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configdrive.go
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configdrive.go
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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package configdrive
import (
"encoding/json"
"io/ioutil"
"log"
"os"
"path"
"github.com/coreos/coreos-cloudinit/datasource"
)
const (
openstackApiVersion = "latest"
)
type configDrive struct {
root string
readFile func(filename string) ([]byte, error)
}
func NewDatasource(root string) *configDrive {
return &configDrive{root, ioutil.ReadFile}
}
func (cd *configDrive) IsAvailable() bool {
_, err := os.Stat(cd.root)
return !os.IsNotExist(err)
}
func (cd *configDrive) AvailabilityChanges() bool {
return true
}
func (cd *configDrive) ConfigRoot() string {
return cd.openstackRoot()
}
func (cd *configDrive) FetchMetadata() (metadata datasource.Metadata, err error) {
var data []byte
var m struct {
SSHAuthorizedKeyMap map[string]string `json:"public_keys"`
Hostname string `json:"hostname"`
NetworkConfig struct {
ContentPath string `json:"content_path"`
} `json:"network_config"`
}
if data, err = cd.tryReadFile(path.Join(cd.openstackVersionRoot(), "meta_data.json")); err != nil || len(data) == 0 {
return
}
if err = json.Unmarshal([]byte(data), &m); err != nil {
return
}
metadata.SSHPublicKeys = m.SSHAuthorizedKeyMap
metadata.Hostname = m.Hostname
if m.NetworkConfig.ContentPath != "" {
metadata.NetworkConfig, err = cd.tryReadFile(path.Join(cd.openstackRoot(), m.NetworkConfig.ContentPath))
}
return
}
func (cd *configDrive) FetchUserdata() ([]byte, error) {
return cd.tryReadFile(path.Join(cd.openstackVersionRoot(), "user_data"))
}
func (cd *configDrive) Type() string {
return "cloud-drive"
}
func (cd *configDrive) openstackRoot() string {
return path.Join(cd.root, "openstack")
}
func (cd *configDrive) openstackVersionRoot() string {
return path.Join(cd.openstackRoot(), openstackApiVersion)
}
func (cd *configDrive) tryReadFile(filename string) ([]byte, error) {
log.Printf("Attempting to read from %q\n", filename)
data, err := cd.readFile(filename)
if os.IsNotExist(err) {
err = nil
}
return data, err
}