mirror of
https://github.com/ilyakooo0/nixpkgs.git
synced 2024-11-10 16:45:51 +03:00
e8cc900eae
The `nix` command is marked as experimental since 2.4, so an extra flag is required to unlock it.
444 lines
15 KiB
Nix
444 lines
15 KiB
Nix
{ pkgs
|
||
, lib
|
||
|
||
, # The NixOS configuration to be installed onto the disk image.
|
||
config
|
||
|
||
, # The size of the disk, in megabytes.
|
||
# if "auto" size is calculated based on the contents copied to it and
|
||
# additionalSpace is taken into account.
|
||
diskSize ? "auto"
|
||
|
||
, # additional disk space to be added to the image if diskSize "auto"
|
||
# is used
|
||
additionalSpace ? "512M"
|
||
|
||
, # size of the boot partition, is only used if partitionTableType is
|
||
# either "efi" or "hybrid"
|
||
# This will be undersized slightly, as this is actually the offset of
|
||
# the end of the partition. Generally it will be 1MiB smaller.
|
||
bootSize ? "256M"
|
||
|
||
, # The files and directories to be placed in the target file system.
|
||
# This is a list of attribute sets {source, target, mode, user, group} where
|
||
# `source' is the file system object (regular file or directory) to be
|
||
# grafted in the file system at path `target', `mode' is a string containing
|
||
# the permissions that will be set (ex. "755"), `user' and `group' are the
|
||
# user and group name that will be set as owner of the files.
|
||
# `mode', `user', and `group' are optional.
|
||
# When setting one of `user' or `group', the other needs to be set too.
|
||
contents ? []
|
||
|
||
, # Type of partition table to use; either "legacy", "efi", or "none".
|
||
# For "efi" images, the GPT partition table is used and a mandatory ESP
|
||
# partition of reasonable size is created in addition to the root partition.
|
||
# For "legacy", the msdos partition table is used and a single large root
|
||
# partition is created.
|
||
# For "legacy+gpt", the GPT partition table is used, a 1MiB no-fs partition for
|
||
# use by the bootloader is created, and a single large root partition is
|
||
# created.
|
||
# For "hybrid", the GPT partition table is used and a mandatory ESP
|
||
# partition of reasonable size is created in addition to the root partition.
|
||
# Also a legacy MBR will be present.
|
||
# For "none", no partition table is created. Enabling `installBootLoader`
|
||
# most likely fails as GRUB will probably refuse to install.
|
||
partitionTableType ? "legacy"
|
||
|
||
, # Whether to invoke `switch-to-configuration boot` during image creation
|
||
installBootLoader ? true
|
||
|
||
, # The root file system type.
|
||
fsType ? "ext4"
|
||
|
||
, # Filesystem label
|
||
label ? if onlyNixStore then "nix-store" else "nixos"
|
||
|
||
, # The initial NixOS configuration file to be copied to
|
||
# /etc/nixos/configuration.nix.
|
||
configFile ? null
|
||
|
||
, # Shell code executed after the VM has finished.
|
||
postVM ? ""
|
||
|
||
, # Copy the contents of the Nix store to the root of the image and
|
||
# skip further setup. Incompatible with `contents`,
|
||
# `installBootLoader` and `configFile`.
|
||
onlyNixStore ? false
|
||
|
||
, name ? "nixos-disk-image"
|
||
|
||
, # Disk image format, one of qcow2, qcow2-compressed, vdi, vpc, raw.
|
||
format ? "raw"
|
||
|
||
, # Whether a nix channel based on the current source tree should be
|
||
# made available inside the image. Useful for interactive use of nix
|
||
# utils, but changes the hash of the image when the sources are
|
||
# updated.
|
||
copyChannel ? true
|
||
|
||
, # Additional store paths to copy to the image's store.
