// ConfigureBasic updates the provided cloudinit.Config with
// basic configuration to initialise an OS image, such that it can
// be connected to via SSH, and log to a standard location.
//
// Any potentially failing operation should not be added to the
// configuration, but should instead be done in ConfigureJuju.
//
// Note: we don't do apt update/upgrade here so as not to have to wait on
// apt to finish when performing the second half of image initialisation.
// Doing it later brings the benefit of feedback in the face of errors,
// but adds to the running time of initialisation due to lack of activity
// between image bringup and start of agent installation.
func ConfigureBasic(cfg *MachineConfig, c *cloudinit.Config) error {
c.AddScripts(
"set -xe", // ensure we run all the scripts or abort.
)
c.AddSSHAuthorizedKeys(cfg.AuthorizedKeys)
c.SetOutput(cloudinit.OutAll, "| tee -a "+cfg.CloudInitOutputLog, "")
// Create a file in a well-defined location containing the machine's
// nonce. The presence and contents of this file will be verified
// during bootstrap.
//
// Note: this must be the last runcmd we do in ConfigureBasic, as
// the presence of the nonce file is used to gate the remainder
// of synchronous bootstrap.
noncefile := path.Join(cfg.DataDir, NonceFile)
c.AddFile(noncefile, cfg.MachineNonce, 0644)
return nil
}