68 lines
2.3 KiB
Nix
68 lines
2.3 KiB
Nix
# This module contains the basic configuration for building a NixOS
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# installation CD.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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# We need a copy of the Nix expressions for Nixpkgs and NixOS on the
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# CD. These are installed into the "nixos" channel of the root
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# user, as expected by nixos-rebuild/nixos-install.
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channelSources = pkgs.runCommand "nixos-${config.system.nixosVersion}"
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{ expr = builtins.readFile ../../../lib/channel-expr.nix; }
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''
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mkdir -p $out/nixos
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cp -prd ${cleanSource ../../..} $out/nixos/nixos
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cp -prd ${cleanSource <nixpkgs>} $out/nixos/nixpkgs
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chmod -R u+w $out/nixos/nixos
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echo -n ${config.system.nixosVersion} > $out/nixos/nixos/.version
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echo -n "" > $out/nixos/nixos/.version-suffix
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echo "$expr" > $out/nixos/default.nix
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'';
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includeSources = true;
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in
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{
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require =
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[ ./memtest.nix
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./iso-image.nix
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# Profiles of this basic installation CD.
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../../profiles/all-hardware.nix
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../../profiles/base.nix
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../../profiles/installation-device.nix
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];
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# ISO naming.
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isoImage.isoName = "${config.isoImage.isoBaseName}-${config.system.nixosVersion}-${pkgs.stdenv.system}.iso";
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isoImage.volumeID = "NIXOS_${config.system.nixosVersion}";
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boot.postBootCommands =
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''
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# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
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# for nixos-install.
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${optionalString includeSources ''
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echo "unpacking the NixOS/Nixpkgs sources..."
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mkdir -p /nix/var/nix/profiles/per-user/root
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${config.environment.nix}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels -i ${channelSources} --quiet
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mkdir -m 0700 -p /root/.nix-defexpr
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ln -s /nix/var/nix/profiles/per-user/root/channels /root/.nix-defexpr/channels
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''}
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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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echo 1 > /proc/sys/vm/overcommit_memory
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'';
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# To speed up installation a little bit, include the complete stdenv
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# in the Nix store on the CD.
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isoImage.storeContents = [ pkgs.stdenv pkgs.busybox ];
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}
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