9605b5edf2
Its easier to let each datasource grab all metadata in the FetchMetadata stage than to break it into multiple stages.
111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proc_cmdline
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import (
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"errors"
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"io/ioutil"
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"log"
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"strings"
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"github.com/coreos/coreos-cloudinit/datasource"
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"github.com/coreos/coreos-cloudinit/pkg"
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)
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const (
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ProcCmdlineLocation = "/proc/cmdline"
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ProcCmdlineCloudConfigFlag = "cloud-config-url"
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)
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type procCmdline struct {
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Location string
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}
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func NewDatasource() *procCmdline {
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return &procCmdline{Location: ProcCmdlineLocation}
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}
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func (c *procCmdline) IsAvailable() bool {
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contents, err := ioutil.ReadFile(c.Location)
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if err != nil {
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return false
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}
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cmdline := strings.TrimSpace(string(contents))
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_, err = findCloudConfigURL(cmdline)
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return (err == nil)
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}
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func (c *procCmdline) AvailabilityChanges() bool {
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return false
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}
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func (c *procCmdline) ConfigRoot() string {
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return ""
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}
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func (c *procCmdline) FetchMetadata() (datasource.Metadata, error) {
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return datasource.Metadata{}, nil
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}
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func (c *procCmdline) FetchUserdata() ([]byte, error) {
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contents, err := ioutil.ReadFile(c.Location)
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if err != nil {
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return nil, err
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}
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cmdline := strings.TrimSpace(string(contents))
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url, err := findCloudConfigURL(cmdline)
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if err != nil {
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return nil, err
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}
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client := pkg.NewHttpClient()
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cfg, err := client.GetRetry(url)
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if err != nil {
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return nil, err
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}
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return cfg, nil
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}
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func (c *procCmdline) Type() string {
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return "proc-cmdline"
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}
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func findCloudConfigURL(input string) (url string, err error) {
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err = errors.New("cloud-config-url not found")
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for _, token := range strings.Split(input, " ") {
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parts := strings.SplitN(token, "=", 2)
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key := parts[0]
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key = strings.Replace(key, "_", "-", -1)
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if key != "cloud-config-url" {
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continue
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}
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if len(parts) != 2 {
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log.Printf("Found cloud-config-url in /proc/cmdline with no value, ignoring.")
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continue
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}
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url = parts[1]
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err = nil
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}
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return
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}
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