|
||
additionalPaths ? []
|
||
}:
|
||
|
||
assert partitionTableType == "legacy" || partitionTableType == "legacy+gpt" || partitionTableType == "efi" || partitionTableType == "hybrid" || partitionTableType == "none";
|
||
# We use -E offset=X below, which is only supported by e2fsprogs
|
||
assert partitionTableType != "none" -> fsType == "ext4";
|
||
# Either both or none of {user,group} need to be set
|
||
assert lib.all
|
||
(attrs: ((attrs.user or null) == null)
|
||
== ((attrs.group or null) == null))
|
||
contents;
|
||
assert onlyNixStore -> contents == [] && configFile == null && !installBootLoader;
|
||
|
||
with lib;
|
||
|
||
let format' = format; in let
|
||
|
||
format = if format' == "qcow2-compressed" then "qcow2" else format';
|
||
|
||
compress = optionalString (format' == "qcow2-compressed") "-c";
|
||
|
||
filename = "nixos." + {
|
||
qcow2 = "qcow2";
|
||
vdi = "vdi";
|
||
vpc = "vhd";
|
||
raw = "img";
|
||
}.${format} or format;
|
||
|
||
rootPartition = { # switch-case
|
||
legacy = "1";
|
||
"legacy+gpt" = "2";
|
||
efi = "2";
|
||
hybrid = "3";
|
||
}.${partitionTableType};
|
||
|
||
partitionDiskScript = { # switch-case
|
||
legacy = ''
|
||
parted --script $diskImage -- \
|
||
mklabel msdos \
|
||
mkpart primary ext4 1MiB -1
|
||
'';
|
||
"legacy+gpt" = ''
|
||
parted --script $diskImage -- \
|
||
mklabel gpt \
|
||
mkpart no-fs 1MB 2MB \
|
||
set 1 bios_grub on \
|
||
align-check optimal 1 \
|
||
mkpart primary ext4 2MB -1 \
|
||
align-check optimal 2 \
|
||
print
|
||
'';
|
||
efi = ''
|
||
parted --script $diskImage -- \
|
||
mklabel gpt \
|
||
mkpart ESP fat32 8MiB ${bootSize} \
|
||
set 1 boot on \
|
||
mkpart primary ext4 ${bootSize} -1
|
||
'';
|
||
hybrid = ''
|
||
parted --script $diskImage -- \
|
||
mklabel gpt \
|
||
mkpart ESP fat32 8MiB ${bootSize} \
|
||
set 1 boot on \
|
||
mkpart no-fs 0 1024KiB \
|
||
set 2 bios_grub on \
|
||
mkpart primary ext4 ${bootSize} -1
|
||
'';
|
||
none = "";
|
||
}.${partitionTableType};
|
||
|
||
nixpkgs = cleanSource pkgs.path;
|
||
|
||
# FIXME: merge with channel.nix / make-channel.nix.
|
||
channelSources = 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} > $out/nixos/.version-suffix
|
||
'';
|
||
|
||
binPath = with pkgs; makeBinPath (
|
||
[ rsync
|
||
util-linux
|
||
parted
|
||
e2fsprogs
|
||
lkl
|
||
config.system.build.nixos-install
|
||
config.system.build.nixos-enter
|
||
nix
|
||
] ++ stdenv.initialPath);
|
||
|
||
# I'm preserving the line below because I'm going to search for it across nixpkgs to consolidate
|
||
# image building logic. The comment right below this now appears in 4 different places in nixpkgs :)
|
||
# !!! should use XML.
|
||
sources = map (x: x.source) contents;
|
||
targets = map (x: x.target) contents;
|
||
modes = map (x: x.mode or "''") contents;
|
||
users = map (x: x.user or "''") contents;
|
||
groups = map (x: x.group or "''") contents;
|
||
|
||
basePaths = [ config.system.build.toplevel ]
|
||
++ lib.optional copyChannel channelSources;
|
||
|
||
additionalPaths' = subtractLists basePaths additionalPaths;
|
||
|
||
closureInfo = pkgs.closureInfo {
|
||
rootPaths = basePaths ++ additionalPaths';
|
||
};
|
||
|
||
blockSize = toString (4 * 1024); # ext4fs block size (not block device sector size)
|
||
|
||
prepareImage = ''
