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John Ericson 9f9723b179 nixpkgs module: Fix defaulting of localSystem and system 
Take two of #40708 (4fe2898608).

That PR attempted to bidirectionally default `config.nixpkgs.system` and
`config.nixpkgs.localSystem.system` to each be updated by the other. But
this is not possible with the way the module system works. Divergence in
certain cases in inevitable.

This PR is more conservative and just has `system` default `localSystem`
and `localSystem` make the final call as-is. This solves a number of
issues.

 - `localSystem` completely overrides `system`, just like with nixpkgs
 proper. There is no need to specify `localSystem.system` to clobber the
 old system.

 - `config.nixpkgs.localSystem` is exactly what is passed to nixpkgs. No
 spooky steps.

 - `config.nixpkgs.localSystem` is elaborated just as nixpkgs would so
 that all attributes are available, not just the ones the user
 specified.

The remaining issue is just that `config.nixpkgs.system` doesn't update
based on `config.nixpkgs.localSystem.system`. It should never be
referred to lest it is a bogus stale value because
`config.nixpkgs.localSystem` overwrites it.

Fixes #46320
2018-09-07 16:43:56 -04:00
.github treewide: remove mailing list references 2018-08-23 09:24:44 -07:00
doc top-level: Deprecate top-level {build,host,target}Platform 2018-09-05 11:53:51 -04:00
lib Merge pull request #45038 from symphorien/optopt 2018-08-30 20:08:45 +02:00
maintainers Merge pull request #45730 from Helkafen/snakemake 2018-09-02 07:54:13 -07:00
nixos nixpkgs module: Fix defaulting of localSystem and system 2018-09-07 16:43:56 -04:00
pkgs top-level, stdenv: Make system and stdenv.system describe the hostPlatform. 2018-09-06 08:33:51 -04:00
.dir-locals.el .dir-locals.el: init 2018-07-06 12:48:43 -04:00
.editorconfig Revert ".version: remove final newline" 2018-04-28 14:23:13 +02:00
.gitattributes gitattributes: disable merge=union in all-packages 2018-03-27 11:03:03 -05:00
.gitignore kde5: consolidate packages into desktops/kde-5 2016-03-01 10:36:00 -06:00
.version Revert ".version: remove final newline" 2018-04-28 14:23:13 +02:00
COPYING 2018 will be the year of NixOS 2018-01-04 17:59:52 -05:00
default.nix Reference a local copy of the release notes in the 'version too old' warning, plus a redirect to the support links 2018-08-30 09:05:57 -04:00
README.md treewide: remove mailing list references 2018-08-23 09:24:44 -07:00

README.md

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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-18.03 for the latest release and nixos-unstable for the latest successful build of master:

% git remote update channels
% git rebase channels/nixos-18.03

For pull-requests, please rebase onto nixpkgs master.

NixOS Linux distribution source code is located inside nixos/ folder.

Communication: