716 lines
25 KiB
Nix
716 lines
25 KiB
Nix
# This module creates a bootable ISO image containing the given NixOS
|
||
# configuration. The derivation for the ISO image will be placed in
|
||
# config.system.build.isoImage.
|
||
|
||
{ config, lib, pkgs, ... }:
|
||
|
||
with lib;
|
||
|
||
let
|
||
/**
|
||
* Given a list of `options`, concats the result of mapping each options
|
||
* to a menuentry for use in grub.
|
||
*
|
||
* * defaults: {name, image, params, initrd}
|
||
* * options: [ option... ]
|
||
* * option: {name, params, class}
|
||
*/
|
||
menuBuilderGrub2 =
|
||
defaults: options: lib.concatStrings
|
||
(
|
||
map
|
||
(option: ''
|
||
menuentry '${defaults.name} ${
|
||
# Name appended to menuentry defaults to params if no specific name given.
|
||
option.name or (if option ? params then "(${option.params})" else "")
|
||
}' ${if option ? class then " --class ${option.class}" else ""} {
|
||
linux ${defaults.image} \''${isoboot} ${defaults.params} ${
|
||
option.params or ""
|
||
}
|
||
initrd ${defaults.initrd}
|
||
}
|
||
'')
|
||
options
|
||
)
|
||
;
|
||
|
||
/**
|
||
* Given a `config`, builds the default options.
|
||
*/
|
||
buildMenuGrub2 = config:
|
||
buildMenuAdditionalParamsGrub2 config ""
|
||
;
|
||
|
||
/**
|
||
* Given a `config` and params to add to `params`, build a set of default options.
|
||
* Use this one when creating a variant (e.g. hidpi)
|
||
*/
|
||
buildMenuAdditionalParamsGrub2 = config: additional:
|
||
let
|
||
finalCfg = {
|
||
name = "NixOS ${config.system.nixos.label}${config.isoImage.appendToMenuLabel}";
|
||
params = "init=${config.system.build.toplevel}/init ${additional} ${toString config.boot.kernelParams}";
|
||
image = "/boot/${config.system.boot.loader.kernelFile}";
|
||
initrd = "/boot/initrd";
|
||
};
|
||
in
|
||
menuBuilderGrub2
|
||
finalCfg
|
||
[
|
||
{ class = "installer"; }
|
||
{ class = "nomodeset"; params = "nomodeset"; }
|
||
{ class = "copytoram"; params = "copytoram"; }
|
||
{ class = "debug"; params = "debug"; }
|
||
]
|
||
;
|
||
|
||
# Timeout in syslinux is in units of 1/10 of a second.
|
||
# 0 is used to disable timeouts.
|
||
syslinuxTimeout = if config.boot.loader.timeout == null then
|
||
0
|
||
else
|
||
max (config.boot.loader.timeout * 10) 1;
|
||
|
||
|
||
max = x: y: if x > y then x else y;
