Merge pull request #124 from thaJeztah/fix_error_linting

fix error linting

Author: vvoland

nat/nat.go

@@ -192,22 +192,22 @@ func ParsePortSpec(rawPort string) ([]PortMapping, error) {
 		ip = rawIP
 	}
 	if ip != "" && net.ParseIP(ip) == nil {
-		return nil, fmt.Errorf("invalid IP address: %s", ip)
+		return nil, errors.New("invalid IP address: " + ip)
 	}
 	if containerPort == "" {
 		return nil, fmt.Errorf("no port specified: %s<empty>", rawPort)
 	}
 
 	startPort, endPort, err := ParsePortRange(containerPort)
 	if err != nil {
-		return nil, fmt.Errorf("invalid containerPort: %s", containerPort)
+		return nil, errors.New("invalid containerPort: " + containerPort)
 	}
 
 	var startHostPort, endHostPort uint64 = 0, 0
 	if len(hostPort) > 0 {
 		startHostPort, endHostPort, err = ParsePortRange(hostPort)
 		if err != nil {
-			return nil, fmt.Errorf("invalid hostPort: %s", hostPort)
+			return nil, errors.New("invalid hostPort: " + hostPort)
 		}
 	}
 

nat/parse.go

@@ -1,15 +1,15 @@
 package nat
 
 import (
-	"fmt"
+	"errors"
 	"strconv"
 	"strings"
 )
 
 // ParsePortRange parses and validates the specified string as a port-range (8000-9000)
 func ParsePortRange(ports string) (uint64, uint64, error) {
 	if ports == "" {
-		return 0, 0, fmt.Errorf("empty string specified for ports")
+		return 0, 0, errors.New("empty string specified for ports")
 	}
 	if !strings.Contains(ports, "-") {
 		start, err := strconv.ParseUint(ports, 10, 16)
@@ -27,7 +27,7 @@ func ParsePortRange(ports string) (uint64, uint64, error) {
 		return 0, 0, err
 	}
 	if end < start {
-		return 0, 0, fmt.Errorf("invalid range specified for port: %s", ports)
+		return 0, 0, errors.New("invalid range specified for port: " + ports)
 	}
 	return start, end, nil
 }