Merge branch 'pks-user-squash-always-use-structured-errors' into 'master'

operations: Always use structured errors for UserSquash

Closes #4099

See merge request gitlab-org/gitaly!4424

6 files changed, 271 insertions, 343 deletions

diff --git a/internal/gitaly/service/operations/apply_patch.go b/internal/gitaly/service/operations/apply_patch.go
index 6c58d6bf0..f87cec969 100644
--- a/internal/gitaly/service/operations/apply_patch.go
+++ b/internal/gitaly/service/operations/apply_patch.go
@@ -22,6 +22,17 @@ import (
 
 var errNoDefaultBranch = errors.New("no default branch")
 
+type gitError struct {
+	// ErrMsg error message from 'git' executable if any.
+	ErrMsg string
+	// Err is an error that happened during rebase process.
+	Err error
+}
+
+func (er gitError) Error() string {
+	return er.ErrMsg + ": " + er.Err.Error()
+}
+
 //nolint: revive,stylecheck // This is unintentionally missing documentation.
 func (s *Server) UserApplyPatch(stream gitalypb.OperationService_UserApplyPatchServer) error {
 	firstRequest, err := stream.Recv()
diff --git a/internal/gitaly/service/operations/squash.go b/internal/gitaly/service/operations/squash.go
index 096dfc68b..1129d2658 100644
--- a/internal/gitaly/service/operations/squash.go
+++ b/internal/gitaly/service/operations/squash.go
@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/grpc-ecosystem/go-grpc-middleware/logging/logrus/ctxlogrus"
 	"gitlab.com/gitlab-org/gitaly/v14/internal/git"
 	"gitlab.com/gitlab-org/gitaly/v14/internal/git/localrepo"
 	"gitlab.com/gitlab-org/gitaly/v14/internal/git/quarantine"
@@ -21,7 +20,6 @@ import (
 
 const (
 	gitlabWorktreesSubDir = "gitlab-worktree"
-	ambiguousArgumentFmt  = "fatal: ambiguous argument '%s...%s': unknown revision or path not in the working tree.\nUse '--' to separate paths from revisions, like this:\n'git <command> [<revision>...] -- [<file>...]'\n"
 )
 
 // UserSquash collapses a range of commits identified via a start and end revision into a single
@@ -33,15 +31,6 @@ func (s *Server) UserSquash(ctx context.Context, req *gitalypb.UserSquashRequest
 
 	sha, err := s.userSquash(ctx, req)
 	if err != nil {
-		var gitErr gitError
-		if errors.As(err, &gitErr) {
-			if gitErr.ErrMsg != "" {
-				// we log an actual error as it would be lost otherwise (it is not sent back to the client)
-				ctxlogrus.Extract(ctx).WithError(err).Error("user squash")
-				return &gitalypb.UserSquashResponse{GitError: gitErr.ErrMsg}, nil
-			}
-		}
-
 		return nil, helper.ErrInternal(err)
 	}
 
@@ -92,17 +81,6 @@ func validateUserSquashRequest(req *gitalypb.UserSquashRequest) error {
 	return nil
 }
 
-type gitError struct {
-	// ErrMsg error message from 'git' executable if any.
-	ErrMsg string
-	// Err is an error that happened during rebase process.
-	Err error
-}
-
-func (er gitError) Error() string {
-	return er.ErrMsg + ": " + er.Err.Error()
-}
-
 func (s *Server) userSquash(ctx context.Context, req *gitalypb.UserSquashRequest) (string, error) {
 	repo := s.localrepo(req.GetRepository())
 	repoPath, err := repo.Path()
@@ -131,59 +109,41 @@ func (s *Server) userSquash(ctx context.Context, req *gitalypb.UserSquashRequest
 	// all parents of the start commit.
 	startCommit, err := repo.ResolveRevision(ctx, git.Revision(req.GetStartSha()+"^{commit}"))
 	if err != nil {
-		if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-			detailedErr, err := helper.ErrWithDetails(
-				helper.ErrInvalidArgumentf("resolving start revision: %w", err),
-				&gitalypb.UserSquashError{
-					Error: &gitalypb.UserSquashError_ResolveRevision{
-						ResolveRevision: &gitalypb.ResolveRevisionError{
-							Revision: []byte(req.GetStartSha()),
-						},
+		detailedErr, err := helper.ErrWithDetails(
+			helper.ErrInvalidArgumentf("resolving start revision: %w", err),
+			&gitalypb.UserSquashError{
+				Error: &gitalypb.UserSquashError_ResolveRevision{
+					ResolveRevision: &gitalypb.ResolveRevisionError{
+						Revision: []byte(req.GetStartSha()),
 					},
 				},
-			)
-			if err != nil {
-				return "", helper.ErrInternalf("error details: %w", err)
-			}
-
-			return "", detailedErr
+			},
+		)
+		if err != nil {
+			return "", helper.ErrInternalf("error details: %w", err)
 		}
 
