Commits on Sep 9, 2023

1. Unlock output paths when a derivation is already built …

   Without this change, nix build processes will not drop the locks for derivation goals
   which have already been built by another process when the current process gets
   round to building them. This means the locks are held until the process
   terminates.
   
   If there are other nix build processes in a similar state, they will also try to
   acquire the same locks when they try to build the same derivation, and so will
   wait until the lock holder terminates (which might be a very long time if it has
   a lot to build). In some pathological cases, those processes might be holding
   their own locks on other derivations due to the same issue, and this can lead to
   deadlock.
   
   Resolves NixOS#6468

   

   gbpdt committed Sep 9, 2023
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