825 lines
29 KiB
Nix
825 lines
29 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.isoImage.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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/**
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* Given a list of `options`, concats the result of mapping each options
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* to a menuentry for use in grub.
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*
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* * defaults: {name, image, params, initrd}
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* * options: [ option... ]
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* * option: {name, params, class}
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*/
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menuBuilderGrub2 =
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defaults: options: lib.concatStrings
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(
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map
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(option: ''
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menuentry '${defaults.name} ${
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# Name appended to menuentry defaults to params if no specific name given.
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option.name or (if option ? params then "(${option.params})" else "")
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}' ${if option ? class then " --class ${option.class}" else ""} {
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linux ${defaults.image} \''${isoboot} ${defaults.params} ${
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option.params or ""
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}
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initrd ${defaults.initrd}
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}
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'')
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options
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)
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;
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/**
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* Builds the default options.
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*/
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buildMenuGrub2 = buildMenuAdditionalParamsGrub2 "";
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targetArch =
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if config.boot.loader.grub.forcei686 then
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"ia32"
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else
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pkgs.stdenv.hostPlatform.efiArch;
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/**
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* Given params to add to `params`, build a set of default options.
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* Use this one when creating a variant (e.g. hidpi)
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*/
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buildMenuAdditionalParamsGrub2 = additional:
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let
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finalCfg = {
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name = "${config.system.nixos.distroName} ${config.system.nixos.label}${config.isoImage.appendToMenuLabel}";
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params = "init=${config.system.build.toplevel}/init ${additional} ${toString config.boot.kernelParams}";
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image = "/boot/${config.system.boot.loader.kernelFile}";
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initrd = "/boot/initrd";
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};
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in
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menuBuilderGrub2
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finalCfg
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[
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{ class = "installer"; }
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{ class = "nomodeset"; params = "nomodeset"; }
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{ class = "copytoram"; params = "copytoram"; }
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{ class = "debug"; params = "debug"; }
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]
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;
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# Timeout in syslinux is in units of 1/10 of a second.
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# null means max timeout (35996, just under 1h in 1/10 seconds)
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# 0 means disable timeout
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syslinuxTimeout = if config.boot.loader.timeout == null then
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35996
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else
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config.boot.loader.timeout * 10;
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# Timeout in grub is in seconds.
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# null means max timeout (infinity)
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# 0 means disable timeout
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grubEfiTimeout = if config.boot.loader.timeout == null then
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-1
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else
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config.boot.loader.timeout;
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# The configuration file for syslinux.
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# Notes on syslinux configuration and UNetbootin compatibility:
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# * Do not use '/syslinux/syslinux.cfg' as the path for this
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# configuration. UNetbootin will not parse the file and use it as-is.
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# This results in a broken configuration if the partition label does
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# not match the specified config.isoImage.volumeID. For this reason
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# we're using '/isolinux/isolinux.cfg'.
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# * Use APPEND instead of adding command-line arguments directly after
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# the LINUX entries.
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# * COM32 entries (chainload, reboot, poweroff) are not recognized. They
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# result in incorrect boot entries.
