1f1a758e95
For non-interactive installation it's quite handy to be able to nix copy additional dependencies to the system. While this is possible for the root user, we cannot easily ssh into it, as we don't allow root login with a password. By making nixos a trusted user, we can do "passwd && sudo systemctl start sshd" and than run nixos-anywhere
128 lines
4.3 KiB
Nix
128 lines
4.3 KiB
Nix
# Provide a basic configuration for installation devices like CDs.
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{ config, pkgs, lib, ... }:
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with lib;
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{
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imports =
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[ # Enable devices which are usually scanned, because we don't know the
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# target system.
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../installer/scan/detected.nix
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../installer/scan/not-detected.nix
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# Allow "nixos-rebuild" to work properly by providing
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# /etc/nixos/configuration.nix.
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./clone-config.nix
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# Include a copy of Nixpkgs so that nixos-install works out of
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# the box.
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../installer/cd-dvd/channel.nix
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];
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config = {
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system.nixos.variant_id = lib.mkDefault "installer";
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# Enable in installer, even if the minimal profile disables it.
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documentation.enable = mkImageMediaOverride true;
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# Show the manual.
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documentation.nixos.enable = mkImageMediaOverride true;
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# Use less privileged nixos user
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users.users.nixos = {
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isNormalUser = true;
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extraGroups = [ "wheel" "networkmanager" "video" ];
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# Allow the graphical user to login without password
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initialHashedPassword = "";
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};
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# Allow the user to log in as root without a password.
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users.users.root.initialHashedPassword = "";
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# Allow passwordless sudo from nixos user
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security.sudo = {
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enable = mkDefault true;
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wheelNeedsPassword = mkImageMediaOverride false;
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};
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# Automatically log in at the virtual consoles.
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services.getty.autologinUser = "nixos";
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# Some more help text.
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services.getty.helpLine = ''
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The "nixos" and "root" accounts have empty passwords.
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To log in over ssh you must set a password for either "nixos" or "root"
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with `passwd` (prefix with `sudo` for "root"), or add your public key to
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/home/nixos/.ssh/authorized_keys or /root/.ssh/authorized_keys.
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If you need a wireless connection, type
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`sudo systemctl start wpa_supplicant` and configure a
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network using `wpa_cli`. See the NixOS manual for details.
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'' + optionalString config.services.xserver.enable ''
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Type `sudo systemctl start display-manager' to
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start the graphical user interface.
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'';
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# We run sshd by default. Login is only possible after adding a
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# password via "passwd" or by adding a ssh key to ~/.ssh/authorized_keys.
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# The latter one is particular useful if keys are manually added to
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# installation device for head-less systems i.e. arm boards by manually
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# mounting the storage in a different system.
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services.openssh = {
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enable = true;
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settings.PermitRootLogin = "yes";
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};
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# Enable wpa_supplicant, but don't start it by default.
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networking.wireless.enable = mkDefault true;
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networking.wireless.userControlled.enable = true;
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systemd.services.wpa_supplicant.wantedBy = mkOverride 50 [];
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# Tell the Nix evaluator to garbage collect more aggressively.
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# This is desirable in memory-constrained environments that don't
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# (yet) have swap set up.
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environment.variables.GC_INITIAL_HEAP_SIZE = "1M";
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# Make the installer more likely to succeed in low memory
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# environments. The kernel's overcommit heustistics bite us
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# fairly often, preventing processes such as nix-worker or
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# download-using-manifests.pl from forking even if there is
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# plenty of free memory.
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boot.kernel.sysctl."vm.overcommit_memory" = "1";
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# To speed up installation a little bit, include the complete
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# stdenv in the Nix store on the CD.
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system.extraDependencies = with pkgs;
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[
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stdenv
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stdenvNoCC # for runCommand
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busybox
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jq # for closureInfo
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# For boot.initrd.systemd
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makeInitrdNGTool
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systemdStage1
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systemdStage1Network
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];
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boot.swraid.enable = true;
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# Show all debug messages from the kernel but don't log refused packets
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# because we have the firewall enabled. This makes installs from the
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# console less cumbersome if the machine has a public IP.
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networking.firewall.logRefusedConnections = mkDefault false;
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# Prevent installation media from evacuating persistent storage, as their
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# var directory is not persistent and it would thus result in deletion of
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# those entries.
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environment.etc."systemd/pstore.conf".text = ''
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[PStore]
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Unlink=no
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'';
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# allow nix-copy to live system
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nix.settings.trusted-users = [ "root" "nixos" ];
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};
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}
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