316 lines
8.8 KiB
Nix
316 lines
8.8 KiB
Nix
# Note: This is a private API, internal to NixOS. Its interface is subject
|
|
# to change without notice.
|
|
#
|
|
# The result of this builder is a single disk image, partitioned like this:
|
|
#
|
|
# * partition #1: a very small, 1MiB partition to leave room for Grub.
|
|
#
|
|
# * partition #2: boot, a partition formatted with FAT to be used for /boot.
|
|
# FAT is chosen to support EFI.
|
|
#
|
|
# * partition #3: nixos, a partition dedicated to a zpool.
|
|
#
|
|
# This single-disk approach does not satisfy ZFS's requirements for autoexpand,
|
|
# however automation can expand it anyway. For example, with
|
|
# `services.zfs.expandOnBoot`.
|
|
{ lib
|
|
, pkgs
|
|
, # The NixOS configuration to be installed onto the disk image.
|
|
config
|
|
|
|
, # size of the FAT partition, in megabytes.
|
|
bootSize ? 1024
|
|
|
|
, # memory allocated for virtualized build instance
|
|
memSize ? 1024
|
|
|
|
, # The size of the root partition, in megabytes.
|
|
rootSize ? 2048
|
|
|
|
, # The name of the ZFS pool
|
|
rootPoolName ? "tank"
|
|
|
|
, # zpool properties
|
|
rootPoolProperties ? {
|
|
autoexpand = "on";
|
|
}
|
|
, # pool-wide filesystem properties
|
|
rootPoolFilesystemProperties ? {
|
|
acltype = "posixacl";
|
|
atime = "off";
|
|
compression = "on";
|
|
mountpoint = "legacy";
|
|
xattr = "sa";
|
|
}
|
|
|
|
, # datasets, with per-attribute options:
|
|
# mount: (optional) mount point in the VM
|
|
# properties: (optional) ZFS properties on the dataset, like filesystemProperties
|
|
# Notes:
|
|
# 1. datasets will be created from shorter to longer names as a simple topo-sort
|
|
# 2. you should define a root's dataset's mount for `/`
|
|
datasets ? { }
|
|
|
|
, # The files and directories to be placed in the target file system.
|
|
# This is a list of attribute sets {source, target} where `source'
|
|
# is the file system object (regular file or directory) to be
|
|
# grafted in the file system at path `target'.
|
|
contents ? [ ]
|
|
|
|
, # The initial NixOS configuration file to be copied to
|
|
# /etc/nixos/configuration.nix. This configuration will be embedded
|
|
# inside a configuration which includes the described ZFS fileSystems.
|
|
configFile ? null
|
|
|
|
, # Shell code executed after the VM has finished.
|
|
postVM ? ""
|
|
|
|
, name ? "nixos-disk-image"
|
|
|
|
, # Disk image format, one of qcow2, qcow2-compressed, vdi, vpc, raw.
|
|
format ? "raw"
|
|
|
|
, # Include a copy of Nixpkgs in the disk image
|
|
includeChannel ? true
|
|
}:
|
|
let
|
|
formatOpt = if format == "qcow2-compressed" then "qcow2" else format;
|
|
|
|
compress = lib.optionalString (format == "qcow2-compressed") "-c";
|
|
|
|
filenameSuffix = "." + {
|
|
qcow2 = "qcow2";
|
|
vdi = "vdi";
|
|
vpc = "vhd";
|
|
raw = "img";
|
|
}.${formatOpt} or formatOpt;
|
|
rootFilename = "nixos.root${filenameSuffix}";
