpc.RepositoryService.GetCommit:output_type -> rpc.GetCommitResponse
-	22, // 41: rpc.RepositoryService.GetCommitDivergences:output_type -> rpc.GetCommitDivergencesResponse
-	25, // 42: rpc.RepositoryService.DeleteRepository:output_type -> rpc.DeleteRepositoryResponse
-	34, // [34:43] is the sub-list for method output_type
-	25, // [25:34] is the sub-list for method input_type
-	25, // [25:25] is the sub-list for extension type_name
-	25, // [25:25] is the sub-list for extension extendee
-	0,  // [0:25] is the sub-list for field type_name
+	29, // 24: rpc.DeleteRepositoryRequest.base:type_name -> rpc.WriteRequest
+	31, // 25: rpc.MergeBaseRequest.base:type_name -> rpc.ReadRequest
+	2,  // 26: rpc.RepositoryService.CreateRepository:input_type -> rpc.CreateRepositoryRequest
+	5,  // 27: rpc.RepositoryService.GetTreeNode:input_type -> rpc.GetTreeNodeRequest
+	7,  // 28: rpc.RepositoryService.ListTreeNodes:input_type -> rpc.ListTreeNodesRequest
+	17, // 29: rpc.RepositoryService.GetSubmodule:input_type -> rpc.GetSubmoduleRequest
+	14, // 30: rpc.RepositoryService.GetBlob:input_type -> rpc.GetBlobRequest
+	12, // 31: rpc.RepositoryService.ListCommits:input_type -> rpc.ListCommitsRequest
+	10, // 32: rpc.RepositoryService.GetCommit:input_type -> rpc.GetCommitRequest
+	20, // 33: rpc.RepositoryService.GetCommitDivergences:input_type -> rpc.GetCommitDivergencesRequest
+	24, // 34: rpc.RepositoryService.DeleteRepository:input_type -> rpc.DeleteRepositoryRequest
+	26, // 35: rpc.RepositoryService.MergeBase:input_type -> rpc.MergeBaseRequest
+	4,  // 36: rpc.RepositoryService.CreateRepository:output_type -> rpc.CreateRepositoryResponse
+	6,  // 37: rpc.RepositoryService.GetTreeNode:output_type -> rpc.GetTreeNodeResponse
+	8,  // 38: rpc.RepositoryService.ListTreeNodes:output_type -> rpc.ListTreeNodesResponse
+	18, // 39: rpc.RepositoryService.GetSubmodule:output_type -> rpc.GetSubmoduleResponse
+	15, // 40: rpc.RepositoryService.GetBlob:output_type -> rpc.GetBlobResponse
+	13, // 41: rpc.RepositoryService.ListCommits:output_type -> rpc.ListCommitsResponse
+	11, // 42: rpc.RepositoryService.GetCommit:output_type -> rpc.GetCommitResponse
+	22, // 43: rpc.RepositoryService.GetCommitDivergences:output_type -> rpc.GetCommitDivergencesResponse
+	25, // 44: rpc.RepositoryService.DeleteRepository:output_type -> rpc.DeleteRepositoryResponse
+	27, // 45: rpc.RepositoryService.MergeBase:output_type -> rpc.MergeBaseResponse
+	36, // [36:46] is the sub-list for method output_type
+	26, // [26:36] is the sub-list for method input_type
+	26, // [26:26] is the sub-list for extension type_name
+	26, // [26:26] is the sub-list for extension extendee
+	0,  // [0:26] is the sub-list for field type_name
 }

