Fix 386 and arm cross-compile

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)

netlink/netlink_linux.go

@@ -3,7 +3,6 @@ package netlink
 import (
 	"encoding/binary"
 	"fmt"
-	"math/rand"
 	"net"
 	"sync/atomic"
 	"syscall"
@@ -949,7 +948,7 @@ func setBridgeMacAddress(s int, name string) error {
 	copy(ifr.IfrnName[:], name)
 
 	for i := 0; i < 6; i++ {
-		ifr.IfruHwaddr.Data[i] = int8(rand.Intn(255))
+		ifr.IfruHwaddr.Data[i] = randIfrDataByte()
 	}
 
 	ifr.IfruHwaddr.Data[0] &^= 0x1 // clear multicast bit

netlink/netlink_linux_arm.go

@@ -0,0 +1,9 @@
+package netlink
+
+import (
+	"math/rand"
+)
+
+func randIfrDataByte() uint8 {
+	return uint8(rand.Intn(255))
+}

netlink/netlink_linux_notarm.go

@@ -0,0 +1,11 @@
+// +build !arm
+
+package netlink
+
+import (
+	"math/rand"
+)
+
+func randIfrDataByte() int8 {
+	return int8(rand.Intn(255))
+}

system/sysconfig.go

@@ -4,10 +4,9 @@ package system
 
 /*
 #include <unistd.h>
-int get_hz(void) { return sysconf(_SC_CLK_TCK); }
 */
 import "C"
 
 func GetClockTicks() int {
-	return int(C.get_hz())
+	return int(C.sysconf(C._SC_CLK_TCK))
 }

system/sysconfig_notcgo.go

@@ -0,0 +1,8 @@
+// +build linux,!cgo
+
+package system
+
+func GetClockTicks() int {
+	// TODO figure out a better alternative for platforms where we're missing cgo
+	return 100
+}