Funded by the European Commission under the Next Generation Internet initiative
- Package Lightmeter for NixOS
- Allow usage of Lightmeter through the module system for NixOS
As of 2020, September 16, this flake is in a working state and achieving all of its objectives.
Instructions were last updated on 2020, September 16.
If you are using Nix 2.x, compatibility is provided through github:edolstra/flake-compat, as such the package can be built with just nix-build in the current directory or more verbosely, nix-build -A packages.x86_64-linux.lightmeter. If you do not want to clone the repository, then you can add the repository into NIX_PATH by including -I lightmeter=https://github.com/ngi-nix/lightmeter/tarball/master '<lightmeter>' which can also be pinned at a certain commit, such as a32bfe25a5c8bafa0297a75327693b13240723ea.
If you are using Nix 3.x, cloning the repository isn't needed and one can just run nix build github:ngi-nix/lightmeter or more verbosely, nix build --print-build-logs github:ngi-nix/lightmeter#packages.x86_64-linux.lightmeter.
To enable the lightmeter module in NixOS, you will have to use lightmeter.nix and package in lightmeter.nix
This will only cover the flake-based approach (Nix 3.x), but can be expanded for Nix 2.x compatibility.
To include github:ngi-nix/lightmeter into your flake, you will first have to include it as an input like the following
{
#...
# Can be consistently pinned at a certain revision with `rev = ""`
inputs.lightmeter = { type = "github"; owner = "ngi-nix"; repo = "lightmeter"; };
#...
# Or just `{ self, nixpkgs, lightmeter }` but that doesn't cover all cases
outputs = { self, nixpkgs, ... }@inputs:
#...
}Before including the module and overlay into the system configuration
{
#...
nixosConfigurations.<name> = nixpkgs.lib.nixosSystem {
system = "<system>";
modules = [
#...
({ ... }: {
# Or just `imports = [ inputs.lightmeter.nixosModules.lightmeter ]`
imports = builtins.attrValues inputs.lightmeter.nixosModules;
nixpkgs.overlays = [ inputs.lightmeter.overlay ];
})
#...
];
};
#...
}In which you can enable the service afterwards
{
#...
nixosConfigurations.<name> = nixpkgs.lib.nixosSystem {
system = "<system>";
modules = [
#...
({ ... }: {
services.lightmeter.enable = true;
# Or to watch a file use the following command
# services.lightmeter.flags.watch_file = "/etc/postfix/mail.log";
services.lightmeter.flags.watch_dir = "/etc/postfix";
})
#...
];
};
#...
}See REVIEW.md