示例#1
0
// Prepare implements environs.EnvironProvider.Prepare.
func (p environProvider) Prepare(ctx environs.BootstrapContext, cfg *config.Config) (environs.Environ, error) {
	// The user must not set bootstrap-ip; this is determined by the provider,
	// and its presence used to determine whether the environment has yet been
	// bootstrapped.
	if _, ok := cfg.UnknownAttrs()["bootstrap-ip"]; ok {
		return nil, fmt.Errorf("bootstrap-ip must not be specified")
	}
	err := checkLocalPort(cfg.StatePort(), "state port")
	if err != nil {
		return nil, err
	}
	err = checkLocalPort(cfg.APIPort(), "API port")
	if err != nil {
		return nil, err
	}
	// If the user has specified no values for any of the three normal
	// proxies, then look in the environment and set them.
	attrs := map[string]interface{}{
		// We must not proxy SSH through the API server in a
		// local provider environment. Besides not being useful,
		// it may not work; there is no requirement for sshd to
		// be available on machine-0.
		"proxy-ssh": false,
	}
	setIfNotBlank := func(key, value string) {
		if value != "" {
			attrs[key] = value
		}
	}
	logger.Tracef("Look for proxies?")
	if cfg.HttpProxy() == "" &&
		cfg.HttpsProxy() == "" &&
		cfg.FtpProxy() == "" &&
		cfg.NoProxy() == "" {
		proxy := osenv.DetectProxies()
		logger.Tracef("Proxies detected %#v", proxy)
		setIfNotBlank("http-proxy", proxy.Http)
		setIfNotBlank("https-proxy", proxy.Https)
		setIfNotBlank("ftp-proxy", proxy.Ftp)
		setIfNotBlank("no-proxy", proxy.NoProxy)
	}
	if cfg.AptHttpProxy() == "" &&
		cfg.AptHttpsProxy() == "" &&
		cfg.AptFtpProxy() == "" {
		proxy, err := detectAptProxies()
		if err != nil {
			return nil, err
		}
		setIfNotBlank("apt-http-proxy", proxy.Http)
		setIfNotBlank("apt-https-proxy", proxy.Https)
		setIfNotBlank("apt-ftp-proxy", proxy.Ftp)
	}
	if len(attrs) > 0 {
		cfg, err = cfg.Apply(attrs)
		if err != nil {
			return nil, err
		}
	}

	return p.Open(cfg)
}