diff options
Diffstat (limited to 'nixos/modules/virtualisation/brightbox-image.nix')
| -rw-r--r-- | nixos/modules/virtualisation/brightbox-image.nix | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/nixos/modules/virtualisation/brightbox-image.nix b/nixos/modules/virtualisation/brightbox-image.nix new file mode 100644 index 00000000000..9641b693f18 --- /dev/null +++ b/nixos/modules/virtualisation/brightbox-image.nix @@ -0,0 +1,166 @@ +{ config, lib, pkgs, ... }: + +with lib; +let + diskSize = "20G"; +in +{ + imports = [ ../profiles/headless.nix ../profiles/qemu-guest.nix ]; + + system.build.brightboxImage = + pkgs.vmTools.runInLinuxVM ( + pkgs.runCommand "brightbox-image" + { preVM = + '' + mkdir $out + diskImage=$out/$diskImageBase + truncate $diskImage --size ${diskSize} + mv closure xchg/ + ''; + + postVM = + '' + PATH=$PATH:${lib.makeBinPath [ pkgs.gnutar pkgs.gzip ]} + pushd $out + ${pkgs.qemu_kvm}/bin/qemu-img convert -c -O qcow2 $diskImageBase nixos.qcow2 + rm $diskImageBase + popd + ''; + diskImageBase = "nixos-image-${config.system.nixos.label}-${pkgs.stdenv.hostPlatform.system}.raw"; + buildInputs = [ pkgs.util-linux pkgs.perl ]; + exportReferencesGraph = + [ "closure" config.system.build.toplevel ]; + } + '' + # Create partition table + ${pkgs.parted}/sbin/parted --script /dev/vda mklabel msdos + ${pkgs.parted}/sbin/parted --script /dev/vda mkpart primary ext4 1 ${diskSize} + ${pkgs.parted}/sbin/parted --script /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.out}/bin/nix-store --load-db --option build-users-group "" + + # 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} \ + --option build-users-group "" + + # `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 ${./brightbox-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"; + + # Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd. + boot.loader.grub.device = "/dev/vda"; + boot.loader.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 = "prohibit-password"; + + # Force getting the hostname from Google Compute. + networking.hostName = mkDefault ""; + + # Always include cryptsetup so that NixOps can use it. + environment.systemPackages = [ pkgs.cryptsetup ]; + + systemd.services.fetch-ec2-data = + { description = "Fetch EC2 Data"; + + wantedBy = [ "multi-user.target" "sshd.service" ]; + before = [ "sshd.service" ]; + wants = [ "network-online.target" ]; + after = [ "network-online.target" ]; + + path = [ pkgs.wget pkgs.iproute2 ]; + + script = + '' + wget="wget -q --retry-connrefused -O -" + + ${optionalString (config.networking.hostName == "") '' + echo "setting host name..." + ${pkgs.nettools}/bin/hostname $($wget http://169.254.169.254/latest/meta-data/hostname) + ''} + + # Don't download the SSH key if it has already been injected + # into the image (a Nova feature). + if ! [ -e /root/.ssh/authorized_keys ]; then + echo "obtaining SSH key..." + mkdir -m 0700 -p /root/.ssh + $wget http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key > /root/key.pub + if [ $? -eq 0 -a -e /root/key.pub ]; then + 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 + fi + fi + + # Extract the intended SSH host key for this machine from + # the supplied user data, if available. Otherwise sshd will + # generate one normally. + $wget http://169.254.169.254/2011-01-01/user-data > /root/user-data || true + key="$(sed 's/|/\n/g; s/SSH_HOST_DSA_KEY://; t; d' /root/user-data)" + key_pub="$(sed 's/SSH_HOST_DSA_KEY_PUB://; t; d' /root/user-data)" + if [ -n "$key" -a -n "$key_pub" -a ! -e /etc/ssh/ssh_host_dsa_key ]; then + mkdir -m 0755 -p /etc/ssh + (umask 077; echo "$key" > /etc/ssh/ssh_host_dsa_key) + echo "$key_pub" > /etc/ssh/ssh_host_dsa_key.pub + fi + ''; + + serviceConfig.Type = "oneshot"; + serviceConfig.RemainAfterExit = true; + }; + +} |