diff --git a/.golangci.yml b/.golangci.yml
index 35faffd..6e4119b 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -6,28 +6,72 @@ run:
 linters:
   disable-all: true
   enable:
+    - asasalint
+    - asciicheck
+    - bidichk
     - bodyclose
+    - containedctx
+    - decorder
     - dogsled
+    - dupword
+    - durationcheck
     - errcheck
+    - errchkjson
+    - errname
+    - errorlint
+    - execinquery
     - exportloopref
+    - forbidigo
+    - ginkgolinter
+    - gocheckcompilerdirectives
     - gochecknoglobals
     - gochecknoinits
     - goconst
     - gocritic
     - gocyclo
+    - gofmt
+    - gofumpt
+    - goheader
+    - goimports
+    - gomoddirectives
+    - gomodguard
     - goprintffuncname
     - gosec
     - gosimple
+    - gosmopolitan
     - govet
+    - grouper
+    - importas
     - ineffassign
+    - loggercheck
+    - makezero
+    - mirror
     - misspell
+    - musttag
     - nakedret
+    - nestif
+    - nilerr
+    - nosprintfhostport
+    - paralleltest
+    - predeclared
+    - promlinter
+    - reassign
     - revive
     - rowserrcheck
+    - sqlclosecheck
     - staticcheck
     - stylecheck
+    - tenv
+    - testableexamples
+    - thelper
+    - tparallel
     - typecheck
     - unconvert
+    - unparam
+    - unused
+    - wastedassign
+    - whitespace
+    - zerologlint
 
 issues:
   exclude-rules:
diff --git a/cmd/gonic/gonic.go b/cmd/gonic/gonic.go
index 60be307..6ee3e39 100644
--- a/cmd/gonic/gonic.go
+++ b/cmd/gonic/gonic.go
@@ -1,6 +1,4 @@
-// Package main is the gonic server entrypoint
-//
-//nolint:lll,gocyclo
+//nolint:lll,gocyclo,forbidigo
 package main
 
 import (
@@ -370,8 +368,10 @@ func main() {
 
 const pathAliasSep = "->"
 
-type pathAliases []pathAlias
-type pathAlias struct{ alias, path string }
+type (
+	pathAliases []pathAlias
+	pathAlias   struct{ alias, path string }
+)
 
 func (pa pathAliases) String() string {
 	var strs []string
diff --git a/db/db_test.go b/db/db_test.go
index d28e00c..9b353e5 100644
--- a/db/db_test.go
+++ b/db/db_test.go
@@ -21,6 +21,8 @@ func randKey() string {
 }
 
 func TestGetSetting(t *testing.T) {
+	t.Parallel()
+
 	key := SettingKey(randKey())
 	value := "howdy"
 
diff --git a/db/model.go b/db/model.go
index ade2c5f..43e7481 100644
--- a/db/model.go
+++ b/db/model.go
@@ -1,5 +1,3 @@
-// Package db provides database helpers and models
-//
 //nolint:lll // struct tags get very long and can't be split
 package db
 
@@ -238,7 +236,7 @@ func (a *Album) GenreStrings() []string {
 }
 
 func (a *Album) ArtistsStrings() []string {
-	var artists = append([]*Artist(nil), a.Artists...)
+	artists := append([]*Artist(nil), a.Artists...)
 	sort.Slice(artists, func(i, j int) bool {
 		return artists[i].ID < artists[j].ID
 	})
diff --git a/fileutil/fileutil_test.go b/fileutil/fileutil_test.go
index 88c552c..a8cb480 100644
--- a/fileutil/fileutil_test.go
+++ b/fileutil/fileutil_test.go
@@ -9,6 +9,8 @@ import (
 )
 
 func TestUniquePath(t *testing.T) {
+	t.Parallel()
+
 	unq := func(base, filename string, count uint) string {
 		r, err := unique(base, filename, count)
 		require.NoError(t, err)
@@ -40,6 +42,8 @@ func TestUniquePath(t *testing.T) {
 }
 
 func TestFirst(t *testing.T) {
+	t.Parallel()
+
 	base := t.TempDir()
 	name := filepath.Join(base, "test")
 	_, err := os.Create(name)
@@ -52,5 +56,4 @@ func TestFirst(t *testing.T) {
 	r, err := First(p("one"), p("two"), p("test"), p("four"))
 	require.NoError(t, err)
 	require.Equal(t, p("test"), r)
-
 }
diff --git a/jukebox/jukebox.go b/jukebox/jukebox.go
index 3a04aa0..c29cfdc 100644
--- a/jukebox/jukebox.go
+++ b/jukebox/jukebox.go
@@ -331,13 +331,15 @@ func (j *Jukebox) getDecode(dest any, property string) error {
 	return nil
 }
 
-type mpvPlaylist []mpvPlaylistItem
-type mpvPlaylistItem struct {
-	ID       int
-	Filename string
-	Current  bool
-	Playing  bool
-}
+type (
+	mpvPlaylist     []mpvPlaylistItem
+	mpvPlaylistItem struct {
+		ID       int
+		Filename string
+		Current  bool
+		Playing  bool
+	}
+)
 
 func waitUntil(timeout time.Duration, f func() bool) bool {
 	quit := time.NewTicker(timeout)
diff --git a/jukebox/jukebox_test.go b/jukebox/jukebox_test.go
index c320d3e..f1c0f01 100644
--- a/jukebox/jukebox_test.go
+++ b/jukebox/jukebox_test.go
@@ -11,8 +11,10 @@ import (
 	"go.senan.xyz/gonic/jukebox"
 )
 
