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// Copyright 2012, 2013 Canonical Ltd.
// Licensed under the LGPLv3, see COPYING and COPYING.LESSER file for details.
package golxc
import (
"fmt"
"strings"
)
const (
defaultAddr = "10.0.3.1"
defaultBridge = "lxcbr0"
)
// StartNetwork starts the lxc network subsystem.
func StartNetwork() error {
goal, _, err := networkStatus()
if err != nil {
return err
}
if goal != "start" {
_, err := run("start", "lxc-net")
if err != nil {
return err
}
}
return nil
}
// StopNetwork stops the lxc network subsystem.
func StopNetwork() error {
goal, _, err := networkStatus()
if err != nil {
return err
}
if goal != "stop" {
_, err := run("stop", "lxc-net")
if err != nil {
return err
}
}
return nil
}
// IsNotworkRunning checks if the lxc network subsystem
// is running.
func IsNetworkRunning() (bool, error) {
_, status, err := networkStatus()
if err != nil {
return false, err
}
return status == "running", nil
}
// NetworkAttributes returns the lxc network attributes:
// starting IP address and bridge name.
func NetworkAttributes() (addr, bridge string, err error) {
config, err := ReadConf()
if err != nil {
return "", "", err
}
addr = config["address"]
if addr == "" {
addr = defaultAddr
}
bridge = config["bridge"]
if bridge == "" {
bridge = defaultBridge
}
return addr, bridge, nil
}
// networkStatus returns the status of the lxc network subsystem.
func networkStatus() (goal, status string, err error) {
output, err := run("status", "lxc-net")
if err != nil {
return "", "", err
}
fields := strings.Fields(output)
if len(fields) != 2 {
return "", "", fmt.Errorf("unexpected status output: %q", output)
}
fields = strings.Split(fields[1], "/")
if len(fields) != 2 {
return "", "", fmt.Errorf("unexpected status output: %q", output)
}
return fields[0], fields[1], nil
}
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