mirror of
https://github.com/NiklasGollenstede/nixos-installer.git
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f56db19b5e
ZFS, encryption (keys, keystore, LUKS), bootFS, ephemeral root (tmpfs, ZFS, F2FS, ...), testing in qemu, options & debugging, ... and many small things
84 lines
4.7 KiB
Markdown
84 lines
4.7 KiB
Markdown
/*
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# System Defaults
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Things that really should be (more like) this by default.
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## Implementation
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```nix
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#*/# end of MarkDown, beginning of NixOS module:
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dirname: inputs: specialArgs@{ config, pkgs, lib, ... }: let inherit (inputs.self) lib; in let
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prefix = inputs.config.prefix;
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cfg = config.${prefix}.base;
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in {
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options.${prefix} = { base = {
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enable = lib.mkEnableOption "saner defaults";
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includeNixpkgs = lib.mkOption { description = "»nixpkgs« to include in the system build."; type = lib.types.nullOr lib.types.package; default = null; };
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}; };
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config = let
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hash = builtins.substring 0 8 (builtins.hashString "sha256" config.networking.hostName);
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implied = true; # some mount points are implied (and forced) to be »neededForBoot« in »specialArgs.utils.pathsNeededForBoot« (this marks those here)
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in lib.mkIf cfg.enable (lib.mkMerge [ ({
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users.mutableUsers = false; users.allowNoPasswordLogin = true; # Don't babysit. Can roll back or redeploy.
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networking.hostId = lib.mkDefault (builtins.substring 0 8 (builtins.hashString "sha256" config.networking.hostName));
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environment.etc."machine-id".text = lib.mkDefault (builtins.substring 0 32 (builtins.hashString "sha256" "${config.networking.hostName}:machine-id")); # this works, but it "should be considered "confidential", and must not be exposed in untrusted environments" (not sure _why_ though)
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documentation.man.enable = lib.mkDefault config.documentation.enable;
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}) ({
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# Robustness/debugging:
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boot.kernelParams = [ "panic=10" "boot.panic_on_fail" ]; # Reboot on kernel panic, panic if boot fails.
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# might additionally want to do this: https://stackoverflow.com/questions/62083796/automatic-reboot-on-systemd-emergency-mode
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systemd.extraConfig = "StatusUnitFormat=name"; # Show unit names instead of descriptions during boot.
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}) (lib.mkIf (cfg.includeNixpkgs != null) {
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nix.registry.nixpkgs.flake = cfg.includeNixpkgs;
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environment.etc."nix/channels/nixpkgs".source = cfg.includeNixpkgs.outPath;
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nix.nixPath = [ "nixpkgs=/etc/nix/channels/nixpkgs" "nixos-config=/etc/nixos" ];
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nix.extraOptions = "experimental-features = nix-command flakes"; # apparently, even nix 2.8 (in nixos-22.05) needs this
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environment.shellAliases = { "with" = ''nix-shell --run "bash --login" -p''; };
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system.extraSystemBuilderCmds = (if !specialArgs?inputs && !specialArgs.inputs?self then "" else ''
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ln -sT ${specialArgs.inputs.self.outPath} $out/config # (build input for reference)
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'');
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environment.systemPackages = [ pkgs.git ]; # necessary as external dependency when working with flakes
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}) ({
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# Free convenience:
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programs.bash.promptInit = lib.mkDefault ''
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# Provide a nice prompt if the terminal supports it.
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if [ "''${TERM:-}" != "dumb" ] ; then
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if [[ "$UID" == '0' ]] ; then if [[ ! "''${SUDO_USER:-}" ]] ; then # direct root: red username + green hostname
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PS1='\[\e[0m\]\[\e[48;5;234m\]\[\e[96m\]$(printf "%-+ 4d" $?)\[\e[93m\][\D{%Y-%m-%d %H:%M:%S}] \[\e[91m\]\u\[\e[97m\]@\[\e[92m\]\h\[\e[97m\]:\[\e[96m\]\w'"''${TERM_RECURSION_DEPTH:+\[\e[91m\]["$TERM_RECURSION_DEPTH"]}"'\[\e[24;97m\]\$ \[\e[0m\]'
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else # sudo root: red username + red hostname
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PS1='\[\e[0m\]\[\e[48;5;234m\]\[\e[96m\]$(printf "%-+ 4d" $?)\[\e[93m\][\D{%Y-%m-%d %H:%M:%S}] \[\e[91m\]\u\[\e[97m\]@\[\e[91m\]\h\[\e[97m\]:\[\e[96m\]\w'"''${TERM_RECURSION_DEPTH:+\[\e[91m\]["$TERM_RECURSION_DEPTH"]}"'\[\e[24;97m\]\$ \[\e[0m\]'
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fi ; else # other user: green username + green hostname
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PS1='\[\e[0m\]\[\e[48;5;234m\]\[\e[96m\]$(printf "%-+ 4d" $?)\[\e[93m\][\D{%Y-%m-%d %H:%M:%S}] \[\e[92m\]\u\[\e[97m\]@\[\e[92m\]\h\[\e[97m\]:\[\e[96m\]\w'"''${TERM_RECURSION_DEPTH:+\[\e[91m\]["$TERM_RECURSION_DEPTH"]}"'\[\e[24;97m\]\$ \[\e[0m\]'
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fi
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if test "$TERM" = "xterm" ; then
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PS1="\[\033]2;\h:\u:\w\007\]$PS1"
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fi
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fi
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export TERM_RECURSION_DEPTH=$(( 1 + ''${TERM_RECURSION_DEPTH:-0} ))
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''; # The non-interactive version of bash does not remove »\[« and »\]« from PS1, but without those the terminal gets confused about the cursor position after the prompt once one types more than a bit of text there, at least via serial or SSH.
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environment.interactiveShellInit = lib.mkDefault ''
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if [[ "$(realpath /dev/stdin)" == /dev/ttyS* && $LINES == 24 && $COLUMNS == 80 ]] ; then
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stty rows 34 cols 145 # Fairly large font on 1080p. Definitely a better default than 24x80.
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fi
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'';
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}) ]);
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}
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