func (s *BlockDevicesSuite) TestWatchBlockDevices(c *gc.C) {
sda := state.BlockDeviceInfo{DeviceName: "sda"}
sdb := state.BlockDeviceInfo{DeviceName: "sdb"}
sdc := state.BlockDeviceInfo{DeviceName: "sdc"}
err := s.machine.SetMachineBlockDevices(sda, sdb, sdc)
c.Assert(err, jc.ErrorIsNil)
// Start block device watcher.
w := s.State.WatchBlockDevices(s.machine.MachineTag())
defer testing.AssertStop(c, w)
wc := testing.NewNotifyWatcherC(c, s.State, w)
wc.AssertOneChange()
// Setting the same should not trigger the watcher.
err = s.machine.SetMachineBlockDevices(sdc, sdb, sda)
c.Assert(err, jc.ErrorIsNil)
wc.AssertNoChange()
// change sdb's label.
sdb.Label = "fatty"
err = s.machine.SetMachineBlockDevices(sda, sdb, sdc)
c.Assert(err, jc.ErrorIsNil)
wc.AssertOneChange()
// change sda's label and sdb's UUID at once.
sda.Label = "giggly"
sdb.UUID = "4c062658-6225-4f4b-96f3-debf00b964b4"
err = s.machine.SetMachineBlockDevices(sda, sdb, sdc)
c.Assert(err, jc.ErrorIsNil)
wc.AssertOneChange()
// drop sdc.
err = s.machine.SetMachineBlockDevices(sda, sdb)
c.Assert(err, jc.ErrorIsNil)
wc.AssertOneChange()
// add sdc again: should get a new name.
err = s.machine.SetMachineBlockDevices(sda, sdb, sdc)
c.Assert(err, jc.ErrorIsNil)
wc.AssertOneChange()
}
func (s *BlockDevicesSuite) TestSetMachineBlockDevicesUpdates(c *gc.C) {
sda := state.BlockDeviceInfo{DeviceName: "sda"}
sdb := state.BlockDeviceInfo{DeviceName: "sdb"}
err := s.machine.SetMachineBlockDevices(sda, sdb)
c.Assert(err, jc.ErrorIsNil)
s.assertBlockDevices(c, s.machine.MachineTag(), []state.BlockDeviceInfo{sda, sdb})
sdb.Label = "root"
err = s.machine.SetMachineBlockDevices(sdb)
c.Assert(err, jc.ErrorIsNil)
s.assertBlockDevices(c, s.machine.MachineTag(), []state.BlockDeviceInfo{sdb})
// If a device is attached, unattached, then attached again,
// then it gets a new name.
sdb.Label = "" // Label should be reset.
sdb.FilesystemType = "ext4"
err = s.machine.SetMachineBlockDevices(sda, sdb)
c.Assert(err, jc.ErrorIsNil)
s.assertBlockDevices(c, s.machine.MachineTag(), []state.BlockDeviceInfo{
sda,
sdb,
})
}