Raito Bezarius b7be40c785 libstore/build: fix starvation during substitution
When the destructor of PathSubstitutionGoal is run, this happens in a
sync context and can cause starvation of all ongoing IO w.r.t. to other
substitutions, including our own substitution.

While there's only a decompressor thread per stream, the other side of
the IO runs on the event loop.

In order to fix this, it is sufficient to remove the thread indirection
and inline the async code.

Fixes #1126. Great thanks to horrors' patience.

Co-authored-by: eldritch horrors <pennae@lix.systems>
Change-Id: I3eb37bc37d156f0f5528364e568fdaa2ced58011
Signed-off-by: Raito Bezarius <raito@lix.systems>
(cherry picked from commit 505d0669dc)
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Lix

Lix is an implementation of Nix, a powerful package management system for Linux and other Unix systems that makes package management reliable and reproducible.

Read more about us at https://lix.systems.

Installation

On Linux and macOS the easiest way to install Lix is to run the following shell command (as a user other than root):

$ curl -sSf -L https://install.lix.systems/lix | sh -s -- install

For systems that already have a Nix implementation installed, such as NixOS systems, read our install page

Building And Developing

See our Hacking guide in our manual for instruction on how to set up a development environment and build Lix from source.

Additional Resources

License

Lix is released under LGPL-2.1-or-later.

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Description
Working fork of Lix - carries the adaptive load-aware build-remote patch. Upstream: gerrit.lix.systems
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