72 lines
2.3 KiB
Nix
72 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. We put them in a tarball because accessing that many small
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# files from a slow device like a CD-ROM takes too long. !!! Once
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# we use squashfs, maybe we won't need this anymore.
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makeTarball = tarName: input: pkgs.runCommand "tarball" {inherit tarName;}
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''
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ensureDir $out
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(cd ${input} && tar cvfj $out/${tarName} . \
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--exclude '*~' --exclude 'result')
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'';
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# Put the current directory in a tarball.
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nixosTarball = makeTarball "nixos.tar.bz2" (cleanSource ../../..);
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# Put Nixpkgs in a tarball.
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nixpkgsTarball = makeTarball "nixpkgs.tar.bz2" (cleanSource pkgs.path);
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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/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}-${pkgs.stdenv.system}.iso";
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isoImage.volumeID = "NIXOS_INSTALL_CD_${config.system.nixosVersion}";
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boot.postBootCommands =
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''
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export PATH=${pkgs.gnutar}/bin:${pkgs.bzip2}/bin:$PATH
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# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
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# for nixos-install.
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${optionalString includeSources ''
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echo "unpacking the NixOS/Nixpkgs sources..."
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mkdir -p /etc/nixos/nixos
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tar xjf ${nixosTarball}/nixos.tar.bz2 -C /etc/nixos/nixos
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mkdir -p /etc/nixos/nixpkgs
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tar xjf ${nixpkgsTarball}/nixpkgs.tar.bz2 -C /etc/nixos/nixpkgs
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chown -R root.root /etc/nixos
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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.klibc pkgs.klibcShrunk ];
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}
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