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Nix, the purely functional package manager
aef431fbd1
## Motivation Nix currently hard fails if a substituter is inaccessible, even when they are other substituters available, unless `fallback = true`. This breaks nix build, run, shell et al entirely. This would modify the default behaviour so that nix would actually use the other available substituters and not hard error. Here is an example before vs after when using dotenv where I have manually stopped my own cache to trigger this issue, before and after the patch. The initial error is really frustrating because there is other caches available.   ## Context https://github.com/NixOS/nix/issues/3514#issuecomment-2905056198 is the earliest issue I could find, but there are many duplicates. There is an initial PR at https://github.com/NixOS/nix/pull/7188, but this appears to have been abandoned - over 2 years with no activity, then a no comment review in jan. There was a subsequent PR at https://github.com/NixOS/nix/pull/8983 but this was closed without merge - over a year without activity. <!-- Non-trivial change: Briefly outline the implementation strategy. --> I have visualised the current and proposed flows. I believe my logic flows line up with what is suggested in https://github.com/NixOS/nix/pull/7188#issuecomment-1375652870 but correct me if I am wrong. Current behaviour:  Proposed behaviour:  [Charts in lucid](https://lucid.app/lucidchart/1b51b08d-6c4f-40e0-bf54-480df322cccf/view) <!-- Invasive change: Discuss alternative designs or approaches you considered. --> Possible issues to think about: - I could not figure out where the curl error is created... I can't figure out how to swallow it and turn it into a warn or better yet, a debug log. - Unfortunately, in contrast with the previous point, I'm not sure how verbose we want to warns/traces to be - personally I think that the warn that a substituter has been disabled (when it happens) is sufficient, and that the next one is being used, but this is personal preference. |
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Nix
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.
- The Nix, Nixpkgs, NixOS Community on nixos.org
- Official documentation on nix.dev
- Nixpkgs is the largest, most up-to-date free software repository in the world
- NixOS is a Linux distribution that can be configured fully declaratively
- Discourse
- Matrix: #users:nixos.org for user support and #nix-dev:nixos.org for development
License
Nix is released under the LGPL v2.1.