|
||
|
||
# The configuration file for syslinux.
|
||
|
||
# Notes on syslinux configuration and UNetbootin compatiblity:
|
||
# * Do not use '/syslinux/syslinux.cfg' as the path for this
|
||
# configuration. UNetbootin will not parse the file and use it as-is.
|
||
# This results in a broken configuration if the partition label does
|
||
# not match the specified config.isoImage.volumeID. For this reason
|
||
# we're using '/isolinux/isolinux.cfg'.
|
||
# * Use APPEND instead of adding command-line arguments directly after
|
||
# the LINUX entries.
|
||
# * COM32 entries (chainload, reboot, poweroff) are not recognized. They
|
||
# result in incorrect boot entries.
|
||
|
||
baseIsolinuxCfg = ''
|
||
SERIAL 0 115200
|
||
TIMEOUT ${builtins.toString syslinuxTimeout}
|
||
UI vesamenu.c32
|
||
MENU TITLE NixOS
|
||
MENU BACKGROUND /isolinux/background.png
|
||
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
|
||
|
||
DEFAULT boot
|
||
|
||
LABEL boot
|
||
MENU LABEL NixOS ${config.system.nixos.label}${config.isoImage.appendToMenuLabel}
|
||
LINUX /boot/${config.system.boot.loader.kernelFile}
|
||
APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams}
|
||
INITRD /boot/${config.system.boot.loader.initrdFile}
|
||
|
||
# A variant to boot with 'nomodeset'
|
||
LABEL boot-nomodeset
|
||
MENU LABEL NixOS ${config.system.nixos.label}${config.isoImage.appendToMenuLabel} (nomodeset)
|
||
LINUX /boot/${config.system.boot.loader.kernelFile}
|
||
APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} nomodeset
|
||
INITRD /boot/${config.system.boot.loader.initrdFile}
|
||
|
||
# A variant to boot with 'copytoram'
|
||
LABEL boot-copytoram
|
||
MENU LABEL NixOS ${config.system.nixos.label}${config.isoImage.appendToMenuLabel} (copytoram)
|
||
LINUX /boot/${config.system.boot.loader.kernelFile}
|
||
APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} copytoram
|
||
INITRD /boot/${config.system.boot.loader.initrdFile}
|
||
|
||
# A variant to boot with verbose logging to the console
|
||
LABEL boot-debug
|
||
MENU LABEL NixOS ${config.system.nixos.label}${config.isoImage.appendToMenuLabel} (debug)
|
||
LINUX /boot/${config.system.boot.loader.kernelFile}
|
||
APPEND init=${config.system.build.toplevel}/init ${toString config.boot.kernelParams} loglevel=7
|
||
INITRD /boot/${config.system.boot.loader.initrdFile}
|
||
'';
|
||
|
||
isolinuxMemtest86Entry = ''
|
||
LABEL memtest
|
||
MENU LABEL Memtest86+
|
||
LINUX /boot/memtest.bin
|
||
APPEND ${toString config.boot.loader.grub.memtest86.params}
|
||
'';
|
||
|
||
isolinuxCfg = concatStringsSep "\n"
|
||
([ baseIsolinuxCfg ] ++ optional config.boot.loader.grub.memtest86.enable isolinuxMemtest86Entry);
|
||
|
||
# Setup instructions for rEFInd.
|
||
refind =
|
||
if targetArch == "x64" then
|
||
''
|
||
# Adds rEFInd to the ISO.
|
||
cp -v ${pkgs.refind}/share/refind/refind_x64.efi $out/EFI/boot/
|
||
''
|
||
else
|
||
"# No refind for ${targetArch}"
|
||
;
|
||
|
||
grubPkgs = if config.boot.loader.grub.forcei686 then pkgs.pkgsi686Linux else pkgs;
|
||
|
||
grubMenuCfg = ''
|
||
#
|
||
# Menu configuration
|
||
#
|
||
|
||
insmod gfxterm
|
||
insmod png
|
||
set gfxpayload=keep
|
||
|
||
# Fonts can be loaded?
|
||
# (This font is assumed to always be provided as a fallback by NixOS)
|
||
if loadfont (hd0)/EFI/boot/unicode.pf2; then
|
||
# Use graphical term, it can be either with background image or a theme.
|
||
# input is "console", while output is "gfxterm".
|
||
# This enables "serial" input and output only when possible.
|
||
# Otherwise the failure mode is to not even enable gfxterm.
|
||
if test "\$with_serial" == "yes"; then
|
||
terminal_output gfxterm serial
|
||
terminal_input console serial
|
||
else
|
||
terminal_output gfxterm
|
||
terminal_input console
|
||
fi
|
||
else
|
||
# Sets colors for the non-graphical term.
|
||
set menu_color_normal=cyan/blue
|
||
set menu_color_highlight=white/blue
|
||
fi
|
||
|
||
${ # When there is a theme configured, use it, otherwise use the background image.
