Lint checks phase 2 (#1747)

* Log 3 unchecked errors

Rather than ignore errors, log them at
the WARNING log level.

The server has been functioning without these, so assume they are not at
the ERROR level.

* Log errors in concurrency test

If we can't initialize the configuration, treat the test as a failure.

* Undo the errcheck on configurations for now.

* Handle unchecked errors in pkg/manager

* Resolve unchecked errors

* Handle DLNA/DMS unchecked errors

* Handle error checking in concurrency test

Generalize config initialization, so we can initialize a configuration
without writing it to disk.

Use this in the test case, since otherwise the test fails to write.

* Handle the remaining unchecked errors

* Heed gosimple in update test

* Use one-line if-initializer statements

While here, fix a wrong variable capture error.

* testing.T doesn't support %w

use %v instead which is supported.

* Remove unused query builder functions

The Int/String criterion handler functions are now generalized.

Thus, there's no need to keep these functions around anymore.

* Mark filterBuilder.addRecursiveWith nolint

The function is useful in the future and no other refactors are looking
nice.

Keep the function around, but tell the linter to ignore it.

* Remove utils.Btoi

There are no users of this utility function

* Return error on scan failure

If we fail to scan the row when looking for the
unique checksum index, then report the error upwards.

* Fix comments on exported functions

* Fix typos

* Fix startup error

pkg/api/resolver_mutation_metadata.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"context"
+	"fmt"
 	"io/ioutil"
 	"path/filepath"
 	"strconv"
@@ -105,7 +106,9 @@ func (r *mutationResolver) BackupDatabase(ctx context.Context, input models.Back
 	mgr := manager.GetInstance()
 	var backupPath string
 	if download {
-		utils.EnsureDir(mgr.Paths.Generated.Downloads)
+		if err := utils.EnsureDir(mgr.Paths.Generated.Downloads); err != nil {
+			return nil, fmt.Errorf("could not create backup directory %v: %w", mgr.Paths.Generated.Downloads, err)
+		}
 		f, err := ioutil.TempFile(mgr.Paths.Generated.Downloads, "backup*.sqlite")
 		if err != nil {
 			return nil, err

pkg/database/custom_migrations.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	"database/sql"
+	"fmt"
 	"strings"
 
 	"github.com/jmoiron/sqlx"
@@ -26,7 +27,9 @@ func createImagesChecksumIndex() error {
 
 		if err == nil {
 			var found bool
-			row.Scan(&found)
+			if err := row.Scan(&found); err != nil && err != sql.ErrNoRows {
+				return fmt.Errorf("error while scanning for index: %w", err)
+			}
 			if found {
 				return nil
 			}

pkg/database/database.go

@@ -151,7 +151,10 @@ func Reset(databasePath string) error {
 		}
 	}
 
-	Initialize(databasePath)
+	if err := Initialize(databasePath); err != nil {
+		return fmt.Errorf("[reset DB] unable to initialize: %w", err)
+	}
+
 	return nil
 }
 
@@ -256,7 +259,9 @@ func RunMigrations() error {
 	}
 
 	// re-initialise the database
-	Initialize(dbPath)
+	if err = Initialize(dbPath); err != nil {
+		logger.Warnf("Error re-initializing the database: %v", err)
+	}
 
 	// run a vacuum on the database
 	logger.Info("Performing vacuum on database")

pkg/database/transaction.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"github.com/jmoiron/sqlx"
+	"github.com/stashapp/stash/pkg/logger"
 )
 
 // WithTxn executes the provided function within a transaction. It rolls back
@@ -17,11 +18,15 @@ func WithTxn(fn func(tx *sqlx.Tx) error) error {
 	defer func() {
 		if p := recover(); p != nil {
 			// a panic occurred, rollback and repanic
-			tx.Rollback()
+			if err := tx.Rollback(); err != nil {
+				logger.Warnf("failure when performing transaction rollback: %v", err)
+			}
 			panic(p)
 		} else if err != nil {
 			// something went wrong, rollback
-			tx.Rollback()
+			if err := tx.Rollback(); err != nil {
+				logger.Warnf("failure when performing transaction rollback: %v", err)
+			}
 		} else {
 			// all good, commit
 			err = tx.Commit()