 func init() { file_repo_proto_init() }
@ -2165,6 +2296,30 @@ func file_repo_proto_init() {
 				return nil
 			}
 		}
+		file_repo_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MergeBaseRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_repo_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MergeBaseResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_repo_proto_msgTypes[0].OneofWrappers = []interface{}{
 		(*CreateRepositoryRequest_Header)(nil),
@ -2180,7 +2335,7 @@ func file_repo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_repo_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   24,
+			NumMessages:   26,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
--- a/gitrpc/rpc/repo_grpc.pb.go
+++ b/gitrpc/rpc/repo_grpc.pb.go
@ -31,6 +31,7 @@ type RepositoryServiceClient interface {
 	GetCommit(ctx context.Context, in *GetCommitRequest, opts ...grpc.CallOption) (*GetCommitResponse, error)
 	GetCommitDivergences(ctx context.Context, in *GetCommitDivergencesRequest, opts ...grpc.CallOption) (*GetCommitDivergencesResponse, error)
 	DeleteRepository(ctx context.Context, in *DeleteRepositoryRequest, opts ...grpc.CallOption) (*DeleteRepositoryResponse, error)
+	MergeBase(ctx context.Context, in *MergeBaseRequest, opts ...grpc.CallOption) (*MergeBaseResponse, error)
 }

 type repositoryServiceClient struct {
@ -216,6 +217,15 @@ func (c *repositoryServiceClient) DeleteRepository(ctx context.Context, in *Dele
 	return out, nil
 }

+func (c *repositoryServiceClient) MergeBase(ctx context.Context, in *MergeBaseRequest, opts ...grpc.CallOption) (*MergeBaseResponse, error) {
+	out := new(MergeBaseResponse)
+	err := c.cc.Invoke(ctx, "/rpc.RepositoryService/MergeBase", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // RepositoryServiceServer is the server API for RepositoryService service.
 // All implementations must embed UnimplementedRepositoryServiceServer
 // for forward compatibility
@ -229,6 +239,7 @@ type RepositoryServiceServer interface {
 	GetCommit(context.Context, *GetCommitRequest) (*GetCommitResponse, error)
 	GetCommitDivergences(context.Context, *GetCommitDivergencesRequest) (*GetCommitDivergencesResponse, error)
 	DeleteRepository(context.Context, *DeleteRepositoryRequest) (*DeleteRepositoryResponse, error)
+	MergeBase(context.Context, *MergeBaseRequest) (*MergeBaseResponse, error)
 	mustEmbedUnimplementedRepositoryServiceServer()
 }

@ -263,6 +274,9 @@ func (UnimplementedRepositoryServiceServer) GetCommitDivergences(context.Context
 func (UnimplementedRepositoryServiceServer) DeleteRepository(context.Context, *DeleteRepositoryRequest) (*DeleteRepositoryResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method DeleteRepository not implemented")
 }
+func (UnimplementedRepositoryServiceServer) MergeBase(context.Context, *MergeBaseRequest) (*MergeBaseResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method MergeBase not implemented")
+}
 func (UnimplementedRepositoryServiceServer) mustEmbedUnimplementedRepositoryServiceServer() {}

 // UnsafeRepositoryServiceServer may be embedded to opt out of forward compatibility for this service.
@ -455,6 +469,24 @@ func _RepositoryService_DeleteRepository_Handler(srv interface{}, ctx context.Co
 	return interceptor(ctx, in, info, handler)
 }

+func _RepositoryService_MergeBase_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(MergeBaseRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RepositoryServiceServer).MergeBase(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/rpc.RepositoryService/MergeBase",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RepositoryServiceServer).MergeBase(ctx, req.(*MergeBaseRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // RepositoryService_ServiceDesc is the grpc.ServiceDesc for RepositoryService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@ -482,6 +514,10 @@ var RepositoryService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "DeleteRepository",
 			Handler:    _RepositoryService_DeleteRepository_Handler,
 		},
+		{
+			MethodName: "MergeBase",
+			Handler:    _RepositoryService_MergeBase_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
--- a/gitrpc/rpc/shared.pb.go
+++ b/gitrpc/rpc/shared.pb.go
@ -298,6 +298,7 @@ type FileUpload struct {
 	unknownFields protoimpl.UnknownFields

