// ComposeUserData fills out the provided cloudinit configuration structure
// so it is suitable for initialising a machine with the given configuration,
// and then renders it and returns it as a binary (gzipped) blob of user data.
//
// If the provided cloudcfg is nil, a new one will be created internally.
func ComposeUserData(mcfg *cloudinit.MachineConfig, cloudcfg *coreCloudinit.Config) ([]byte, error) {
if cloudcfg == nil {
cloudcfg = coreCloudinit.New()
}
if err := configureCloudinit(mcfg, cloudcfg); err != nil {
return nil, err
}
data, err := cloudcfg.Render()
logger.Tracef("Generated cloud init:\n%s", string(data))
if err != nil {
return nil, err
}
return utils.Gzip(data), nil
}