pkg/dlna/dms.go

@@ -416,7 +416,7 @@ func (me *Server) serveIcon(w http.ResponseWriter, r *http.Request) {
 	}
 
 	var scene *models.Scene
-	me.txnManager.WithReadTxn(context.Background(), func(r models.ReaderRepository) error {
+	err := me.txnManager.WithReadTxn(context.Background(), func(r models.ReaderRepository) error {
 		idInt, err := strconv.Atoi(sceneId)
 		if err != nil {
 			return nil
@@ -424,6 +424,9 @@ func (me *Server) serveIcon(w http.ResponseWriter, r *http.Request) {
 		scene, _ = r.Scene().Find(idInt)
 		return nil
 	})
+	if err != nil {
+		logger.Warnf("failed to execute read transaction while trying to serve an icon: %v", err)
+	}
 
 	if scene == nil {
 		return
@@ -552,7 +555,7 @@ func (me *Server) initMux(mux *http.ServeMux) {
 	mux.HandleFunc(resPath, func(w http.ResponseWriter, r *http.Request) {
 		sceneId := r.URL.Query().Get("scene")
 		var scene *models.Scene
-		me.txnManager.WithReadTxn(context.Background(), func(r models.ReaderRepository) error {
+		err := me.txnManager.WithReadTxn(context.Background(), func(r models.ReaderRepository) error {
 			sceneIdInt, err := strconv.Atoi(sceneId)
 			if err != nil {
 				return nil
@@ -560,6 +563,9 @@ func (me *Server) initMux(mux *http.ServeMux) {
 			scene, _ = r.Scene().Find(sceneIdInt)
 			return nil
 		})
+		if err != nil {
+			logger.Warnf("failed to execute read transaction for scene id (%v): %v", sceneId, err)
+		}
 
 		if scene == nil {
 			return
@@ -571,7 +577,9 @@ func (me *Server) initMux(mux *http.ServeMux) {
 		w.Header().Set("content-type", `text/xml; charset="utf-8"`)
 		w.Header().Set("content-length", fmt.Sprint(len(me.rootDescXML)))
 		w.Header().Set("server", serverField)
-		w.Write(me.rootDescXML)
+		if k, err := w.Write(me.rootDescXML); err != nil {
+			logger.Warnf("could not write rootDescXML (wrote %v bytes of %v): %v", k, len(me.rootDescXML), err)
+		}
 	})
 	handleSCPDs(mux)
 	mux.HandleFunc(serviceControlURL, me.serviceControlHandler)

pkg/ffmpeg/encoder.go

@@ -63,7 +63,9 @@ func KillRunningEncoders(path string) {
 	for _, process := range processes {
 		// assume it worked, don't check for error
 		logger.Infof("Killing encoder process for file: %s", path)
-		process.Kill()
+		if err := process.Kill(); err != nil {
+			logger.Warnf("failed to kill process %v: %v", process.Pid, err)
+		}
 
 		// wait for the process to die before returning
 		// don't wait more than a few seconds

pkg/ffmpeg/stream.go

@@ -32,7 +32,9 @@ func (s *Stream) Serve(w http.ResponseWriter, r *http.Request) {
 	notify := r.Context().Done()
 	go func() {
 		<-notify
-		s.Process.Kill()
+		if err := s.Process.Kill(); err != nil {
+			logger.Warnf("unable to kill os process %v: %v", s.Process.Pid, err)
+		}
 	}()
 
 	_, err := io.Copy(w, s.Stdout)

pkg/image/image.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/stashapp/stash/pkg/logger"
 	"github.com/stashapp/stash/pkg/models"
 	"github.com/stashapp/stash/pkg/utils"
 	_ "golang.org/x/image/webp"
@@ -252,7 +253,9 @@ func Serve(w http.ResponseWriter, r *http.Request, path string) {
 			return
 		}
 
-		w.Write(data)
+		if k, err := w.Write(data); err != nil {
+			logger.Warnf("failure while serving image (wrote %v bytes out of %v): %v", k, len(data), err)
+		}
 	}
 }
 

pkg/manager/config/config.go

@@ -962,8 +962,7 @@ func (i *Instance) SetChecksumDefaultValues(defaultAlgorithm models.HashAlgorith
 	viper.SetDefault(CalculateMD5, usingMD5)
 }
 