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baseIsolinuxCfg = ''
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SERIAL 0 115200
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TIMEOUT ${builtins.toString syslinuxTimeout}
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UI vesamenu.c32
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MENU BACKGROUND /isolinux/background.png
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${config.isoImage.syslinuxTheme}
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DEFAULT boot
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LABEL boot
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MENU LABEL ${config.system.nixos.distroName} ${config.system.nixos.label}${config.isoImage.appendToMenuLabel}
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LINUX /boot/${config.system.boot.loader.kernelFile}
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APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams}
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INITRD /boot/${config.system.boot.loader.initrdFile}
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# A variant to boot with 'nomodeset'
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LABEL boot-nomodeset
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MENU LABEL ${config.system.nixos.distroName} ${config.system.nixos.label}${config.isoImage.appendToMenuLabel} (nomodeset)
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LINUX /boot/${config.system.boot.loader.kernelFile}
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APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} nomodeset
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INITRD /boot/${config.system.boot.loader.initrdFile}
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# A variant to boot with 'copytoram'
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LABEL boot-copytoram
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MENU LABEL ${config.system.nixos.distroName} ${config.system.nixos.label}${config.isoImage.appendToMenuLabel} (copytoram)
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LINUX /boot/${config.system.boot.loader.kernelFile}
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APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} copytoram
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INITRD /boot/${config.system.boot.loader.initrdFile}
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# A variant to boot with verbose logging to the console
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LABEL boot-debug
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MENU LABEL ${config.system.nixos.distroName} ${config.system.nixos.label}${config.isoImage.appendToMenuLabel} (debug)
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LINUX /boot/${config.system.boot.loader.kernelFile}
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APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} loglevel=7
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INITRD /boot/${config.system.boot.loader.initrdFile}
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# A variant to boot with a serial console enabled
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LABEL boot-serial
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MENU LABEL ${config.system.nixos.distroName} ${config.system.nixos.label}${config.isoImage.appendToMenuLabel} (serial console=ttyS0,115200n8)
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LINUX /boot/${config.system.boot.loader.kernelFile}
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APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} console=ttyS0,115200n8
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INITRD /boot/${config.system.boot.loader.initrdFile}
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'';
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isolinuxMemtest86Entry = ''
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LABEL memtest
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MENU LABEL Memtest86+
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LINUX /boot/memtest.bin
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APPEND ${toString config.boot.loader.grub.memtest86.params}
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'';
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isolinuxCfg = concatStringsSep "\n"
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([ baseIsolinuxCfg ] ++ optional config.boot.loader.grub.memtest86.enable isolinuxMemtest86Entry);
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refindBinary = if targetArch == "x64" || targetArch == "aa64" then "refind_${targetArch}.efi" else null;
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# Setup instructions for rEFInd.
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refind =
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if refindBinary != null then
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''
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# Adds rEFInd to the ISO.
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cp -v ${pkgs.refind}/share/refind/${refindBinary} $out/EFI/boot/
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''
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else
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"# No refind for ${targetArch}"
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;
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grubPkgs = if config.boot.loader.grub.forcei686 then pkgs.pkgsi686Linux else pkgs;
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grubMenuCfg = ''
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#
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# Menu configuration
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#
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# Search using a "marker file"
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search --set=root --file /EFI/nixos-installer-image
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insmod gfxterm
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insmod png
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set gfxpayload=keep
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set gfxmode=${concatStringsSep "," [
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# GRUB will use the first valid mode listed here.
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# `auto` will sometimes choose the smallest valid mode it detects.
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# So instead we'll list a lot of possibly valid modes :/
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#"3840x2160"
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#"2560x1440"
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"1920x1080"
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"1366x768"
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"1280x720"
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"1024x768"
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"800x600"
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"auto"
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]}
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# Fonts can be loaded?
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# (This font is assumed to always be provided as a fallback by NixOS)
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if loadfont (\$root)/EFI/boot/unicode.pf2; then
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set with_fonts=true
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fi
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if [ "\$textmode" != "true" -a "\$with_fonts" == "true" ]; then
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# Use graphical term, it can be either with background image or a theme.
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# input is "console", while output is "gfxterm".
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# This enables "serial" input and output only when possible.
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# Otherwise the failure mode is to not even enable gfxterm.
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if test "\$with_serial" == "yes"; then
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terminal_output gfxterm serial
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terminal_input console serial
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else
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terminal_output gfxterm
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terminal_input console
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fi
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else
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# Sets colors for the non-graphical term.
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set menu_color_normal=cyan/blue
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set menu_color_highlight=white/blue
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fi
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${ # When there is a theme configured, use it, otherwise use the background image.
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if config.isoImage.grubTheme != null then ''
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# Sets theme.
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set theme=(\$root)/EFI/boot/grub-theme/theme.txt
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# Load theme fonts
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$(find ${config.isoImage.grubTheme} -iname '*.pf2' -printf "loadfont (\$root)/EFI/boot/grub-theme/%P\n")
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'' else ''
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if background_image (\$root)/EFI/boot/efi-background.png; then
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# Black background means transparent background when there
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# is a background image set... This seems undocumented :(
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set color_normal=black/black
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set color_highlight=white/blue
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else
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# Falls back again to proper colors.
