forked from extern/nixos-installer
63 lines
3.1 KiB
Markdown
63 lines
3.1 KiB
Markdown
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/*
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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: { 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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}; };
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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 = (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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}) ({
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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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}) ({
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# Free convenience:
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# The non-interactive version of bash does not remove »\[« and »\]« from PS1. Seems to work just fine without those. So make the prompt pretty (and informative):
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programs.bash.promptInit = ''
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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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'';
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}) ]);
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}
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