6c1bb54483
were obtained from the NixOS channel. "nixos-install" copies this to the installed system as well. * In the installation CD, set GC_INITIAL_HEAP_SIZE to a low value for the benefit of memory-constrained environments. svn path=/nixos/trunk/; revision=33887
144 lines
4.4 KiB
Nix
144 lines
4.4 KiB
Nix
# Provide a basic configuration for installation devices like CDs.
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{ config, pkgs, modules, ... }:
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with pkgs.lib;
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let
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# Location of the repository on the harddrive
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nixosPath = toString ../..;
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# Check if the path is from the NixOS repository
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isNixOSFile = path:
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let s = toString path; in
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removePrefix nixosPath s != s;
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# Copy modules given as extra configuration files. Unfortunately, we
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# cannot serialized attribute set given in the list of modules (that's why
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# you should use files).
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moduleFiles =
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filter isPath modules;
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# Partition module files because between NixOS and non-NixOS files. NixOS
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# files may change if the repository is updated.
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partitionedModuleFiles =
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let p = partition isNixOSFile moduleFiles; in
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{ nixos = p.right; others = p.wrong; };
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# Path transformed to be valid on the installation device. Thus the
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# device configuration could be rebuild.
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relocatedModuleFiles =
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let
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relocateNixOS = path:
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"<nixos" + removePrefix nixosPath (toString path) + ">";
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relocateOthers = null;
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in
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{ nixos = map relocateNixOS partitionedModuleFiles.nixos;
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others = []; # TODO: copy the modules to the install-device repository.
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};
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# A dummy /etc/nixos/configuration.nix in the booted CD that
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# rebuilds the CD's configuration (and allows the configuration to
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# be modified, of course, providing a true live CD). Problem is
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# that we don't really know how the CD was built - the Nix
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# expression language doesn't allow us to query the expression being
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# evaluated. So we'll just hope for the best.
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configClone = pkgs.writeText "configuration.nix"
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''
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{ config, pkgs, ... }:
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{
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require = [
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${toString config.installer.cloneConfigIncludes}
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];
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}
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'';
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in
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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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];
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options = {
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installer.cloneConfig = mkOption {
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default = true;
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description = ''
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Try to clone the installation-device configuration by re-using it's
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profile from the list of imported modules.
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'';
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};
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installer.cloneConfigIncludes = mkOption {
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default = [];
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example = [ "./nixos/modules/hardware/network/rt73.nix" ];
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description = ''
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List of modules used to re-build this installation device profile.
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'';
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};
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};
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config = {
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installer.cloneConfigIncludes =
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relocatedModuleFiles.nixos ++ relocatedModuleFiles.others;
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# Show the manual.
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services.nixosManual.showManual = true;
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# Let the user play Rogue on TTY 8 during the installation.
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services.rogue.enable = true;
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# Disable some other stuff we don't need.
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security.sudo.enable = false;
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# Include only the en_US locale. This saves 75 MiB or so compared to
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# the full glibcLocales package.
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i18n.supportedLocales = ["en_US.UTF-8/UTF-8" "en_US/ISO-8859-1"];
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boot.postBootCommands =
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''
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# Provide a mount point for nixos-install.
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mkdir -p /mnt
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${optionalString config.installer.cloneConfig ''
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# Provide a configuration for the CD/DVD itself, to allow users
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# to run nixos-rebuild to change the configuration of the
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# running system on the CD/DVD.
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cp ${configClone} /etc/nixos/configuration.nix
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''}
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'';
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# Some more help text.
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services.mingetty.helpLine =
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''
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Log in as "root" with an empty password. ${
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if config.services.xserver.enable then
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"Type `start xserver' to start\nthe graphical user interface."
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else ""
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}
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'';
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# Allow sshd to be started manually through "start sshd". It should
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# not be started by default on the installation CD because the
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# default root password is empty.
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services.openssh.enable = true;
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jobs.sshd.startOn = pkgs.lib.mkOverride 50 "";
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# Enable wpa_supplicant, but don't start it by default.
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networking.wireless.enable = true;
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jobs.wpa_supplicant.startOn = pkgs.lib.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.shellInit =
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''
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export GC_INITIAL_HEAP_SIZE=100000
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'';
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};
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}
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