commit 3da94435c07d09c792d56d1a4547668422d7c539 · pyrox.dev/nixpkgs

+148 -129
nixos/modules/virtualisation/amazon-image.nix
···

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       { config, lib, pkgs, ... }:

     

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       with lib;

     

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       -
       

     

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       +
       let

     

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         cfg = config.ec2;

     

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       in

     

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       {

     

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         imports = [ ../profiles/headless.nix ./ec2-data.nix ];

     

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         system.build.amazonImage =

     

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           pkgs.vmTools.runInLinuxVM (

     

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             pkgs.runCommand "amazon-image"

     

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               { preVM =

     

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                   ''

     

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                     mkdir $out

     

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                     diskImage=$out/nixos.img

     

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                     ${pkgs.vmTools.qemu}/bin/qemu-img create -f raw $diskImage "4G"

     

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                     mv closure xchg/

     

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                   '';

     

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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 an empty filesystem and mount it.

     

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                 ${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda

     

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                 ${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda

     

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                 mkdir /mnt

     

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                 mount /dev/vda /mnt

     

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         options = {

     

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           ec2 = {

     

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             hvm = mkOption {

     

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               default = false;

     

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               description = ''

     

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                 Whether the EC2 instance is a HVM instance.

     

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               '';

     

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             };

     

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           };

     

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         };

     

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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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         config = {

     

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           system.build.amazonImage =

     

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             pkgs.vmTools.runInLinuxVM (

     

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               pkgs.runCommand "amazon-image"

     

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                 { preVM =

     

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                     ''

     

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                       mkdir $out

     

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                       diskImage=$out/nixos.img

     

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                       ${pkgs.vmTools.qemu}/bin/qemu-img create -f raw $diskImage "4G"

     

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                       mv closure xchg/

     

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                     '';

     

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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 an empty filesystem and mount it.

     

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                   ${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda

     

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                   ${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda

     

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                   mkdir /mnt

     

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                   mount /dev/vda /mnt

     

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       +
       

     

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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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       +
       

     

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                   mount -o bind /proc /mnt/proc

     

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                 mount -o bind /proc /mnt/proc

     

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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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                 # 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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                 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

     

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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

     

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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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                 # 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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                   # `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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                 # `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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                 # `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

     

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                   cp ${./amazon-config.nix} /mnt/etc/nixos/configuration.nix

     

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                 # Install a configuration.nix.

     

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                 mkdir -p /mnt/etc/nixos

     

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                 cp ${./amazon-config.nix} /mnt/etc/nixos/configuration.nix

     

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                   # Generate the GRUB menu.

     

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                   chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot

     

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                 # Generate the GRUB menu.

     

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                 chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot

     

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                   umount /mnt/proc

     

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                   umount /mnt

     

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                 ''

     

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             );

     

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                 umount /mnt/proc

     

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                 umount /mnt

     

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               ''

     

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           );

     

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           fileSystems."/".device = "/dev/disk/by-label/nixos";

     

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         fileSystems."/".device = "/dev/disk/by-label/nixos";

     

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           boot.initrd.kernelModules = [ "xen-blkfront" ];

     

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           boot.kernelModules = [ "xen-netfront" ];

     

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         boot.initrd.kernelModules = [ "xen-blkfront" ];

     

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         boot.kernelModules = [ "xen-netfront" ];

     

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         boot.kernelParams = [ "console=ttyS0" ];

     

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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.version = 1;

     

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           boot.loader.grub.device = if cfg.hvm then "/dev/xvda" else "nodev";

     

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           boot.loader.grub.timeout = 0;

     

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           boot.loader.grub.extraPerEntryConfig = "root (hd0${lib.optionalString cfg.hvm ",0"})";

     

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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.version = 1;

     

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         boot.loader.grub.device = "nodev";

     

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         boot.loader.grub.timeout = 0;

     

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         boot.loader.grub.extraPerEntryConfig = "root (hd0)";

     

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           boot.initrd.postDeviceCommands =

     

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             ''

     

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               # Force udev to exit to prevent random "Device or resource busy

     

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               # while trying to open /dev/xvda" errors from fsck.

     

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               udevadm control --exit || true

     

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               kill -9 -1

     

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             '';

     

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         boot.initrd.postDeviceCommands =

     

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           ''

     

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             # Force udev to exit to prevent random "Device or resource busy

     

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             # while trying to open /dev/xvda" errors from fsck.

     

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             udevadm control --exit || true

     

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             kill -9 -1

     

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           '';

     

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           # Mount all formatted ephemeral disks and activate all swap devices.

     

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           # We cannot do this with the ‘fileSystems’ and ‘swapDevices’ options

     

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           # because the set of devices is dependent on the instance type

     

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           # (e.g. "m1.large" has one ephemeral filesystem and one swap device,

     

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           # while "m1.large" has two ephemeral filesystems and no swap

     

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           # devices).  Also, put /tmp and /var on /disk0, since it has a lot

     

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           # more space than the root device.  Similarly, "move" /nix to /disk0

     

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           # by layering a unionfs-fuse mount on top of it so we have a lot more space for

     

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           # Nix operations.

     

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           boot.initrd.postMountCommands =

     

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             ''

     

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               diskNr=0

     

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               diskForUnionfs=

     

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               for device in /dev/xvd[abcde]*; do

     

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                   if [ "$device" = /dev/xvda -o "$device" = /dev/xvda1 ]; then continue; fi

     

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                   fsType=$(blkid -o value -s TYPE "$device" || true)

     

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                   if [ "$fsType" = swap ]; then

     

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                       echo "activating swap device $device..."

