66 lines
1.8 KiB
Nix
66 lines
1.8 KiB
Nix
{ config, lib, pkgs, inputs, ... }:
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let
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asGB = size: toString (size * 1024 * 1024);
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in
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{
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nix = {
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settings.trusted-public-keys = [
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"nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
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];
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settings.substituters = [
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"https://nix-community.cachix.org"
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];
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# Hard-link duplicated files
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settings.auto-optimise-store = true;
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# auto-free the /nix/store
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settings.min-free = asGB 10;
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settings.max-free = asGB 200;
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# users in trusted group are trusted by the nix-daemon
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settings.trusted-users = [ "@trusted" ];
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# useful for ad-hoc nix-shell's for debugging
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nixPath = [ "nixpkgs=${pkgs.path}" ];
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gc.automatic = true;
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gc.options = "--delete-older-than 14d";
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};
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# Sometimes it fails if a store path is still in use.
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# This should fix intermediate issues.
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systemd.services.nix-gc.serviceConfig = {
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Restart = "on-failure";
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};
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# inputs == flake inputs in configurations.nix
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environment.etc = let
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inputsWithDate = lib.filterAttrs (_: input: input ? lastModified) inputs;
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flakeAttrs = input: (lib.mapAttrsToList (n: v: ''${n}="${v}"'')
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(lib.filterAttrs (n: v: (builtins.typeOf v) == "string") input));
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lastModified = name: input: ''
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flake_input_last_modified{input="${name}",${lib.concatStringsSep "," (flakeAttrs input)}} ${toString input.lastModified}
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'';
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in {
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"flake-inputs.prom" = {
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mode = "0555";
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text = ''
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# HELP flake_registry_last_modified Last modification date of flake input in unixtime
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# TYPE flake_input_last_modified gauge
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${lib.concatStringsSep "\n" (lib.mapAttrsToList lastModified inputsWithDate)}
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'';
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};
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};
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services.telegraf.extraConfig.inputs.file = [
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{
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data_format = "prometheus";
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files = [ "/etc/flake-inputs.prom" ];
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}
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];
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users.groups.trusted = { };
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}
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