ListConflictFiles: Allow tree conflicts when specified

In https://gitlab.com/gitlab-org/gitlab/-/issues/281171, we want
to display what type of conflict occurred for a specific file.
There are cases that there will be a missing side (e.g. tree-based
conflicts like renames) and currently ListConflictFiles RPC only
allows returning of conflicts when there is no missing side.

This MR changes ListConflictFiles to accept an AllowTreeConflicts
param which will then be set to true on gitlab-rails when we want
to get the list of conflicts.

Changelog: changed

5 files changed, 213 insertions, 101 deletions

diff --git a/internal/gitaly/service/conflicts/list_conflict_files.go b/internal/gitaly/service/conflicts/list_conflict_files.go
index 34874e51b..fa6c4c97e 100644
--- a/internal/gitaly/service/conflicts/list_conflict_files.go
+++ b/internal/gitaly/service/conflicts/list_conflict_files.go
@@ -54,7 +54,7 @@ func (s *server) ListConflictFiles(request *gitalypb.ListConflictFilesRequest, s
 	msgSize := 0
 
 	for _, conflict := range conflicts.Conflicts {
-		if conflict.Their.Path == "" || conflict.Our.Path == "" {
+		if !request.AllowTreeConflicts && (conflict.Their.Path == "" || conflict.Our.Path == "") {
 			return helper.ErrPreconditionFailedf("conflict side missing")
 		}
 
diff --git a/internal/gitaly/service/conflicts/list_conflict_files_test.go b/internal/gitaly/service/conflicts/list_conflict_files_test.go
index 3c6efe593..509305c57 100644
--- a/internal/gitaly/service/conflicts/list_conflict_files_test.go
+++ b/internal/gitaly/service/conflicts/list_conflict_files_test.go
@@ -20,8 +20,8 @@ import (
 )
 
 type conflictFile struct {
-	header  *gitalypb.ConflictFileHeader
-	content []byte
+	Header  *gitalypb.ConflictFileHeader
+	Content []byte
 }
 
 func TestSuccessfulListConflictFilesRequest(t *testing.T) {
@@ -63,22 +63,22 @@ end
 
 	expectedFiles := []*conflictFile{
 		{
-			header: &gitalypb.ConflictFileHeader{
+			Header: &gitalypb.ConflictFileHeader{
 				CommitOid: ourCommitOid,
 				OurMode:   int32(0100644),
 				OurPath:   []byte("encoding/codagé"),
 				TheirPath: []byte("encoding/codagé"),
 			},
-			content: []byte(conflictContent1),
+			Content: []byte(conflictContent1),
 		},
 		{
-			header: &gitalypb.ConflictFileHeader{
+			Header: &gitalypb.ConflictFileHeader{
 				CommitOid: ourCommitOid,
 				OurMode:   int32(0100644),
 				OurPath:   []byte("files/ruby/feature.rb"),
 				TheirPath: []byte("files/ruby/feature.rb"),
 			},
-			content: []byte(conflictContent2),
+			Content: []byte(conflictContent2),
 		},
 	}
 
@@ -86,8 +86,8 @@ end
 	require.Len(t, receivedFiles, len(expectedFiles))
 
 	for i := 0; i < len(expectedFiles); i++ {
-		testassert.ProtoEqual(t, receivedFiles[i].header, expectedFiles[i].header)
-		require.Equal(t, expectedFiles[i].content, receivedFiles[i].content)
+		testassert.ProtoEqual(t, receivedFiles[i].Header, expectedFiles[i].Header)
+		require.Equal(t, expectedFiles[i].Content, receivedFiles[i].Content)
 	}
 }
 
