{ config, pkgs, ... }: with pkgs.lib; { imports = [ ../profiles/headless.nix ../profiles/qemu-guest.nix ]; system.build.googleComputeImage = pkgs.vmTools.runInLinuxVM ( pkgs.runCommand "google-compute-image" { preVM = '' mkdir $out diskImage=$out/$diskImageBase truncate $diskImage --size 10G mv closure xchg/ ''; postVM = '' PATH=$PATH:${pkgs.gnutar}/bin:${pkgs.gzip}/bin pushd $out tar -Szcf $diskImageBase.tar.gz $diskImageBase rm $out/$diskImageBase popd ''; diskImageBase = "nixos-${config.system.nixosVersion}-${pkgs.stdenv.system}.raw"; buildInputs = [ pkgs.utillinux pkgs.perl ]; exportReferencesGraph = [ "closure" config.system.build.toplevel ]; } '' # Create partition table ${pkgs.parted}/sbin/parted /dev/vda mklabel msdos ${pkgs.parted}/sbin/parted /dev/vda mkpart primary ext4 1 10G ${pkgs.parted}/sbin/parted /dev/vda print . /sys/class/block/vda1/uevent mknod /dev/vda1 b $MAJOR $MINOR # Create an empty filesystem and mount it. ${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda1 ${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1 mkdir /mnt mount /dev/vda1 /mnt # The initrd expects these directories to exist. mkdir /mnt/dev /mnt/proc /mnt/sys mount --bind /proc /mnt/proc mount --bind /dev /mnt/dev mount --bind /sys /mnt/sys # Copy all paths in the closure to the filesystem. storePaths=$(perl ${pkgs.pathsFromGraph} /tmp/xchg/closure) mkdir -p /mnt/nix/store echo "copying everything (will take a while)..." cp -prd $storePaths /mnt/nix/store/ # Register the paths in the Nix database. printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \ chroot /mnt ${config.nix.package}/bin/nix-store --load-db # Create the system profile to allow nixos-rebuild to work. chroot /mnt ${config.nix.package}/bin/nix-env \ -p /nix/var/nix/profiles/system --set ${config.system.build.toplevel} # `nixos-rebuild' requires an /etc/NIXOS. mkdir -p /mnt/etc 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 # Install a configuration.nix. mkdir -p /mnt/etc/nixos /mnt/boot/grub cp ${./google-compute-config.nix} /mnt/etc/nixos/configuration.nix # Generate the GRUB menu. ln -s vda /dev/sda chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot umount /mnt/proc /mnt/dev /mnt/sys umount /mnt '' ); fileSystems."/".label = "nixos"; boot.kernelParams = [ "console=ttyS0" "panic=1" "boot.panic_on_fail" ]; boot.initrd.kernelModules = [ "virtio_scsi" ]; # Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd. boot.loader.grub.device = "/dev/sda"; boot.loader.grub.timeout = 0; # Don't put old configurations in the GRUB menu. The user has no # way to select them anyway. boot.loader.grub.configurationLimit = 0; # Allow root logins only using the SSH key that the user specified # at instance creation time. services.openssh.enable = true; services.openssh.permitRootLogin = "without-password"; # Force getting the hostname from Google Compute. networking.hostName = mkDefault ""; # Always include cryptsetup so that NixOps can use it. environment.systemPackages = [ pkgs.cryptsetup ]; # Prevent logging in as root without a password. This doesn't really matter, # since the only PAM services that allow logging in with a null # password are local ones that are inaccessible on Google Compute machines. security.initialRootPassword = mkDefault "!"; # Configure default metadata hostnames networking.extraHosts = '' 169.254.169.254 metadata.google.internal metadata ''; systemd.services.fetch-root-authorized-keys = { description = "Fetch authorized_keys for root user"; wantedBy = [ "multi-user.target" ]; before = [ "sshd.service" ]; after = [ "network.target" ]; path = [ pkgs.curl ]; script = '' # Don't download the SSH key if it has already been downloaded if ! [ -e /root/.ssh/authorized_keys ]; then echo "obtaining SSH key..." mkdir -p /root/.ssh curl -o /root/authorized-keys-metadata http://metadata/0.1/meta-data/authorized-keys if [ $? -eq 0 -a -e /root/authorized-keys-metadata ]; then cat /root/authorized-keys-metadata | cut -d: -f2- > /root/key.pub if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then cat /root/key.pub >> /root/.ssh/authorized_keys echo "new key added to authorized_keys" fi chmod 600 /root/.ssh/authorized_keys rm -f /root/key.pub /root/authorized-keys-metadata fi fi ''; serviceConfig.Type = "oneshot"; serviceConfig.RemainAfterExit = true; }; }