-		return "", fmt.Errorf("cannot resolve start commit: %w", gitError{
-			// This error is simply for backwards compatibility. We should just
-			// return the plain error eventually.
-			Err:    err,
-			ErrMsg: fmt.Sprintf(ambiguousArgumentFmt, req.GetStartSha(), req.GetEndSha()),
-		})
+		return "", detailedErr
 	}
 
 	// And we need to take the tree of the end commit. This tree already is the result
 	endCommit, err := repo.ResolveRevision(ctx, git.Revision(req.GetEndSha()+"^{commit}"))
 	if err != nil {
-		if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-			detailedErr, err := helper.ErrWithDetails(
-				helper.ErrInvalidArgumentf("resolving end revision: %w", err),
-				&gitalypb.UserSquashError{
-					Error: &gitalypb.UserSquashError_ResolveRevision{
-						ResolveRevision: &gitalypb.ResolveRevisionError{
-							Revision: []byte(req.GetEndSha()),
-						},
+		detailedErr, err := helper.ErrWithDetails(
+			helper.ErrInvalidArgumentf("resolving end revision: %w", err),
+			&gitalypb.UserSquashError{
+				Error: &gitalypb.UserSquashError_ResolveRevision{
+					ResolveRevision: &gitalypb.ResolveRevisionError{
+						Revision: []byte(req.GetEndSha()),
 					},
 				},
-			)
-			if err != nil {
-				return "", helper.ErrInternalf("error details: %w", err)
-			}
-
-			return "", detailedErr
+			},
+		)
+		if err != nil {
+			return "", helper.ErrInternalf("error details: %w", err)
 		}
 
-		return "", fmt.Errorf("cannot resolve end commit's tree: %w", gitError{
-			// This error is simply for backwards compatibility. We should just
-			// return the plain error eventually.
-			Err:    err,
-			ErrMsg: fmt.Sprintf(ambiguousArgumentFmt, req.GetStartSha(), req.GetEndSha()),
-		})
+		return "", detailedErr
 	}
 
 	commitDate, err := dateFromProto(req)
@@ -203,39 +163,32 @@ func (s *Server) userSquash(ctx context.Context, req *gitalypb.UserSquashRequest
 		SkipEmptyCommits: true,
 	})
 	if err != nil {
-		if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-			var conflictErr git2go.ConflictingFilesError
-
-			if errors.As(err, &conflictErr) {
-				conflictingFiles := make([][]byte, 0, len(conflictErr.ConflictingFiles))
-				for _, conflictingFile := range conflictErr.ConflictingFiles {
-					conflictingFiles = append(conflictingFiles, []byte(conflictingFile))
-				}
-
-				detailedErr, err := helper.ErrWithDetails(
-					helper.ErrFailedPreconditionf("rebasing commits: %w", err),
-					&gitalypb.UserSquashError{
-						Error: &gitalypb.UserSquashError_RebaseConflict{
-							RebaseConflict: &gitalypb.MergeConflictError{
-								ConflictingFiles: conflictingFiles,
-							},
+		var conflictErr git2go.ConflictingFilesError
+
+		if errors.As(err, &conflictErr) {
+			conflictingFiles := make([][]byte, 0, len(conflictErr.ConflictingFiles))
+			for _, conflictingFile := range conflictErr.ConflictingFiles {
+				conflictingFiles = append(conflictingFiles, []byte(conflictingFile))
+			}
+
+			detailedErr, err := helper.ErrWithDetails(
+				helper.ErrFailedPreconditionf("rebasing commits: %w", err),
+				&gitalypb.UserSquashError{
+					Error: &gitalypb.UserSquashError_RebaseConflict{
+						RebaseConflict: &gitalypb.MergeConflictError{
+							ConflictingFiles: conflictingFiles,
 						},
 					},
-				)
-				if err != nil {
-					return "", helper.ErrInternalf("error details: %w", err)
-				}
-
-				return "", detailedErr
+				},
+			)
+			if err != nil {
+				return "", helper.ErrInternalf("error details: %w", err)
 			}
 
