nixpkgs/nixos/modules/profiles/installation-device.nix

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# 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.
services.nixosManual.enable = mkForce true;
# Show the manual.
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.
security.sudo.enable = false;
# Automatically log in at the virtual consoles.
services.mingetty.autologinUser = "root";
# Some more help text.
services.mingetty.helpLine =
''
The "root" account has an empty password. ${
2013-01-22 11:52:13 +00:00
optionalString config.services.xserver.enable
"Type `systemctl start display-manager' to\nstart the graphical user interface."}
'';
# Allow sshd to be started manually through "start sshd".
services.openssh.enable = true;
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 = "100000";
# 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. Archive::Cpio is needed for
# the initrd builder.
system.extraDependencies = [ pkgs.stdenv pkgs.busybox pkgs.perlPackages.ArchiveCpio ];
# 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.
boot.consoleLogLevel = mkDefault 7;
networking.firewall.logRefusedConnections = mkDefault false;
environment.systemPackages = [ pkgs.vim ];
};
}