-func newJukebox(t *testing.T) *jukebox.Jukebox {
-	sockPath := filepath.Join(t.TempDir(), "mpv.sock")
+func newJukebox(tb testing.TB) *jukebox.Jukebox {
+	tb.Helper()
+
+	sockPath := filepath.Join(tb.TempDir(), "mpv.sock")
 
 	j := jukebox.New()
 	err := j.Start(
@@ -20,12 +22,12 @@ func newJukebox(t *testing.T) *jukebox.Jukebox {
 		[]string{jukebox.MPVArg("--ao", "null")},
 	)
 	if errors.Is(err, jukebox.ErrMPVTooOld) {
-		t.Skip("old mpv found, skipping")
+		tb.Skip("old mpv found, skipping")
 	}
 	if err != nil {
-		t.Fatalf("start jukebox: %v", err)
+		tb.Fatalf("start jukebox: %v", err)
 	}
-	t.Cleanup(func() {
+	tb.Cleanup(func() {
 		j.Quit()
 	})
 	return j
diff --git a/mime/mime.go b/mime/mime.go
index 04ffe56..8a9b533 100644
--- a/mime/mime.go
+++ b/mime/mime.go
@@ -28,9 +28,11 @@ func init() {
 	}
 }
 
-var TypeByExtension = stdmime.TypeByExtension
-var ParseMediaType = stdmime.ParseMediaType
-var FormatMediaType = stdmime.FormatMediaType
+var (
+	TypeByExtension = stdmime.TypeByExtension
+	ParseMediaType  = stdmime.ParseMediaType
+	FormatMediaType = stdmime.FormatMediaType
+)
 
 func TypeByAudioExtension(ext string) string {
 	if _, ok := supportedAudioTypes[strings.ToLower(ext)]; !ok {
diff --git a/mockfs/mockfs.go b/mockfs/mockfs.go
index d1711d8..de9383e 100644
--- a/mockfs/mockfs.go
+++ b/mockfs/mockfs.go
@@ -1,3 +1,4 @@
+//nolint:thelper
 package mockfs
 
 import (
@@ -27,29 +28,31 @@ type MockFS struct {
 	db        *db.DB
 }
 
-func New(t testing.TB) *MockFS                        { return newMockFS(t, []string{""}, "") }
-func NewWithDirs(t testing.TB, dirs []string) *MockFS { return newMockFS(t, dirs, "") }
-func NewWithExcludePattern(t testing.TB, excludePattern string) *MockFS {
-	return newMockFS(t, []string{""}, excludePattern)
+func New(tb testing.TB) *MockFS                        { return newMockFS(tb, []string{""}, "") }
+func NewWithDirs(tb testing.TB, dirs []string) *MockFS { return newMockFS(tb, dirs, "") }
+func NewWithExcludePattern(tb testing.TB, excludePattern string) *MockFS {
+	return newMockFS(tb, []string{""}, excludePattern)
 }
 
-func newMockFS(t testing.TB, dirs []string, excludePattern string) *MockFS {
+func newMockFS(tb testing.TB, dirs []string, excludePattern string) *MockFS {
+	tb.Helper()
+
 	dbc, err := db.NewMock()
 	if err != nil {
-		t.Fatalf("create db: %v", err)
+		tb.Fatalf("create db: %v", err)
 	}
-	t.Cleanup(func() {
+	tb.Cleanup(func() {
 		if err := dbc.Close(); err != nil {
-			t.Fatalf("close db: %v", err)
+			tb.Fatalf("close db: %v", err)
 		}
 	})
 
 	if err := dbc.Migrate(db.MigrationContext{}); err != nil {
-		t.Fatalf("migrate db db: %v", err)
+		tb.Fatalf("migrate db db: %v", err)
 	}
 	dbc.LogMode(false)
 
-	tmpDir := t.TempDir()
+	tmpDir := tb.TempDir()
 
 	var absDirs []string
 	for _, dir := range dirs {
@@ -57,7 +60,7 @@ func newMockFS(t testing.TB, dirs []string, excludePattern string) *MockFS {
 	}
 	for _, absDir := range absDirs {
 		if err := os.MkdirAll(absDir, os.ModePerm); err != nil {
-			t.Fatalf("mk abs dir: %v", err)
+			tb.Fatalf("mk abs dir: %v", err)
 		}
 	}
 
@@ -70,7 +73,7 @@ func newMockFS(t testing.TB, dirs []string, excludePattern string) *MockFS {
 	scanner := scanner.New(absDirs, dbc, multiValueSettings, tagReader, excludePattern)
 
 	return &MockFS{
-		t:         t,
+		t:         tb,
 		scanner:   scanner,
 		dir:       tmpDir,
 		tagReader: tagReader,
@@ -399,15 +402,6 @@ func (m *Tags) Bitrate() int { return firstInt(100, m.RawBitrate) }
 
 var _ tags.Parser = (*Tags)(nil)
 
-func first(or string, strs ...string) string {
-	for _, str := range strs {
-		if str != "" {
-			return str
-		}
-	}
-	return or
-}
-
 func firstInt(or int, ints ...int) int {
 	for _, int := range ints {
 		if int > 0 {
diff --git a/playlist/playlist.go b/playlist/playlist.go
index bb8dd91..618af33 100644
--- a/playlist/playlist.go
+++ b/playlist/playlist.go
@@ -14,9 +14,11 @@ import (
 	"time"
 )
 
-var ErrInvalidPathFormat = errors.New("invalid path format")
-var ErrInvalidBasePath = errors.New("invalid base path")
-var ErrNoUserPrefix = errors.New("no user prefix")
+var (
+	ErrInvalidPathFormat = errors.New("invalid path format")
+	ErrInvalidBasePath   = errors.New("invalid base path")
+	ErrNoUserPrefix      = errors.New("no user prefix")
+)
 
 const (
 	extM3U  = ".m3u"
@@ -31,7 +33,6 @@ type Store struct {
 func NewStore(basePath string) (*Store, error) {
 	if basePath == "" {
 		return nil, ErrInvalidBasePath
-
 	}
 