-			return "", helper.ErrInternalf("rebasing commits: %w", err)
+			return "", detailedErr
 		}
 
-		return "", fmt.Errorf("rebasing end onto start commit: %w", gitError{
-			Err:    err,
-			ErrMsg: err.Error(),
-		})
+		return "", helper.ErrInternalf("rebasing commits: %w", err)
 	}
 
 	treeID, err := repo.ResolveRevision(ctx, rebasedCommitID.Revision()+"^{tree}")
@@ -271,14 +224,7 @@ func (s *Server) userSquash(ctx context.Context, req *gitalypb.UserSquashRequest
 			treeID.String(),
 		},
 	}, git.WithStdout(&stdout), git.WithStderr(&stderr), git.WithEnv(commitEnv...)); err != nil {
-		if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-			return "", helper.ErrInternalf("creating squashed commit: %w", err)
-		}
-
-		return "", fmt.Errorf("creating commit: %w", gitError{
-			Err:    err,
-			ErrMsg: stderr.String(),
-		})
+		return "", helper.ErrInternalf("creating squashed commit: %w", err)
 	}
 
 	commitID := text.ChompBytes(stdout.Bytes())
diff --git a/internal/gitaly/service/operations/squash_test.go b/internal/gitaly/service/operations/squash_test.go
index f20f12fe5..f412fa335 100644
--- a/internal/gitaly/service/operations/squash_test.go
+++ b/internal/gitaly/service/operations/squash_test.go
@@ -78,6 +78,7 @@ func testUserSquashSuccessful(t *testing.T, ctx context.Context) {
 
 			response, err := client.UserSquash(ctx, request)
 			require.NoError(t, err)
+			//nolint:staticcheck
 			require.Empty(t, response.GetGitError())
 
 			commit, err := repo.ReadCommit(ctx, git.Revision(response.SquashSha))
@@ -250,6 +251,7 @@ func testUserSquashStableID(t *testing.T, ctx context.Context) {
 		Timestamp:     &timestamppb.Timestamp{Seconds: 1234512345},
 	})
 	require.NoError(t, err)
+	//nolint:staticcheck
 	require.Empty(t, response.GetGitError())
 
 	commit, err := repo.ReadCommit(ctx, git.Revision(response.SquashSha))
@@ -314,6 +316,7 @@ func testUserSquashThreeWayMerge(t *testing.T, ctx context.Context) {
 
 	response, err := client.UserSquash(ctx, request)
 	require.NoError(t, err)
+	//nolint:staticcheck
 	require.Empty(t, response.GetGitError())
 
 	commit, err := repo.ReadCommit(ctx, git.Revision(response.SquashSha))
@@ -351,6 +354,7 @@ func testUserSquashSplitIndex(t *testing.T, ctx context.Context) {
 
 	response, err := client.UserSquash(ctx, request)
 	require.NoError(t, err)
+	//nolint:staticcheck
 	require.Empty(t, response.GetGitError())
 	require.False(t, ensureSplitIndexExists(t, cfg, repoPath))
 }
@@ -403,6 +407,7 @@ func testUserSquashRenames(t *testing.T, ctx context.Context) {
 
 	response, err := client.UserSquash(ctx, request)
 	require.NoError(t, err)
+	//nolint:staticcheck
 	require.Empty(t, response.GetGitError())
 
 	commit, err := repo.ReadCommit(ctx, git.Revision(response.SquashSha))
@@ -440,6 +445,7 @@ func testUserSquashMissingFileOnTargetBranch(t *testing.T, ctx context.Context)
 
 	response, err := client.UserSquash(ctx, request)
 	require.NoError(t, err)
+	//nolint:staticcheck
 	require.Empty(t, response.GetGitError())
 }
 
@@ -648,7 +654,6 @@ func TestUserSquash_validation(t *testing.T) {
 
 func TestUserSquash_conflicts(t *testing.T) {
 	testhelper.NewFeatureSets(
-		featureflag.UserSquashImprovedErrorHandling,
 		featureflag.UserSquashQuarantinedVoting,
 	).Run(t, testUserSquashConflicts)
 }
@@ -682,26 +687,19 @@ func testUserSquashConflicts(t *testing.T, ctx context.Context) {
 		EndSha:        ours.String(),
 	})
 