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set menu_color_normal=cyan/blue
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set menu_color_highlight=white/blue
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fi
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''}
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'';
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# The EFI boot image.
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# Notes about grub:
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# * Yes, the grubMenuCfg has to be repeated in all submenus. Otherwise you
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# will get white-on-black console-like text on sub-menus. *sigh*
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efiDir = pkgs.runCommand "efi-directory" {
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nativeBuildInputs = [ pkgs.buildPackages.grub2_efi ];
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strictDeps = true;
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} ''
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mkdir -p $out/EFI/boot/
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# Add a marker so GRUB can find the filesystem.
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touch $out/EFI/nixos-installer-image
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# ALWAYS required modules.
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MODULES="fat iso9660 part_gpt part_msdos \
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normal boot linux configfile loopback chain halt \
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efifwsetup efi_gop \
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ls search search_label search_fs_uuid search_fs_file \
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gfxmenu gfxterm gfxterm_background gfxterm_menu test all_video loadenv \
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exfat ext2 ntfs btrfs hfsplus udf \
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videoinfo png \
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echo serial \
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"
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echo "Building GRUB with modules:"
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for mod in $MODULES; do
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echo " - $mod"
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done
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# Modules that may or may not be available per-platform.
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echo "Adding additional modules:"
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for mod in efi_uga; do
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if [ -f ${grubPkgs.grub2_efi}/lib/grub/${grubPkgs.grub2_efi.grubTarget}/$mod.mod ]; then
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echo " - $mod"
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MODULES+=" $mod"
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fi
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done
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# Make our own efi program, we can't rely on "grub-install" since it seems to
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# probe for devices, even with --skip-fs-probe.
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grub-mkimage --directory=${grubPkgs.grub2_efi}/lib/grub/${grubPkgs.grub2_efi.grubTarget} -o $out/EFI/boot/boot${targetArch}.efi -p /EFI/boot -O ${grubPkgs.grub2_efi.grubTarget} \
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$MODULES
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cp ${grubPkgs.grub2_efi}/share/grub/unicode.pf2 $out/EFI/boot/
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cat <<EOF > $out/EFI/boot/grub.cfg
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set with_fonts=false
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set textmode=false
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# If you want to use serial for "terminal_*" commands, you need to set one up:
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# Example manual configuration:
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# → serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
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# This uses the defaults, and makes the serial terminal available.
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set with_serial=no
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if serial; then set with_serial=yes ;fi
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export with_serial
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clear
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set timeout=${toString grubEfiTimeout}
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# This message will only be viewable when "gfxterm" is not used.
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echo ""
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echo "Loading graphical boot menu..."
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echo ""
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echo "Press 't' to use the text boot menu on this console..."
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echo ""
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${grubMenuCfg}
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hiddenentry 'Text mode' --hotkey 't' {
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loadfont (\$root)/EFI/boot/unicode.pf2
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set textmode=true
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terminal_output gfxterm console
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}
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hiddenentry 'GUI mode' --hotkey 'g' {
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$(find ${config.isoImage.grubTheme} -iname '*.pf2' -printf "loadfont (\$root)/EFI/boot/grub-theme/%P\n")
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set textmode=false
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terminal_output gfxterm
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}
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# If the parameter iso_path is set, append the findiso parameter to the kernel
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# line. We need this to allow the nixos iso to be booted from grub directly.
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if [ \''${iso_path} ] ; then
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set isoboot="findiso=\''${iso_path}"
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fi
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#
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# Menu entries
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#
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${buildMenuGrub2}
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submenu "HiDPI, Quirks and Accessibility" --class hidpi --class submenu {
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${grubMenuCfg}
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submenu "Suggests resolution @720p" --class hidpi-720p {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "video=1280x720@60"}
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}
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submenu "Suggests resolution @1080p" --class hidpi-1080p {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "video=1920x1080@60"}
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}
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# If we boot into a graphical environment where X is autoran
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# and always crashes, it makes the media unusable. Allow the user
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# to disable this.
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submenu "Disable display-manager" --class quirk-disable-displaymanager {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "systemd.mask=display-manager.service"}
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}
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# Some laptop and convertibles have the panel installed in an
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# inconvenient way, rotated away from the keyboard.