 	// Types that are assignable to Data:
+	//
 	//	*FileUpload_Header
 	//	*FileUpload_Chunk
 	Data isFileUpload_Data `protobuf_oneof:"data"`
--- a/internal/api/controller/pullreq/comment_create.go
+++ b/internal/api/controller/pullreq/comment_create.go
@ -129,7 +129,7 @@ func (c *Controller) CommentCreate(

 		// Migrate the comment if necessary... Note: we still need to return the code comment as is.
 		needsNewLineMigrate := in.SourceCommitSHA != cut.LatestSourceSHA
-		needsOldLineMigrate := pr.MergeBaseSHA != nil && *pr.MergeBaseSHA != cut.MergeBaseSHA
+		needsOldLineMigrate := pr.MergeBaseSHA != cut.MergeBaseSHA
 		if err == nil && (needsNewLineMigrate || needsOldLineMigrate) {
 			comments := []*types.CodeComment{act.AsCodeComment()}

--- a/internal/api/controller/pullreq/merge.go
+++ b/internal/api/controller/pullreq/merge.go
@ -133,7 +133,7 @@ func (c *Controller) Merge(
 		// update all Merge specific information (might be empty if previous merge check failed)
 		pr.MergeCheckStatus = enum.MergeCheckStatusMergeable
 		pr.MergeTargetSHA = &mergeOutput.BaseSHA
-		pr.MergeBaseSHA = &mergeOutput.MergeBaseSHA
+		pr.MergeBaseSHA = mergeOutput.MergeBaseSHA
 		pr.MergeSHA = &mergeOutput.MergeSHA
 		pr.MergeConflicts = nil

--- a/internal/api/controller/pullreq/pr_commits.go
+++ b/internal/api/controller/pullreq/pr_commits.go
@ -33,14 +33,8 @@ func (c *Controller) Commits(
 		return nil, fmt.Errorf("failed to get pull request by number: %w", err)
 	}

-	gitRef := pr.SourceBranch
-	if pr.SourceSHA != "" {
-		gitRef = pr.SourceSHA
-	}
-	afterRef := pr.TargetBranch
-	if pr.MergeBaseSHA != nil {
-		afterRef = *pr.MergeBaseSHA
-	}
+	gitRef := pr.SourceSHA
+	afterRef := pr.MergeBaseSHA

 	rpcOut, err := c.gitRPCClient.ListCommits(ctx, &gitrpc.ListCommitsParams{
 		ReadParams: gitrpc.CreateRPCReadParams(repo),
--- a/internal/api/controller/pullreq/pr_create.go
+++ b/internal/api/controller/pullreq/pr_create.go
@ -10,6 +10,7 @@ import (
 	"strings"
 	"time"

+	"github.com/harness/gitness/gitrpc"
 	"github.com/harness/gitness/internal/api/usererror"
 	"github.com/harness/gitness/internal/auth"
 	pullreqevents "github.com/harness/gitness/internal/events/pullreq"
@ -71,6 +72,17 @@ func (c *Controller) Create(
 		return nil, err
 	}

+	mergeBaseResult, err := c.gitRPCClient.MergeBase(ctx, gitrpc.MergeBaseParams{
+		ReadParams: gitrpc.ReadParams{RepoUID: sourceRepo.GitUID},
+		Ref1:       in.SourceBranch,
+		Ref2:       in.TargetBranch,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("failed to find merge base: %w", err)
+	}
+
+	mergeBaseSHA := mergeBaseResult.MergeBaseSHA
+
 	targetRepo, err = c.repoStore.UpdateOptLock(ctx, targetRepo, func(repo *types.Repository) error {
 		repo.PullReqSeq++
 		return nil
@ -79,7 +91,7 @@ func (c *Controller) Create(
 		return nil, fmt.Errorf("failed to aquire PullReqSeq number: %w", err)
 	}