-func (i *Instance) setDefaultValues() error {
+func (i *Instance) setDefaultValues(write bool) error {
-
 	// read data before write lock scope
 	defaultDatabaseFilePath := i.GetDefaultDatabaseFilePath()
 	defaultScrapersPath := i.GetDefaultScrapersPath()
@@ -989,11 +988,24 @@ func (i *Instance) setDefaultValues() error {
 	// Set default scrapers and plugins paths
 	viper.SetDefault(ScrapersPath, defaultScrapersPath)
 	viper.SetDefault(PluginsPath, defaultPluginsPath)
+	if write {
 		return viper.WriteConfig()
 	}
 
+	return nil
+}
+
 // SetInitialConfig fills in missing required config fields
 func (i *Instance) SetInitialConfig() error {
+	return i.setInitialConfig(true)
+}
+
+// SetInitialMemoryConfig fills in missing required config fields without writing the configuration
+func (i *Instance) SetInitialMemoryConfig() error {
+	return i.setInitialConfig(false)
+}
+
+func (i *Instance) setInitialConfig(write bool) error {
 	// generate some api keys
 	const apiKeyLength = 32
 
@@ -1007,7 +1019,7 @@ func (i *Instance) SetInitialConfig() error {
 		i.Set(SessionStoreKey, sessionStoreKey)
 	}
 
-	return i.setDefaultValues()
+	return i.setDefaultValues(write)
 }
 
 func (i *Instance) FinalizeSetup() {

pkg/manager/config/config_concurrency_test.go

@@ -17,7 +17,9 @@ func TestConcurrentConfigAccess(t *testing.T) {
 		wg.Add(1)
 		go func(wk int) {
 			for l := 0; l < loops; l++ {
-				i.SetInitialConfig()
+				if err := i.SetInitialMemoryConfig(); err != nil {
+					t.Errorf("Failure setting initial configuration in worker %v iteration %v: %v", wk, l, err)
+				}
 
 				i.HasCredentials()
 				i.GetCPUProfilePath()

pkg/manager/manager.go

@@ -110,11 +110,15 @@ func Initialize() *singleton {
 			logger.Warnf("config file %snot found. Assuming new system...", cfgFile)
 		}
 
-		initFFMPEG()
+		if err = initFFMPEG(); err != nil {
+			logger.Warnf("could not initialize FFMPEG subsystem: %v", err)
+		}
 
 		// if DLNA is enabled, start it now
 		if instance.Config.GetDLNADefaultEnabled() {
-			instance.DLNAService.Start(nil)
+			if err := instance.DLNAService.Start(nil); err != nil {
+				logger.Warnf("could not start DLNA service: %v", err)
+			}
 		}
 	})
 
@@ -134,7 +138,9 @@ func initProfiling(cpuProfilePath string) {
 	logger.Infof("profiling to %s", cpuProfilePath)
 
 	// StopCPUProfile is defer called in main
-	pprof.StartCPUProfile(f)
+	if err = pprof.StartCPUProfile(f); err != nil {
+		logger.Warnf("could not start CPU profiling: %v", err)
+	}
 }
 
 func initFFMPEG() error {
@@ -182,7 +188,9 @@ func initLog() {
 // configuration has been set. Should only be called if the configuration
 // is valid.
 func (s *singleton) PostInit() error {
-	s.Config.SetInitialConfig()
+	if err := s.Config.SetInitialConfig(); err != nil {
+		logger.Warnf("could not set initial configuration: %v", err)
+	}
 
 	s.Paths = paths.NewPaths(s.Config.GetGeneratedPath())
 	s.RefreshConfig()
@@ -201,8 +209,12 @@ func (s *singleton) PostInit() error {
 		const deleteTimeout = 1 * time.Second
 