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# Those entries makes it easier to use the installer.
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submenu "" {return}
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submenu "Rotate framebuffer Clockwise" --class rotate-90cw {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "fbcon=rotate:1"}
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}
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submenu "Rotate framebuffer Upside-Down" --class rotate-180 {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "fbcon=rotate:2"}
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}
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submenu "Rotate framebuffer Counter-Clockwise" --class rotate-90ccw {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "fbcon=rotate:3"}
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}
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# As a proof of concept, mainly. (Not sure it has accessibility merits.)
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submenu "" {return}
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submenu "Use black on white" --class accessibility-blakconwhite {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "vt.default_red=0xFF,0xBC,0x4F,0xB4,0x56,0xBC,0x4F,0x00,0xA1,0xCF,0x84,0xCA,0x8D,0xB4,0x84,0x68 vt.default_grn=0xFF,0x55,0xBA,0xBA,0x4D,0x4D,0xB3,0x00,0xA0,0x8F,0xB3,0xCA,0x88,0x93,0xA4,0x68 vt.default_blu=0xFF,0x58,0x5F,0x58,0xC5,0xBD,0xC5,0x00,0xA8,0xBB,0xAB,0x97,0xBD,0xC7,0xC5,0x68"}
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}
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# Serial access is a must!
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submenu "" {return}
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submenu "Serial console=ttyS0,115200n8" --class serial {
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${grubMenuCfg}
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${buildMenuAdditionalParamsGrub2 "console=ttyS0,115200n8"}
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}
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}
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${lib.optionalString (refindBinary != null) ''
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# GRUB apparently cannot do "chainloader" operations on "CD".
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if [ "\$root" != "cd0" ]; then
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menuentry 'rEFInd' --class refind {
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# Force root to be the FAT partition
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# Otherwise it breaks rEFInd's boot
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search --set=root --no-floppy --fs-uuid 1234-5678
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chainloader (\$root)/EFI/boot/${refindBinary}
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}
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fi
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''}
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menuentry 'Firmware Setup' --class settings {
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fwsetup
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clear
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echo ""
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echo "If you see this message, your EFI system doesn't support this feature."
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echo ""
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}
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menuentry 'Shutdown' --class shutdown {
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halt
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}
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EOF
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${refind}
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'';
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efiImg = pkgs.runCommand "efi-image_eltorito" {
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nativeBuildInputs = [ pkgs.buildPackages.mtools pkgs.buildPackages.libfaketime pkgs.buildPackages.dosfstools ];
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strictDeps = true;
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}
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# Be careful about determinism: du --apparent-size,
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# dates (cp -p, touch, mcopy -m, faketime for label), IDs (mkfs.vfat -i)
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''
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mkdir ./contents && cd ./contents
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mkdir -p ./EFI/boot
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cp -rp "${efiDir}"/EFI/boot/{grub.cfg,*.efi} ./EFI/boot
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# Rewrite dates for everything in the FS
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find . -exec touch --date=2000-01-01 {} +
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# Round up to the nearest multiple of 1MB, for more deterministic du output
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usage_size=$(( $(du -s --block-size=1M --apparent-size . | tr -cd '[:digit:]') * 1024 * 1024 ))
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# Make the image 110% as big as the files need to make up for FAT overhead
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image_size=$(( ($usage_size * 110) / 100 ))
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# Make the image fit blocks of 1M
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block_size=$((1024*1024))
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image_size=$(( ($image_size / $block_size + 1) * $block_size ))
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echo "Usage size: $usage_size"
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echo "Image size: $image_size"
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truncate --size=$image_size "$out"
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mkfs.vfat --invariant -i 12345678 -n EFIBOOT "$out"
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# Force a fixed order in mcopy for better determinism, and avoid file globbing
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for d in $(find EFI -type d | sort); do
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faketime "2000-01-01 00:00:00" mmd -i "$out" "::/$d"
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done
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for f in $(find EFI -type f | sort); do
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mcopy -pvm -i "$out" "$f" "::/$f"
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done
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# Verify the FAT partition.
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fsck.vfat -vn "$out"
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''; # */
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# Syslinux (and isolinux) only supports x86-based architectures.
