John Ericson bec4da9e26 NarCache improvements
- Separate implementation, abstract implements

- `NarCache` work in constant memory

  This is using `RestoreSink` to dedup some write-side IO, but I am not
  so sure that is a good idea. We'll continue reworking it.

- Use pathlocks to avoid download storms

- Use `Descriptor`-based logic, not `pathExists` to avoid symlink races
  if anything is deleted.
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Nix

Open Collective supporters CI

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation and first steps

Visit nix.dev for installation instructions and beginner tutorials.

Full reference documentation can be found in the Nix manual.

Building and developing

Follow instructions in the Nix reference manual to set up a development environment and build Nix from source.

Contributing

Check the contributing guide if you want to get involved with developing Nix.

Additional resources

Nix was created by Eelco Dolstra and developed as the subject of his PhD thesis The Purely Functional Software Deployment Model, published 2006. Today, a world-wide developer community contributes to Nix and the ecosystem that has grown around it.

License

Nix is released under the LGPL v2.1.

Description
Nix, the purely functional package manager
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