 		utils.Timeout(func() {
-			utils.EmptyDir(instance.Paths.Generated.Downloads)
+			if err := utils.EmptyDir(instance.Paths.Generated.Downloads); err != nil {
-			utils.EmptyDir(instance.Paths.Generated.Tmp)
+				logger.Warnf("could not empty Downloads directory: %v", err)
+			}
+			if err := utils.EmptyDir(instance.Paths.Generated.Tmp); err != nil {
+				logger.Warnf("could not empty Tmp directory: %v", err)
+			}
 		}, deleteTimeout, func(done chan struct{}) {
 			logger.Info("Please wait. Deleting temporary files...") // print
 			<-done                                                  // and wait for deletion
@@ -236,11 +248,21 @@ func (s *singleton) RefreshConfig() {
 	s.Paths = paths.NewPaths(s.Config.GetGeneratedPath())
 	config := s.Config
 	if config.Validate() == nil {
-		utils.EnsureDir(s.Paths.Generated.Screenshots)
+		if err := utils.EnsureDir(s.Paths.Generated.Screenshots); err != nil {
-		utils.EnsureDir(s.Paths.Generated.Vtt)
+			logger.Warnf("could not create directory for Screenshots: %v", err)
-		utils.EnsureDir(s.Paths.Generated.Markers)
+		}
-		utils.EnsureDir(s.Paths.Generated.Transcodes)
+		if err := utils.EnsureDir(s.Paths.Generated.Vtt); err != nil {
-		utils.EnsureDir(s.Paths.Generated.Downloads)
+			logger.Warnf("could not create directory for VTT: %v", err)
+		}
+		if err := utils.EnsureDir(s.Paths.Generated.Markers); err != nil {
+			logger.Warnf("could not create directory for Markers: %v", err)
+		}
+		if err := utils.EnsureDir(s.Paths.Generated.Transcodes); err != nil {
+			logger.Warnf("could not create directory for Transcodes: %v", err)
+		}
+		if err := utils.EnsureDir(s.Paths.Generated.Downloads); err != nil {
+			logger.Warnf("could not create directory for Downloads: %v", err)
+		}
 	}
 }
 
@@ -304,7 +326,9 @@ func (s *singleton) Setup(input models.SetupInput) error {
 
 	s.Config.FinalizeSetup()
 
-	initFFMPEG()
+	if err := initFFMPEG(); err != nil {
+		return fmt.Errorf("error initializing FFMPEG subsystem: %v", err)
+	}
 
 	return nil
 }

pkg/manager/task_export.go

@@ -174,7 +174,9 @@ func (t *ExportTask) Start(wg *sync.WaitGroup) {
 
 func (t *ExportTask) generateDownload() error {
 	// zip the files and register a download link
-	utils.EnsureDir(instance.Paths.Generated.Downloads)
+	if err := utils.EnsureDir(instance.Paths.Generated.Downloads); err != nil {
+		return err
+	}
 	z, err := ioutil.TempFile(instance.Paths.Generated.Downloads, "export*.zip")
 	if err != nil {
 		return err

pkg/manager/task_generate_markers.go

@@ -78,7 +78,9 @@ func (t *GenerateMarkersTask) generateSceneMarkers() {
 
 	// Make the folder for the scenes markers
 	markersFolder := filepath.Join(instance.Paths.Generated.Markers, sceneHash)
-	utils.EnsureDir(markersFolder)
+	if err := utils.EnsureDir(markersFolder); err != nil {
+		logger.Warnf("could not create the markers folder (%v): %v", markersFolder, err)
+	}
 
 	for i, sceneMarker := range sceneMarkers {
 		index := i + 1

pkg/manager/task_stash_box_tag.go

@@ -153,7 +153,7 @@ func (t *StashBoxPerformerTagTask) stashBoxPerformerTag() {
 				partial.URL = &value
 			}
 
-			t.txnManager.WithTxn(context.TODO(), func(r models.Repository) error {
+			txnErr := t.txnManager.WithTxn(context.TODO(), func(r models.Repository) error {
 				_, err := r.Performer().Update(partial)
 
 				if !t.refresh {
@@ -188,6 +188,9 @@ func (t *StashBoxPerformerTagTask) stashBoxPerformerTag() {
 				}
 				return err
 			})
+			if txnErr != nil {
+				logger.Warnf("failure to execute partial update of performer: %v", err)
+			}
 		} else if t.name != nil && performer.Name != nil {
 			currentTime := time.Now()
 			newPerformer := models.Performer{

pkg/models/transaction.go

@@ -1,6 +1,10 @@
 package models
 
-import "context"
+import (
+	"context"
+
+	"github.com/stashapp/stash/pkg/logger"
+)
 