 	// sanity check layout, just in case someone tries to use an existing folder
@@ -108,6 +109,7 @@ const (
 func encodeAttr(name, value string) string {
 	return fmt.Sprintf("%s%s:%s", attrPrefix, name, strconv.Quote(value))
 }
+
 func decodeAttr(line string) (name, value string) {
 	if !strings.HasPrefix(line, attrPrefix) {
 		return "", ""
@@ -169,10 +171,10 @@ func (s *Store) Write(relPath string, playlist *Playlist) error {
 	defer lock(&s.mu)()
 
 	absPath := filepath.Join(s.basePath, relPath)
-	if err := os.MkdirAll(filepath.Dir(absPath), 0777); err != nil {
+	if err := os.MkdirAll(filepath.Dir(absPath), 0o777); err != nil {
 		return fmt.Errorf("make m3u base dir: %w", err)
 	}
-	file, err := os.OpenFile(absPath, os.O_RDWR|os.O_CREATE, 0666)
+	file, err := os.OpenFile(absPath, os.O_RDWR|os.O_CREATE, 0o666)
 	if err != nil {
 		return fmt.Errorf("create m3u: %w", err)
 	}
diff --git a/playlist/playlist_test.go b/playlist/playlist_test.go
index 52c1387..1d48dc5 100644
--- a/playlist/playlist_test.go
+++ b/playlist/playlist_test.go
@@ -8,6 +8,8 @@ import (
 )
 
 func TestPlaylist(t *testing.T) {
+	t.Parallel()
+
 	require := require.New(t)
 
 	tmp := t.TempDir()
diff --git a/podcasts/podcasts.go b/podcasts/podcasts.go
index 5fc02c9..e0c872f 100644
--- a/podcasts/podcasts.go
+++ b/podcasts/podcasts.go
@@ -25,8 +25,10 @@ import (
 
 var ErrNoAudioInFeedItem = errors.New("no audio in feed item")
 
-const downloadAllWaitInterval = 3 * time.Second
-const fetchUserAgent = `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11`
+const (
+	downloadAllWaitInterval = 3 * time.Second
+	fetchUserAgent          = `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11`
+)
 
 type Podcasts struct {
 	db      *db.DB
@@ -96,7 +98,6 @@ func (p *Podcasts) AddNewPodcast(rssURL string, feed *gofeed.Feed) (*db.Podcast,
 	rootDir, err := fileutil.Unique(filepath.Join(p.baseDir, fileutil.Safe(feed.Title)), "")
 	if err != nil {
 		return nil, fmt.Errorf("find unique podcast dir: %w", err)
-
 	}
 	podcast := db.Podcast{
 		Description: feed.Description,
@@ -105,7 +106,7 @@ func (p *Podcasts) AddNewPodcast(rssURL string, feed *gofeed.Feed) (*db.Podcast,
 		URL:         rssURL,
 		RootDir:     rootDir,
 	}
-	if err := os.Mkdir(podcast.RootDir, 0755); err != nil && !os.IsExist(err) {
+	if err := os.Mkdir(podcast.RootDir, 0o755); err != nil && !os.IsExist(err) {
 		return nil, err
 	}
 	if err := p.db.Save(&podcast).Error; err != nil {
@@ -248,7 +249,8 @@ func isAudio(rawItemURL string) (bool, error) {
 }
 
 func itemToEpisode(podcastID, size, duration int, audio string,
-	item *gofeed.Item) *db.PodcastEpisode {
+	item *gofeed.Item,
+) *db.PodcastEpisode {
 	return &db.PodcastEpisode{
 		PodcastID:   podcastID,
 		Description: item.Description,
diff --git a/podcasts/podcasts_test.go b/podcasts/podcasts_test.go
index dc4fc57..4042850 100644
--- a/podcasts/podcasts_test.go
+++ b/podcasts/podcasts_test.go
@@ -17,6 +17,8 @@ import (
 var testRSS []byte
 
 func TestPodcastsAndEpisodesWithSameName(t *testing.T) {
+	t.Parallel()
+
 	t.Skip("requires network access")
 
 	m := mockfs.New(t)
@@ -62,6 +64,8 @@ func TestPodcastsAndEpisodesWithSameName(t *testing.T) {
 }
 
 func TestGetMoreRecentEpisodes(t *testing.T) {
+	t.Parallel()
+
 	fp := gofeed.NewParser()
 	newFeed, err := fp.Parse(bytes.NewReader(testRSS))
 	if err != nil {
diff --git a/scanner/scanner.go b/scanner/scanner.go
index 9ac1914..d532231 100644
--- a/scanner/scanner.go
+++ b/scanner/scanner.go
@@ -61,9 +61,11 @@ func New(musicDirs []string, db *db.DB, multiValueSettings map[Tag]MultiValueSet
 func (s *Scanner) IsScanning() bool {
 	return atomic.LoadInt32(s.scanning) == 1
 }
+
 func (s *Scanner) StartScanning() bool {
 	return atomic.CompareAndSwapInt32(s.scanning, 0, 1)
 }
+
 func (s *Scanner) StopScanning() {
 	defer atomic.StoreInt32(s.scanning, 0)
 }
@@ -173,7 +175,6 @@ func (s *Scanner) ExecuteWatch() error {
 				if err != nil {
 					log.Printf("error walking: %v", err)
 				}
-
 			}
 			scanList = map[string]struct{}{}
 			s.StopScanning()
@@ -343,7 +344,7 @@ func (s *Scanner) populateTrackAndAlbumArtists(tx *db.DB, c *Context, i int, alb
 
 	trags, err := s.tagger.Read(absPath)
 	if err != nil {
-		return fmt.Errorf("%v: %w", err, ErrReadingTags)
+		return fmt.Errorf("%w: %w", err, ErrReadingTags)
 	}
 
 	genreNames := parseMulti(trags, s.multiValueSettings[Genre], tags.MustGenres, tags.MustGenre)
@@ -352,7 +353,7 @@ func (s *Scanner) populateTrackAndAlbumArtists(tx *db.DB, c *Context, i int, alb
 		return fmt.Errorf("populate genres: %w", err)
 	}
 
