func (s *AssignSuite) assertAssignUnitToNewMachineContainerConstraint(c *C) {
unit, err := s.wordpress.AddUnit()
c.Assert(err, IsNil)
err = unit.AssignToNewMachine()
c.Assert(err, IsNil)
machineId := s.assertAssignedUnit(c, unit)
c.Assert(state.ParentId(machineId), Not(Equals), "")
c.Assert(state.ContainerTypeFromId(machineId), Equals, instance.LXC)
}
// EnsureWeHaveLXC checks if we have lxc installed, and installs it if we
// don't. Juju 1.11 added the ability to deploy into LXC containers, and uses
// functionality from the lxc package in order to do so. Juju 1.10 did not
// install lxc, so we ensure it is installed.
// See http://bugs.launchpad.net/bug/1199913
// dataDir is the root location where data files are put. It is used to grab
// the uniter-hook-execution lock so that we don't try run to apt-get at the
// same time that a hook might want to run it.
func EnsureWeHaveLXC(dataDir, machineTag string) error {
// We need to short circuit this in two places:
// 1. if we are running a local provider, then the machines are lxc
// containers, and if we install lxc on them, it adds an lxc bridge
// network device with the same ip address as the hosts bridge. This
// screws up all the networking routes.
// 2. if the machine is an lxc container, we need to avoid installing lxc
// package for exactly the same reasons.
// Later, post-precise LTS, when we have updated lxc, we can bring this
// back in to have nested lxc, but until then, we have to avoid it.
containerType := state.ContainerTypeFromId(state.MachineIdFromTag(machineTag))
providerType := os.Getenv("JUJU_PROVIDER_TYPE")
if providerType == provider.Local || containerType == instance.LXC {
return nil
}
manager := lxc.NewContainerManager(lxc.ManagerConfig{Name: "lxc-test"})
if _, err := manager.ListContainers(); err == nil {
validationLogger.Debugf("found lxc, not installing")
// We already have it, nothing more to do
return nil
}
validationLogger.Debugf("got error looking for lxc, attempting to install")
if dataDir != "" {
lock, err := getUniterLock(dataDir, "apt-get install lxc for juju 1.11 upgrade")
if err == nil {
defer lock.Unlock()
} else {
validationLogger.Warningf("Failed to acquire lock: %v, will try to install lxc anyway", lock)
}
// If we got an error trying to acquire the lock, we try to install
// lxc anyway. Worst case the install will fail, which is where we
// are already
}
// TODO: This is not platform independent. If jujud is running on
// something other than a debian-based Linux, and we are missing
// lxc, this call will always fail. However, in juju 1.11+ we
// install lxc via cloud-init or whatever bootstrap code we use.
// So this is really only upgrade compatibility and juju 1.10
// only supports debian-based anyway
return utils.AptGetInstall("lxc")
}