-	if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-		testhelper.RequireGrpcError(t, errWithDetails(t,
-			helper.ErrFailedPreconditionf("rebasing commits: rebase: commit %q: there are conflicting files", ours),
-			&gitalypb.UserSquashError{
-				Error: &gitalypb.UserSquashError_RebaseConflict{
-					RebaseConflict: &gitalypb.MergeConflictError{
-						ConflictingFiles: [][]byte{
-							[]byte("b"),
-						},
+	testhelper.RequireGrpcError(t, errWithDetails(t,
+		helper.ErrFailedPreconditionf("rebasing commits: rebase: commit %q: there are conflicting files", ours),
+		&gitalypb.UserSquashError{
+			Error: &gitalypb.UserSquashError_RebaseConflict{
+				RebaseConflict: &gitalypb.MergeConflictError{
+					ConflictingFiles: [][]byte{
+						[]byte("b"),
 					},
 				},
 			},
-		), err)
-		require.Nil(t, response)
-	} else {
-		require.NoError(t, err)
-		testhelper.ProtoEqual(t, &gitalypb.UserSquashResponse{
-			GitError: fmt.Sprintf("rebase: commit %q: there are conflicting files", ours),
-		}, response)
-	}
+		},
+	), err)
+	require.Nil(t, response)
 }
 
 func TestUserSquash_ancestry(t *testing.T) {
@@ -745,7 +743,6 @@ func testUserSquashAncestry(t *testing.T, ctx context.Context) {
 func TestUserSquash_gitError(t *testing.T) {
 	t.Parallel()
 	testhelper.NewFeatureSets(
-		featureflag.UserSquashImprovedErrorHandling,
 		featureflag.UserSquashQuarantinedVoting,
 	).Run(t, testUserSquashGitError)
 }
@@ -771,31 +768,16 @@ func testUserSquashGitError(t *testing.T, ctx context.Context) {
 				StartSha:      "doesntexisting",
 				EndSha:        endSha,
 			},
-			expectedErr: func() error {
-				if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-					return errWithDetails(t,
-						helper.ErrInvalidArgumentf("resolving start revision: reference not found"),
-						&gitalypb.UserSquashError{
-							Error: &gitalypb.UserSquashError_ResolveRevision{
-								ResolveRevision: &gitalypb.ResolveRevisionError{
-									Revision: []byte("doesntexisting"),
-								},
-							},
+			expectedErr: errWithDetails(t,
+				helper.ErrInvalidArgumentf("resolving start revision: reference not found"),
+				&gitalypb.UserSquashError{
+					Error: &gitalypb.UserSquashError_ResolveRevision{
+						ResolveRevision: &gitalypb.ResolveRevisionError{
+							Revision: []byte("doesntexisting"),
 						},
-					)
-				}
-
-				return nil
-			}(),
-			expectedResponse: func() *gitalypb.UserSquashResponse {
-				if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-					return nil
-				}
-
-				return &gitalypb.UserSquashResponse{
-					GitError: "fatal: ambiguous argument 'doesntexisting...54cec5282aa9f21856362fe321c800c236a61615': unknown revision or path not in the working tree.\nUse '--' to separate paths from revisions, like this:\n'git <command> [<revision>...] -- [<file>...]'\n",
-				}
-			}(),
+					},
+				},
+			),
 		},
 		{
 			desc: "not existing end SHA",
@@ -807,31 +789,16 @@ func testUserSquashGitError(t *testing.T, ctx context.Context) {
 				StartSha:      startSha,
 				EndSha:        "doesntexisting",
 			},
-			expectedErr: func() error {
-				if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-					return errWithDetails(t,
-						helper.ErrInvalidArgumentf("resolving end revision: reference not found"),
-						&gitalypb.UserSquashError{
-							Error: &gitalypb.UserSquashError_ResolveRevision{
-								ResolveRevision: &gitalypb.ResolveRevisionError{
-									Revision: []byte("doesntexisting"),
-								},
-							},
+			expectedErr: errWithDetails(t,
+				helper.ErrInvalidArgumentf("resolving end revision: reference not found"),
+				&gitalypb.UserSquashError{
+					Error: &gitalypb.UserSquashError_ResolveRevision{
+						ResolveRevision: &gitalypb.ResolveRevisionError{
+							Revision: []byte("doesntexisting"),
 						},
-					)
-				}
-
-				return nil
-			}(),
-			expectedResponse: func() *gitalypb.UserSquashResponse {
-				if featureflag.UserSquashImprovedErrorHandling.IsEnabled(ctx) {
-					return nil
-				}
-
-				return &gitalypb.UserSquashResponse{
-					GitError: "fatal: ambiguous argument 'b83d6e391c22777fca1ed3012fce84f633d7fed0...doesntexisting': unknown revision or path not in the working tree.\nUse '--' to separate paths from revisions, like this:\n'git <command> [<revision>...] -- [<file>...]'\n",
-				}
-			}(),
+					},
+				},
+			),
 		},
 		{
 			desc: "user has no name set",
diff --git a/internal/metadata/featureflag/ff_user_squash_improved_error_handling.go b/internal/metadata/featureflag/ff_user_squash_improved_error_handling.go
deleted file mode 100644
index e749e6f84..000000000
--- a/internal/metadata/featureflag/ff_user_squash_improved_error_handling.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package featureflag
-
-// UserSquashImprovedErrorHandling enables proper error handling in the UserSquash RPC. When this
-// flag is disabled many error cases were returning successfully with an error message embedded in
-// the response. With this flag enabled, this is converted to return real gRPC errors with
-// structured errors.
-var UserSquashImprovedErrorHandling = NewFeatureFlag("user_squash_improved_error_handling", false)
diff --git a/proto/go/gitalypb/operations.pb.go b/proto/go/gitalypb/operations.pb.go
index 40afa1103..295efc276 100644
--- a/proto/go/gitalypb/operations.pb.go
+++ b/proto/go/gitalypb/operations.pb.go
@@ -2712,7 +2712,12 @@ type UserSquashResponse struct {
 
 	// squash_sha is the object ID of the squashed commit.
 	SquashSha string `protobuf:"bytes,1,opt,name=squash_sha,json=squashSha,proto3" json:"squash_sha,omitempty"`
-	GitError  string `protobuf:"bytes,3,opt,name=git_error,json=gitError,proto3" json:"git_error,omitempty"`
+	// GitError is not used anymore. Instead, this RPC always returns a real
+	// error with an optional UserRebaseConfirmableError, which may be set on
+	// special errors.
+	//
+	// Deprecated: Do not use.
+	GitError string `protobuf:"bytes,3,opt,name=git_error,json=gitError,proto3" json:"git_error,omitempty"`
 }
 
 func (x *UserSquashResponse) Reset() {
@@ -2754,6 +2759,7 @@ func (x *UserSquashResponse) GetSquashSha() string {
 	return ""
 }
 
+// Deprecated: Do not use.
 func (x *UserSquashResponse) GetGitError() string {
 	if x != nil {
 		return x.GitError
@@ -3891,186 +3897,187 @@ var file_operations_proto_rawDesc = []byte{
 	0x1a, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
 	0x66, 0x2e, 0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x52, 0x09, 0x74, 0x69, 0x6d,
 	0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x4a, 0x04, 0x08, 0x03, 0x10, 0x04, 0x4a, 0x04, 0x08, 0x04,
-	0x10, 0x05, 0x52, 0x09, 0x73, 0x71, 0x75, 0x61, 0x73, 0x68, 0x5f, 0x69, 0x64, 0x22, 0x69, 0x0a,
+	0x10, 0x05, 0x52, 0x09, 0x73, 0x71, 0x75, 0x61, 0x73, 0x68, 0x5f, 0x69, 0x64, 0x22, 0x6d, 0x0a,
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 }
 
 var (
diff --git a/proto/operations.proto b/proto/operations.proto
index d2087d953..bba44db15 100644
--- a/proto/operations.proto
+++ b/proto/operations.proto
@@ -649,7 +649,11 @@ message UserSquashResponse {
   // DEPRECATED: https://gitlab.com/gitlab-org/gitaly/proto/merge_requests/161
   reserved 2;
   reserved "pre_receive_error";
-  string git_error = 3;
+
+  // GitError is not used anymore. Instead, this RPC always returns a real
+  // error with an optional UserRebaseConfirmableError, which may be set on
+  // special errors.
+  string git_error = 3 [deprecated=true];
 }
 
 message UserRebaseConfirmableError {