96 lines
1.7 KiB
Go
96 lines
1.7 KiB
Go
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/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() ([]byte, error) {
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return []byte{}, 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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