mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-24 22:50:49 +00:00
248 lines
7.7 KiB
Nix
248 lines
7.7 KiB
Nix
{ pkgs
|
|
, lib
|
|
|
|
, # The NixOS configuration to be installed onto the disk image.
|
|
config
|
|
|
|
, # The size of the disk, in megabytes.
|
|
diskSize
|
|
|
|
# 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 ? []
|
|
|
|
, # 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.
|
|
# If `installBootLoader` is true, GRUB will be installed in EFI mode.
|
|
# For "legacy", the msdos partition table is used and a single large root
|
|
# partition is created. If `installBootLoader` is true, GRUB will be
|
|
# installed in legacy mode.
|
|
# For "none", no partition table is created. Enabling `installBootLoader`
|
|
# most likely fails as GRUB will probably refuse to install.
|
|
partitionTableType ? "legacy"
|
|
|
|
, # The root file system type.
|
|
fsType ? "ext4"
|
|
|
|
, # Filesystem label
|
|
label ? "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 ? ""
|
|
|
|
, name ? "nixos-disk-image"
|
|
|
|
, # Disk image format, one of qcow2, qcow2-compressed, vpc, raw.
|
|
format ? "raw"
|
|
}:
|
|
|
|
assert partitionTableType == "legacy" || partitionTableType == "efi" || partitionTableType == "none";
|
|
# We use -E offset=X below, which is only supported by e2fsprogs
|
|
assert partitionTableType != "none" -> fsType == "ext4";
|
|
|
|
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";
|
|
vpc = "vhd";
|
|
raw = "img";
|
|
}.${format};
|
|
|
|
rootPartition = { # switch-case
|
|
legacy = "1";
|
|
efi = "2";
|
|
}.${partitionTableType};
|
|
|
|
partitionDiskScript = { # switch-case
|
|
legacy = ''
|
|
parted --script $diskImage -- \
|
|
mklabel msdos \
|
|
mkpart primary ext4 1MiB -1
|
|
'';
|
|
efi = ''
|
|
parted --script $diskImage -- \
|
|
mklabel gpt \
|
|
mkpart ESP fat32 8MiB 256MiB \
|
|
set 1 boot on \
|
|
mkpart primary ext4 256MiB -1
|
|
'';
|
|
none = "";
|
|
}.${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} > $out/nixos/.version-suffix
|
|
'';
|
|
|
|
binPath = with pkgs; makeBinPath (
|
|
[ rsync
|
|
utillinux
|
|
parted
|
|
e2fsprogs
|
|
lkl
|
|
config.system.build.nixos-install
|
|
config.system.build.nixos-enter
|
|
nix
|
|
] ++ stdenv.initialPath);
|
|
|
|
# I'm preserving the line below because I'm going to search for it across nixpkgs to consolidate
|
|
# image building logic. The comment right below this now appears in 4 different places in nixpkgs :)
|
|
# !!! should use XML.
|
|
sources = map (x: x.source) contents;
|
|
targets = map (x: x.target) contents;
|
|
|
|
closureInfo = pkgs.closureInfo { rootPaths = [ config.system.build.toplevel channelSources ]; };
|
|
|
|
prepareImage = ''
|
|
export PATH=${binPath}
|
|
|
|
# Yes, mkfs.ext4 takes different units in different contexts. Fun.
|
|
sectorsToKilobytes() {
|
|
echo $(( ( "$1" * 512 ) / 1024 ))
|
|
}
|
|
|
|
sectorsToBytes() {
|
|
echo $(( "$1" * 512 ))
|
|
}
|
|
|
|
mkdir $out
|
|
diskImage=nixos.raw
|
|
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} -F -L ${label} $diskImage -E offset=$(sectorsToBytes $START) $(sectorsToKilobytes $SECTORS)K
|
|
'' else ''
|
|
mkfs.${fsType} -F -L ${label} $diskImage
|
|
''}
|
|
|
|
root="$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_=(${concatStringsSep " " targets})
|
|
set +f
|
|
|
|
for ((i = 0; i < ''${#targets_[@]}; i++)); do
|
|
source="''${sources_[$i]}"
|
|
target="''${targets_[$i]}"
|
|
|
|
if [[ "$source" =~ '*' ]]; then
|
|
# If the source name contains '*', perform globbing.
|
|
mkdir -p $root/$target
|
|
for fn in $source; do
|
|
rsync -a --no-o --no-g "$fn" $root/$target/
|
|
done
|
|
else
|
|
mkdir -p $root/$(dirname $target)
|
|
if ! [ -e $root/$target ]; then
|
|
rsync -a --no-o --no-g $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
|
|
|
|
echo "running nixos-install..."
|
|
nixos-install --root $root --no-bootloader --no-root-passwd \
|
|
--system ${config.system.build.toplevel} --channel ${channelSources} --substituters ""
|
|
|
|
echo "copying staging root to image..."
|
|
cptofs -p ${optionalString (partitionTableType != "none") "-P ${rootPartition}"} -t ${fsType} -i $diskImage $root/* /
|
|
'';
|
|
in pkgs.vmTools.runInLinuxVM (
|
|
pkgs.runCommand name
|
|
{ preVM = prepareImage;
|
|
buildInputs = with pkgs; [ utillinux e2fsprogs dosfstools ];
|
|
postVM = ''
|
|
${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}
|
|
${postVM}
|
|
'';
|
|
memSize = 1024;
|
|
}
|
|
''
|
|
export PATH=${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
|
|
|
|
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") ''
|
|
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
|
|
''}
|
|
|
|
# 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
|
|
|
|
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
|
|
''}
|
|
''
|
|
)
|