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canx86BiosBoot = pkgs.stdenv.hostPlatform.isx86;
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in
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{
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options = {
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isoImage.isoName = mkOption {
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default = "${config.isoImage.isoBaseName}.iso";
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description = lib.mdDoc ''
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Name of the generated ISO image file.
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'';
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};
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isoImage.isoBaseName = mkOption {
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default = config.system.nixos.distroId;
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description = lib.mdDoc ''
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Prefix of the name of the generated ISO image file.
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'';
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};
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isoImage.compressImage = mkOption {
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default = false;
|
||
description = lib.mdDoc ''
|
||
Whether the ISO image should be compressed using
|
||
{command}`zstd`.
|
||
'';
|
||
};
|
||
|
||
isoImage.squashfsCompression = mkOption {
|
||
default = with pkgs.stdenv.targetPlatform; "xz -Xdict-size 100% "
|
||
+ lib.optionalString isx86 "-Xbcj x86"
|
||
# Untested but should also reduce size for these platforms
|
||
+ lib.optionalString isAarch "-Xbcj arm"
|
||
+ lib.optionalString (isPower && is32bit && isBigEndian) "-Xbcj powerpc"
|
||
+ lib.optionalString (isSparc) "-Xbcj sparc";
|
||
description = lib.mdDoc ''
|
||
Compression settings to use for the squashfs nix store.
|
||
'';
|
||
example = "zstd -Xcompression-level 6";
|
||
};
|
||
|
||
isoImage.edition = mkOption {
|
||
default = "";
|
||
description = lib.mdDoc ''
|
||
Specifies which edition string to use in the volume ID of the generated
|
||
ISO image.
|
||
'';
|
||
};
|
||
|
||
isoImage.volumeID = mkOption {
|
||
# nixos-$EDITION-$RELEASE-$ARCH
|
||
default = "nixos${optionalString (config.isoImage.edition != "") "-${config.isoImage.edition}"}-${config.system.nixos.release}-${pkgs.stdenv.hostPlatform.uname.processor}";
|
||
description = lib.mdDoc ''
|
||
Specifies the label or volume ID of the generated ISO image.
|
||
Note that the label is used by stage 1 of the boot process to
|
||
mount the CD, so it should be reasonably distinctive.
|
||
'';
|
||
};
|
||
|
||
isoImage.contents = mkOption {
|
||
example = literalExpression ''
|
||
[ { source = pkgs.memtest86 + "/memtest.bin";
|
||
target = "boot/memtest.bin";
|
||
}
|
||
]
|
||
'';
|
||
description = lib.mdDoc ''
|
||
This option lists files to be copied to fixed locations in the
|
||
generated ISO image.
|
||
'';
|
||
};
|
||
|
||
isoImage.storeContents = mkOption {
|
||
example = literalExpression "[ pkgs.stdenv ]";
|
||
description = lib.mdDoc ''
|
||
This option lists additional derivations to be included in the
|
||
Nix store in the generated ISO image.
|
||
'';
|
||
};
|
||
|
||
isoImage.includeSystemBuildDependencies = mkOption {
|
||
default = false;
|
||
description = lib.mdDoc ''
|
||
Set this option to include all the needed sources etc in the
|
||
image. It significantly increases image size. Use that when
|
||
you want to be able to keep all the sources needed to build your
|
||
system or when you are going to install the system on a computer
|
||
with slow or non-existent network connection.
|
||
'';
|
||
};
|
||
|
||
isoImage.makeBiosBootable = mkOption {
|
||
default = false;
|
||
description = lib.mdDoc ''
|
||
Whether the ISO image should be a BIOS-bootable disk.
|
||
'';
|
||
};
|
||
|
||
isoImage.makeEfiBootable = mkOption {
|
||
default = false;
|
||
description = lib.mdDoc ''
|
||
Whether the ISO image should be an EFI-bootable volume.
|
||
'';
|
||
};
|
||
|
||
isoImage.makeUsbBootable = mkOption {
|
||
default = false;
|
||
description = lib.mdDoc ''
|
||
Whether the ISO image should be bootable from CD as well as USB.
