func (v vmware) FetchUserdata() ([]byte, error) {
encoding, err := v.readConfig("coreos.config.data.encoding")
if err != nil {
return nil, err
}
data, err := v.readConfig("coreos.config.data")
if err != nil {
return nil, err
}
// Try to fallback to url if no explicit data
if data == "" {
url, err := v.readConfig("coreos.config.url")
if err != nil {
return nil, err
}
if url != "" {
rawData, err := v.urlDownload(url)
if err != nil {
return nil, err
}
data = string(rawData)
}
}
if encoding != "" {
return config.DecodeContent(data, encoding)
}
return []byte(data), nil
}
func WriteFile(f *File, root string) (string, error) {
fullpath := path.Join(root, f.Path)
dir := path.Dir(fullpath)
log.Printf("Writing file to %q", fullpath)
content, err := config.DecodeContent(f.Content, f.Encoding)
if err != nil {
return "", fmt.Errorf("Unable to decode %s (%v)", f.Path, err)
}
if err := EnsureDirectoryExists(dir); err != nil {
return "", err
}
perm, err := f.Permissions()
if err != nil {
return "", err
}
var tmp *os.File
// Create a temporary file in the same directory to ensure it's on the same filesystem
if tmp, err = ioutil.TempFile(dir, "cloudinit-temp"); err != nil {
return "", err
}
if err := ioutil.WriteFile(tmp.Name(), content, perm); err != nil {
return "", err
}
if err := tmp.Close(); err != nil {
return "", err
}
// Ensure the permissions are as requested (since WriteFile can be affected by sticky bit)
if err := os.Chmod(tmp.Name(), perm); err != nil {
return "", err
}
if f.Owner != "" {
// We shell out since we don't have a way to look up unix groups natively
cmd := exec.Command("chown", f.Owner, tmp.Name())
if err := cmd.Run(); err != nil {
return "", err
}
}
if err := os.Rename(tmp.Name(), fullpath); err != nil {
return "", err
}
log.Printf("Wrote file to %q", fullpath)
return fullpath, nil
}
// checkEncoding validates that, for each file under 'write_files', the
// content can be decoded given the specified encoding.
func checkEncoding(cfg node, report *Report) {
for _, f := range cfg.Child("write_files").children {
e := f.Child("encoding")
if !e.IsValid() {
continue
}
c := f.Child("content")
if _, err := config.DecodeContent(c.String(), e.String()); err != nil {
report.Error(c.line, fmt.Sprintf("content cannot be decoded as %q", e.String()))
}
}
}