Esempio n. 1
0
// ConfigureScript generates the bash script that applies
// the specified cloud-config.
func ConfigureScript(cloudcfg *cloudinit.Config) (string, error) {
	if cloudcfg == nil {
		panic("cloudcfg is nil")
	}

	// TODO(axw): 2013-08-23 bug 1215777
	// Carry out configuration for ssh-keys-per-user,
	// machine-updates-authkeys, using cloud-init config.
	//
	// We should work with smoser to get a supported
	// command in (or next to) cloud-init for manually
	// invoking cloud-config. This would address the
	// above comment by removing the need to generate a
	// script "by hand".

	// Bootcmds must be run before anything else,
	// as they may affect package installation.
	bootcmds, err := cmdlist(cloudcfg.BootCmds())
	if err != nil {
		return "", err
	}

	// Depending on cloudcfg, potentially add package sources and packages.
	pkgcmds, err := addPackageCommands(cloudcfg)
	if err != nil {
		return "", err
	}

	// Runcmds come last.
	runcmds, err := cmdlist(cloudcfg.RunCmds())
	if err != nil {
		return "", err
	}

	// We prepend "set -xe". This is already in runcmds,
	// but added here to avoid relying on that to be
	// invariant.
	script := []string{"#!/bin/bash", "set -e"}
	// We must initialise progress reporting before entering
	// the subshell and redirecting stderr.
	script = append(script, cloudinit.InitProgressCmd())
	stdout, stderr := cloudcfg.Output(cloudinit.OutAll)
	script = append(script, "(")
	if stderr != "" {
		script = append(script, "(")
	}
	script = append(script, bootcmds...)
	script = append(script, pkgcmds...)
	script = append(script, runcmds...)
	if stderr != "" {
		script = append(script, ") "+stdout)
		script = append(script, ") "+stderr)
	} else {
		script = append(script, ") "+stdout+" 2>&1")
	}
	return strings.Join(script, "\n"), nil
}