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container_userdata.go
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/
container_userdata.go
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// Copyright 2013, 2015 Canonical Ltd.
// Copyright 2015 Cloudbase Solutions SRL
// Licensed under the AGPLv3, see LICENCE file for details.
package containerinit
import (
"io/ioutil"
"path/filepath"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/DavinZhang/juju/cloudconfig"
"github.com/DavinZhang/juju/cloudconfig/cloudinit"
"github.com/DavinZhang/juju/cloudconfig/instancecfg"
"github.com/DavinZhang/juju/container"
corenetwork "github.com/DavinZhang/juju/core/network"
)
var (
logger = loggo.GetLogger("juju.cloudconfig.containerinit")
)
// WriteUserData generates the cloud-init user-data using the
// specified machine and network config for a container, and writes
// the serialized form out to a cloud-init file in the directory
// specified.
func WriteUserData(
instanceConfig *instancecfg.InstanceConfig,
networkConfig *container.NetworkConfig,
directory string,
) (string, error) {
userData, err := CloudInitUserData(instanceConfig, networkConfig)
if err != nil {
logger.Errorf("failed to create user data: %v", err)
return "", err
}
return WriteCloudInitFile(directory, userData)
}
// WriteCloudInitFile writes the data out to a cloud-init file in the
// directory specified, and returns the filename.
func WriteCloudInitFile(directory string, userData []byte) (string, error) {
userDataFilename := filepath.Join(directory, "cloud-init")
if err := ioutil.WriteFile(userDataFilename, userData, 0644); err != nil {
logger.Errorf("failed to write user data: %v", err)
return "", err
}
return userDataFilename, nil
}
func CloudInitUserData(
instanceConfig *instancecfg.InstanceConfig,
networkConfig *container.NetworkConfig,
) ([]byte, error) {
cloudConfig, err := cloudinit.New(instanceConfig.Series)
if err != nil {
return nil, errors.Trace(err)
}
var interfaces corenetwork.InterfaceInfos
if networkConfig != nil {
interfaces = networkConfig.Interfaces
}
err = cloudConfig.AddNetworkConfig(interfaces)
if err != nil {
return nil, errors.Trace(err)
}
udata, err := cloudconfig.NewUserdataConfig(instanceConfig, cloudConfig)
if err != nil {
return nil, errors.Trace(err)
}
if err = udata.Configure(); err != nil {
return nil, errors.Trace(err)
}
// Run ifconfig to get the addresses of the internal container at least
// logged in the host.
cloudConfig.AddRunCmd("ifconfig")
if instanceConfig.MachineContainerHostname != "" {
logger.Debugf("Cloud-init configured to set hostname")
cloudConfig.SetAttr("hostname", instanceConfig.MachineContainerHostname)
}
data, err := cloudConfig.RenderYAML()
if err != nil {
return nil, errors.Trace(err)
}
return data, nil
}