nix/module/common/Nix.nix

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{ pkgs, ... }: {
environment.variables = {
# Allow running of proprietary software.
NIXPKGS_ALLOW_UNFREE = "1";
# I use this env variable to get currently running architecture.
NIX_CURRENT_SYSTEM = "${pkgs.stdenv.system}";
};
# Allow installation of proprietary software.
nixpkgs.config.allowUnfree = true;
# Deduplicate store automatically. Slows down switches a bit, but saves space.
nix.settings.auto-optimise-store = true;
# Extra configuration line-by-line:
# 1. Allow use of flakes.
# 2. When running GC, keep .drv files.
# 3. When running GC, keep build dependencies.
# 4. Run GC automatically when there's a 50 GB or less free space.
nix.extraOptions = ''
experimental-features = nix-command flakes
keep-derivations = true
keep-outputs = true
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min-free = ${toString (50 * 1000 * 1000 * 1000)}
'';
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# NOTE: Currently I run GC completely, but this setting (put above near min-free)
# can stop GC when you hit 101 GB of free space available.
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# max-free = ${toString 101 * 1024 * 1024 * 1024}
# NOTE: Enable this if you want to run GC on schedule. I instead use `min-free`.
# nix.gc = {
# automatic = true;
# dates = "weekly";
# options = "--delete-older-than 30d";
# persistent = true;
# };
}