 type Transaction interface {
 	Begin() error
@@ -30,11 +34,15 @@ func WithTxn(txn Transaction, fn func(r Repository) error) error {
 	defer func() {
 		if p := recover(); p != nil {
 			// a panic occurred, rollback and repanic
-			txn.Rollback()
+			if err := txn.Rollback(); err != nil {
+				logger.Warnf("error while trying to roll back transaction: %v", err)
+			}
 			panic(p)
 		} else if err != nil {
 			// something went wrong, rollback
-			txn.Rollback()
+			if err := txn.Rollback(); err != nil {
+				logger.Warnf("error while trying to roll back transaction: %v", err)
+			}
 		} else {
 			// all good, commit
 			err = txn.Commit()
@@ -54,11 +62,15 @@ func WithROTxn(txn ReadTransaction, fn func(r ReaderRepository) error) error {
 	defer func() {
 		if p := recover(); p != nil {
 			// a panic occurred, rollback and repanic
-			txn.Rollback()
+			if err := txn.Rollback(); err != nil {
+				logger.Warnf("error while trying to roll back RO transaction: %v", err)
+			}
 			panic(p)
 		} else if err != nil {
 			// something went wrong, rollback
-			txn.Rollback()
+			if err := txn.Rollback(); err != nil {
+				logger.Warnf("error while trying to roll back RO transaction: %v", err)
+			}
 		} else {
 			// all good, commit
 			err = txn.Commit()

pkg/scraper/script.go

@@ -48,7 +48,9 @@ func (s *scriptScraper) runScraperScript(inString string, out interface{}) error
 	go func() {
 		defer stdin.Close()
 
-		io.WriteString(stdin, inString)
+		if n, err := io.WriteString(stdin, inString); err != nil {
+			logger.Warnf("failure to write full input to script (wrote %v bytes out of %v): %v", n, len(inString), err)
+		}
 	}()
 
 	stderr, err := cmd.StderrPipe()

pkg/scraper/xpath.go

@@ -235,7 +235,9 @@ func (s *xpathScraper) loadURL(url string) (*html.Node, error) {
 
 	if err == nil && s.config.DebugOptions != nil && s.config.DebugOptions.PrintHTML {
 		var b bytes.Buffer
-		html.Render(&b, ret)
+		if err := html.Render(&b, ret); err != nil {
+			logger.Warnf("could not render HTML: %v", err)
+		}
 		logger.Infof("loadURL (%s) response: \n%s", url, b.String())
 	}
 

pkg/sqlite/filter.go

@@ -193,6 +193,7 @@ func (f *filterBuilder) addWith(sql string, args ...interface{}) {
 }
 
 // addRecursiveWith adds a with clause and arguments to the filter, and sets it to recursive
+//nolint:unused
 func (f *filterBuilder) addRecursiveWith(sql string, args ...interface{}) {
 	if sql == "" {
 		return

pkg/sqlite/query.go

@@ -1,11 +1,7 @@
 package sqlite
 
 import (
-	"fmt"
-	"regexp"
 	"strings"
-
-	"github.com/stashapp/stash/pkg/models"
 )
 
 type queryBuilder struct {
@@ -139,67 +135,3 @@ func (qb *queryBuilder) addFilter(f *filterBuilder) {
 