-	pr := newPullReq(session, targetRepo.PullReqSeq, sourceRepo, targetRepo, in, sourceSHA)
+	pr := newPullReq(session, targetRepo.PullReqSeq, sourceRepo, targetRepo, in, sourceSHA, mergeBaseSHA)

 	err = c.pullreqStore.Create(ctx, pr)
 	if err != nil {
@ -103,7 +115,7 @@ func newPullReq(
 	sourceRepo *types.Repository,
 	targetRepo *types.Repository,
 	in *CreateInput,
-	sourceSHA string,
+	sourceSHA, mergeBaseSHA string,
 ) *types.PullReq {
 	now := time.Now().UnixMilli()
 	return &types.PullReq{
@ -128,6 +140,7 @@ func newPullReq(
 		Merged:           nil,
 		MergeCheckStatus: enum.MergeCheckStatusUnchecked,
 		MergeMethod:      nil,
+		MergeBaseSHA:     mergeBaseSHA,
 		Author:           *session.Principal.ToPrincipalInfo(),
 		Merger:           nil,
 	}
--- a/internal/api/controller/pullreq/pr_diff.go
+++ b/internal/api/controller/pullreq/pr_diff.go
@ -32,14 +32,8 @@ func (c *Controller) RawDiff(
 		return fmt.Errorf("failed to get pull request by number: %w", err)
 	}

-	headRef := pr.SourceBranch
-	if pr.SourceSHA != "" {
-		headRef = pr.SourceSHA
-	}
-	baseRef := pr.TargetBranch
-	if pr.MergeBaseSHA != nil {
-		baseRef = *pr.MergeBaseSHA
-	}
+	headRef := pr.SourceSHA
+	baseRef := pr.MergeBaseSHA

 	return c.gitRPCClient.RawDiff(ctx, &gitrpc.DiffParams{
 		ReadParams: gitrpc.CreateRPCReadParams(repo),
--- a/internal/api/controller/pullreq/pr_find.go
+++ b/internal/api/controller/pullreq/pr_find.go
@ -36,14 +36,8 @@ func (c *Controller) Find(
 		return nil, err
 	}

-	headRef := pr.SourceBranch
-	if pr.SourceSHA != "" {
-		headRef = pr.SourceSHA
-	}
-	baseRef := pr.TargetBranch
-	if pr.MergeBaseSHA != nil {
-		baseRef = *pr.MergeBaseSHA
-	}
+	headRef := pr.SourceSHA
+	baseRef := pr.MergeBaseSHA

 	output, err := c.gitRPCClient.DiffStats(ctx, &gitrpc.DiffParams{
 		ReadParams: gitrpc.CreateRPCReadParams(repo),
--- a/internal/events/pullreq/events_branch.go
+++ b/internal/events/pullreq/events_branch.go
@ -18,6 +18,8 @@ type BranchUpdatedPayload struct {
 	Base
 	OldSHA          string `json:"old_sha"`
 	NewSHA          string `json:"new_sha"`
+	OldMergeBaseSHA string `json:"old_merge_base_sha"`
+	NewMergeBaseSHA string `json:"new_merge_base_sha"`
 	Forced          bool   `json:"forced"`
 }

--- a/internal/services/codecomments/migrator.go
+++ b/internal/services/codecomments/migrator.go
@ -8,6 +8,7 @@ import (
 	"context"

 	"github.com/harness/gitness/gitrpc"
+	gitrpcenum "github.com/harness/gitness/gitrpc/enum"
 	"github.com/harness/gitness/types"

 	"github.com/rs/zerolog/log"
@ -75,7 +76,7 @@ func (migrator *Migrator) MigrateOld(
 	)
 }

-//nolint:gocognit // refactor if needed
+//nolint:gocognit,funlen // refactor if needed
 func (migrator *Migrator) migrate(
 	ctx context.Context,
 	repoGitUID string,
@ -136,7 +137,15 @@ func (migrator *Migrator) migrate(
 			}

