forked from lyft/cni-ipvlan-vpc-k8s
/
up.go
36 lines (31 loc) · 887 Bytes
/
up.go
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package nl
import (
"fmt"
"os"
"time"
"github.com/vishvananda/netlink"
)
const interfaceSettleWaitTime = 100 * time.Millisecond
const interfaceSettleDeadline = 20 * time.Second
// UpInterface brings up an interface by name
func UpInterface(name string) error {
link, err := netlink.LinkByName(name)
if err != nil {
return err
}
return netlink.LinkSetUp(link)
}
// UpInterfacePoll waits until an interface can be resolved by netlink and then call up on the interface.
func UpInterfacePoll(name string) error {
for start := time.Now(); time.Since(start) <= interfaceSettleDeadline; time.Sleep(interfaceSettleWaitTime) {
err := UpInterface(name)
if err == nil {
return nil
}
_, err = fmt.Fprintf(os.Stderr, "Failing to enumerate %v due to %v\n", name, err)
if err != nil {
panic(err)
}
}
return fmt.Errorf("Interface was not found after setting time")
}