|
||
if config.isoImage.grubTheme != null then ''
|
||
# Sets theme.
|
||
set theme=(hd0)/EFI/boot/grub-theme/theme.txt
|
||
# Load theme fonts
|
||
$(find ${config.isoImage.grubTheme} -iname '*.pf2' -printf "loadfont (hd0)/EFI/boot/grub-theme/%P\n")
|
||
'' else ''
|
||
if background_image (hd0)/EFI/boot/efi-background.png; then
|
||
# Black background means transparent background when there
|
||
# is a background image set... This seems undocumented :(
|
||
set color_normal=black/black
|
||
set color_highlight=white/blue
|
||
else
|
||
# Falls back again to proper colors.
|
||
set menu_color_normal=cyan/blue
|
||
set menu_color_highlight=white/blue
|
||
fi
|
||
''}
|
||
'';
|
||
|
||
# The EFI boot image.
|
||
# Notes about grub:
|
||
# * Yes, the grubMenuCfg has to be repeated in all submenus. Otherwise you
|
||
# will get white-on-black console-like text on sub-menus. *sigh*
|
||
efiDir = pkgs.runCommand "efi-directory" {} ''
|
||
mkdir -p $out/EFI/boot/
|
||
|
||
# ALWAYS required modules.
|
||
MODULES="fat iso9660 part_gpt part_msdos \
|
||
normal boot linux configfile loopback chain halt \
|
||
efifwsetup efi_gop \
|
||
ls search search_label search_fs_uuid search_fs_file \
|
||
gfxmenu gfxterm gfxterm_background gfxterm_menu test all_video loadenv \
|
||
exfat ext2 ntfs btrfs hfsplus udf \
|
||
videoinfo png \
|
||
echo serial \
|
||
"
|
||
|
||
echo "Building GRUB with modules:"
|
||
for mod in $MODULES; do
|
||
echo " - $mod"
|
||
done
|
||
|
||
# Modules that may or may not be available per-platform.
|
||
echo "Adding additional modules:"
|
||
for mod in efi_uga; do
|
||
if [ -f ${grubPkgs.grub2_efi}/lib/grub/${grubPkgs.grub2_efi.grubTarget}/$mod.mod ]; then
|
||
echo " - $mod"
|
||
MODULES+=" $mod"
|
||
fi
|
||
done
|
||
|
||
# Make our own efi program, we can't rely on "grub-install" since it seems to
|
||
# probe for devices, even with --skip-fs-probe.
|
||
${grubPkgs.grub2_efi}/bin/grub-mkimage -o $out/EFI/boot/boot${targetArch}.efi -p /EFI/boot -O ${grubPkgs.grub2_efi.grubTarget} \
|
||
$MODULES
|
||
cp ${grubPkgs.grub2_efi}/share/grub/unicode.pf2 $out/EFI/boot/
|
||
|
||
cat <<EOF > $out/EFI/boot/grub.cfg
|
||
|
||
# If you want to use serial for "terminal_*" commands, you need to set one up:
|
||
# Example manual configuration:
|
||
# → serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
|
||
# This uses the defaults, and makes the serial terminal available.
|
||
set with_serial=no
|
||
if serial; then set with_serial=yes ;fi
|
||
export with_serial
|
||
clear
|
||
set timeout=10
|
||
${grubMenuCfg}
|
||
|
||
# If the parameter iso_path is set, append the findiso parameter to the kernel
|
||
# line. We need this to allow the nixos iso to be booted from grub directly.
|
||
if [ \''${iso_path} ] ; then
|
||
set isoboot="findiso=\''${iso_path}"
|
||
fi
|
||
|
||
#
|
||
# Menu entries
|
||
#
|
||
|
||
${buildMenuGrub2 config}
|
||
submenu "HiDPI, Quirks and Accessibility" --class hidpi --class submenu {
|
||
${grubMenuCfg}
|
||
submenu "Suggests resolution @720p" --class hidpi-720p {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "video=1280x720@60"}
|
||
}
|
||
submenu "Suggests resolution @1080p" --class hidpi-1080p {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "video=1920x1080@60"}