 			// Handle file delete
-			if len(file.HunkHeaders) == 1 && file.HunkHeaders[0].NewLine == 0 && file.HunkHeaders[0].NewSpan == 0 {
+			if _, isDeleted := file.FileHeader.Extensions[gitrpcenum.DiffExtHeaderDeletedFileMode]; isDeleted {
+				for _, codeComment := range codeComments {
+					codeComment.Outdated = true
+				}
+				continue
+			}
+
+			// Handle new files - shouldn't happen because code comments should exist for a non-existing file.
+			if _, isAdded := file.FileHeader.Extensions[gitrpcenum.DiffExtHeaderNewFileMode]; isAdded {
 				for _, codeComment := range codeComments {
 					codeComment.Outdated = true
 				}
--- a/internal/services/pullreq/handlers_branch.go
+++ b/internal/services/pullreq/handlers_branch.go
@ -10,6 +10,7 @@ import (
 	"strings"

 	"github.com/harness/gitness/events"
+	"github.com/harness/gitness/gitrpc"
 	gitevents "github.com/harness/gitness/internal/events/git"
 	pullreqevents "github.com/harness/gitness/internal/events/pullreq"
 	"github.com/harness/gitness/types"
@ -23,8 +24,33 @@ import (
 func (s *Service) triggerPREventOnBranchUpdate(ctx context.Context,
 	event *events.Event[*gitevents.BranchUpdatedPayload],
 ) error {
+	// TODO: This function is currently executed directly on branch update event.
+	// TODO: But it should be executed after the PR's head ref has been updated.
+	// TODO: This is to make sure the commit exists on the target repository for forked repositories.
 	s.forEveryOpenPR(ctx, event.Payload.RepoID, event.Payload.Ref, func(pr *types.PullReq) error {
-		pr, err := s.pullreqStore.UpdateOptLock(ctx, pr, func(pr *types.PullReq) error {
+		// First check if the merge base has changed
+
+		targetRepoGit, err := s.repoGitInfoCache.Get(ctx, pr.TargetRepoID)
+		if err != nil {
+			return fmt.Errorf("failed to get repo git info: %w", err)
+		}
+
+		mergeBaseInfo, err := s.gitRPCClient.MergeBase(ctx, gitrpc.MergeBaseParams{
+			ReadParams: gitrpc.ReadParams{RepoUID: targetRepoGit.GitUID},
+			Ref1:       event.Payload.NewSHA,
+			Ref2:       pr.TargetBranch,
+		})
+		if err != nil {
+			return fmt.Errorf("failed to get merge base after branch update to=%s for PR=%d: %w",
+				event.Payload.NewSHA, pr.Number, err)
+		}
+
+		oldMergeBase := pr.MergeBaseSHA
+		newMergeBase := mergeBaseInfo.MergeBaseSHA
+
+		// Update the database with the latest source commit SHA and the merge base SHA.
+
+		pr, err = s.pullreqStore.UpdateOptLock(ctx, pr, func(pr *types.PullReq) error {
 			pr.ActivitySeq++
 			if pr.SourceSHA != event.Payload.OldSHA {
 				return fmt.Errorf(
@ -33,6 +59,7 @@ func (s *Service) triggerPREventOnBranchUpdate(ctx context.Context,
 			}

 			pr.SourceSHA = event.Payload.NewSHA
+			pr.MergeBaseSHA = newMergeBase

 			// reset merge-check fields for new run
 			pr.MergeCheckStatus = enum.MergeCheckStatusUnchecked
@ -65,6 +92,8 @@ func (s *Service) triggerPREventOnBranchUpdate(ctx context.Context,
 			},
 			OldSHA:          event.Payload.OldSHA,
 			NewSHA:          event.Payload.NewSHA,
+			OldMergeBaseSHA: oldMergeBase,
+			NewMergeBaseSHA: newMergeBase,
 			Forced:          event.Payload.Forced,
 		})
 		return nil
--- a/internal/services/pullreq/handlers_code_comments.go
+++ b/internal/services/pullreq/handlers_code_comments.go
@ -11,27 +11,35 @@ import (
 	"github.com/harness/gitness/events"
 	pullreqevents "github.com/harness/gitness/internal/events/pullreq"
 	"github.com/harness/gitness/types"
-
-	"github.com/rs/zerolog/log"
 )