|
||
'';
|
||
};
|
||
|
||
isoImage.efiSplashImage = mkOption {
|
||
default = pkgs.fetchurl {
|
||
url = "https://raw.githubusercontent.com/NixOS/nixos-artwork/a9e05d7deb38a8e005a2b52575a3f59a63a4dba0/bootloader/efi-background.png";
|
||
sha256 = "18lfwmp8yq923322nlb9gxrh5qikj1wsk6g5qvdh31c4h5b1538x";
|
||
};
|
||
description = lib.mdDoc ''
|
||
The splash image to use in the EFI bootloader.
|
||
'';
|
||
};
|
||
|
||
isoImage.splashImage = mkOption {
|
||
default = pkgs.fetchurl {
|
||
url = "https://raw.githubusercontent.com/NixOS/nixos-artwork/a9e05d7deb38a8e005a2b52575a3f59a63a4dba0/bootloader/isolinux/bios-boot.png";
|
||
sha256 = "1wp822zrhbg4fgfbwkr7cbkr4labx477209agzc0hr6k62fr6rxd";
|
||
};
|
||
description = lib.mdDoc ''
|
||
The splash image to use in the legacy-boot bootloader.
|
||
'';
|
||
};
|
||
|
||
isoImage.grubTheme = mkOption {
|
||
default = pkgs.nixos-grub2-theme;
|
||
type = types.nullOr (types.either types.path types.package);
|
||
description = lib.mdDoc ''
|
||
The grub2 theme used for UEFI boot.
|
||
'';
|
||
};
|
||
|
||
isoImage.syslinuxTheme = mkOption {
|
||
default = ''
|
||
MENU TITLE ${config.system.nixos.distroName}
|
||
MENU RESOLUTION 800 600
|
||
MENU CLEAR
|
||
MENU ROWS 6
|
||
MENU CMDLINEROW -4
|
||
MENU TIMEOUTROW -3
|
||
MENU TABMSGROW -2
|
||
MENU HELPMSGROW -1
|
||
MENU HELPMSGENDROW -1
|
||
MENU MARGIN 0
|
||
|
||
# FG:AARRGGBB BG:AARRGGBB shadow
|
||
MENU COLOR BORDER 30;44 #00000000 #00000000 none
|
||
MENU COLOR SCREEN 37;40 #FF000000 #00E2E8FF none
|
||
MENU COLOR TABMSG 31;40 #80000000 #00000000 none
|
||
MENU COLOR TIMEOUT 1;37;40 #FF000000 #00000000 none
|
||
MENU COLOR TIMEOUT_MSG 37;40 #FF000000 #00000000 none
|
||
MENU COLOR CMDMARK 1;36;40 #FF000000 #00000000 none
|
||
MENU COLOR CMDLINE 37;40 #FF000000 #00000000 none
|
||
MENU COLOR TITLE 1;36;44 #00000000 #00000000 none
|
||
MENU COLOR UNSEL 37;44 #FF000000 #00000000 none
|
||
MENU COLOR SEL 7;37;40 #FFFFFFFF #FF5277C3 std
|
||
'';
|
||
type = types.str;
|
||
description = lib.mdDoc ''
|
||
The syslinux theme used for BIOS boot.
|
||
'';
|
||
};
|
||
|
||
isoImage.appendToMenuLabel = mkOption {
|
||
default = " Installer";
|
||
example = " Live System";
|
||
description = lib.mdDoc ''
|
||
The string to append after the menu label for the NixOS system.
|
||
This will be directly appended (without whitespace) to the NixOS version
|
||
string, like for example if it is set to `XXX`:
|
||
|
||
`NixOS 99.99-pre666XXX`
|
||
'';
|
||
};
|
||
|
||
};
|
||
|
||
# store them in lib so we can mkImageMediaOverride the
|
||
# entire file system layout in installation media (only)
|
||
config.lib.isoFileSystems = {
|
||
"/" = mkImageMediaOverride
|
||
{
|
||
fsType = "tmpfs";
|
||
options = [ "mode=0755" ];
|
||
};