-	// metadata for the album table comes only from the the first track's tags
+	// metadata for the album table comes only from the first track's tags
 	if i == 0 {
 		albumArtistNames := parseMulti(trags, s.multiValueSettings[AlbumArtist], tags.MustAlbumArtists, tags.MustAlbumArtist)
 		var albumArtistIDs []int
@@ -510,7 +511,7 @@ func populateAlbumGenres(tx *db.DB, album *db.Album, genreIDs []int) error {
 
 func populateAlbumArtists(tx *db.DB, album *db.Album, albumArtistIDs []int) error {
 	if err := tx.Where("album_id=?", album.ID).Delete(db.AlbumArtist{}).Error; err != nil {
-		return fmt.Errorf("delete old album album artists: %w", err)
+		return fmt.Errorf("delete old album artists: %w", err)
 	}
 
 	if err := tx.InsertBulkLeftMany("album_artists", []string{"album_id", "artist_id"}, album.ID, albumArtistIDs); err != nil {
@@ -583,7 +584,7 @@ func (s *Scanner) cleanArtists(c *Context) error {
 	return nil
 }
 
-func (s *Scanner) cleanGenres(c *Context) error {
+func (s *Scanner) cleanGenres(c *Context) error { //nolint:unparam
 	start := time.Now()
 	defer func() { log.Printf("finished clean genres in %s, %d removed", durSince(start), c.GenresMissing()) }()
 
diff --git a/scanner/scanner_test.go b/scanner/scanner_test.go
index eb0aae2..032dbae 100644
--- a/scanner/scanner_test.go
+++ b/scanner/scanner_test.go
@@ -1,4 +1,4 @@
-//nolint:goconst
+//nolint:goconst,errorlint
 package scanner_test
 
 import (
@@ -724,7 +724,6 @@ func TestMultiArtistSupport(t *testing.T) {
 		},
 		state(),
 	)
-
 }
 
 func TestMultiArtistPreload(t *testing.T) {
diff --git a/scanner/tags/tags.go b/scanner/tags/tags.go
index bfd0b3a..660b6a5 100644
--- a/scanner/tags/tags.go
+++ b/scanner/tags/tags.go
@@ -34,9 +34,11 @@ func (t *Tagger) Genres() []string       { return find(t.raw, "genres") }
 func (t *Tagger) TrackNumber() int {
 	return intSep("/" /* eg. 5/12 */, first(find(t.raw, "tracknumber")))
 }
+
 func (t *Tagger) DiscNumber() int {
 	return intSep("/" /* eg. 1/2  */, first(find(t.raw, "discnumber")))
 }
+
 func (t *Tagger) Year() int {
 	return intSep("-" /* 2023-12-01 */, first(find(t.raw, "originaldate", "date", "year")))
 }
@@ -65,15 +67,6 @@ type Parser interface {
 	Year() int
 }
 
-func fallback(or string, strs ...string) string {
-	for _, str := range strs {
-		if str != "" {
-			return str
-		}
-	}
-	return or
-}
-
 func first[T comparable](is []T) T {
 	var z T
 	for _, i := range is {
diff --git a/scrobble/lastfm/client_test.go b/scrobble/lastfm/client_test.go
index 58df4c7..8a51a8f 100644
--- a/scrobble/lastfm/client_test.go
+++ b/scrobble/lastfm/client_test.go
@@ -13,6 +13,8 @@ import (
 )
 
 func TestArtistGetInfo(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -93,6 +95,8 @@ func TestArtistGetInfo(t *testing.T) {
 }
 
 func TestArtistGetInfoClientRequestFails(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -117,6 +121,8 @@ func TestArtistGetInfoClientRequestFails(t *testing.T) {
 }
 
 func TestArtistGetTopTracks(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -185,6 +191,8 @@ func TestArtistGetTopTracks(t *testing.T) {
 }
 
 func TestArtistGetTopTracks_clientRequestFails(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -209,6 +217,8 @@ func TestArtistGetTopTracks_clientRequestFails(t *testing.T) {
 }
 
 func TestArtistGetSimilar(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -285,6 +295,8 @@ func TestArtistGetSimilar(t *testing.T) {
 }
 
 func TestArtistGetSimilar_clientRequestFails(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -309,6 +321,8 @@ func TestArtistGetSimilar_clientRequestFails(t *testing.T) {
 }
 
 func TestTrackGetSimilarTracks(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -375,6 +389,8 @@ func TestTrackGetSimilarTracks(t *testing.T) {
 }
 
 func TestTrackGetSimilarTracks_clientRequestFails(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -400,6 +416,8 @@ func TestTrackGetSimilarTracks_clientRequestFails(t *testing.T) {
 }
 
 func TestGetSession(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -426,6 +444,8 @@ func TestGetSession(t *testing.T) {
 }
 
 func TestGetSessioeClientRequestFails(t *testing.T) {
+	t.Parallel()
+
 	// arrange
 	require := require.New(t)
 	client := Client{mockclient.New(t, func(w http.ResponseWriter, r *http.Request) {
@@ -451,6 +471,8 @@ func TestGetSessioeClientRequestFails(t *testing.T) {
 }
 
 func TestGetParamSignature(t *testing.T) {
+	t.Parallel()
+
 	params := url.Values{}
 	params.Add("ccc", "CCC")
 	params.Add("bbb", "BBB")
diff --git a/scrobble/lastfm/mockclient/mockclient.go b/scrobble/lastfm/mockclient/mockclient.go
index 2e3f8cf..593e656 100644
--- a/scrobble/lastfm/mockclient/mockclient.go
+++ b/scrobble/lastfm/mockclient/mockclient.go
@@ -10,9 +10,11 @@ import (
 	"testing"
 )
 
