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https://github.com/NixOS/nixpkgs.git
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29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
93 lines
2.5 KiB
Nix
93 lines
2.5 KiB
Nix
# This module creates a bootable ISO image containing the given NixOS
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# configuration. The derivation for the ISO image will be placed in
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# config.system.build.tarball.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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versionFile = pkgs.writeText "nixos-version" config.system.nixosVersion;
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in
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{
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options = {
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tarball.contents = mkOption {
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example =
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[ { source = pkgs.memtest86 + "/memtest.bin";
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target = "boot/memtest.bin";
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}
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];
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description = ''
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This option lists files to be copied to fixed locations in the
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generated ISO image.
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'';
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};
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tarball.storeContents = mkOption {
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example = [pkgs.stdenv];
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description = ''
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This option lists additional derivations to be included in the
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Nix store in the generated ISO image.
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'';
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};
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};
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config = {
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# In stage 1 of the boot, mount the CD/DVD as the root FS by label
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# so that we don't need to know its device.
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fileSystems = [ ];
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# boot.initrd.availableKernelModules = [ "mvsdio" "mmc_block" "reiserfs" "ext3" "ext4" ];
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# boot.initrd.kernelModules = [ "rtc_mv" ];
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# Closures to be copied to the Nix store on the CD, namely the init
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# script and the top-level system configuration directory.
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tarball.storeContents =
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[ { object = config.system.build.toplevel;
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symlink = "/run/current-system";
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}
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];
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# Individual files to be included on the CD, outside of the Nix
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# store on the CD.
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tarball.contents =
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[ { source = config.system.build.initialRamdisk + "/initrd";
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target = "/boot/initrd";
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}
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{ source = versionFile;
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target = "/nixos-version.txt";
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}
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];
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# Create the tarball
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system.build.tarball = import ../../../lib/make-system-tarball.nix {
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inherit (pkgs) stdenv perl xz pathsFromGraph;
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inherit (config.tarball) contents storeContents;
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};
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boot.postBootCommands =
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''
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# After booting, register the contents of the Nix store on the
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# CD in the Nix database in the tmpfs.
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if [ -f /nix-path-registration ]; then
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${config.nix.package}/bin/nix-store --load-db < /nix-path-registration &&
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rm /nix-path-registration
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fi
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# nixos-rebuild also requires a "system" profile and an
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# /etc/NIXOS tag.
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touch /etc/NIXOS
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${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
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'';
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};
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}
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