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package network
import (
"fmt"
"os/exec"
"github.com/containers/common/pkg/config"
"github.com/containers/podman/v2/pkg/util"
"github.com/containers/podman/v2/utils"
"github.com/sirupsen/logrus"
)
// GetFreeDeviceName returns a device name that is unused; used when no network
// name is provided by user
func GetFreeDeviceName(config *config.Config) (string, error) {
var (
deviceNum uint
deviceName string
)
networkNames, err := GetNetworkNamesFromFileSystem(config)
if err != nil {
return "", err
}
liveNetworksNames, err := GetLiveNetworkNames()
if err != nil {
return "", err
}
bridgeNames, err := GetBridgeNamesFromFileSystem(config)
if err != nil {
return "", err
}
for {
deviceName = fmt.Sprintf("%s%d", CNIDeviceName, deviceNum)
logrus.Debugf("checking if device name %q exists in other cni networks", deviceName)
if util.StringInSlice(deviceName, networkNames) {
deviceNum++
continue
}
logrus.Debugf("checking if device name %q exists in live networks", deviceName)
if util.StringInSlice(deviceName, liveNetworksNames) {
deviceNum++
continue
}
logrus.Debugf("checking if device name %q already exists as a bridge name ", deviceName)
if !util.StringInSlice(deviceName, bridgeNames) {
break
}
deviceNum++
}
return deviceName, nil
}
// RemoveInterface removes an interface by the given name
func RemoveInterface(interfaceName string) error {
// Make sure we have the ip command on the system
ipPath, err := exec.LookPath("ip")
if err != nil {
return err
}
// Delete the network interface
_, err = utils.ExecCmd(ipPath, []string{"link", "del", interfaceName}...)
return err
}
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