Commits on Jul 23, 2023

1. Merge snapcore/snapd/state changes as of ffa162ef6b …

   State:
   - Add WaitStatus support that allows a task to wait until further action
     to continue its execution. The WaitStatus is treated mostly as
     DoneStatus, except it is not a ready status.
   - Add CopyState function.
   - Add Change.AbortUnreadyLanes.
   - Add Change.CheckTaskDependencies to check if tasks have circular
     dependencies.
   - Add task and change callbacks invoked on a status change.
   - Implement timings.GetSaver interface in state.State. Note, however,
     the snapcore/snapd/timings package that provides the interface is not
     included in this PR. pebble has a similar "timing" package. It might
     be reasonable to introduce "timings" separately to replace the
     "timing" package to keep concerns (state and timings) separated.
   
   State engine:
   - Add StateStarterUp interface to perform possible expensive
     initialisation in a separate StartUp method.
   
   Overlord:
   - Implement the StateStarterUp interface
   
   Daemon:
   - Call Overlord StartUp during the start process to complete its
     initialisation. Note, that there is no obvious requirement to
     introduce this separation for pebble. It can still initialise Overlord
     in New(). The separation was mimicked to maintain better compatibility
     with possible future mergers of the snapcore/snapd/overlord/* changes.
   
   Misc:
   - Add jsonutil package required by the new state's CopyState function.
   - Rename osutil.CanStat to osutil.FileExist.
   - Rename task.FakeTime to task.MockTime.
   - Add testutil.ErrorIs and testutil.DeepUnsortedMatches checkers.

   

   dmitry-lyfar committed Jul 23, 2023
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