90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
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package system
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import (
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"fmt"
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"io/ioutil"
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"net"
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"os/exec"
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"path"
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"github.com/coreos/coreos-cloudinit/network"
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"github.com/coreos/coreos-cloudinit/third_party/github.com/dotcloud/docker/pkg/netlink"
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)
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const (
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runtimeNetworkPath = "/run/systemd/network"
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)
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func RestartNetwork(interfaces []network.InterfaceGenerator) (err error) {
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defer func() {
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if e := restartNetworkd(); e != nil {
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err = e
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}
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}()
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if err = downNetworkInterfaces(interfaces); err != nil {
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return
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}
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if err = probe8012q(); err != nil {
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return
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}
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return
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}
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func downNetworkInterfaces(interfaces []network.InterfaceGenerator) error {
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sysInterfaceMap := make(map[string]*net.Interface)
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if systemInterfaces, err := net.Interfaces(); err == nil {
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for _, iface := range systemInterfaces {
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sysInterfaceMap[iface.Name] = &iface
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}
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} else {
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return err
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}
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for _, iface := range interfaces {
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if systemInterface, ok := sysInterfaceMap[iface.Name()]; ok {
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if err := netlink.NetworkLinkDown(systemInterface); err != nil {
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fmt.Printf("Error while downing interface %q (%s). Continuing...\n", systemInterface.Name, err)
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}
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}
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}
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return nil
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}
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func probe8012q() error {
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return exec.Command("modprobe", "8021q").Run()
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}
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func restartNetworkd() error {
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_, err := RunUnitCommand("restart", "systemd-networkd.service")
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return err
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}
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func WriteNetworkdConfigs(interfaces []network.InterfaceGenerator) error {
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for _, iface := range interfaces {
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filename := path.Join(runtimeNetworkPath, fmt.Sprintf("%s.netdev", iface.Name()))
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if err := writeConfig(filename, iface.Netdev()); err != nil {
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return err
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}
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filename = path.Join(runtimeNetworkPath, fmt.Sprintf("%s.link", iface.Name()))
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if err := writeConfig(filename, iface.Link()); err != nil {
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return err
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}
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filename = path.Join(runtimeNetworkPath, fmt.Sprintf("%s.network", iface.Name()))
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if err := writeConfig(filename, iface.Network()); err != nil {
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return err
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}
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}
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return nil
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}
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func writeConfig(filename string, config string) error {
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if config == "" {
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return nil
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}
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return ioutil.WriteFile(filename, []byte(config), 0444)
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}
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