cmd,pkg: fix lint warnings

Signed-off-by: Lucas Servén Marín <lserven@gmail.com>

pkg/mesh/mesh.go

@@ -61,7 +61,6 @@ type Mesh struct {
 	ipTables            *iptables.Controller
 	kiloIface           int
 	kiloIfaceName       string
-	key                 []byte
 	local               bool
 	port                int
 	priv                wgtypes.Key
@@ -94,6 +93,9 @@ func New(backend Backend, enc encapsulation.Encapsulator, granularity Granularit
 		return nil, fmt.Errorf("failed to create directory to store configuration: %v", err)
 	}
 	privateB, err := ioutil.ReadFile(privateKeyPath)
+	if err != nil && !os.IsNotExist(err) {
+		return nil, fmt.Errorf("failed to read private key file: %v", err)
+	}
 	privateB = bytes.Trim(privateB, "\n")
 	private, err := wgtypes.ParseKey(string(privateB))
 	if err != nil {

pkg/mesh/topology_test.go

@@ -16,7 +16,6 @@ package mesh
 
 import (
 	"net"
-	"strings"
 	"testing"
 	"time"
 
@@ -27,10 +26,6 @@ import (
 	"github.com/squat/kilo/pkg/wireguard"
 )
 
-func allowedIPs(ips ...string) string {
-	return strings.Join(ips, ", ")
-}
-
 func mustParseCIDR(s string) (r net.IPNet) {
 	if _, ip, err := net.ParseCIDR(s); err != nil {
 		panic("failed to parse CIDR")