fix golangci-lint errors

Signed-off-by: Steffen Vogel <post@steffenvogel.de>

go.mod

@@ -92,3 +92,5 @@ require (
 	kernel.org/pub/linux/libs/security/libcap/psx v1.2.69 // indirect
 	rsc.io/qr v0.2.0 // indirect
 )
+
+// replace github.com/stv0g/gont/v2 => ../gont

pkg/daemon/feature/epdisc/peer.go

@@ -31,6 +31,7 @@ var (
 	errSwitchToIdle                     = errors.New("failed to switch to idle state")
 	errStillIdle                        = errors.New("not connected yet")
 	errClosing                          = errors.New("already closing")
+	errInvalidConnectionStateForRestart = errors.New("can not restart agent while in state")
 )
 
 type Peer struct {
@@ -235,7 +236,7 @@ func (p *Peer) Restart() error {
 	invalidRestartStates := []ConnectionState{ConnectionStateClosed, ConnectionStateClosing, ConnectionStateRestarting}
 
 	if prev, ok := p.connectionState.SetIfNot(ConnectionStateRestarting, invalidRestartStates...); !ok {
-		return fmt.Errorf("can not restart agent while in state: %s", strings.ToLower(prev.String()))
+		return fmt.Errorf("%w: %s", errInvalidConnectionStateForRestart, strings.ToLower(prev.String()))
 	}
 
 	p.logger.Debug("Restarting ICE session")

pkg/device/device_kernel.go

@@ -12,6 +12,8 @@ import (
 	wgdevice "golang.zx2c4.com/wireguard/device"
 )
 
+var errNotWireGuardLink = errors.New("link is not a WireGuard link")
+
 type KernelDevice struct {
 	link.Link
 
@@ -52,7 +54,7 @@ func FindKernelDevice(name string) (*KernelDevice, error) {
 
 	// TODO: Is this portable?
 	if lnk.Type() != link.TypeWireGuard {
-		return nil, fmt.Errorf("link '%s' is not a WireGuard link", lnk.Name())
+		return nil, fmt.Errorf("%w: %s", errNotWireGuardLink, lnk.Name())
 	}
 
 	return &KernelDevice{

pkg/rpc/client.go

@@ -94,7 +94,7 @@ func Connect(path string) (*Client, error) {
 }
 
 func (c *Client) Close() error {
-	if err := c.conn.Close(); err != nil && !errors.Is(err, grpc.ErrClientConnClosing) {
+	if err := c.conn.Close(); err != nil && status.Code(err) != codes.Canceled {
 		return fmt.Errorf("failed to close gRPC client connection: %w", err)
 	}
 

pkg/signaling/grpc/backend.go

@@ -2,7 +2,6 @@ package grpc
 
 import (
 	"context"
-	"errors"
 	"fmt"
 
 	"github.com/stv0g/cunicu/pkg/crypto"
@@ -11,6 +10,8 @@ import (
 	"github.com/stv0g/cunicu/pkg/signaling"
 	"go.uber.org/zap"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 )
 
 func init() { //nolint:gochecknoinits
@@ -146,7 +147,7 @@ func (b *Backend) subscribeFromServer(ctx context.Context, pk *crypto.Key) error
 			if err != nil {
 				b.logger.Error("Subscription stream closed. Re-subscribing..", zap.Error(err))
 
-				if err := b.subscribeFromServer(ctx, pk); err != nil && !errors.Is(err, grpc.ErrClientConnClosing) {
+				if err := b.subscribeFromServer(ctx, pk); err != nil && status.Code(err) != codes.Canceled {
 					b.logger.Error("Failed to resubscribe", zap.Error(err))
 				}
 

test/e2e/nodes/build.go

@@ -62,7 +62,6 @@ func buildBinary(packagePath string) (string, []string, error) {
 	}
 
 	runArgs := []string{}
-	cmdArgs := []string{}
 	profileArgs := profileArgs()
 	buildArgs := []string{
 		"-buildvcs=false", // avoid build cache invalidation
@@ -94,6 +93,7 @@ func buildBinary(packagePath string) (string, []string, error) {
 
 	logger := zap.L().Named("builder")
 
