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faq: outline how to override packages

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Fixes #1107
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Robert Helgesson 2020-03-22 13:13:09 +01:00
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FAQ.md
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@ -149,3 +149,50 @@ in
should work provided you have a Nix channel called `nixpkgs-unstable`.
Note, the package will not be affected by any package overrides,
overlays, etc.
How do I override the package used by a module?
-----------------------------------------------
By default Home Manager will install the package provided by your
chosen `nixpkgs` channel but occasionally you might end up needing to
change this package. This can typically be done in two ways.
1. If the module provides a `package` option, such as
`programs.beets.package`, then this is the recommended way to
perform the override. For example,
```
programs.beets.package = pkgs.beets.override { enableCheck = true; };
```
2. If no `package` option is available, then you can typically
override the relevant package using an [overlay][nixpkgs-overlays].
For example, if you want to use the `programs.skim` module but use
the `skim` package from Nixpkgs unstable, then a configuration like
```nix
{ pkgs, config, ... }:
let
pkgsUnstable = import <nixpkgs-unstable> {};
in
{
programs.skim.enable = true;
nixpkgs.overlays = [
(self: super: {
skim = pkgsUnstable.skim;
})
];
# …
}
```
should work OK.
[nixpkgs-overlays]: https://nixos.org/nixpkgs/manual/#chap-overlays