 func (s *Service) updateCodeCommentsOnBranchUpdate(ctx context.Context,
 	event *events.Event[*pullreqevents.BranchUpdatedPayload],
 ) error {
-	oldSourceSHA := event.Payload.OldSHA // NOTE: we're ignoring the old value and instead try to update all
-	newSourceSHA := event.Payload.NewSHA
-
-	log.Ctx(ctx).Debug().
-		Str("oldSHA", oldSourceSHA).
-		Str("newSHA", newSourceSHA).
-		Msgf("code comment update after source branch update")
-
-	repoGit, err := s.repoGitInfoCache.Get(ctx, event.Payload.SourceRepoID)
+	repoGit, err := s.repoGitInfoCache.Get(ctx, event.Payload.TargetRepoID)
 	if err != nil {
 		return fmt.Errorf("failed to get repo git info: %w", err)
 	}

-	codeComments, err := s.codeCommentView.ListNotAtSourceSHA(ctx, event.Payload.PullReqID, newSourceSHA)
+	var codeComments []*types.CodeComment
+
+	newMergeBaseSHA := event.Payload.NewMergeBaseSHA
+
+	codeComments, err = s.codeCommentView.ListNotAtMergeBaseSHA(ctx, event.Payload.PullReqID, newMergeBaseSHA)
+	if err != nil {
+		return fmt.Errorf("failed to get list of code comments for update after merge base update: %w", err)
+	}
+
+	s.codeCommentMigrator.MigrateOld(ctx, repoGit.GitUID, newMergeBaseSHA, codeComments)
+
+	err = s.codeCommentView.UpdateAll(ctx, codeComments)
+	if err != nil {
+		return fmt.Errorf("failed to update code comments after merge base update: %w", err)
+	}
+
+	newSourceSHA := event.Payload.NewSHA
+
+	codeComments, err = s.codeCommentView.ListNotAtSourceSHA(ctx, event.Payload.PullReqID, newSourceSHA)
 	if err != nil {
 		return fmt.Errorf("failed to get list of code comments for update after source branch update: %w", err)
 	}
@ -45,28 +53,3 @@ func (s *Service) updateCodeCommentsOnBranchUpdate(ctx context.Context,

 	return nil
 }
-
-func (s *Service) updateCodeCommentsOnMergeBaseUpdate(ctx context.Context,
-	pr *types.PullReq,
-	gitUID string,
-	oldMergeBaseSHA, newMergeBaseSHA string,
-) error {
-	log.Ctx(ctx).Debug().
-		Str("oldSHA", oldMergeBaseSHA).
-		Str("newSHA", newMergeBaseSHA).
-		Msgf("code comment update after merge base update")
-
-	codeComments, err := s.codeCommentView.ListNotAtMergeBaseSHA(ctx, pr.ID, newMergeBaseSHA)
-	if err != nil {
-		return fmt.Errorf("failed to get list of code comments for update after merge base update: %w", err)
-	}
-
-	s.codeCommentMigrator.MigrateOld(ctx, gitUID, newMergeBaseSHA, codeComments)
-
-	err = s.codeCommentView.UpdateAll(ctx, codeComments)
-	if err != nil {
-		return fmt.Errorf("failed to update code comments after merge base update: %w", err)
-	}
-
-	return nil
-}
--- a/internal/services/pullreq/handlers_mergeable.go
+++ b/internal/services/pullreq/handlers_mergeable.go
@ -122,7 +122,7 @@ func (s *Service) deleteMergeRef(ctx context.Context, principalID int64, repoID
 	return nil
 }