@@ -111,7 +111,7 @@ func TestSuccessfulListConflictFilesRequestWithAncestor(t *testing.T) {
 
 	expectedFiles := []*conflictFile{
 		{
-			header: &gitalypb.ConflictFileHeader{
+			Header: &gitalypb.ConflictFileHeader{
 				CommitOid:    ourCommitOid,
 				OurMode:      int32(0100644),
 				OurPath:      []byte("files/ruby/popen.rb"),
@@ -120,7 +120,7 @@ func TestSuccessfulListConflictFilesRequestWithAncestor(t *testing.T) {
 			},
 		},
 		{
-			header: &gitalypb.ConflictFileHeader{
+			Header: &gitalypb.ConflictFileHeader{
 				CommitOid:    ourCommitOid,
 				OurMode:      int32(0100644),
 				OurPath:      []byte("files/ruby/regex.rb"),
@@ -134,7 +134,7 @@ func TestSuccessfulListConflictFilesRequestWithAncestor(t *testing.T) {
 	require.Len(t, receivedFiles, len(expectedFiles))
 
 	for i := 0; i < len(expectedFiles); i++ {
-		testassert.ProtoEqual(t, receivedFiles[i].header, expectedFiles[i].header)
+		testassert.ProtoEqual(t, receivedFiles[i].Header, expectedFiles[i].Header)
 	}
 }
 
@@ -170,14 +170,14 @@ func TestListConflictFilesHugeDiff(t *testing.T) {
 		OurMode:   int32(0100644),
 		OurPath:   []byte("a"),
 		TheirPath: []byte("a"),
-	}, receivedFiles[0].header)
+	}, receivedFiles[0].Header)
 
 	testassert.ProtoEqual(t, &gitalypb.ConflictFileHeader{
 		CommitOid: our,
 		OurMode:   int32(0100644),
 		OurPath:   []byte("b"),
 		TheirPath: []byte("b"),
-	}, receivedFiles[1].header)
+	}, receivedFiles[1].Header)
 }
 
 func buildCommit(t *testing.T, ctx context.Context, cfg config.Cfg, repo *gitalypb.Repository, repoPath string, files map[string][]byte) string {
@@ -257,6 +257,99 @@ func TestListConflictFilesFailedPrecondition(t *testing.T) {
 	}
 }
 
+func TestListConflictFilesAllowTreeConflicts(t *testing.T) {
+	ctx, cleanup := testhelper.Context()
+	defer cleanup()
+
+	_, repo, _, client := SetupConflictsService(t, true, nil)
+
+	ourCommitOid := "eb227b3e214624708c474bdab7bde7afc17cefcc"
+	theirCommitOid := "824be604a34828eb682305f0d963056cfac87b2d"
+
+	request := &gitalypb.ListConflictFilesRequest{
+		Repository:         repo,
+		OurCommitOid:       ourCommitOid,
+		TheirCommitOid:     theirCommitOid,
+		AllowTreeConflicts: true,
+	}
+
+	c, err := client.ListConflictFiles(ctx, request)
+	require.NoError(t, err)
+
+	conflictContent := `<<<<<<< files/ruby/version_info.rb
+module Gitlab
+  class VersionInfo
+    include Comparable
+
+    attr_reader :major, :minor, :patch
+
+    def self.parse(str)
+      if str && m = str.match(%r{(\d+)\.(\d+)\.(\d+)})
+        VersionInfo.new(m[1].to_i, m[2].to_i, m[3].to_i)
+      else
+        VersionInfo.new
+      end
+    end
+
+    def initialize(major = 0, minor = 0, patch = 0)
+      @major = major
+      @minor = minor
+      @patch = patch
+    end
+
+    def <=>(other)
+      return unless other.is_a? VersionInfo
+      return unless valid? && other.valid?
+
+      if other.major < @major
+        1
+      elsif @major < other.major
+        -1
+      elsif other.minor < @minor
+        1
+      elsif @minor < other.minor
+        -1
+      elsif other.patch < @patch
+        1
+      elsif @patch < other.patch
+        25
+      else
+        0
+      end
+    end
+
+    def to_s
+      if valid?
+        "%d.%d.%d" % [@major, @minor, @patch]
+      else
+        "Unknown"
+      end
+    end
+
+    def valid?
+      @major >= 0 && @minor >= 0 && @patch >= 0 && @major + @minor + @patch > 0
+    end
+  end
+end
+=======
+>>>>>>> 
+`
+
+	expectedFiles := []*conflictFile{
+		{
+			Header: &gitalypb.ConflictFileHeader{
+				AncestorPath: []byte("files/ruby/version_info.rb"),
+				CommitOid:    ourCommitOid,
+				OurMode:      int32(0100644),
+				OurPath:      []byte("files/ruby/version_info.rb"),
+			},
+			Content: []byte(conflictContent),
+		},
+	}
+
+	testassert.ProtoEqual(t, expectedFiles, getConflictFiles(t, c))
+}
+
 func TestFailedListConflictFilesRequestDueToValidation(t *testing.T) {
 	ctx, cleanup := testhelper.Context()
 	defer cleanup()
@@ -328,10 +421,10 @@ func getConflictFiles(t *testing.T, c gitalypb.ConflictsService_ListConflictFile
 					files = append(files, currentFile)
 				}
 