|
||
export PATH=${binPath}
|
||
|
||
# Yes, mkfs.ext4 takes different units in different contexts. Fun.
|
||
sectorsToKilobytes() {
|
||
echo $(( ( "$1" * 512 ) / 1024 ))
|
||
}
|
||
|
||
sectorsToBytes() {
|
||
echo $(( "$1" * 512 ))
|
||
}
|
||
|
||
# Given lines of numbers, adds them together
|
||
sum_lines() {
|
||
local acc=0
|
||
while read -r number; do
|
||
acc=$((acc+number))
|
||
done
|
||
echo "$acc"
|
||
}
|
||
|
||
mebibyte=$(( 1024 * 1024 ))
|
||
|
||
# Approximative percentage of reserved space in an ext4 fs over 512MiB.
|
||
# 0.05208587646484375
|
||
# × 1000, integer part: 52
|
||
compute_fudge() {
|
||
echo $(( $1 * 52 / 1000 ))
|
||
}
|
||
|
||
mkdir $out
|
||
|
||
root="$PWD/root"
|
||
mkdir -p $root
|
||
|
||
# Copy arbitrary other files into the image
|
||
# Semi-shamelessly copied from make-etc.sh. I (@copumpkin) shall factor this stuff out as part of
|
||
# https://github.com/NixOS/nixpkgs/issues/23052.
|
||
set -f
|
||
sources_=(${concatStringsSep " " sources})
|
||
targets_=(${concatStringsSep " " targets})
|
||
modes_=(${concatStringsSep " " modes})
|
||
set +f
|
||
|
||
for ((i = 0; i < ''${#targets_[@]}; i++)); do
|
||
source="''${sources_[$i]}"
|
||
target="''${targets_[$i]}"
|
||
mode="''${modes_[$i]}"
|
||
|
||
if [ -n "$mode" ]; then
|
||
rsync_chmod_flags="--chmod=$mode"
|
||
else
|
||
rsync_chmod_flags=""
|
||
fi
|
||
# Unfortunately cptofs only supports modes, not ownership, so we can't use
|
||
# rsync's --chown option. Instead, we change the ownerships in the
|
||
# VM script with chown.
|
||
rsync_flags="-a --no-o --no-g $rsync_chmod_flags"
|
||
if [[ "$source" =~ '*' ]]; then
|
||
# If the source name contains '*', perform globbing.
|
||
mkdir -p $root/$target
|
||
for fn in $source; do
|
||
rsync $rsync_flags "$fn" $root/$target/
|
||
done
|
||
else
|
||
mkdir -p $root/$(dirname $target)
|
||
if ! [ -e $root/$target ]; then
|
||
rsync $rsync_flags $source $root/$target
|
||
else
|
||
echo "duplicate entry $target -> $source"
|
||
exit 1
|
||
fi
|
||
fi
|
||
done
|
||
|
||
export HOME=$TMPDIR
|
||
|
||
# Provide a Nix database so that nixos-install can copy closures.
|
||
export NIX_STATE_DIR=$TMPDIR/state
|
||
nix-store --load-db < ${closureInfo}/registration
|
||
|
||
chmod 755 "$TMPDIR"
|
||
echo "running nixos-install..."
|
||
nixos-install --root $root --no-bootloader --no-root-passwd \
|
||
--system ${config.system.build.toplevel} \
|
||
${if copyChannel then "--channel ${channelSources}" else "--no-channel-copy"} \
|
||
--substituters ""
|
||
|
||
${optionalString (additionalPaths' != []) ''
|
||
nix --extra-experimental-features nix-command copy --to $root --no-check-sigs ${concatStringsSep " " additionalPaths'}
|
||
''}
|
||
|
||
diskImage=nixos.raw
|
||
|
||
${if diskSize == "auto" then ''
|
||
${if partitionTableType == "efi" || partitionTableType == "hybrid" then ''
|
||
# Add the GPT at the end
|
||
gptSpace=$(( 512 * 34 * 1 ))
