Chore: Enable golangci-lint

Add a GitHub actions workflow to run golangci-lint.

Signed-off-by: SuperQ <superq@gmail.com>

.github/workflows/golangci-lint.yml

@@ -0,0 +1,34 @@
+---
+name: golangci-lint
+on:
+  push:
+    paths:
+      - "go.sum"
+      - "go.mod"
+      - "**.go"
+      - ".github/workflows/golangci-lint.yml"
+      - ".golangci.yml"
+  pull_request:
+
+permissions:  # added using https://github.com/step-security/secure-repo
+  contents: read
+
+jobs:
+  golangci:
+    permissions:
+      contents: read  # for actions/checkout to fetch code
+      pull-requests: read  # for golangci/golangci-lint-action to fetch pull requests
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: Install Go
+        uses: actions/setup-go@41dfa10bad2bb2ae585af6ee5bb4d7d973ad74ed # v5.1.0
+        with:
+          go-version: 1.23.x
+      - name: Lint
+        uses: golangci/golangci-lint-action@971e284b6050e8a5849b72094c50ab08da042db8 # v6.1.1
+        with:
+          args: --verbose
+          version: v1.62.0

.golangci.yml

@@ -0,0 +1,12 @@
+---
+linters:
+  enable:
+  # - goimports
+  # - misspell
+  # - revive
+
+issues:
+  exclude-rules:
+    - path: _test.go
+      linters:
+        - errcheck

display.go

@@ -211,7 +211,7 @@ func startBacklightTickers() {
 	// Don't start the tickers if the display is switched off.
 	// Set the display to off if that's the case.
 	if config.DisplayMaxBrightness == 0 {
-		setDisplayBrightness(0)
+		_ = setDisplayBrightness(0)
 		return
 	}
 
@@ -221,7 +221,7 @@ func startBacklightTickers() {
 		defer dimTicker.Stop()
 
 		go func() {
-			for {
+			for { //nolint:gosimple
 				select {
 				case <-dimTicker.C:
 					tick_displayDim()
@@ -236,7 +236,7 @@ func startBacklightTickers() {
 		defer offTicker.Stop()
 
 		go func() {
-			for {
+			for { //nolint:gosimple
 				select {
 				case <-offTicker.C:
 					tick_displayOff()

go.mod

@@ -15,7 +15,6 @@ require (
 	github.com/gwatts/rootcerts v0.0.0-20240401182218-3ab9db955caf
 	github.com/hanwen/go-fuse/v2 v2.5.1
 	github.com/hashicorp/go-envparse v0.1.0
-	github.com/openstadia/go-usb-gadget v0.0.0-20231115171102-aebd56bbb965
 	github.com/pion/logging v0.2.2
 	github.com/pion/mdns/v2 v2.0.7
 	github.com/pion/webrtc/v4 v4.0.0

go.sum

@@ -87,8 +87,6 @@ github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9G
 github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
-github.com/openstadia/go-usb-gadget v0.0.0-20231115171102-aebd56bbb965 h1:bZGtUfkOl0dqvem8ltx9KCYied0gSlRuDhaZDxgppN4=
-github.com/openstadia/go-usb-gadget v0.0.0-20231115171102-aebd56bbb965/go.mod h1:6cAIK2c4O3/yETSrRjmNwsBL3yE4Vcu9M9p/Qwx5+gM=
 github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
 github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
 github.com/pilebones/go-udev v0.9.0 h1:N1uEO/SxUwtIctc0WLU0t69JeBxIYEYnj8lT/Nabl9Q=

jsonrpc.go

@@ -195,8 +195,7 @@ func rpcSetEDID(edid string) error {
 
 	// Save EDID to config, allowing it to be restored on reboot.
 	config.EdidString = edid
-	SaveConfig()
+	_ = SaveConfig()
-
 	return nil
 }
 
@@ -596,18 +595,18 @@ func rpcSetActiveExtension(extensionId string) error {
 		return nil
 	}
 	if config.ActiveExtension == "atx-power" {
-		unmountATXControl()
+		_ = unmountATXControl()
 	} else if config.ActiveExtension == "dc-power" {
-		unmountDCControl()
+		_ = unmountDCControl()
 	}
 	config.ActiveExtension = extensionId
 	if err := SaveConfig(); err != nil {
 		return fmt.Errorf("failed to save config: %w", err)
 	}
 	if extensionId == "atx-power" {
-		mountATXControl()
+		_ = mountATXControl()
 	} else if extensionId == "dc-power" {
-		mountDCControl()
+		_ = mountDCControl()
 	}
 	return nil
 }
@@ -728,7 +727,7 @@ func rpcSetSerialSettings(settings SerialSettings) error {
 		Parity:   parity,
 	}
 
-	port.SetMode(serialPortMode)
+	_ = port.SetMode(serialPortMode)
 
 	return nil
 }

network.go

@@ -107,7 +107,7 @@ func checkNetworkState() {
 	if newState != networkState {
 		logger.Info("network state changed")
 		// restart MDNS
-		startMDNS()
+		_ = startMDNS()
 		networkState = newState
 		requestDisplayUpdate()
 	}

ntp.go

@@ -20,7 +20,6 @@ const (
 )
 
 var (
-	timeSynced            = false
 	timeSyncRetryInterval = 0 * time.Second
 	defaultNTPServers     = []string{
 		"time.cloudflare.com",
@@ -58,7 +57,6 @@ func TimeSyncLoop() {
 			continue
 		}
 		logger.Infof("Time sync successful, now is: %v, time taken: %v", time.Now(), time.Since(start))
-		timeSynced = true
 		time.Sleep(timeSyncInterval) // after the first sync is done
 	}
 }

serial.go

@@ -16,14 +16,14 @@ const serialPortPath = "/dev/ttyS3"
 var port serial.Port
 
 func mountATXControl() error {
-	port.SetMode(defaultMode)
+	_ = port.SetMode(defaultMode)
 	go runATXControl()
 
 	return nil
 }
 
 func unmountATXControl() error {
-	reopenSerialPort()
+	_ = reopenSerialPort()
 	return nil
 }
 
@@ -122,13 +122,13 @@ func pressATXResetButton(duration time.Duration) error {
 }
 
 func mountDCControl() error {
-	port.SetMode(defaultMode)
+	_ = port.SetMode(defaultMode)
 	go runDCControl()
 	return nil
 }
 
 func unmountDCControl() error {
-	reopenSerialPort()
+	_ = reopenSerialPort()
 	return nil
 }
 
@@ -212,11 +212,11 @@ var defaultMode = &serial.Mode{
 }
 
 func initSerialPort() {
-	reopenSerialPort()
+	_ = reopenSerialPort()
 	if config.ActiveExtension == "atx-power" {
-		mountATXControl()
+		_ = mountATXControl()
 	} else if config.ActiveExtension == "dc-power" {
-		mountDCControl()
+		_ = mountDCControl()
 	}
 }