// Init initializes the command for running.
func (a *UnitAgent) Init(args []string) error {
if a.UnitName == "" {
return cmdutil.RequiredError("unit-name")
}
if !names.IsValidUnit(a.UnitName) {
return fmt.Errorf(`--unit-name option expects "<service>/<n>" argument`)
}
if err := a.AgentConf.CheckArgs(args); err != nil {
return err
}
a.runner = worker.NewRunner(cmdutil.IsFatal, cmdutil.MoreImportant, worker.RestartDelay)
if !a.logToStdErr {
if err := a.ReadConfig(a.Tag().String()); err != nil {
return err
}
agentConfig := a.CurrentConfig()
// the writer in ctx.stderr gets set as the loggo writer in github.com/juju/cmd/logging.go
a.ctx.Stderr = &lumberjack.Logger{
Filename: agent.LogFilename(agentConfig),
MaxSize: 300, // megabytes
MaxBackups: 2,
}
}
return nil
}
// Init is called by the cmd system to initialize the structure for
// running.
func (a *machineAgentCmd) Init(args []string) error {
if !names.IsValidMachine(a.machineId) {
return fmt.Errorf("--machine-id option must be set, and expects a non-negative integer")
}
if err := a.agentInitializer.CheckArgs(args); err != nil {
return err
}
// Due to changes in the logging, and needing to care about old
// models that have been upgraded, we need to explicitly remove the
// file writer if one has been added, otherwise we will get duplicate
// lines of all logging in the log file.
loggo.RemoveWriter("logfile")
if a.logToStdErr {
return nil
}
err := a.currentConfig.ReadConfig(names.NewMachineTag(a.machineId).String())
if err != nil {
return errors.Annotate(err, "cannot read agent configuration")
}
// the context's stderr is set as the loggo writer in github.com/juju/cmd/logging.go
a.ctx.Stderr = &lumberjack.Logger{
Filename: agent.LogFilename(a.currentConfig.CurrentConfig()),
MaxSize: 300, // megabytes
MaxBackups: 2,
}
return nil
}