|
||
# Normally we'd need to account for alignment and things, if bootSize
|
||
# represented the actual size of the boot partition. But it instead
|
||
# represents the offset at which it ends.
|
||
# So we know bootSize is the reserved space in front of the partition.
|
||
reservedSpace=$(( gptSpace + $(numfmt --from=iec '${bootSize}') ))
|
||
'' else if partitionTableType == "legacy+gpt" then ''
|
||
# Add the GPT at the end
|
||
gptSpace=$(( 512 * 34 * 1 ))
|
||
# And include the bios_grub partition; the ext4 partition starts at 2MB exactly.
|
||
reservedSpace=$(( gptSpace + 2 * mebibyte ))
|
||
'' else if partitionTableType == "legacy" then ''
|
||
# Add the 1MiB aligned reserved space (includes MBR)
|
||
reservedSpace=$(( mebibyte ))
|
||
'' else ''
|
||
reservedSpace=0
|
||
''}
|
||
additionalSpace=$(( $(numfmt --from=iec '${additionalSpace}') + reservedSpace ))
|
||
|
||
# Compute required space in filesystem blocks
|
||
diskUsage=$(find . ! -type d -print0 | du --files0-from=- --apparent-size --block-size "${blockSize}" | cut -f1 | sum_lines)
|
||
# Each inode takes space!
|
||
numInodes=$(find . | wc -l)
|
||
# Convert to bytes, inodes take two blocks each!
|
||
diskUsage=$(( (diskUsage + 2 * numInodes) * ${blockSize} ))
|
||
# Then increase the required space to account for the reserved blocks.
|
||
fudge=$(compute_fudge $diskUsage)
|
||
requiredFilesystemSpace=$(( diskUsage + fudge ))
|
||
|
||
diskSize=$(( requiredFilesystemSpace + additionalSpace ))
|
||
|
||
# Round up to the nearest mebibyte.
|
||
# This ensures whole 512 bytes sector sizes in the disk image
|
||
# and helps towards aligning partitions optimally.
|
||
if (( diskSize % mebibyte )); then
|
||
diskSize=$(( ( diskSize / mebibyte + 1) * mebibyte ))
|
||
fi
|
||
|
||
truncate -s "$diskSize" $diskImage
|
||
|
||
printf "Automatic disk size...\n"
|
||
printf " Closure space use: %d bytes\n" $diskUsage
|
||
printf " fudge: %d bytes\n" $fudge
|
||
printf " Filesystem size needed: %d bytes\n" $requiredFilesystemSpace
|
||
printf " Additional space: %d bytes\n" $additionalSpace
|
||
printf " Disk image size: %d bytes\n" $diskSize
|
||
'' else ''
|
||
truncate -s ${toString diskSize}M $diskImage
|
||
''}
|
||
|
||
${partitionDiskScript}
|
||
|
||
${if partitionTableType != "none" then ''
|
||
# Get start & length of the root partition in sectors to $START and $SECTORS.
|
||
eval $(partx $diskImage -o START,SECTORS --nr ${rootPartition} --pairs)
|
||
|
||
mkfs.${fsType} -b ${blockSize} -F -L ${label} $diskImage -E offset=$(sectorsToBytes $START) $(sectorsToKilobytes $SECTORS)K
|
||
'' else ''
|
||
mkfs.${fsType} -b ${blockSize} -F -L ${label} $diskImage
|
||
''}
|
||
|
||
echo "copying staging root to image..."