-func New(t testing.TB, handler http.HandlerFunc) *http.Client {
+func New(tb testing.TB, handler http.HandlerFunc) *http.Client {
+	tb.Helper()
+
 	server := httptest.NewTLSServer(handler)
-	t.Cleanup(server.Close)
+	tb.Cleanup(server.Close)
 
 	return &http.Client{
 		Transport: &http.Transport{
diff --git a/scrobble/listenbrainz/listenbrainz.go b/scrobble/listenbrainz/listenbrainz.go
index 0e5affb..872fbf1 100644
--- a/scrobble/listenbrainz/listenbrainz.go
+++ b/scrobble/listenbrainz/listenbrainz.go
@@ -23,9 +23,7 @@ const (
 	listenTypePlayingNow = "playing_now"
 )
 
-var (
-	ErrListenBrainz = errors.New("listenbrainz error")
-)
+var ErrListenBrainz = errors.New("listenbrainz error")
 
 type Scrobbler struct {
 	httpClient *http.Client
diff --git a/server/ctrladmin/ctrl.go b/server/ctrladmin/ctrl.go
index a374349..31506c9 100644
--- a/server/ctrladmin/ctrl.go
+++ b/server/ctrladmin/ctrl.go
@@ -1,4 +1,3 @@
-// Package ctrladmin provides HTTP handlers for admin UI
 package ctrladmin
 
 import (
diff --git a/server/ctrlbase/ctrl.go b/server/ctrlbase/ctrl.go
index 7d8e1b5..00d854b 100644
--- a/server/ctrlbase/ctrl.go
+++ b/server/ctrlbase/ctrl.go
@@ -5,6 +5,7 @@ import (
 	"log"
 	"net/http"
 	"path"
+	"strings"
 
 	"go.senan.xyz/gonic/db"
 	"go.senan.xyz/gonic/playlist"
@@ -94,15 +95,20 @@ func (c *Controller) WithLogging(next http.Handler) http.Handler {
 }
 
 func (c *Controller) WithCORS(next http.Handler) http.Handler {
+	allowMethods := strings.Join(
+		[]string{http.MethodPost, http.MethodGet, http.MethodOptions, http.MethodPut, http.MethodDelete},
+		", ",
+	)
+	allowHeaders := strings.Join(
+		[]string{"Accept", "Content-Type", "Content-Length", "Accept-Encoding", "X-CSRF-Token", "Authorization"},
+		", ",
+	)
+
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Access-Control-Allow-Origin", "*")
-		w.Header().Set("Access-Control-Allow-Methods",
-			"POST, GET, OPTIONS, PUT, DELETE",
-		)
-		w.Header().Set("Access-Control-Allow-Headers",
-			"Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization",
-		)
-		if r.Method == "OPTIONS" {
+		w.Header().Set("Access-Control-Allow-Methods", allowMethods)
+		w.Header().Set("Access-Control-Allow-Headers", allowHeaders)
+		if r.Method == http.MethodOptions {
 			return
 		}
 		next.ServeHTTP(w, r)
diff --git a/server/ctrlsubsonic/artistinfocache/artistinfocache_test.go b/server/ctrlsubsonic/artistinfocache/artistinfocache_test.go
index 29e923e..4c272ae 100644
--- a/server/ctrlsubsonic/artistinfocache/artistinfocache_test.go
+++ b/server/ctrlsubsonic/artistinfocache/artistinfocache_test.go
@@ -15,6 +15,8 @@ import (
 )
 
 func TestInfoCache(t *testing.T) {
+	t.Parallel()
+
 	m := mockfs.New(t)
 	m.AddItems()
 	m.ScanAndClean()
diff --git a/server/ctrlsubsonic/ctrl.go b/server/ctrlsubsonic/ctrl.go
index 7fc9234..889eb56 100644
--- a/server/ctrlsubsonic/ctrl.go
+++ b/server/ctrlsubsonic/ctrl.go
@@ -1,4 +1,3 @@
-// Package ctrlsubsonic provides HTTP handlers for subsonic API
 package ctrlsubsonic
 
 import (
diff --git a/server/ctrlsubsonic/ctrl_test.go b/server/ctrlsubsonic/ctrl_test.go
index 02541e8..05f5f90 100644
--- a/server/ctrlsubsonic/ctrl_test.go
+++ b/server/ctrlsubsonic/ctrl_test.go
@@ -1,3 +1,4 @@
+//nolint:thelper
 package ctrlsubsonic
 
 import (
@@ -80,7 +81,10 @@ func makeHTTPMockWithAdmin(query url.Values) (*httptest.ResponseRecorder, *http.
 func runQueryCases(t *testing.T, contr *Controller, h handlerSubsonic, cases []*queryCase) {
 	t.Helper()
 	for _, qc := range cases {
+		qc := qc
 		t.Run(qc.expectPath, func(t *testing.T) {
+			t.Parallel()
+
 			rr, req := makeHTTPMock(qc.params)
 			contr.H(h).ServeHTTP(rr, req)
 			body := rr.Body.String()
@@ -91,7 +95,7 @@ func runQueryCases(t *testing.T, contr *Controller, h handlerSubsonic, cases []*
 			goldenPath := makeGoldenPath(t.Name())
 			goldenRegen := os.Getenv("GONIC_REGEN")
 			if goldenRegen == "*" || (goldenRegen != "" && strings.HasPrefix(t.Name(), goldenRegen)) {
-				_ = os.WriteFile(goldenPath, []byte(body), 0600)
+				_ = os.WriteFile(goldenPath, []byte(body), 0o600)
 				t.Logf("golden file %q regenerated for %s", goldenPath, t.Name())
 				t.SkipNow()
 			}
@@ -120,14 +124,13 @@ func runQueryCases(t *testing.T, contr *Controller, h handlerSubsonic, cases []*
 	}
 }
 