-//nolint:funlen,gocognit // refactor if required.
+//nolint:funlen // refactor if required.
 func (s *Service) updateMergeData(
 	ctx context.Context,
 	principalID int64,
@ -131,6 +131,10 @@ func (s *Service) updateMergeData(
 	oldSHA string,
 	newSHA string,
 ) error {
+	// TODO: Merge check should not update the merge base.
+	// TODO: Instead it should accept it as an argument and fail if it doesn't match.
+	// Then is would not longer be necessary to cancel already active mergeability checks.
+
 	pr, err := s.pullreqStore.FindByNumber(ctx, repoID, prNum)
 	if err != nil {
 		return fmt.Errorf("failed to get pull request number %d: %w", prNum, err)
@ -227,13 +231,12 @@ func (s *Service) updateMergeData(
 			// TODO: gitrpc should return sha's either way, and also conflicting files!
 			pr.MergeCheckStatus = enum.MergeCheckStatusConflict
 			pr.MergeTargetSHA = &output.BaseSHA
-			pr.MergeBaseSHA = &output.MergeBaseSHA
 			pr.MergeSHA = nil
 			pr.MergeConflicts = nil
 		} else {
 			pr.MergeCheckStatus = enum.MergeCheckStatusMergeable
 			pr.MergeTargetSHA = &output.BaseSHA
-			pr.MergeBaseSHA = &output.MergeBaseSHA
+			pr.MergeBaseSHA = output.MergeBaseSHA // TODO: Merge check should not update the merge base.
 			pr.MergeSHA = &output.MergeSHA
 			pr.MergeConflicts = nil
 		}
@ -243,14 +246,5 @@ func (s *Service) updateMergeData(
 		return fmt.Errorf("failed to update PR merge ref in db with error: %w", err)
 	}

-	if pr.MergeBaseSHA != nil && *pr.MergeBaseSHA != output.MergeBaseSHA {
-		oldMergeBaseSHA := *pr.MergeBaseSHA
-		newMergeBaseSHA := output.MergeBaseSHA
-		err = s.updateCodeCommentsOnMergeBaseUpdate(ctx, pr, sourceRepo.GitUID, oldMergeBaseSHA, newMergeBaseSHA)
-		if err != nil {
-			return fmt.Errorf("failed to update code comment after merge base SHA change: %w", err)
-		}
-	}
-
 	return nil
 }
--- a/internal/store/database/code_comment.go
+++ b/internal/store/database/code_comment.go
@ -103,6 +103,10 @@ func (s *CodeCommentView) list(ctx context.Context,

 // UpdateAll updates all code comments provided in the slice.
 func (s *CodeCommentView) UpdateAll(ctx context.Context, codeComments []*types.CodeComment) error {
+	if len(codeComments) == 0 {
+		return nil
+	}
+
 	const sqlQuery = `
 	UPDATE pullreq_activities
 	SET
--- a/internal/store/database/migrate/postgres/0015_alter_pullreq_merge_base_not_nullable.down.sql
+++ b/internal/store/database/migrate/postgres/0015_alter_pullreq_merge_base_not_nullable.down.sql
@ -0,0 +1,4 @@
+ALTER TABLE pullreqs
+    ALTER COLUMN pullreq_merge_base_sha DROP DEFAULT,
+    ALTER COLUMN pullreq_merge_base_sha DROP NOT NULL;
+UPDATE pullreqs SET pullreq_merge_base_sha = NULL WHERE pullreq_merge_base_sha = '';
--- a/internal/store/database/migrate/postgres/0015_alter_pullreq_merge_base_not_nullable.up.sql
+++ b/internal/store/database/migrate/postgres/0015_alter_pullreq_merge_base_not_nullable.up.sql
@ -0,0 +1,4 @@
+UPDATE pullreqs SET pullreq_merge_base_sha = '' WHERE pullreq_merge_base_sha IS NULL;
+ALTER TABLE pullreqs
+    ALTER COLUMN pullreq_merge_base_sha SET DEFAULT '',
+    ALTER COLUMN pullreq_merge_base_sha SET NOT NULL;
--- a/internal/store/database/migrate/sqlite/0015_alter_pullreq_merge_base_not_nullable.down.sql
+++ b/internal/store/database/migrate/sqlite/0015_alter_pullreq_merge_base_not_nullable.down.sql
@ -0,0 +1,4 @@
+ALTER TABLE pullreqs ADD COLUMN pullreq_merge_base_sha_nullable TEXT;
+UPDATE pullreqs SET pullreq_merge_base_sha_nullable = pullreq_merge_base_sha WHERE pullreq_merge_base_sha <> '';
+ALTER TABLE pullreqs DROP COLUMN pullreq_merge_base_sha;
+ALTER TABLE pullreqs RENAME COLUMN pullreq_merge_base_sha_nullable TO pullreq_merge_base_sha;
--- a/internal/store/database/migrate/sqlite/0015_alter_pullreq_merge_base_not_nullable.up.sql
+++ b/internal/store/database/migrate/sqlite/0015_alter_pullreq_merge_base_not_nullable.up.sql
@ -0,0 +1,4 @@
+ALTER TABLE pullreqs ADD COLUMN pullreq_merge_base_sha_not_nullable TEXT NOT NULL DEFAULT '';
+UPDATE pullreqs SET pullreq_merge_base_sha_not_nullable = pullreq_merge_base_sha WHERE pullreq_merge_base_sha IS NOT NULL;
+ALTER TABLE pullreqs DROP COLUMN pullreq_merge_base_sha;
+ALTER TABLE pullreqs RENAME COLUMN pullreq_merge_base_sha_not_nullable TO pullreq_merge_base_sha;
--- a/internal/store/database/pullreq.go
+++ b/internal/store/database/pullreq.go
@ -73,7 +73,7 @@ type pullReq struct {