|
||
cptofs -p ${optionalString (partitionTableType != "none") "-P ${rootPartition}"} \
|
||
-t ${fsType} \
|
||
-i $diskImage \
|
||
$root${optionalString onlyNixStore builtins.storeDir}/* / ||
|
||
(echo >&2 "ERROR: cptofs failed. diskSize might be too small for closure."; exit 1)
|
||
'';
|
||
|
||
moveOrConvertImage = ''
|
||
${if format == "raw" then ''
|
||
mv $diskImage $out/${filename}
|
||
'' else ''
|
||
${pkgs.qemu}/bin/qemu-img convert -f raw -O ${format} ${compress} $diskImage $out/${filename}
|
||
''}
|
||
diskImage=$out/${filename}
|
||
'';
|
||
|
||
buildImage = pkgs.vmTools.runInLinuxVM (
|
||
pkgs.runCommand name {
|
||
preVM = prepareImage;
|
||
buildInputs = with pkgs; [ util-linux e2fsprogs dosfstools ];
|
||
postVM = moveOrConvertImage + postVM;
|
||
memSize = 1024;
|
||
} ''
|
||
export PATH=${binPath}:$PATH
|
||
|
||
rootDisk=${if partitionTableType != "none" then "/dev/vda${rootPartition}" else "/dev/vda"}
|
||
|
||
# Some tools assume these exist
|
||
ln -s vda /dev/xvda
|
||
ln -s vda /dev/sda
|
||
# make systemd-boot find ESP without udev
|
||
mkdir /dev/block
|
||
ln -s /dev/vda1 /dev/block/254:1
|
||
|
||
mountPoint=/mnt
|
||
mkdir $mountPoint
|
||
mount $rootDisk $mountPoint
|
||
|
||
# Create the ESP and mount it. Unlike e2fsprogs, mkfs.vfat doesn't support an
|
||
# '-E offset=X' option, so we can't do this outside the VM.
|
||
${optionalString (partitionTableType == "efi" || partitionTableType == "hybrid") ''
|
||
mkdir -p /mnt/boot
|
||
mkfs.vfat -n ESP /dev/vda1
|
||
mount /dev/vda1 /mnt/boot
|
||
''}
|
||
|
||
# Install a configuration.nix
|
||
mkdir -p /mnt/etc/nixos
|
||
${optionalString (configFile != null) ''
|
||
cp ${configFile} /mnt/etc/nixos/configuration.nix
|
||
''}
|
||
|
||
${lib.optionalString installBootLoader ''
|
||
# Set up core system link, GRUB, etc.
|
||
NIXOS_INSTALL_BOOTLOADER=1 nixos-enter --root $mountPoint -- /nix/var/nix/profiles/system/bin/switch-to-configuration boot
|
||
|
||
# The above scripts will generate a random machine-id and we don't want to bake a single ID into all our images
|
||
rm -f $mountPoint/etc/machine-id
|
||
''}
|
||
|
||
# Set the ownerships of the contents. The modes are set in preVM.
|
||
# No globbing on targets, so no need to set -f
|
||
targets_=(${concatStringsSep " " targets})
|
||
users_=(${concatStringsSep " " users})
|
||
groups_=(${concatStringsSep " " groups})
|
||
for ((i = 0; i < ''${#targets_[@]}; i++)); do
|
||
target="''${targets_[$i]}"
|
||
user="''${users_[$i]}"
|
||
group="''${groups_[$i]}"
|
||
if [ -n "$user$group" ]; then
|
||
# We have to nixos-enter since we need to use the user and group of the VM
|
||
nixos-enter --root $mountPoint -- chown -R "$user:$group" "$target"
|
||
fi
|
||
done
|
||
|
||
umount -R /mnt
|
||
|
||
# Make sure resize2fs works. Note that resize2fs has stricter criteria for resizing than a normal
|
||
# mount, so the `-c 0` and `-i 0` don't affect it. Setting it to `now` doesn't produce deterministic
|
||
# output, of course, but we can fix that when/if we start making images deterministic.
|
||
${optionalString (fsType == "ext4") ''
|
||
tune2fs -T now -c 0 -i 0 $rootDisk
|
||
''}
|
||
''
|
||
);
|
||
in
|
||
if onlyNixStore then
|
||
pkgs.runCommand name {}
|
||
(prepareImage + moveOrConvertImage + postVM)
|
||
else buildImage
|