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Add initial Brightbox expression.
This commit is contained in:
Rob Vermaas
parent
892c4ffb8a
commit
55d9786289
5
nixos/modules/virtualisation/brightbox-config.nix
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5
nixos/modules/virtualisation/brightbox-config.nix
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@ -0,0 +1,5 @@
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{ config, pkgs, modulesPath, ... }:
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{
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imports = [ "${modulesPath}/virtualisation/brightbox-image.nix" ];
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}
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166
nixos/modules/virtualisation/brightbox-image.nix
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166
nixos/modules/virtualisation/brightbox-image.nix
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@ -0,0 +1,166 @@
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{ config, lib, pkgs, ... }:
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with lib;
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let
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diskSize = "20G";
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in
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{
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imports = [ ../profiles/headless.nix ../profiles/qemu-guest.nix ];
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system.build.brightboxImage =
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pkgs.vmTools.runInLinuxVM (
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pkgs.runCommand "brightbox-image"
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{ preVM =
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''
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mkdir $out
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diskImage=$out/$diskImageBase
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truncate $diskImage --size ${diskSize}
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mv closure xchg/
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'';
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postVM =
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''
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PATH=$PATH:${pkgs.gnutar}/bin:${pkgs.gzip}/bin
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pushd $out
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${pkgs.qemu_kvm}/bin/qemu-img convert -c -O qcow2 $diskImageBase nixos.qcow2
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rm $diskImageBase
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popd
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'';
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diskImageBase = "nixos-${config.system.nixosVersion}-${pkgs.stdenv.system}.raw";
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buildInputs = [ pkgs.utillinux pkgs.perl ];
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exportReferencesGraph =
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[ "closure" config.system.build.toplevel ];
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}
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''
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# Create partition table
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${pkgs.parted}/sbin/parted /dev/vda mklabel msdos
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${pkgs.parted}/sbin/parted /dev/vda mkpart primary ext4 1 ${diskSize}
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${pkgs.parted}/sbin/parted /dev/vda print
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. /sys/class/block/vda1/uevent
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mknod /dev/vda1 b $MAJOR $MINOR
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# Create an empty filesystem and mount it.
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${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda1
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${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1
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mkdir /mnt
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mount /dev/vda1 /mnt
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# The initrd expects these directories to exist.
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mkdir /mnt/dev /mnt/proc /mnt/sys
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mount --bind /proc /mnt/proc
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mount --bind /dev /mnt/dev
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mount --bind /sys /mnt/sys
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# Copy all paths in the closure to the filesystem.
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storePaths=$(perl ${pkgs.pathsFromGraph} /tmp/xchg/closure)
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mkdir -p /mnt/nix/store
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echo "copying everything (will take a while)..."
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cp -prd $storePaths /mnt/nix/store/
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# Register the paths in the Nix database.
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printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \
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chroot /mnt ${config.nix.package}/bin/nix-store --load-db --option build-users-group ""
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# Create the system profile to allow nixos-rebuild to work.
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chroot /mnt ${config.nix.package}/bin/nix-env \
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-p /nix/var/nix/profiles/system --set ${config.system.build.toplevel} \
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--option build-users-group ""
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# `nixos-rebuild' requires an /etc/NIXOS.
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mkdir -p /mnt/etc
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touch /mnt/etc/NIXOS
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# `switch-to-configuration' requires a /bin/sh
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mkdir -p /mnt/bin
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ln -s ${config.system.build.binsh}/bin/sh /mnt/bin/sh
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# Install a configuration.nix.
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mkdir -p /mnt/etc/nixos /mnt/boot/grub
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cp ${./brightbox-config.nix} /mnt/etc/nixos/configuration.nix
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# Generate the GRUB menu.
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ln -s vda /dev/sda
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chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
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umount /mnt/proc /mnt/dev /mnt/sys
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umount /mnt
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''
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);
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fileSystems."/".label = "nixos";
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# Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd.
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boot.loader.grub.device = "/dev/vda";
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boot.loader.grub.timeout = 0;
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# Don't put old configurations in the GRUB menu. The user has no
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# way to select them anyway.
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boot.loader.grub.configurationLimit = 0;
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# Allow root logins only using the SSH key that the user specified
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# at instance creation time.
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services.openssh.enable = true;
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services.openssh.permitRootLogin = "without-password";
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# Force getting the hostname from Google Compute.
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networking.hostName = mkDefault "";
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# Always include cryptsetup so that NixOps can use it.
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environment.systemPackages = [ pkgs.cryptsetup ];
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systemd.services."fetch-ec2-data" =
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{ description = "Fetch EC2 Data";
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wantedBy = [ "multi-user.target" "sshd.service" ];
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before = [ "sshd.service" ];
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wants = [ "ip-up.target" ];
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after = [ "ip-up.target" ];
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path = [ pkgs.wget pkgs.iproute ];
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script =
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''
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wget="wget -q --retry-connrefused -O -"
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${optionalString (config.networking.hostName == "") ''
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echo "setting host name..."
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${pkgs.nettools}/bin/hostname $($wget http://169.254.169.254/latest/meta-data/hostname)
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''}
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# Don't download the SSH key if it has already been injected
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# into the image (a Nova feature).
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if ! [ -e /root/.ssh/authorized_keys ]; then
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echo "obtaining SSH key..."
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mkdir -m 0700 -p /root/.ssh
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$wget http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key > /root/key.pub
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if [ $? -eq 0 -a -e /root/key.pub ]; then
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if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then
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cat /root/key.pub >> /root/.ssh/authorized_keys
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echo "new key added to authorized_keys"
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fi
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chmod 600 /root/.ssh/authorized_keys
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rm -f /root/key.pub
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fi
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fi
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# Extract the intended SSH host key for this machine from
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# the supplied user data, if available. Otherwise sshd will
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# generate one normally.
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$wget http://169.254.169.254/2011-01-01/user-data > /root/user-data || true
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key="$(sed 's/|/\n/g; s/SSH_HOST_DSA_KEY://; t; d' /root/user-data)"
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key_pub="$(sed 's/SSH_HOST_DSA_KEY_PUB://; t; d' /root/user-data)"
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if [ -n "$key" -a -n "$key_pub" -a ! -e /etc/ssh/ssh_host_dsa_key ]; then
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mkdir -m 0755 -p /etc/ssh
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(umask 077; echo "$key" > /etc/ssh/ssh_host_dsa_key)
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echo "$key_pub" > /etc/ssh/ssh_host_dsa_key.pub
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fi
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'';
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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};
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}
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