 	MergeCheckStatus enum.MergeCheckStatus `db:"pullreq_merge_check_status"`
 	MergeTargetSHA   null.String           `db:"pullreq_merge_target_sha"`
-	MergeBaseSHA     null.String           `db:"pullreq_merge_base_sha"`
+	MergeBaseSHA     string                `db:"pullreq_merge_base_sha"`
 	MergeSHA         null.String           `db:"pullreq_merge_sha"`
 	MergeConflicts   null.String           `db:"pullreq_merge_conflicts"`
 }
@ -481,7 +481,7 @@ func mapPullReq(pr *pullReq) *types.PullReq {
 		MergeMethod:      (*enum.MergeMethod)(pr.MergeMethod.Ptr()),
 		MergeCheckStatus: pr.MergeCheckStatus,
 		MergeTargetSHA:   pr.MergeTargetSHA.Ptr(),
-		MergeBaseSHA:     pr.MergeBaseSHA.Ptr(),
+		MergeBaseSHA:     pr.MergeBaseSHA,
 		MergeSHA:         pr.MergeSHA.Ptr(),
 		MergeConflicts:   pr.MergeConflicts.Ptr(),
 		Author:           types.PrincipalInfo{},
@ -521,7 +521,7 @@ func mapInternalPullReq(pr *types.PullReq) *pullReq {
 		MergeMethod:      null.StringFromPtr((*string)(pr.MergeMethod)),
 		MergeCheckStatus: pr.MergeCheckStatus,
 		MergeTargetSHA:   null.StringFromPtr(pr.MergeTargetSHA),
-		MergeBaseSHA:     null.StringFromPtr(pr.MergeBaseSHA),
+		MergeBaseSHA:     pr.MergeBaseSHA,
 		MergeSHA:         null.StringFromPtr(pr.MergeSHA),
 		MergeConflicts:   null.StringFromPtr(pr.MergeConflicts),
 	}
--- a/types/pullreq.go
+++ b/types/pullreq.go
@ -41,7 +41,7 @@ type PullReq struct {

 	MergeCheckStatus enum.MergeCheckStatus `json:"merge_check_status"`
 	MergeTargetSHA   *string               `json:"merge_target_sha"`
-	MergeBaseSHA     *string               `json:"merge_base_sha"`
+	MergeBaseSHA     string                `json:"merge_base_sha"`
 	MergeSHA         *string               `json:"merge_sha"`
 	MergeConflicts   *string               `json:"merge_conflicts,omitempty"`