2400191caf
Back in 2013, update-mime-database started using fdatasync() to write out its changes after processing each file in /share/mime, with the reasoning that a corrupted database from an interruption midway would be problematic for applications[1]. Unfortunately, this caused a significant regression in the time required to run update-mime-database: commonly from under a second to half a minute or more. This delay affects the time required to build system-path on NixOS, when xdg.mime.enable is true (the default). For example, on one of my systems system-path builds in ~48 seconds, 45 of which are update-mime-database. This makes rapidly building new system configurations not fun. This commit disables the calls to fdatasync(). update-mime-database checks an environment variable, PKGSYSTEM_ENABLE_FSYNC, to determine whether it should sync, and we can set this to false. system-path already only has whatever filesystem commit guarantees that the Nix builder provides. Furthermore, there is no risk of a failed MIME database update messing up existing packages, because this is Nix. (This issue was also reported at and discussed by Debian, Red Hat, and Gentoo at least.) [1] https://bugs.freedesktop.org/show_bug.cgi?id=70366 |
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| .github | ||
| doc | ||
| lib | ||
| maintainers | ||
| nixos | ||
| pkgs | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .version | ||
| COPYING | ||
| default.nix | ||
| README.md | ||
Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the Hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:
% git remote add channels https://github.com/NixOS/nixpkgs-channels.git
For stability and maximum binary package support, it is recommended to maintain
custom changes on top of one of the channels, e.g. nixos-19.03 for the latest
release and nixos-unstable for the latest successful build of master:
% git remote update channels
% git rebase channels/nixos-19.03
For pull requests, please rebase onto nixpkgs master.
NixOS Linux distribution source code is located inside
nixos/ folder.
- NixOS installation instructions
- Documentation (Nix Expression Language chapter)
- Manual (How to write packages for Nix)
- Manual (NixOS)
- Community maintained wiki
- Continuous package builds for unstable/master
- Continuous package builds for 19.03 release
- Tests for unstable/master
- Tests for 19.03 release
Communication:
Note: MIT license does not apply to the packages built by Nixpkgs, merely to the package descriptions (Nix expressions, build scripts, and so on). It also might not apply to patches included in Nixpkgs, which may be derivative works of the packages to which they apply. The aforementioned artifacts are all covered by the licenses of the respective packages.