+	var cmdArgs []string
 	var test bool
 
 	// Build a test binary if profiling is requested
@@ -126,7 +126,7 @@ func buildBinary(packagePath string) (string, []string, error) {
 		zap.Bool("test", test))
 
 	if output, err := exec.Command("go", cmdArgs...).CombinedOutput(); err != nil {
-		return "", nil, fmt.Errorf("Failed to build %s:\n\nError:\n%s\n\nOutput:\n%s", packagePath, path, string(output))
+		return "", nil, fmt.Errorf("ailed to build %s:\n\nError:\n%s\n\nOutput:\n%s", packagePath, path, string(output))
 	}
 
 	logger.Debug("Finished building",

test/e2e/nodes/relay.go

@@ -1,7 +1,7 @@
 package nodes
 
 import (
-	"github.com/pion/ice/v2"
+	"github.com/pion/stun"
 	g "github.com/stv0g/gont/v2/pkg"
 )
 
@@ -9,7 +9,7 @@ type RelayNode interface {
 	Node
 
 	WaitReady() error
-	URLs() []*ice.URL
+	URLs() []*stun.URI
 	Username() string
 	Password() string
 

test/e2e/nodes/relay_coturn.go

@@ -9,7 +9,6 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/pion/ice/v2"
 	"github.com/pion/stun"
 	g "github.com/stv0g/gont/v2/pkg"
 	copt "github.com/stv0g/gont/v2/pkg/options/cmd"
@@ -145,27 +144,27 @@ func (c *CoturnNode) WaitReady() error {
 	return nil
 }
 
-func (c *CoturnNode) URLs() []*ice.URL {
+func (c *CoturnNode) URLs() []*stun.URI {
 	host := c.Name()
 
-	return []*ice.URL{
+	return []*stun.URI{
 		{
-			Scheme: ice.SchemeTypeSTUN,
+			Scheme: stun.SchemeTypeSTUN,
 			Host:   host,
 			Port:   stun.DefaultPort,
-			Proto:  ice.ProtoTypeUDP,
+			Proto:  stun.ProtoTypeUDP,
 		},
 		{
-			Scheme: ice.SchemeTypeTURN,
+			Scheme: stun.SchemeTypeTURN,
 			Host:   host,
 			Port:   stun.DefaultPort,
-			Proto:  ice.ProtoTypeUDP,
+			Proto:  stun.ProtoTypeUDP,
 		},
 		{
-			Scheme: ice.SchemeTypeTURN,
+			Scheme: stun.SchemeTypeTURN,
 			Host:   host,
 			Port:   stun.DefaultPort,
-			Proto:  ice.ProtoTypeTCP,
+			Proto:  stun.ProtoTypeTCP,
 		},
 	}
 }

test/e2e/nodes/relay_list.go

@@ -9,7 +9,7 @@ import (
 
 type RelayList []RelayNode
 
-func AddRelayNodes(n *g.Network, numNodes int, opts ...g.Option) (RelayList, error) {
+func AddRelayNodes(n *g.Network, numNodes int, _ ...g.Option) (RelayList, error) {
 	ns := RelayList{}
 
 	for i := 1; i <= numNodes; i++ {

test/e2e/nodes/signaling_list.go

@@ -9,7 +9,7 @@ import (
 
 type SignalingList []SignalingNode
 
-func AddSignalingNodes(n *g.Network, numNodes int, opts ...g.Option) (SignalingList, error) {
+func AddSignalingNodes(n *g.Network, numNodes int, _ ...g.Option) (SignalingList, error) {
 	ns := SignalingList{}
 
 	for i := 1; i <= numNodes; i++ {