cmd/juju: warn about existing jenv file

cmd/juju/bootstrap.go

 // Copyright 2012, 2013 Canonical Ltd.
 // Licensed under the AGPLv3, see LICENCE file for details.
 
 package main
 
 import (
         "fmt"
         "os"
         "strings"
 
@@ skipping 95 matching lines @@
 
 // Run connects to the environment specified on the command line and bootstraps
 // a juju in that environment if none already exists. If there is as yet no environments.yaml file,
 // the user is informed how to create one.
 func (c *BootstrapCommand) Run(ctx *cmd.Context) (resultErr error) {
         store, err := configstore.Default()
         if err != nil {
                 return err
         }
         var existing bool
-        if _, err := store.ReadInfo(c.EnvName); !errors.IsNotFoundError(err) {
+        if environInfo, err := store.ReadInfo(c.EnvName); !errors.IsNotFoundError(err) {
                 existing = true
+                logger.Warningf("ignoring environments.yaml: using bootstrap config in %s", environInfo.Location())
         }
         environ, err := environs.PrepareFromName(c.EnvName, ctx, store)
         if err != nil {
                 return err
         }
         if !existing {
                 defer destroyPreparedEnviron(environ, store, &resultErr, "Bootstrap")
         }
         if err := bootstrap.EnsureNotBootstrapped(environ); err != nil {
                 return err
@@ skipping 74 matching lines @@
 // probably upload, based on cfg.
 func getUploadSeries(cfg *config.Config, series []string) []string {
         unique := set.NewStrings(series...)
         if unique.IsEmpty() {
                 unique.Add(version.Current.Series)
                 unique.Add(config.DefaultSeries)
                 unique.Add(cfg.DefaultSeries())
         }
         return unique.Values()
 }