nixpkgs/nixos
Nicolas B. Pierron f5dfe78a1e Add overlays mechanism to Nixpkgs.
This patch add a new argument to Nixpkgs default expression named "overlays".

By default, the value of the argument is either taken from the environment variable `NIXPKGS_OVERLAYS`,
or from the directory `~/.nixpkgs/overlays/`.  If the environment variable does not name a valid directory
then this mechanism would fallback on the home directory.  If the home directory does not exists it will
fallback on an empty list of overlays.

The overlays directory should contain the list of extra Nixpkgs stages which would be used to extend the
content of Nixpkgs, with additional set of packages.  The overlays, i-e directory, files, symbolic links
are used in alphabetical order.

The simplest overlay which extends Nixpkgs with nothing looks like:

```nix
self: super: {
}
```

More refined overlays can use `super` as the basis for building new packages, and `self` as a way to query
the final result of the fix-point.

An example of overlay which extends Nixpkgs with a small set of packages can be found at:
  https://github.com/nbp/nixpkgs-mozilla/blob/nixpkgs-overlay/moz-overlay.nix

To use this file, checkout the repository and add a symbolic link to
the `moz-overlay.nix` file in `~/.nixpkgs/overlays` directory.
2017-01-16 01:17:33 +01:00
..
doc/manual Add overlays mechanism to Nixpkgs. 2017-01-16 01:17:33 +01:00
lib test-driver: support punctuation in sendChars 2017-01-08 09:17:05 -05:00
maintainers create-amis: use jq instead of json 2016-11-22 01:59:49 +01:00
modules nixos/clamav: set "clamav" user's primary group to "clamav" 2017-01-15 22:56:34 +01:00
tests Merge pull request #21882 from abbradar/dhcp6 2017-01-15 19:53:33 +03:00
COPYING Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
default.nix nix: Add a "dev" output 2016-04-18 21:13:18 +02:00
README Move all of NixOS to nixos/ in preparation of the repository merge 2013-10-10 13:28:20 +02:00
release-combined.nix nixos/tests/kde5: rename from sddm-kde5 and run by default 2016-09-09 10:12:38 -05:00
release-small.nix release-small: drop mysql51, removed in 975d33e6 2016-08-13 09:46:42 +02:00
release.nix nixos/glance: add test 2016-12-31 09:36:57 +01:00

*** NixOS ***

NixOS is a Linux distribution based on the purely functional package
management system Nix.  More information can be found at
http://nixos.org/nixos and in the manual in doc/manual.