 	qb.addJoins(f.getAllJoins()...)
 }
-
-func (qb *queryBuilder) handleIntCriterionInput(c *models.IntCriterionInput, column string) {
-	if c != nil {
-		clause, args := getIntCriterionWhereClause(column, *c)
-		qb.addWhere(clause)
-		qb.addArg(args...)
-	}
-}
-
-func (qb *queryBuilder) handleStringCriterionInput(c *models.StringCriterionInput, column string) {
-	if c != nil {
-		if modifier := c.Modifier; c.Modifier.IsValid() {
-			switch modifier {
-			case models.CriterionModifierIncludes:
-				clause, thisArgs := getSearchBinding([]string{column}, c.Value, false)
-				qb.addWhere(clause)
-				qb.addArg(thisArgs...)
-			case models.CriterionModifierExcludes:
-				clause, thisArgs := getSearchBinding([]string{column}, c.Value, true)
-				qb.addWhere(clause)
-				qb.addArg(thisArgs...)
-			case models.CriterionModifierEquals:
-				qb.addWhere(column + " LIKE ?")
-				qb.addArg(c.Value)
-			case models.CriterionModifierNotEquals:
-				qb.addWhere(column + " NOT LIKE ?")
-				qb.addArg(c.Value)
-			case models.CriterionModifierMatchesRegex:
-				if _, err := regexp.Compile(c.Value); err != nil {
-					qb.err = err
-					return
-				}
-				qb.addWhere(fmt.Sprintf("(%s IS NOT NULL AND %[1]s regexp ?)", column))
-				qb.addArg(c.Value)
-			case models.CriterionModifierNotMatchesRegex:
-				if _, err := regexp.Compile(c.Value); err != nil {
-					qb.err = err
-					return
-				}
-				qb.addWhere(fmt.Sprintf("(%s IS NULL OR %[1]s NOT regexp ?)", column))
-				qb.addArg(c.Value)
-			case models.CriterionModifierIsNull:
-				qb.addWhere("(" + column + " IS NULL OR TRIM(" + column + ") = '')")
-			case models.CriterionModifierNotNull:
-				qb.addWhere("(" + column + " IS NOT NULL AND TRIM(" + column + ") != '')")
-			default:
-				clause, count := getSimpleCriterionClause(modifier, "?")
-				qb.addWhere(column + " " + clause)
-				if count == 1 {
-					qb.addArg(c.Value)
-				}
-			}
-		}
-	}
-}
-
-func (qb *queryBuilder) handleCountCriterion(countFilter *models.IntCriterionInput, primaryTable, joinTable, primaryFK string) {
-	if countFilter != nil {
-		clause, args := getCountCriterionClause(primaryTable, joinTable, primaryFK, *countFilter)
-
-		qb.addWhere(clause)
-		qb.addArg(args...)
-	}
-}

pkg/tag/update_test.go

@@ -2,11 +2,12 @@ package tag
 
 import (
 	"fmt"
+	"testing"
+
 	"github.com/stashapp/stash/pkg/models"
 	"github.com/stashapp/stash/pkg/models/mocks"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
-	"testing"
 )
 
 var testUniqueHierarchyTags = map[int]*models.Tag{
@@ -211,8 +212,7 @@ func testEnsureUniqueHierarchy(t *testing.T, tc testUniqueHierarchyCase, queryPa
 	mockTagReader := &mocks.TagReaderWriter{}
 
 	var parentIDs, childIDs []int
-	var find map[int]*models.Tag
+	find := make(map[int]*models.Tag)
-	find = make(map[int]*models.Tag)
 	if tc.parents != nil {
 		parentIDs = make([]int, 0)
 		for _, parent := range tc.parents {
@@ -262,7 +262,7 @@ func testEnsureUniqueHierarchy(t *testing.T, tc testUniqueHierarchyCase, queryPa
 		}
 		return nil
 	}, func(tagID int, excludeIDs []int) error {
-		for id, _ := range tc.onFindAllAncestors {
+		for id := range tc.onFindAllAncestors {
 			if id == tagID {
 				return nil
 			}
@@ -278,7 +278,7 @@ func testEnsureUniqueHierarchy(t *testing.T, tc testUniqueHierarchyCase, queryPa
 		}
 		return nil
 	}, func(tagID int, excludeIDs []int) error {
-		for id, _ := range tc.onFindAllDescendants {
+		for id := range tc.onFindAllDescendants {
 			if id == tagID {
 				return nil
 			}

pkg/utils/boolean.go

@@ -1,13 +1,5 @@
 package utils
 
-// Btoi transforms a boolean to an int.  1 for true, false otherwise
-func Btoi(b bool) int {
-	if b {
-		return 1
-	}
-	return 0
-}
-
 // IsTrue returns true if the bool pointer is not nil and true.
 func IsTrue(b *bool) bool {
 	return b != nil && *b

pkg/utils/oshash_internal_test.go

@@ -12,7 +12,7 @@ func TestOshashEmpty(t *testing.T) {
 	want := "0000000000000000"
 	got, err := oshash(size, head, tail)
 	if err != nil {
-		t.Errorf("TestOshashEmpty: Error from oshash: %w", err)
+		t.Errorf("TestOshashEmpty: Error from oshash: %v", err)
 	}
 	if got != want {
 		t.Errorf("TestOshashEmpty: oshash(0, 0, 0) = %q; want %q", got, want)