|
||
}
|
||
|
||
# If we boot into a graphical environment where X is autoran
|
||
# and always crashes, it makes the media unusable. Allow the user
|
||
# to disable this.
|
||
submenu "Disable display-manager" --class quirk-disable-displaymanager {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "systemd.mask=display-manager.service"}
|
||
}
|
||
|
||
# Some laptop and convertibles have the panel installed in an
|
||
# inconvenient way, rotated away from the keyboard.
|
||
# Those entries makes it easier to use the installer.
|
||
submenu "" {return}
|
||
submenu "Rotate framebuffer Clockwise" --class rotate-90cw {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "fbcon=rotate:1"}
|
||
}
|
||
submenu "Rotate framebuffer Upside-Down" --class rotate-180 {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "fbcon=rotate:2"}
|
||
}
|
||
submenu "Rotate framebuffer Counter-Clockwise" --class rotate-90ccw {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "fbcon=rotate:3"}
|
||
}
|
||
|
||
# As a proof of concept, mainly. (Not sure it has accessibility merits.)
|
||
submenu "" {return}
|
||
submenu "Use black on white" --class accessibility-blakconwhite {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "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"}
|
||
}
|
||
|
||
# Serial access is a must!
|
||
submenu "" {return}
|
||
submenu "Serial console=ttyS0,115200n8" --class serial {
|
||
${grubMenuCfg}
|
||
${buildMenuAdditionalParamsGrub2 config "console=ttyS0,115200n8"}
|
||
}
|
||
}
|
||
|
||
menuentry 'rEFInd' --class refind {
|
||
# UUID is hard-coded in the derivation.
|
||
search --set=root --no-floppy --fs-uuid 1234-5678
|
||
chainloader (\$root)/EFI/boot/refind_x64.efi
|
||
}
|
||
menuentry 'Firmware Setup' --class settings {
|
||
fwsetup
|
||
clear
|
||
echo ""
|
||
echo "If you see this message, your EFI system doesn't support this feature."
|
||
echo ""
|
||
}
|
||
menuentry 'Shutdown' --class shutdown {
|
||
halt
|
||
}
|
||
EOF
|
||
|
||
${refind}
|
||
'';
|
||
|
||
efiImg = pkgs.runCommand "efi-image_eltorito" { buildInputs = [ pkgs.mtools pkgs.libfaketime ]; }
|
||
# Be careful about determinism: du --apparent-size,
|
||
# dates (cp -p, touch, mcopy -m, faketime for label), IDs (mkfs.vfat -i)
|
||
''
|
||
mkdir ./contents && cd ./contents
|
||
cp -rp "${efiDir}"/EFI .
|
||
mkdir ./boot
|
||
cp -p "${config.boot.kernelPackages.kernel}/${config.system.boot.loader.kernelFile}" \
|
||
"${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}" ./boot/
|
||
touch --date=@0 ./EFI ./boot
|
||
|
||
usage_size=$(du -sb --apparent-size . | tr -cd '[:digit:]')
|
||
# Make the image 110% as big as the files need to make up for FAT overhead
|
||
image_size=$(( ($usage_size * 110) / 100 ))
|
||
# Make the image fit blocks of 1M
|
||
block_size=$((1024*1024))
|
||
image_size=$(( ($image_size / $block_size + 1) * $block_size ))
|
||
echo "Usage size: $usage_size"
|
||
echo "Image size: $image_size"
|
||
truncate --size=$image_size "$out"
|
||
${pkgs.libfaketime}/bin/faketime "2000-01-01 00:00:00" ${pkgs.dosfstools}/sbin/mkfs.vfat -i 12345678 -n EFIBOOT "$out"
|
||
mcopy -psvm -i "$out" ./EFI ./boot ::