|
|
|
|
# FIXME: merge with channel.nix / make-channel.nix.
|
|
channelSources =
|
|
let
|
|
nixpkgs = lib.cleanSource pkgs.path;
|
|
in
|
|
pkgs.runCommand "nixos-${config.system.nixos.version}" { } ''
|
|
mkdir -p $out
|
|
cp -prd ${nixpkgs.outPath} $out/nixos
|
|
chmod -R u+w $out/nixos
|
|
if [ ! -e $out/nixos/nixpkgs ]; then
|
|
ln -s . $out/nixos/nixpkgs
|
|
fi
|
|
rm -rf $out/nixos/.git
|
|
echo -n ${config.system.nixos.versionSuffix} > $out/nixos/.version-suffix
|
|
'';
|
|
|
|
closureInfo = pkgs.closureInfo {
|
|
rootPaths = [ config.system.build.toplevel ]
|
|
++ (lib.optional includeChannel channelSources);
|
|
};
|
|
|
|
modulesTree = pkgs.aggregateModules
|
|
(with config.boot.kernelPackages; [ kernel zfs ]);
|
|
|
|
tools = lib.makeBinPath (
|
|
with pkgs; [
|
|
nixos-enter
|
|
config.system.build.nixos-install
|
|
dosfstools
|
|
e2fsprogs
|
|
gptfdisk
|
|
nix
|
|
parted
|
|
util-linux
|
|
zfs
|
|
]
|
|
);
|
|
|
|
hasDefinedMount = disk: ((disk.mount or null) != null);
|
|
|
|
stringifyProperties = prefix: properties: lib.concatStringsSep " \\\n" (
|
|
lib.mapAttrsToList
|
|
(
|
|
property: value: "${prefix} ${lib.escapeShellArg property}=${lib.escapeShellArg value}"
|
|
)
|
|
properties
|
|
);
|
|
|
|
createDatasets =
|
|
let
|
|
datasetlist = lib.mapAttrsToList lib.nameValuePair datasets;
|
|
sorted = lib.sort (left: right: (lib.stringLength left.name) < (lib.stringLength right.name)) datasetlist;
|
|
cmd = { name, value }:
|
|
let
|
|
properties = stringifyProperties "-o" (value.properties or { });
|
|
in
|
|
"zfs create -p ${properties} ${name}";
|
|
in
|
|
lib.concatMapStringsSep "\n" cmd sorted;
|
|
|
|
mountDatasets =
|
|
let
|
|
datasetlist = lib.mapAttrsToList lib.nameValuePair datasets;
|
|
mounts = lib.filter ({ value, ... }: hasDefinedMount value) datasetlist;
|
|
sorted = lib.sort (left: right: (lib.stringLength left.value.mount) < (lib.stringLength right.value.mount)) mounts;
|
|
cmd = { name, value }:
|
|
''
|
|
mkdir -p /mnt${lib.escapeShellArg value.mount}
|
|
mount -t zfs ${name} /mnt${lib.escapeShellArg value.mount}
|
|
'';
|
|
in
|
|
lib.concatMapStringsSep "\n" cmd sorted;
|
|
|
|
unmountDatasets =
|
|
let
|
|
datasetlist = lib.mapAttrsToList lib.nameValuePair datasets;
|
|
mounts = lib.filter ({ value, ... }: hasDefinedMount value) datasetlist;
|
|
sorted = lib.sort (left: right: (lib.stringLength left.value.mount) > (lib.stringLength right.value.mount)) mounts;
|
|
cmd = { name, value }:
|
|
''
|
|
umount /mnt${lib.escapeShellArg value.mount}
|
|
'';
|
|
in
|
|
lib.concatMapStringsSep "\n" cmd sorted;
|
|
|
|
|
|
fileSystemsCfgFile =
|
|
let
|
|
mountable = lib.filterAttrs (_: value: hasDefinedMount value) datasets;
|
|
in
|
|
pkgs.runCommand "filesystem-config.nix"
|
|
{
|
|
buildInputs = with pkgs; [ jq nixpkgs-fmt ];
|
|
filesystems = builtins.toJSON {
|
|
fileSystems = lib.mapAttrs'
|
|
(
|
|
dataset: attrs:
|
|
{
|
|
name = attrs.mount;
|
|
value = {
