374e6bcc40
Format all Nix files using the officially approved formatter,
making the CI check introduced in the previous commit succeed:
nix-build ci -A fmt.check
This is the next step of the of the [implementation](https://github.com/NixOS/nixfmt/issues/153)
of the accepted [RFC 166](https://github.com/NixOS/rfcs/pull/166).
This commit will lead to merge conflicts for a number of PRs,
up to an estimated ~1100 (~33%) among the PRs with activity in the past 2
months, but that should be lower than what it would be without the previous
[partial treewide format](https://github.com/NixOS/nixpkgs/pull/322537).
Merge conflicts caused by this commit can now automatically be resolved while rebasing using the
[auto-rebase script](8616af08d9/maintainers/scripts/auto-rebase).
If you run into any problems regarding any of this, please reach out to the
[formatting team](https://nixos.org/community/teams/formatting/) by
pinging @NixOS/nix-formatting.
107 lines
2.8 KiB
Nix
107 lines
2.8 KiB
Nix
/*
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Manages the things that are needed for a traditional nix-channel based
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configuration to work.
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See also
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- ./nix.nix
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- ./nix-flakes.nix
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*/
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{ config, lib, ... }:
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let
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inherit (lib)
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mkDefault
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mkIf
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mkOption
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stringAfter
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types
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;
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cfg = config.nix;
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in
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{
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options = {
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nix = {
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channel = {
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enable = mkOption {
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description = ''
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Whether the `nix-channel` command and state files are made available on the machine.
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The following files are initialized when enabled:
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- `/nix/var/nix/profiles/per-user/root/channels`
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- `/root/.nix-channels`
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- `$HOME/.nix-defexpr/channels` (on login)
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Disabling this option will not remove the state files from the system.
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'';
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type = types.bool;
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default = true;
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};
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};
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nixPath = mkOption {
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type = types.listOf types.str;
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default =
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if cfg.channel.enable then
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[
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"nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos"
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"nixos-config=/etc/nixos/configuration.nix"
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"/nix/var/nix/profiles/per-user/root/channels"
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]
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else
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[ ];
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defaultText = ''
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if nix.channel.enable
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then [
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"nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos"
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"nixos-config=/etc/nixos/configuration.nix"
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"/nix/var/nix/profiles/per-user/root/channels"
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]
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else [];
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'';
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description = ''
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The default Nix expression search path, used by the Nix
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evaluator to look up paths enclosed in angle brackets
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(e.g. `<nixpkgs>`).
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'';
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};
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};
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system = {
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defaultChannel = mkOption {
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internal = true;
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type = types.str;
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default = "https://nixos.org/channels/nixos-unstable";
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description = "Default NixOS channel to which the root user is subscribed.";
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};
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};
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};
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config = mkIf cfg.enable {
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environment.extraInit = mkIf cfg.channel.enable ''
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if [ -e "$HOME/.nix-defexpr/channels" ]; then
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export NIX_PATH="$HOME/.nix-defexpr/channels''${NIX_PATH:+:$NIX_PATH}"
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fi
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'';
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environment.extraSetup = mkIf (!cfg.channel.enable) ''
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rm --force $out/bin/nix-channel
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'';
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# NIX_PATH has a non-empty default according to Nix docs, so we don't unset
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# it when empty.
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environment.sessionVariables = {
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NIX_PATH = cfg.nixPath;
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};
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systemd.tmpfiles.rules = lib.mkIf cfg.channel.enable [
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''f /root/.nix-channels - - - - ${config.system.defaultChannel} nixos\n''
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];
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system.activationScripts.no-nix-channel = mkIf (!cfg.channel.enable) (
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stringAfter [ "etc" "users" ] (builtins.readFile ./nix-channel/activation-check.sh)
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);
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};
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}
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