nixpkgs/nixos/modules/profiles/installation-device.nix
worldofpeace 397c7d26fc installer: Don't run as root
There's many reason why it is and is going to
continue to be difficult to do this:

1. All display-managers (excluding slim) default PAM rules
   disallow root auto login.

2. We can't use wayland

3. We have to use system-wide pulseaudio

4. It could break applications in the session.
   This happened to dolphin in plasma5
   in the past.

This is a growing technical debt, let's just use
passwordless sudo.
2019-08-12 14:45:27 -04:00

107 lines
3.5 KiB
Nix

# Provide a basic configuration for installation devices like CDs.
{ config, pkgs, lib, ... }:
with lib;
{
imports =
[ # Enable devices which are usually scanned, because we don't know the
# target system.
../installer/scan/detected.nix
../installer/scan/not-detected.nix
# Allow "nixos-rebuild" to work properly by providing
# /etc/nixos/configuration.nix.
./clone-config.nix
# Include a copy of Nixpkgs so that nixos-install works out of
# the box.
../installer/cd-dvd/channel.nix
];
config = {
# Enable in installer, even if the minimal profile disables it.
documentation.enable = mkForce true;
# Show the manual.
documentation.nixos.enable = mkForce true;
services.nixosManual.showManual = true;
# Let the user play Rogue on TTY 8 during the installation.
#services.rogue.enable = true;
# Disable some other stuff we don't need.
services.udisks2.enable = mkDefault false;
# Use less privileged nixos user
users.users.nixos = {
isNormalUser = true;
extraGroups = [ "wheel" "networkmanager" "video" ];
# Allow the graphical user to login without password
initialHashedPassword = "";
};
# Allow the user to log in as root without a password.
users.users.root.initialHashedPassword = "";
# Allow passwordless sudo from nixos user
security.sudo = {
enable = mkDefault true;
wheelNeedsPassword = mkForce false;
};
# Automatically log in at the virtual consoles.
services.mingetty.autologinUser = "nixos";
# Some more help text.
services.mingetty.helpLine =
''
The "nixos" and "root" account have empty passwords. ${
optionalString config.services.xserver.enable
"Type `sudo systemctl start display-manager' to\nstart the graphical user interface."}
'';
# Allow sshd to be started manually through "systemctl start sshd".
services.openssh = {
enable = true;
# Allow password login to the installation, if the user sets a password via "passwd"
# It is safe as root doesn't have a password by default and SSH is disabled by default
permitRootLogin = "yes";
};
systemd.services.sshd.wantedBy = mkOverride 50 [];
# Enable wpa_supplicant, but don't start it by default.
networking.wireless.enable = mkDefault true;
systemd.services.wpa_supplicant.wantedBy = mkOverride 50 [];
# Tell the Nix evaluator to garbage collect more aggressively.
# This is desirable in memory-constrained environments that don't
# (yet) have swap set up.
environment.variables.GC_INITIAL_HEAP_SIZE = "1M";
# Make the installer more likely to succeed in low memory
# environments. The kernel's overcommit heustistics bite us
# fairly often, preventing processes such as nix-worker or
# download-using-manifests.pl from forking even if there is
# plenty of free memory.
boot.kernel.sysctl."vm.overcommit_memory" = "1";
# To speed up installation a little bit, include the complete
# stdenv in the Nix store on the CD.
system.extraDependencies = with pkgs;
[
stdenv
stdenvNoCC # for runCommand
busybox
jq # for closureInfo
];
# Show all debug messages from the kernel but don't log refused packets
# because we have the firewall enabled. This makes installs from the
# console less cumbersome if the machine has a public IP.
networking.firewall.logRefusedConnections = mkDefault false;
};
}