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766e1d95d3
This package handles meta and user data for different cloud and other platforms. It should be easy to extend to new platforms. Currently, it handles GCP metadata and a simple CDROM userdata provider. Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
106 lines
2.8 KiB
Go
106 lines
2.8 KiB
Go
package main
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import (
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"path"
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"strings"
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"time"
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)
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const (
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project = "http://metadata.google.internal/computeMetadata/v1/project/"
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instance = "http://metadata.google.internal/computeMetadata/v1/instance/"
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)
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// ProviderGCP is the type implementing the Provider interface for GCP
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type ProviderGCP struct {
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}
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// NewGCP returns a new ProviderGCP
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func NewGCP() *ProviderGCP {
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return &ProviderGCP{}
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}
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// Probe checks if we are running on GCP
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func (p *ProviderGCP) Probe() bool {
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// Getting the hostname should always work...
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_, err := gcpGet(instance + "hostname")
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log.Printf("GCP: Probe -> %s", err)
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return (err == nil)
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}
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// Extract gets both the GCP specific and generic userdata
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func (p *ProviderGCP) Extract() ([]byte, error) {
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// Get host name. This must not fail
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hostname, err := gcpGet(instance + "hostname")
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if err != nil {
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return nil, err
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}
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err = ioutil.WriteFile(path.Join(ConfigPath, Hostname), hostname, 0644)
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if err != nil {
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return nil, fmt.Errorf("GCP: Failed to write hostname: %s", err)
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}
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// SSH keys:
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// TODO also retrieve the instance keys and respect block
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// project keys see:
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// https://cloud.google.com/compute/docs/instances/ssh-keys
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// The keys have usernames attached, but as a simplification
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// we are going to add them all to one root file
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// TODO split them into individual user files and make the ssh
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// container construct those users
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sshKeys, err := gcpGet(project + "attributes/sshKeys")
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if err == nil {
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rootKeys := ""
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for _, line := range strings.Split(string(sshKeys), "\n") {
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parts := strings.SplitN(line, ":", 2)
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// ignoring username for now
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if len(parts) == 2 {
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rootKeys = rootKeys + parts[1] + "\n"
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}
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}
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err = ioutil.WriteFile(path.Join(ConfigPath, SSH, "authorized_keys"), []byte(rootKeys), 0600)
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if err != nil {
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log.Printf("GCP: Failed to write ssh keys: %s", err)
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}
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}
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// Generic userdata
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userData, err := gcpGet(instance + "attributes/userdata")
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if err != nil {
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log.Printf("GCP: Failed to get user-data: %s", err)
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// This is not an error
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return nil, nil
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}
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return userData, nil
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}
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// gcpGet requests and extracts the requested URL
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func gcpGet(url string) ([]byte, error) {
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var client = &http.Client{
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Timeout: time.Second * 2,
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}
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req, err := http.NewRequest("", url, nil)
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if err != nil {
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return nil, fmt.Errorf("GCP: http.NewRequest failed: %s", err)
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}
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req.Header.Set("Metadata-Flavor", "Google")
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resp, err := client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("GCP: Could not contact metadata service: %s", err)
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}
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if resp.StatusCode != 200 {
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return nil, fmt.Errorf("GCP: Status not ok: %d", resp.StatusCode)
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}
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("GCP: Failed to read http response: %s", err)
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}
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return body, nil
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}
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