func (p4 patch4T) mangle(task *state.Task) error {
snapsup, snapst, err := p4.snapSetupAndState(task)
if err != nil {
return err
}
var hadCandidate bool
if err := p4.getMaybe(task, "had-candidate", &hadCandidate); err != nil && err != state.ErrNoState {
return err
}
if hadCandidate {
change := task.Change()
if change.Kind() != "revert-snap" {
return fmt.Errorf("had-candidate true for task %s (%s) of non-revert change %s (%s)",
task.ID(), task.Kind(), change.ID(), change.Kind())
}
}
task.Clear("had-candidate")
task.Set("old-candidate-index", snapst.LastIndex(snapsup.SideInfo.Revision))
return nil
}