-				currentFile = &conflictFile{header: header}
+				currentFile = &conflictFile{Header: header}
 			} else {
 				// Append to current file's content
-				currentFile.content = append(currentFile.content, file.GetContent()...)
+				currentFile.Content = append(currentFile.Content, file.GetContent()...)
 			}
 		}
 	}
diff --git a/proto/conflicts.proto b/proto/conflicts.proto
index c60b5baf1..b8eedb8a1 100644
--- a/proto/conflicts.proto
+++ b/proto/conflicts.proto
@@ -29,6 +29,10 @@ message ListConflictFilesRequest {
   Repository repository = 1 [(target_repository)=true];
   string our_commit_oid = 2;
   string their_commit_oid = 3;
+  // AllowTreeConflicts will not cause the request to fail in case there are
+  // tree conflicts. If set to true, then responses may contain conflict files
+  // where some of the paths are unset.
+  bool allow_tree_conflicts = 4;
 }
 
 message ConflictFileHeader {
diff --git a/proto/go/gitalypb/conflicts.pb.go b/proto/go/gitalypb/conflicts.pb.go
index 5228f85b9..ece9943b5 100644
--- a/proto/go/gitalypb/conflicts.pb.go
+++ b/proto/go/gitalypb/conflicts.pb.go
@@ -29,6 +29,10 @@ type ListConflictFilesRequest struct {
 	Repository     *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
 	OurCommitOid   string      `protobuf:"bytes,2,opt,name=our_commit_oid,json=ourCommitOid,proto3" json:"our_commit_oid,omitempty"`
 	TheirCommitOid string      `protobuf:"bytes,3,opt,name=their_commit_oid,json=theirCommitOid,proto3" json:"their_commit_oid,omitempty"`
+	// AllowTreeConflicts will not cause the request to fail in case there are
+	// tree conflicts. If set to true, then responses may contain conflict files
+	// where some of the paths are unset.
+	AllowTreeConflicts bool `protobuf:"varint,4,opt,name=allow_tree_conflicts,json=allowTreeConflicts,proto3" json:"allow_tree_conflicts,omitempty"`
 }
 
 func (x *ListConflictFilesRequest) Reset() {
@@ -84,6 +88,13 @@ func (x *ListConflictFilesRequest) GetTheirCommitOid() string {
 	return ""
 }
 
+func (x *ListConflictFilesRequest) GetAllowTreeConflicts() bool {
+	if x != nil {
+		return x.AllowTreeConflicts
+	}
+	return false
+}
+
 type ConflictFileHeader struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -567,7 +578,7 @@ var file_conflicts_proto_rawDesc = []byte{
 	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x0c, 0x73, 0x68, 0x61, 0x72, 0x65, 0x64, 0x2e, 0x70, 0x72,
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 	0x66, 0x6c, 0x69, 0x63, 0x74, 0x46, 0x69, 0x6c, 0x65, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73,
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@@ -577,91 +588,94 @@ var file_conflicts_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/ruby/proto/gitaly/conflicts_pb.rb b/ruby/proto/gitaly/conflicts_pb.rb
index e01373730..80afc797a 100644
--- a/ruby/proto/gitaly/conflicts_pb.rb
+++ b/ruby/proto/gitaly/conflicts_pb.rb
@@ -12,6 +12,7 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
       optional :repository, :message, 1, "gitaly.Repository"
       optional :our_commit_oid, :string, 2
       optional :their_commit_oid, :string, 3
+      optional :allow_tree_conflicts, :bool, 4
     end
     add_message "gitaly.ConflictFileHeader" do
       optional :commit_oid, :string, 2