github.com/makyo/juju@v0.0.0-20160425123129-2608902037e9/agent/identity.go (about)

     1  // Copyright 2013 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package agent
     5  
     6  import (
     7  	"os"
     8  
     9  	"github.com/juju/errors"
    10  	"github.com/juju/utils"
    11  )
    12  
    13  var ErrNoStateServingInfo = errors.New("StateServingInfo missing")
    14  
    15  func WriteSystemIdentityFile(c Config) error {
    16  	info, ok := c.StateServingInfo()
    17  	if !ok {
    18  		return errors.Trace(ErrNoStateServingInfo)
    19  	}
    20  	// Write non-empty contents to the file, otherwise delete it
    21  	if info.SystemIdentity != "" {
    22  		logger.Infof("writing system identity file")
    23  		err := utils.AtomicWriteFile(c.SystemIdentityPath(), []byte(info.SystemIdentity), 0600)
    24  		if err != nil {
    25  			return errors.Annotate(err, "cannot write system identity")
    26  		}
    27  	} else {
    28  		logger.Infof("removing system identity file")
    29  		os.Remove(c.SystemIdentityPath())
    30  	}
    31  	return nil
    32  }