-func makeController(t *testing.T) *Controller                  { return makec(t, []string{""}, false) }
-func makeControllerRoots(t *testing.T, r []string) *Controller { return makec(t, r, false) }
-func makeControllerAudio(t *testing.T) *Controller             { return makec(t, []string{""}, true) }
+func makeController(tb testing.TB) *Controller                  { return makec(tb, []string{""}, false) }
+func makeControllerRoots(tb testing.TB, r []string) *Controller { return makec(tb, r, false) }
 
-func makec(t *testing.T, roots []string, audio bool) *Controller {
-	t.Helper()
+func makec(tb testing.TB, roots []string, audio bool) *Controller {
+	tb.Helper()
 
-	m := mockfs.NewWithDirs(t, roots)
+	m := mockfs.NewWithDirs(tb, roots)
 	for _, root := range roots {
 		m.AddItemsPrefixWithCovers(root)
 		if !audio {
diff --git a/server/ctrlsubsonic/handlers_by_folder.go b/server/ctrlsubsonic/handlers_by_folder.go
index 677dbfb..ed7cb2d 100644
--- a/server/ctrlsubsonic/handlers_by_folder.go
+++ b/server/ctrlsubsonic/handlers_by_folder.go
@@ -115,7 +115,7 @@ func (c *Controller) ServeGetMusicDirectory(r *http.Request) *spec.Response {
 }
 
 // ServeGetAlbumList handles the getAlbumList view.
-// changes to this function should be reflected in in _by_tags.go's
+// changes to this function should be reflected in _by_tags.go's
 // getAlbumListTwo() function
 func (c *Controller) ServeGetAlbumList(r *http.Request) *spec.Response {
 	params := r.Context().Value(CtxParams).(params.Params)
@@ -130,8 +130,7 @@ func (c *Controller) ServeGetAlbumList(r *http.Request) *spec.Response {
 	case "alphabeticalByName":
 		q = q.Order("right_path")
 	case "byYear":
-		y1, y2 :=
-			params.GetOrInt("fromYear", 1800),
+		y1, y2 := params.GetOrInt("fromYear", 1800),
 			params.GetOrInt("toYear", 2200)
 		// support some clients sending wrong order like DSub
 		q = q.Where("tag_year BETWEEN ? AND ?", min(y1, y2), max(y1, y2))
diff --git a/server/ctrlsubsonic/handlers_by_folder_test.go b/server/ctrlsubsonic/handlers_by_folder_test.go
index 4d6208c..27de6ad 100644
--- a/server/ctrlsubsonic/handlers_by_folder_test.go
+++ b/server/ctrlsubsonic/handlers_by_folder_test.go
@@ -8,6 +8,8 @@ import (
 )
 
 func TestGetIndexes(t *testing.T) {
+	t.Parallel()
+
 	contr := makeControllerRoots(t, []string{"m-0", "m-1"})
 
 	runQueryCases(t, contr, contr.ServeGetIndexes, []*queryCase{
@@ -18,6 +20,8 @@ func TestGetIndexes(t *testing.T) {
 }
 
 func TestGetMusicDirectory(t *testing.T) {
+	t.Parallel()
+
 	contr := makeController(t)
 
 	runQueryCases(t, contr, contr.ServeGetMusicDirectory, []*queryCase{
diff --git a/server/ctrlsubsonic/handlers_by_tags.go b/server/ctrlsubsonic/handlers_by_tags.go
index 3612d94..4ffb7e6 100644
--- a/server/ctrlsubsonic/handlers_by_tags.go
+++ b/server/ctrlsubsonic/handlers_by_tags.go
@@ -130,7 +130,7 @@ func (c *Controller) ServeGetAlbum(r *http.Request) *spec.Response {
 }
 
 // ServeGetAlbumListTwo handles the getAlbumList2 view.
-// changes to this function should be reflected in in _by_folder.go's
+// changes to this function should be reflected in _by_folder.go's
 // getAlbumList() function
 func (c *Controller) ServeGetAlbumListTwo(r *http.Request) *spec.Response {
 	params := r.Context().Value(CtxParams).(params.Params)
@@ -147,8 +147,7 @@ func (c *Controller) ServeGetAlbumListTwo(r *http.Request) *spec.Response {
 	case "alphabeticalByName":
 		q = q.Order("tag_title")
 	case "byYear":
-		y1, y2 :=
-			params.GetOrInt("fromYear", 1800),
+		y1, y2 := params.GetOrInt("fromYear", 1800),
 			params.GetOrInt("toYear", 2200)
 		// support some clients sending wrong order like DSub
 		q = q.Where("tag_year BETWEEN ? AND ?", min(y1, y2), max(y1, y2))
diff --git a/server/ctrlsubsonic/handlers_internet_radio_test.go b/server/ctrlsubsonic/handlers_internet_radio_test.go
index 18a0b4f..cd8c028 100644
--- a/server/ctrlsubsonic/handlers_internet_radio_test.go
+++ b/server/ctrlsubsonic/handlers_internet_radio_test.go
@@ -1,7 +1,9 @@
+//nolint:tparallel,paralleltest,thelper
 package ctrlsubsonic
 
 import (
 	"encoding/json"
+	"errors"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -37,8 +39,10 @@ const (
 	newstation1HomepageURL = "https://www.kcrw.com/music/shows/eclectic24"
 )
 
-const newstation2StreamURL = "http://media.kcrw.com/pls/kcrwsantabarbara.pls"
-const newstation2Name = "KCRW Santa Barbara"
+const (
+	newstation2StreamURL = "http://media.kcrw.com/pls/kcrwsantabarbara.pls"
+	newstation2Name      = "KCRW Santa Barbara"
+)
 
 const station3ID = "ir-3"
 