|
||
# Verify the FAT partition.
|
||
${pkgs.dosfstools}/sbin/fsck.vfat -vn "$out"
|
||
''; # */
|
||
|
||
# Name used by UEFI for architectures.
|
||
targetArch =
|
||
if pkgs.stdenv.isi686 || config.boot.loader.grub.forcei686 then
|
||
"ia32"
|
||
else if pkgs.stdenv.isx86_64 then
|
||
"x64"
|
||
else if pkgs.stdenv.isAarch64 then
|
||
"aa64"
|
||
else
|
||
throw "Unsupported architecture";
|
||
|
||
# Syslinux (and isolinux) only supports x86-based architectures.
|
||
canx86BiosBoot = pkgs.stdenv.isi686 || pkgs.stdenv.isx86_64;
|
||
|
||
in
|
||
|
||
{
|
||
options = {
|
||
|
||
isoImage.isoName = mkOption {
|
||
default = "${config.isoImage.isoBaseName}.iso";
|
||
description = ''
|
||
Name of the generated ISO image file.
|
||
'';
|
||
};
|
||
|
||
isoImage.isoBaseName = mkOption {
|
||
default = "nixos";
|
||
description = ''
|
||
Prefix of the name of the generated ISO image file.
|
||
'';
|
||
};
|
||
|
||
isoImage.compressImage = mkOption {
|
||
default = false;
|
||
description = ''
|
||
Whether the ISO image should be compressed using
|
||
<command>zstd</command>.
|
||
'';
|
||
};
|
||
|
||
isoImage.squashfsCompression = mkOption {
|
||
default = "xz -Xdict-size 100%";
|
||
description = ''
|
||
Compression settings to use for the squashfs nix store.
|
||
'';
|
||
example = "zstd -Xcompression-level 6";
|
||
};
|
||
|
||
isoImage.edition = mkOption {
|
||
default = "";
|
||
description = ''
|
||
Specifies which edition string to use in the volume ID of the generated
|
||
ISO image.
|
||
'';
|
||
};
|
||
|
||
isoImage.volumeID = mkOption {
|
||
# nixos-$EDITION-$RELEASE-$ARCH
|
||
default = "nixos${optionalString (config.isoImage.edition != "") "-${config.isoImage.edition}"}-${config.system.nixos.release}-${pkgs.stdenv.hostPlatform.uname.processor}";
|
||
description = ''
|
||
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 = literalExample ''
|
||
[ { source = pkgs.memtest86 + "/memtest.bin";
|
||
target = "boot/memtest.bin";
|
||
}
|
||
]
|
||
'';
|
||
description = ''
|
||
This option lists files to be copied to fixed locations in the
|
||
generated ISO image.
|
||
'';
|
||
};
|
||
|
||
isoImage.storeContents = mkOption {
|
||
example = literalExample "[ pkgs.stdenv ]";
|
||
description = ''
|
||
This option lists additional derivations to be included in the
|
||
Nix store in the generated ISO image.
|
||
'';
|
||
};
|
||
|
||
isoImage.includeSystemBuildDependencies = mkOption {
|
||
default = false;
|
||
description = ''
|
||
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.makeEfiBootable = mkOption {
|
||
default = false;
|
||
description = ''
|
||
Whether the ISO image should be an efi-bootable volume.
|
||
'';
|
||
};
|
||
|
||
isoImage.makeUsbBootable = mkOption {
|
||
default = false;
|
||
description = ''
|
||
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 = ''
|
||
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 = ''
|
||
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 = ''
|
||
The grub2 theme used for UEFI boot.
