portallocator: use const for default port-ranges, instead of init()

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

libnetwork/portallocator/portallocator.go

@@ -9,15 +9,6 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-var (
-	// defaultPortRangeStart indicates the first port in port range
-	defaultPortRangeStart = 49153
-	// defaultPortRangeEnd indicates the last port in port range
-	// consistent with default /proc/sys/net/ipv4/ip_local_port_range
-	// upper bound on linux
-	defaultPortRangeEnd = 60999
-)
-
 func sanitizePortRange(start int, end int) (newStart, newEnd int, err error) {
 	if start > defaultPortRangeEnd || end < defaultPortRangeStart || start > end {
 		return 0, 0, fmt.Errorf("Request out allowed range [%v, %v]",

libnetwork/portallocator/portallocator_unix.go

@@ -0,0 +1,12 @@
+// +build !windows
+
+package portallocator
+
+const (
+	// defaultPortRangeStart indicates the first port in port range
+	defaultPortRangeStart = 49153
+	// defaultPortRangeEnd indicates the last port in port range
+	// consistent with default /proc/sys/net/ipv4/ip_local_port_range
+	// upper bound on linux
+	defaultPortRangeEnd = 60999
+)

libnetwork/portallocator/portallocator_windows.go

@@ -1,9 +1,11 @@
 package portallocator
 
-func init() {
+const (
+	// defaultPortRangeStart indicates the first port in port range
 	defaultPortRangeStart = 60000
+	// defaultPortRangeEnd indicates the last port in port range
 	defaultPortRangeEnd = 65000
-}
+)
 
 func getDynamicPortRange() (start int, end int, err error) {
 	return defaultPortRangeStart, defaultPortRangeEnd, nil