Change the way aliases to subcommands are handled.

worker/uniter/jujuc/juju-log.go

 package jujuc
 
 import (
         "errors"
         "launchpad.net/gnuflag"
         "launchpad.net/juju-core/cmd"
         "launchpad.net/juju-core/log"
         "strings"
 )
 
 // JujuLogCommand implements the juju-log command.
 type JujuLogCommand struct {
         ctx     Context
         Message string
         Debug   bool
         Level   string // unused
 }
 
 func NewJujuLogCommand(ctx Context) cmd.Command {
         return &JujuLogCommand{ctx: ctx}
 }
 
 func (c *JujuLogCommand) Info() *cmd.Info {
-        return cmd.NewInfo("juju-log", "<message>", "write a message to the juju log", "")
+        return &cmd.Info{
+                Name:    "juju-log",
+                Args:    "<message>",
+                Purpose: "write a message to the juju log",
+        }
 }
 
 func (c *JujuLogCommand) SetFlags(f *gnuflag.FlagSet) {
         f.BoolVar(&c.Debug, "debug", false, "log at debug level")
         f.StringVar(&c.Level, "l", "INFO", "Send log message at the given level")
 }
 
 func (c *JujuLogCommand) Init(args []string) error {
         if args == nil {
                 return errors.New("no message specified")
         }
         c.Message = strings.Join(args, " ")
         return nil
 }
 
 func (c *JujuLogCommand) Run(_ *cmd.Context) error {
         badge := c.ctx.UnitName()
         if r, found := c.ctx.HookRelation(); found {
                 badge = badge + " " + r.FakeId()
         }
         msg := badge + ": " + c.Message
         if c.Debug {
                 log.Debugf("%s", msg)
         } else {
                 log.Printf("%s", msg)
         }
         return nil
 }