func (d *Deployer) loop(w *state.UnitsWatcher) error {
deployed, err := d.mgr.DeployedUnits()
if err != nil {
return err
}
for _, unitName := range deployed {
d.deployed[unitName] = true
if err := d.changed(unitName); err != nil {
return err
}
}
for {
select {
case <-d.tomb.Dying():
return tomb.ErrDying
case changes, ok := <-w.Changes():
if !ok {
return watcher.MustErr(w)
}
for _, unitName := range changes {
if err := d.changed(unitName); err != nil {
return err
}
}
}
}
panic("unreachable")
}
