nix-dotfiles/home/programs/nix-index/fetch-nix-index-database.nix

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{ config, pkgs, lib, ... }:
let
cfg = config.programs.nix-index;
in
{
options.programs.nix-index.enableDatabaseFetcher = lib.mkEnableOption "timed unit that fetches an updated database of nixpkgs outputs";
config = {
systemd.user.timers.fetch-nix-index-database = lib.mkIf cfg.enableDatabaseFetcher {
Unit = {
Description = "Fetch nix-index database";
Documentation = [ "https://github.com/nix-community/nix-index-database" ];
};
Timer = {
Unit = "fetch-nix-index-database.service";
OnCalendar = "weekly";
Persistent = true;
};
Install = {
WantedBy = [ "timers.target" ];
};
};
systemd.user.services.fetch-nix-index-database = lib.mkIf cfg.enableDatabaseFetcher {
Unit = {
Description = "Fetch nix-index database";
Documentation = [ "https://github.com/nix-community/nix-index-database" ];
};
Service = {
Type = "oneshot";
ExecStart = lib.getExe (pkgs.writeShellApplication {
name = "fetch-nix-index-database";
runtimeInputs = with pkgs; [
gnused
wget
];
# Source: https://github.com/nix-community/nix-index-database?tab=readme-ov-file#ad-hoc-download
# Slightly modified to satisfy shellcheck
text = ''
download_nixpkgs_cache_index () {
filename="index-$(uname -m | sed 's/^arm64$/aarch64/')-$(uname | tr '[:upper:]' '[:lower:]')"
mkdir -p "${config.home.homeDirectory}/.cache/nix-index" && cd "${config.home.homeDirectory}/.cache/nix-index"
# -N will only download a new version if there is an update.
wget -q -N "https://github.com/nix-community/nix-index-database/releases/latest/download/$filename"
ln -f "$filename" files
}
download_nixpkgs_cache_index
'';
});
};
};
};
}