@@ -48,16 +52,18 @@ func TestInternetRadio(t *testing.T) {
 	t.Parallel()
 
 	contr := makeController(t)
-	t.Run("TestInternetRadioInitialEmpty", func(t *testing.T) { testInternetRadioInitialEmpty(t, contr) })
-	t.Run("TestInternetRadioBadCreates", func(t *testing.T) { testInternetRadioBadCreates(t, contr) })
-	t.Run("TestInternetRadioInitialAdds", func(t *testing.T) { testInternetRadioInitialAdds(t, contr) })
-	t.Run("TestInternetRadioUpdateHomepage", func(t *testing.T) { testInternetRadioUpdateHomepage(t, contr) })
-	t.Run("TestInternetRadioNotAdmin", func(t *testing.T) { testInternetRadioNotAdmin(t, contr) })
-	t.Run("TestInternetRadioUpdates", func(t *testing.T) { testInternetRadioUpdates(t, contr) })
-	t.Run("TestInternetRadioDeletes", func(t *testing.T) { testInternetRadioDeletes(t, contr) })
+	t.Run("initial empty", func(t *testing.T) { testInternetRadioInitialEmpty(t, contr) })
+	t.Run("bad creates", func(t *testing.T) { testInternetRadioBadCreates(t, contr) })
+	t.Run("initial adds", func(t *testing.T) { testInternetRadioInitialAdds(t, contr) })
+	t.Run("update home page", func(t *testing.T) { testInternetRadioUpdateHomepage(t, contr) })
+	t.Run("not admin", func(t *testing.T) { testInternetRadioNotAdmin(t, contr) })
+	t.Run("updates", func(t *testing.T) { testInternetRadioUpdates(t, contr) })
+	t.Run("deletes", func(t *testing.T) { testInternetRadioDeletes(t, contr) })
 }
 
 func runTestCase(t *testing.T, contr *Controller, h handlerSubsonic, q url.Values, admin bool) *spec.SubsonicResponse {
+	t.Helper()
+
 	var rr *httptest.ResponseRecorder
 	var req *http.Request
 
@@ -74,18 +80,17 @@ func runTestCase(t *testing.T, contr *Controller, h handlerSubsonic, q url.Value
 
 	var response spec.SubsonicResponse
 	if err := json.Unmarshal(rr.Body.Bytes(), &response); err != nil {
-		switch ty := err.(type) {
-		case *json.SyntaxError:
-			jsn := body[0:ty.Offset]
-			jsn += "<--(Invalid Character)"
-			t.Fatalf("invalid character at offset %v\n %s", ty.Offset, jsn)
-		case *json.UnmarshalTypeError:
-			jsn := body[0:ty.Offset]
-			jsn += "<--(Invalid Type)"
-			t.Fatalf("invalid type at offset %v\n %s", ty.Offset, jsn)
-		default:
-			t.Fatalf("json unmarshal failed: %s", err.Error())
+		var jsonSyntaxError *json.SyntaxError
+		if errors.As(err, &jsonSyntaxError) {
+			t.Fatalf("invalid character at offset %v\n %s <--", jsonSyntaxError.Offset, body[0:jsonSyntaxError.Offset])
 		}
+
+		var jsonUnmarshalTypeError *json.UnmarshalTypeError
+		if errors.As(err, &jsonSyntaxError) {
+			t.Fatalf("invalid type at offset %v\n %s <--", jsonUnmarshalTypeError.Offset, body[0:jsonUnmarshalTypeError.Offset])
+		}
+
+		t.Fatalf("json unmarshal failed: %v", err)
 	}
 
 	return &response
diff --git a/server/ctrlsubsonic/handlers_playlist.go b/server/ctrlsubsonic/handlers_playlist.go
index ac73242..1b240ce 100644
--- a/server/ctrlsubsonic/handlers_playlist.go
+++ b/server/ctrlsubsonic/handlers_playlist.go
@@ -180,6 +180,7 @@ func (c *Controller) ServeDeletePlaylist(r *http.Request) *spec.Response {
 func playlistIDEncode(path string) string {
 	return base64.URLEncoding.EncodeToString([]byte(path))
 }
+
 func playlistIDDecode(id string) string {
 	path, _ := base64.URLEncoding.DecodeString(id)
 	return string(path)
diff --git a/server/ctrlsubsonic/handlers_raw.go b/server/ctrlsubsonic/handlers_raw.go
index 21718f4..d39f241 100644
--- a/server/ctrlsubsonic/handlers_raw.go
+++ b/server/ctrlsubsonic/handlers_raw.go
@@ -62,8 +62,6 @@ func streamGetTranscodeMeta(dbc *db.DB, userID int, client string) spec.Transcod
 	}
 }
 
-var errUnknownMediaType = fmt.Errorf("media type is unknown")
-
 func streamUpdateStats(dbc *db.DB, userID int, track *db.Track, playTime time.Time) error {
 	var play db.Play
 	err := dbc.
diff --git a/server/ctrlsubsonic/params/params.go b/server/ctrlsubsonic/params/params.go
index 93312ce..bb4658f 100644
--- a/server/ctrlsubsonic/params/params.go
+++ b/server/ctrlsubsonic/params/params.go
@@ -35,9 +35,7 @@ import (
 	"go.senan.xyz/gonic/server/ctrlsubsonic/specid"
 )
 
-var (
-	ErrNoValues = errors.New("no values provided")
-)
+var ErrNoValues = errors.New("no values provided")
 
 // some thin wrappers
 // may be needed when cleaning up parse() below
@@ -62,7 +60,6 @@ func parse(values []string, i interface{}) error {
 	}
 	var err error
 	switch v := i.(type) {
-
 	// *T
 	case *string:
 		*v, err = parseStr(values[0])
diff --git a/server/ctrlsubsonic/specid/ids.go b/server/ctrlsubsonic/specid/ids.go
index 75c6496..7bc0469 100644
--- a/server/ctrlsubsonic/specid/ids.go
+++ b/server/ctrlsubsonic/specid/ids.go
@@ -30,18 +30,17 @@ const (
 	separator                = "-"
 )
 
