Commits on Jul 30, 2024

1. Improve locking UX …

   My experience recently playing around with our locking behaviour is
   that, while mostly seamless and not seen by users, it's leaks
   implementation details a bit too heavily.
   
   As a result, the following improvements are in this commit:
   - Ensure that, whenever possible, we tell the user the actual command
     that is holding a given lock instead of the lock name (an internal
     implementation detail)
   - Make the locking error output a little more consistent and user
     friendly
   - Add a `DownloadLock` class to simplify locking downloads
   - Add a `HOMEBREW_LOCK_CONTEXT` variable to allow adding additional
     context for logging error messages
   - Lock paths and leave deciding how this translates to lock names up
     to the locking code itself
   - Lock the Cellar/Caskroom paths explicitly rather than implicitly
   
   Co-authored-by: Carlo Cabrera <[email protected]>

   

   MikeMcQuaid and carlocab committed Jul 30, 2024
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