Suggestions for CONTRIBUTING

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Michael Peyton Jones 2018-07-17 13:39:49 +01:00 committed by Jörg Thalheim
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commit e9d8b30995

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Profiles should favor usability and stability, so performance hacks should be
activated by an additional NixOS option or conservative and performance configs
can be declared in separate profiles.
# Writing profiles
Because profiles can only be tested with the appropriate hardware, quality
assurance is up to *you*.
When setting an option, use `lib.mkDefault` unless:
- The option *must* be set and the user should get an error if they try to override it.
- The setting should merge with the user's settings (typical for list or set options).
For example:
```nix
{ lib }: {
# Using mkDefault, because the user might want to disable tlp
services.tlp.enable = lib.mkDefault true;
# No need to use mkDefault, because the setting will merge with the user's setting
boot.kernelModules = [ "tmp_smapi" ];
}
```
Try to avoid "opinionated" settings relating to optional features like sound, bluetooth, choice of bootloader etc.
Where possible, use module imports to share code between similar hardware variants.
# Performance
Profiles should favor usability and stability, so performance improvements should either be conservative or
be guarded behind additional NixOS module options.
If it makes sense to have a performance-focussed config, it can be declared in a separate profile.
# Testing
Because profiles can only be tested with the appropriate hardware, quality assurance is up to *you*.