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cloud_init_target.go
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cloud_init_target.go
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package cloudinit
import (
"encoding/base64"
"fmt"
"github.com/golang/glog"
"io"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/utils"
"os"
"path"
)
type CloudInitTarget struct {
Config *CloudConfig
out io.Writer
Tags map[string]struct{}
}
type AddBehaviour int
const (
Always AddBehaviour = iota
Once
)
func NewCloudInitTarget(out io.Writer, tags map[string]struct{}) *CloudInitTarget {
t := &CloudInitTarget{
Config: &CloudConfig{},
out: out,
Tags: tags,
}
return t
}
var _ fi.Target = &CloudInitTarget{}
type CloudConfig struct {
PackageUpdate bool `json:"package_update"`
Packages []string `json:"packages,omitempty"`
RunCommmands [][]string `json:"runcmd,omitempty"`
WriteFiles []*CloudConfigFile `json:"write_files,omitempty"`
}
type CloudConfigFile struct {
Encoding string `json:"encoding,omitempty"`
Owner string `json:"owner,omitempty"`
Path string `json:"path,omitempty"`
Permissions string `json:"permissions,omitempty"`
Content string `json:"content,omitempty"`
}
func (t *CloudInitTarget) HasTag(tag string) bool {
_, found := t.Tags[tag]
return found
}
func (t *CloudInitTarget) AddMkdirpCommand(p string, dirMode os.FileMode) {
t.AddCommand(Once, "mkdir", "-p", "-m", fi.FileModeToString(dirMode), p)
}
func (t *CloudInitTarget) AddDownloadCommand(addBehaviour AddBehaviour, url string, dest string) {
// TODO: Create helper to download reliably and validate hash?
// ... but then why not just use cloudup :-)
t.AddCommand(addBehaviour, "curl", "-f", "--ipv4", "-Lo", dest, "--connect-timeout", "20", "--retry", "6", "--retry-delay", "10", url)
}
func (t *CloudInitTarget) fetch(p *fi.Source, destPath string) {
// We could probably move this to fi.Source - it is likely to be the same for every provider
if p.URL != "" {
if p.Parent != nil {
glog.Fatalf("unexpected parent with SourceURL in FetchInstructions: %v", p)
}
t.AddDownloadCommand(Once, p.URL, destPath)
} else if p.ExtractFromArchive != "" {
if p.Parent == nil {
glog.Fatalf("unexpected ExtractFromArchive without parent in FetchInstructions: %v", p)
}
// TODO: Remove duplicate commands?
archivePath := "/tmp/" + utils.SanitizeString(p.Parent.Key())
t.fetch(p.Parent, archivePath)
extractDir := "/tmp/extracted_" + utils.SanitizeString(p.Parent.Key())
t.AddMkdirpCommand(extractDir, 0755)
t.AddCommand(Once, "tar", "zxf", archivePath, "-C", extractDir)
// Always because this shouldn't happen and we want an indication that it happened
t.AddCommand(Always, "cp", path.Join(extractDir, p.ExtractFromArchive), destPath)
} else {
glog.Fatalf("unknown FetchInstructions: %v", p)
}
}
func (t *CloudInitTarget) WriteFile(destPath string, contents fi.Resource, fileMode os.FileMode, dirMode os.FileMode) error {
var p *fi.Source
if hs, ok := contents.(fi.HasSource); ok {
p = hs.GetSource()
}
if p != nil {
t.AddMkdirpCommand(path.Dir(destPath), dirMode)
t.fetch(p, destPath)
} else {
// TODO: No way to specify parent dir permissions?
f := &CloudConfigFile{
Encoding: "b64",
Owner: "root:root",
Permissions: fi.FileModeToString(fileMode),
Path: destPath,
}
d, err := fi.ResourceAsBytes(contents)
if err != nil {
return err
}
// Not a strict limit, just a sanity check
if len(d) > 256*1024 {
return fmt.Errorf("resource is very large (failed sanity-check): %v", contents)
}
f.Content = base64.StdEncoding.EncodeToString(d)
t.Config.WriteFiles = append(t.Config.WriteFiles, f)
}
return nil
}
func (t *CloudInitTarget) Chown(path string, user, group string) {
t.AddCommand(Always, "chown", user+":"+group, path)
}
func (t *CloudInitTarget) AddCommand(addBehaviour AddBehaviour, args ...string) {
switch addBehaviour {
case Always:
break
case Once:
for _, c := range t.Config.RunCommmands {
if utils.StringSlicesEqual(args, c) {
glog.V(2).Infof("skipping pre-existing command because AddBehaviour=Once: %q", args)
return
}
}
break
default:
glog.Fatalf("unknown AddBehaviour: %v", addBehaviour)
}
t.Config.RunCommmands = append(t.Config.RunCommmands, args)
}
func (t *CloudInitTarget) Finish(taskMap map[string]fi.Task) error {
d, err := utils.YamlMarshal(t.Config)
if err != nil {
return fmt.Errorf("error serializing config to yaml: %v", err)
}
conf := "#cloud-config\n" + string(d)
_, err = t.out.Write([]byte(conf))
if err != nil {
return fmt.Errorf("error writing cloud-init data to output: %v", err)
}
return nil
}