|
||
'';
|
||
};
|
||
|
||
isoImage.appendToMenuLabel = mkOption {
|
||
default = " Installer";
|
||
example = " Live System";
|
||
description = ''
|
||
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 <literal>XXX</literal>:
|
||
|
||
<para><literal>NixOS 99.99-pre666XXX</literal></para>
|
||
'';
|
||
};
|
||
|
||
};
|
||
|
||
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 ${toomany} characters longer than the limit of 32.";
|
||
}
|
||
];
|
||
|
||
boot.loader.grub.version = 2;
|
||
|
||
# Don't build the GRUB menu builder script, since we don't need it
|
||
# here and it causes a cyclic dependency.
|
||
boot.loader.grub.enable = false;
|
||
|
||
environment.systemPackages = [ grubPkgs.grub2 grubPkgs.grub2_efi ]
|
||
++ optional canx86BiosBoot pkgs.syslinux
|
||
;
|
||
|
||
# In stage 1 of the boot, mount the CD as the root FS by label so
|
||
# that we don't need to know its device. We pass the label of the
|
||
# root filesystem on the kernel command line, rather than in
|
||
# `fileSystems' below. This allows CD-to-USB converters such as
|
||
# UNetbootin to rewrite the kernel command line to pass the label or
|
||
# UUID of the USB stick. It would be nicer to write
|
||
# `root=/dev/disk/by-label/...' here, but UNetbootin doesn't
|
||
# recognise that.
|
||
boot.kernelParams =
|
||
[ "root=LABEL=${config.isoImage.volumeID}"
|
||
"boot.shell_on_fail"
|
||
];
|
||
|
||
fileSystems."/" =
|
||
{ 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.
|
||
fileSystems."/iso" =
|
||
{ 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.
|
||
fileSystems."/nix/.ro-store" =
|
||
{ fsType = "squashfs";
|
||
device = "/iso/nix-store.squashfs";
|
||
options = [ "loop" ];
|
||
neededForBoot = true;
|
||
};
|
||
|
||
fileSystems."/nix/.rw-store" =
|
||
{ fsType = "tmpfs";
|
||
options = [ "mode=0755" ];
|
||
neededForBoot = true;
|
||
};
|
||
|
||
fileSystems."/nix/store" =
|
||
{ fsType = "overlay";
|
||
device = "overlay";
|
||
options = [
|
||
"lowerdir=/nix/.ro-store"
|
||
"upperdir=/nix/.rw-store/store"
|
||
"workdir=/nix/.rw-store/work"
|
||
];
|
||
};
|
||
|
||
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 = config.isoImage.splashImage;
|
||
target = "/isolinux/background.png";
|
||
}
|
||
{ source = pkgs.writeText "version" config.system.nixos.label;
|
||
target = "/version.txt";
|
||
}
|
||
] ++ optionals canx86BiosBoot [
|
||
{ 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";
|
||
}
|
||
] ++ optionals (config.boot.loader.grub.memtest86.enable && canx86BiosBoot) [
|
||
{ source = "${pkgs.memtest86plus}/memtest.bin";
|
||
target = "/boot/memtest.bin";
|
||
}
|
||
] ++ optionals (config.isoImage.grubTheme != null) [
|
||
{ source = config.isoImage.grubTheme;
|
||
target = "/EFI/boot/grub-theme";
|
||
}
|
||
] ++ [
|
||
{ source = config.isoImage.efiSplashImage;
|
||
target = "/EFI/boot/efi-background.png";
|
||
}
|
||
];
|
||
|
||
boot.loader.timeout = 10;
|
||
|
||
# Create the ISO image.
|
||
system.build.isoImage = pkgs.callPackage ../../../lib/make-iso9660-image.nix ({
|
||
inherit (config.isoImage) isoName compressImage volumeID contents;
|
||
bootable = canx86BiosBoot;
|
||
bootImage = "/isolinux/isolinux.bin";
|
||
syslinux = if canx86BiosBoot then pkgs.syslinux else null;
|
||
} // optionalAttrs (config.isoImage.makeUsbBootable && canx86BiosBoot) {
|
||
usbBootable = true;
|
||
isohybridMbrImage = "${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" ];
|
||
|
||
};
|
||
|
||
}
|