|
||
|
||
# Note that /dev/root is a symlink to the actual root device
|
||
# specified on the kernel command line, created in the stage 1
|
||
# init script.
|
||
"/iso" = mkImageMediaOverride
|
||
{ device = "/dev/root";
|
||
neededForBoot = true;
|
||
noCheck = true;
|
||
};
|
||
|
||
# In stage 1, mount a tmpfs on top of /nix/store (the squashfs
|
||
# image) to make this a live CD.
|
||
"/nix/.ro-store" = mkImageMediaOverride
|
||
{ fsType = "squashfs";
|
||
device = "/iso/nix-store.squashfs";
|
||
options = [ "loop" ];
|
||
neededForBoot = true;
|
||
};
|
||
|
||
"/nix/.rw-store" = mkImageMediaOverride
|
||
{ fsType = "tmpfs";
|
||
options = [ "mode=0755" ];
|
||
neededForBoot = true;
|
||
};
|
||
|
||
"/nix/store" = mkImageMediaOverride
|
||
{ fsType = "overlay";
|
||
device = "overlay";
|
||
options = [
|
||
"lowerdir=/nix/.ro-store"
|
||
"upperdir=/nix/.rw-store/store"
|
||
"workdir=/nix/.rw-store/work"
|
||
];
|
||
depends = [
|
||
"/nix/.ro-store"
|
||
"/nix/.rw-store/store"
|
||
"/nix/.rw-store/work"
|
||
];
|
||
};
|
||
};
|
||
|
||
config = {
|
||
assertions = [
|
||
{
|
||
assertion = !(stringLength config.isoImage.volumeID > 32);
|
||
# https://wiki.osdev.org/ISO_9660#The_Primary_Volume_Descriptor
|
||
# Volume Identifier can only be 32 bytes
|
||
message = let
|
||
length = stringLength config.isoImage.volumeID;
|
||
howmany = toString length;
|
||
toomany = toString (length - 32);
|
||
in
|
||
"isoImage.volumeID ${config.isoImage.volumeID} is ${howmany} characters. That is ${toomany} characters longer than the limit of 32.";
|
||
}
|
||
];
|
||
|
||
boot.loader.grub.version = 2;
|
||
|
||
# Don't build the GRUB menu builder script, since we don't need it
|
||
# here and it causes a cyclic dependency.
|
||
boot.loader.grub.enable = false;
|
||
|
||
environment.systemPackages = [ grubPkgs.grub2 grubPkgs.grub2_efi ]
|
||
++ optional (config.isoImage.makeBiosBootable && canx86BiosBoot) pkgs.syslinux
|
||
;
|
||
|
||
# In stage 1 of the boot, mount the CD as the root FS by label so
|
||
# that we don't need to know its device. We pass the label of the
|
||
# root filesystem on the kernel command line, rather than in
|
||
# `fileSystems' below. This allows CD-to-USB converters such as
|
||
# UNetbootin to rewrite the kernel command line to pass the label or
|
||
# UUID of the USB stick. It would be nicer to write
|
||
# `root=/dev/disk/by-label/...' here, but UNetbootin doesn't
|
||
# recognise that.
|
||
boot.kernelParams =
|
||
[ "root=LABEL=${config.isoImage.volumeID}"
|
||
"boot.shell_on_fail"
|
||
];
|
||
|
||
fileSystems = config.lib.isoFileSystems;
|
||
|
||
boot.initrd.availableKernelModules = [ "squashfs" "iso9660" "uas" "overlay" ];
|
||
|
||
boot.initrd.kernelModules = [ "loop" "overlay" ];
|
||
|
||
# Closures to be copied to the Nix store on the CD, namely the init
|
||
# script and the top-level system configuration directory.
|
||
isoImage.storeContents =
|
||
[ config.system.build.toplevel ] ++
|
||
optional config.isoImage.includeSystemBuildDependencies
|
||
config.system.build.toplevel.drvPath;
|
||
|
||
# Create the squashfs image that contains the Nix store.
|
||
system.build.squashfsStore = pkgs.callPackage ../../../lib/make-squashfs.nix {
|
||
storeContents = config.isoImage.storeContents;
|
||
comp = config.isoImage.squashfsCompression;
|
||
};