|
|
fsType = "zfs";
|
|
device = "${dataset}";
|
|
};
|
|
}
|
|
)
|
|
mountable;
|
|
};
|
|
passAsFile = [ "filesystems" ];
|
|
} ''
|
|
(
|
|
echo "builtins.fromJSON '''"
|
|
jq . < "$filesystemsPath"
|
|
echo "'''"
|
|
) > $out
|
|
|
|
nixpkgs-fmt $out
|
|
'';
|
|
|
|
mergedConfig =
|
|
if configFile == null
|
|
then fileSystemsCfgFile
|
|
else
|
|
pkgs.runCommand "configuration.nix"
|
|
{
|
|
buildInputs = with pkgs; [ nixpkgs-fmt ];
|
|
}
|
|
''
|
|
(
|
|
echo '{ imports = ['
|
|
printf "(%s)\n" "$(cat ${fileSystemsCfgFile})";
|
|
printf "(%s)\n" "$(cat ${configFile})";
|
|
echo ']; }'
|
|
) > $out
|
|
|
|
nixpkgs-fmt $out
|
|
'';
|
|
|
|
image = (
|
|
pkgs.vmTools.override {
|
|
rootModules =
|
|
[ "zfs" "9p" "9pnet_virtio" "virtio_pci" "virtio_blk" ] ++
|
|
(pkgs.lib.optional pkgs.stdenv.hostPlatform.isx86 "rtc_cmos");
|
|
kernel = modulesTree;
|
|
}
|
|
).runInLinuxVM (
|
|
pkgs.runCommand name
|
|
{
|
|
inherit memSize;
|
|
QEMU_OPTS = "-drive file=$rootDiskImage,if=virtio,cache=unsafe,werror=report";
|
|
preVM = ''
|
|
PATH=$PATH:${pkgs.qemu_kvm}/bin
|
|
mkdir $out
|
|
|
|
rootDiskImage=root.raw
|
|
qemu-img create -f raw $rootDiskImage ${toString (bootSize + rootSize)}M
|
|
'';
|
|
|
|
postVM = ''
|
|
${if formatOpt == "raw" then ''
|
|
mv $rootDiskImage $out/${rootFilename}
|
|
'' else ''
|
|
${pkgs.qemu_kvm}/bin/qemu-img convert -f raw -O ${formatOpt} ${compress} $rootDiskImage $out/${rootFilename}
|
|
''}
|
|
rootDiskImage=$out/${rootFilename}
|
|
set -x
|
|
${postVM}
|
|
'';
|
|
} ''
|
|
export PATH=${tools}:$PATH
|
|
set -x
|
|
|
|
cp -sv /dev/vda /dev/sda
|
|
cp -sv /dev/vda /dev/xvda
|
|
|
|
parted --script /dev/vda -- \
|
|
mklabel gpt \
|
|
mkpart no-fs 1MiB 2MiB \
|
|
set 1 bios_grub on \
|
|
align-check optimal 1 \
|
|
mkpart primary fat32 2MiB ${toString bootSize}MiB \
|
|
align-check optimal 2 \
|
|
mkpart primary fat32 ${toString bootSize}MiB -1MiB \
|
|
align-check optimal 3 \
|
|
print
|
|
|
|
sfdisk --dump /dev/vda
|
|
|
|
|
|
zpool create \
|
|
${stringifyProperties " -o" rootPoolProperties} \
|
|
${stringifyProperties " -O" rootPoolFilesystemProperties} \
|
|
${rootPoolName} /dev/vda3
|
|
parted --script /dev/vda -- print
|
|
|
|
${createDatasets}
|
|
${mountDatasets}
|
|
|
|
mkdir -p /mnt/boot
|
|
mkfs.vfat -n ESP /dev/vda2
|
|
mount /dev/vda2 /mnt/boot
|
|
|
|
mount
|
|
|
|
# Install a configuration.nix
|
|
mkdir -p /mnt/etc/nixos
|
|
# `cat` so it is mutable on the fs
|
|
cat ${mergedConfig} > /mnt/etc/nixos/configuration.nix
|
|
|
|
export NIX_STATE_DIR=$TMPDIR/state
|
|
nix-store --load-db < ${closureInfo}/registration
|
|
|
|
nixos-install \
|
|
--root /mnt \
|
|
--no-root-passwd \
|
|
--system ${config.system.build.toplevel} \
|
|
--substituters "" \
|
|
${lib.optionalString includeChannel ''--channel ${channelSources}''}
|
|
|
|
df -h
|
|
|
|
umount /mnt/boot
|
|
${unmountDatasets}
|
|
|
|
zpool export ${rootPoolName}
|
|
''
|
|
);
|
|
in
|
|
image
|