+//nolint:musttag
 type ID struct {
 	Type  IDT
 	Value int
 }
 
 func New(in string) (ID, error) {
-	parts := strings.Split(in, separator)
-	if len(parts) != 2 {
+	partType, partValue, ok := strings.Cut(in, separator)
+	if !ok {
 		return ID{}, ErrBadSeparator
 	}
-	partType := parts[0]
-	partValue := parts[1]
 	val, err := strconv.Atoi(partValue)
 	if err != nil {
 		return ID{}, fmt.Errorf("%q: %w", partValue, ErrNotAnInt)
diff --git a/server/ctrlsubsonic/specid/ids_test.go b/server/ctrlsubsonic/specid/ids_test.go
index fadd3ff..d3e5303 100644
--- a/server/ctrlsubsonic/specid/ids_test.go
+++ b/server/ctrlsubsonic/specid/ids_test.go
@@ -6,6 +6,8 @@ import (
 )
 
 func TestParseID(t *testing.T) {
+	t.Parallel()
+
 	tcases := []struct {
 		param    string
 		expType  IDT
@@ -20,9 +22,12 @@ func TestParseID(t *testing.T) {
 		{param: "1", expErr: ErrBadSeparator},
 		{param: "al-howdy", expErr: ErrNotAnInt},
 	}
+
 	for _, tcase := range tcases {
 		tcase := tcase // pin
 		t.Run(tcase.param, func(t *testing.T) {
+			t.Parallel()
+
 			act, err := New(tcase.param)
 			if !errors.Is(err, tcase.expErr) {
 				t.Fatalf("expected err %q, got %q", tcase.expErr, err)
diff --git a/server/ctrlsubsonic/specidpaths/specidpaths.go b/server/ctrlsubsonic/specidpaths/specidpaths.go
index ecb05f1..c054ee1 100644
--- a/server/ctrlsubsonic/specidpaths/specidpaths.go
+++ b/server/ctrlsubsonic/specidpaths/specidpaths.go
@@ -9,8 +9,10 @@ import (
 	"go.senan.xyz/gonic/server/ctrlsubsonic/specid"
 )
 
-var ErrNotAbs = errors.New("not abs")
-var ErrNotFound = errors.New("not found")
+var (
+	ErrNotAbs   = errors.New("not abs")
+	ErrNotFound = errors.New("not found")
+)
 
 type Result interface {
 	SID() *specid.ID
diff --git a/transcode/transcoder_caching.go b/transcode/transcoder_caching.go
index 8695e7a..f1043b2 100644
--- a/transcode/transcoder_caching.go
+++ b/transcode/transcoder_caching.go
@@ -9,7 +9,7 @@ import (
 	"path/filepath"
 )
 
-const perm = 0644
+const perm = 0o644
 
 type CachingTranscoder struct {
 	cachePath  string
@@ -23,7 +23,7 @@ func NewCachingTranscoder(t Transcoder, cachePath string) *CachingTranscoder {
 }
 
 func (t *CachingTranscoder) Transcode(ctx context.Context, profile Profile, in string, out io.Writer) error {
-	if err := os.MkdirAll(t.cachePath, perm^0111); err != nil {
+	if err := os.MkdirAll(t.cachePath, perm^0o111); err != nil {
 		return fmt.Errorf("make cache path: %w", err)
 	}
 
@@ -35,7 +35,7 @@ func (t *CachingTranscoder) Transcode(ctx context.Context, profile Profile, in s
 	key := cacheKey(name, args)
 	path := filepath.Join(t.cachePath, key)
 
-	cf, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0644)
+	cf, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0o644)
 	if err != nil {
 		return fmt.Errorf("open cache file: %w", err)
 	}
diff --git a/transcode/transcoder_ffmpeg.go b/transcode/transcoder_ffmpeg.go
index f0a471b..f71b13e 100644
--- a/transcode/transcoder_ffmpeg.go
+++ b/transcode/transcoder_ffmpeg.go
@@ -16,8 +16,10 @@ func NewFFmpegTranscoder() *FFmpegTranscoder {
 	return &FFmpegTranscoder{}
 }
 
-var ErrFFmpegKilled = fmt.Errorf("ffmpeg was killed early")
-var ErrFFmpegExit = fmt.Errorf("ffmpeg exited with non 0 status code")
+var (
+	ErrFFmpegKilled = fmt.Errorf("ffmpeg was killed early")
+	ErrFFmpegExit   = fmt.Errorf("ffmpeg exited with non 0 status code")
+)
 
 func (*FFmpegTranscoder) Transcode(ctx context.Context, profile Profile, in string, out io.Writer) error {
 	name, args, err := parseProfile(profile, in)
@@ -36,7 +38,7 @@ func (*FFmpegTranscoder) Transcode(ctx context.Context, profile Profile, in stri
 
 	switch err := cmd.Wait(); {
 	case errors.As(err, &exitErr):
-		return fmt.Errorf("waiting cmd: %v: %w", err, ErrFFmpegKilled)
+		return fmt.Errorf("waiting cmd: %w: %w", err, ErrFFmpegKilled)
 	case err != nil:
 		return fmt.Errorf("waiting cmd: %w", err)
 	}
diff --git a/version.go b/version.go
index b23a444..06c99af 100644
--- a/version.go
+++ b/version.go
@@ -10,5 +10,7 @@ import (
 var version string
 var Version = strings.TrimSpace(version)
 
-const Name = "gonic"
-const NameUpper = "GONIC"
+const (
+	Name      = "gonic"
+	NameUpper = "GONIC"
+)