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|
configuration_file: { pkgs ? import <nixpkgs> {}, system ? builtins.currentSystem, myEnv, ... }:
let
config = (import <nixpkgs/nixos/lib/eval-config.nix> {
inherit system;
modules = [ {
myEnv = myEnv;
imports = [ configuration_file ];
# We want our template image to be as small as possible, but the deployed image should be able to be
# of any size. Hence we resize on the first boot.
systemd.services.resize-main-fs = {
wantedBy = [ "multi-user.target" ];
serviceConfig.Type = "oneshot";
script =
''
# Resize main partition to fill whole disk
echo ", +" | ${pkgs.utillinux}/bin/sfdisk /dev/vda --no-reread -N 1
${pkgs.parted}/bin/partprobe
# Resize filesystem
${pkgs.e2fsprogs}/bin/resize2fs /dev/vda1
'';
};
} ];
}).config;
in pkgs.vmTools.runInLinuxVM (
pkgs.runCommand "nixos-base-image"
{
memSize = 768;
preVM =
''
mkdir $out
diskImage=image.qcow2
${pkgs.vmTools.qemu}/bin/qemu-img create -f qcow2 $diskImage 2G
mv closure xchg/
'';
postVM =
''
echo compressing VM image...
${pkgs.vmTools.qemu}/bin/qemu-img convert -c $diskImage -O qcow2 $out/nixos.qcow2
'';
buildInputs = [ pkgs.utillinux pkgs.perl pkgs.parted pkgs.e2fsprogs ];
exportReferencesGraph =
[ "closure" config.system.build.toplevel ];
}
''
# Create the partition
parted /dev/vda mklabel msdos
parted /dev/vda -- mkpart primary ext4 1M -1s
# Format the partition
mkfs.ext4 -L nixos /dev/vda1
mkdir /mnt
mount /dev/vda1 /mnt
for dir in dev proc sys; do
mkdir /mnt/$dir
mount --bind /$dir /mnt/$dir
done
storePaths=$(perl ${pkgs.pathsFromGraph} /tmp/xchg/closure)
echo filling Nix store...
mkdir -p /mnt/nix/store
set -f
cp -prd $storePaths /mnt/nix/store
# The permissions will be set up incorrectly if the host machine is not running NixOS
chown -R 0:30000 /mnt/nix/store
mkdir -p /mnt/etc/nix
echo 'build-users-group = ' > /mnt/etc/nix/nix.conf
# Register the paths in the Nix database.
export USER=root
printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \
chroot /mnt ${config.nix.package.out}/bin/nix-store --load-db
# Create the system profile to allow nixos-rebuild to work.
chroot /mnt ${config.nix.package.out}/bin/nix-env \
-p /nix/var/nix/profiles/system --set ${config.system.build.toplevel}
# `nixos-rebuild' requires an /etc/NIXOS.
mkdir -p /mnt/etc/nixos
touch /mnt/etc/NIXOS
# `switch-to-configuration' requires a /bin/sh
mkdir -p /mnt/bin
ln -s ${config.system.build.binsh}/bin/sh /mnt/bin/sh
# Generate the GRUB menu.
chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
umount /mnt/{proc,dev,sys}
umount /mnt
''
)
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