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This allows to find all containers inside a sandbox more efficiently.
This operation is required every time a container starts and stops,
and previously required loading *all* container state files to check
whether the container belonged to the sandbox.
Apert from being inneficient, it has caused problems when state files
are stale or corrupt, causing inavalability to create any container.
Also adjust commands `list` and `debug` to skip over files that fail
to load.
Resolves #5052
PiperOrigin-RevId: 348050637
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* Rename syncutil to sync.
* Add aliases to sync types.
* Replace existing usage of standard library sync package.
This will make it easier to swap out synchronization primitives. For example,
this will allow us to use primitives from github.com/sasha-s/go-deadlock to
check for lock ordering violations.
Updates #1472
PiperOrigin-RevId: 289033387
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Sandbox root dir was not being saved with the Container state,
so it would point to the wrong directory location when attempting
to lock the sandbox. This led to race conditions saving and
loading container state. Fixing it, led to multiple deadlocks.
I've moved the saving and locking logic to a separate struct and
moved the lock file inside the RootDir (instead of container
root dir), which allows the lock to be taken inside Destroy,
and removes the need to lock the sandbox.
PiperOrigin-RevId: 277599612
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