349d2c58e5
With "truncate" mode, if we try to write to the database while another process has an active write transaction, we'll block until the other transaction finishes. This is a problem for the evaluation cache in particular, since it uses long-running transactions. WAL mode does not have this issue: it just returns "busy" right away, so Nix will print error (ignored): SQLite database '/home/eelco/.cache/nix/eval-cache-v5/...' is busy and stop trying to write to the evaluation cache. (This was the intended/original behaviour, see AttrDb::doSQLite().)
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.