|
||
|
||
# Individual files to be included on the CD, outside of the Nix
|
||
# store on the CD.
|
||
isoImage.contents =
|
||
[
|
||
{ source = config.boot.kernelPackages.kernel + "/" + config.system.boot.loader.kernelFile;
|
||
target = "/boot/" + config.system.boot.loader.kernelFile;
|
||
}
|
||
{ source = config.system.build.initialRamdisk + "/" + config.system.boot.loader.initrdFile;
|
||
target = "/boot/" + config.system.boot.loader.initrdFile;
|
||
}
|
||
{ source = config.system.build.squashfsStore;
|
||
target = "/nix-store.squashfs";
|
||
}
|
||
{ source = pkgs.writeText "version" config.system.nixos.label;
|
||
target = "/version.txt";
|
||
}
|
||
] ++ optionals (config.isoImage.makeBiosBootable && canx86BiosBoot) [
|
||
{ source = config.isoImage.splashImage;
|
||
target = "/isolinux/background.png";
|
||
}
|
||
{ source = pkgs.substituteAll {
|
||
name = "isolinux.cfg";
|
||
src = pkgs.writeText "isolinux.cfg-in" isolinuxCfg;
|
||
bootRoot = "/boot";
|
||
};
|
||
target = "/isolinux/isolinux.cfg";
|
||
}
|
||
{ source = "${pkgs.syslinux}/share/syslinux";
|
||
target = "/isolinux";
|
||
}
|
||
] ++ optionals config.isoImage.makeEfiBootable [
|
||
{ source = efiImg;
|
||
target = "/boot/efi.img";
|
||
}
|
||
{ source = "${efiDir}/EFI";
|
||
target = "/EFI";
|
||
}
|
||
{ source = (pkgs.writeTextDir "grub/loopback.cfg" "source /EFI/boot/grub.cfg") + "/grub";
|
||
target = "/boot/grub";
|
||
}
|
||
{ source = config.isoImage.efiSplashImage;
|
||
target = "/EFI/boot/efi-background.png";
|
||
}
|
||
] ++ optionals (config.boot.loader.grub.memtest86.enable && config.isoImage.makeBiosBootable && canx86BiosBoot) [
|
||
{ source = "${pkgs.memtest86plus}/memtest.bin";
|
||
target = "/boot/memtest.bin";
|
||
}
|
||
] ++ optionals (config.isoImage.grubTheme != null) [
|
||
{ source = config.isoImage.grubTheme;
|
||
target = "/EFI/boot/grub-theme";
|
||
}
|
||
];
|
||
|
||
boot.loader.timeout = 10;
|
||
|
||
# Create the ISO image.
|
||
system.build.isoImage = pkgs.callPackage ../../../lib/make-iso9660-image.nix ({
|
||
inherit (config.isoImage) isoName compressImage volumeID contents;
|
||
bootable = config.isoImage.makeBiosBootable && canx86BiosBoot;
|
||
bootImage = "/isolinux/isolinux.bin";
|
||
syslinux = if config.isoImage.makeBiosBootable && canx86BiosBoot then pkgs.syslinux else null;
|
||
} // optionalAttrs (config.isoImage.makeUsbBootable && config.isoImage.makeBiosBootable && canx86BiosBoot) {
|
||
usbBootable = true;
|
||
isohybridMbrImage = "${pkgs.syslinux}/share/syslinux/isohdpfx.bin";
|
||
} // optionalAttrs config.isoImage.makeEfiBootable {
|
||
efiBootable = true;
|
||
efiBootImage = "boot/efi.img";
|
||
});
|
||
|
||
boot.postBootCommands =
|
||
''
|
||
# After booting, register the contents of the Nix store on the
|
||
# CD in the Nix database in the tmpfs.
|
||
${config.nix.package.out}/bin/nix-store --load-db < /nix/store/nix-path-registration
|
||
|
||
# nixos-rebuild also requires a "system" profile and an
|
||
# /etc/NIXOS tag.
|
||
touch /etc/NIXOS
|
||
${config.nix.package.out}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
|
||
'';
|
||
|
||
# Add vfat support to the initrd to enable people to copy the
|
||
# contents of the CD to a bootable USB stick.
|
||
boot.initrd.supportedFilesystems = [ "vfat" ];
|
||
|
||
};
|
||
|
||
}
|