func (u *UniterAPI) checkRemoteUnit(relUnit *state.RelationUnit, remoteUnitTag string) (string, error) {
// Make sure the unit is indeed remote.
if remoteUnitTag == u.auth.GetAuthTag() {
return "", common.ErrPerm
}
// Check remoteUnit is indeed related. Note that we don't want to actually get
// the *Unit, because it might have been removed; but its relation settings will
// persist until the relation itself has been removed (and must remain accessible
// because the local unit's view of reality may be time-shifted).
_, remoteUnitName, err := names.ParseTag(remoteUnitTag, names.UnitTagKind)
if err != nil {
return "", err
}
remoteServiceName := names.UnitService(remoteUnitName)
rel := relUnit.Relation()
_, err = rel.RelatedEndpoints(remoteServiceName)
if err != nil {
return "", common.ErrPerm
}
return remoteUnitName, nil
}