     

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                       swapon "$device" || true

     

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                   elif [ "$fsType" = ext3 ]; then

     

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                       mp="/disk$diskNr"

     

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                       diskNr=$((diskNr + 1))

     

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                       echo "mounting $device on $mp..."

     

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                       if mountFS "$device" "$mp" "" ext3; then

     

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                           if [ -z "$diskForUnionfs" ]; then diskForUnionfs="$mp"; fi

     

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                       fi

     

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                   else

     

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                       echo "skipping unknown device type $device"

     

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                   fi

     

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               done

     

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         # Mount all formatted ephemeral disks and activate all swap devices.

     

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         # We cannot do this with the ‘fileSystems’ and ‘swapDevices’ options

     

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         # because the set of devices is dependent on the instance type

     

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         # (e.g. "m1.large" has one ephemeral filesystem and one swap device,

     

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         # while "m1.large" has two ephemeral filesystems and no swap

     

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         # devices).  Also, put /tmp and /var on /disk0, since it has a lot

     

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         # more space than the root device.  Similarly, "move" /nix to /disk0

     

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         # by layering a unionfs-fuse mount on top of it so we have a lot more space for

     

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         # Nix operations.

     

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         boot.initrd.postMountCommands =

     

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           ''

     

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             diskNr=0

     

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             diskForUnionfs=

     

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             for device in /dev/xvd[abcde]*; do

     

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                 if [ "$device" = /dev/xvda -o "$device" = /dev/xvda1 ]; then continue; fi

     

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                 fsType=$(blkid -o value -s TYPE "$device" || true)

     

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                 if [ "$fsType" = swap ]; then

     

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                     echo "activating swap device $device..."

     

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                     swapon "$device" || true

     

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                 elif [ "$fsType" = ext3 ]; then

     

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                     mp="/disk$diskNr"

     

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                     diskNr=$((diskNr + 1))

     

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                     echo "mounting $device on $mp..."

     

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                     if mountFS "$device" "$mp" "" ext3; then

     

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                         if [ -z "$diskForUnionfs" ]; then diskForUnionfs="$mp"; fi

     

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                     fi

     

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                 else

     

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                     echo "skipping unknown device type $device"

     

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                 fi

     

       118
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             done

     

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       +
               if [ -n "$diskForUnionfs" ]; then

     

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                   mkdir -m 755 -p $targetRoot/$diskForUnionfs/root

     

       119
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       120
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             if [ -n "$diskForUnionfs" ]; then

     

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                 mkdir -m 755 -p $targetRoot/$diskForUnionfs/root

     

       136
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       +
                   mkdir -m 1777 -p $targetRoot/$diskForUnionfs/root/tmp $targetRoot/tmp

     

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                   mount --bind $targetRoot/$diskForUnionfs/root/tmp $targetRoot/tmp

     

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                 mkdir -m 1777 -p $targetRoot/$diskForUnionfs/root/tmp $targetRoot/tmp

     

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                 mount --bind $targetRoot/$diskForUnionfs/root/tmp $targetRoot/tmp

     

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                   if [ ! -e $targetRoot/.ebs ]; then

     

       140
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                       mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/var $targetRoot/var

     

       141
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                       mount --bind $targetRoot/$diskForUnionfs/root/var $targetRoot/var

     

       125
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       126
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                 if [ ! -e $targetRoot/.ebs ]; then

     

       127
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                     mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/var $targetRoot/var

     

       128
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       -
                     mount --bind $targetRoot/$diskForUnionfs/root/var $targetRoot/var

     

       143
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       +
                       mkdir -p /unionfs-chroot/ro-nix

     

       144
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       +
                       mount --rbind $targetRoot/nix /unionfs-chroot/ro-nix

     

       129
       145
        
       

     

       130
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                     mkdir -p /unionfs-chroot/ro-nix

     

       131
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       -
                     mount --rbind $targetRoot/nix /unionfs-chroot/ro-nix

     

       146
       146
       +
                       mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/nix

     

       147
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       +
                       mkdir -p /unionfs-chroot/rw-nix

     

       148
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       +
                       mount --rbind $targetRoot/$diskForUnionfs/root/nix /unionfs-chroot/rw-nix

     

       132
       149
        
       

     

       133
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       -
                     mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/nix

     

       134
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                     mkdir -p /unionfs-chroot/rw-nix

     

       135
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       -
                     mount --rbind $targetRoot/$diskForUnionfs/root/nix /unionfs-chroot/rw-nix

     

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       +
                       unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot,max_files=32768 /rw-nix=RW:/ro-nix=RO $targetRoot/nix

     

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       +
                   fi

     

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       +
               fi

     

       153
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             '';

     

       136
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       -
                     unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot,max_files=32768 /rw-nix=RW:/ro-nix=RO $targetRoot/nix

     

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       -
                 fi

     

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             fi

     

       140
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       -
           '';

     

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       +
           boot.initrd.extraUtilsCommands =

     

       156
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       +
             ''

     

       157
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       +
               # We need swapon in the initrd.

     

       158
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       +
               cp ${pkgs.utillinux}/sbin/swapon $out/bin

     

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       +
             '';

     

       141
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       142
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       -
         boot.initrd.extraUtilsCommands =

     

       143
       143
       -
           ''

     

       144
       144
       -
             # We need swapon in the initrd.

     

       145
       145
       -
             cp ${pkgs.utillinux}/sbin/swapon $out/bin

     

       146
       146
       -
           '';

     

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       161
       +
           # Don't put old configurations in the GRUB menu.  The user has no

     

       162
       162
       +
           # way to select them anyway.

     

       163
       163
       +
           boot.loader.grub.configurationLimit = 0;

     

       147
       164
        
       

     

       148
       148
       -
         # Don't put old configurations in the GRUB menu.  The user has no

     

       149
       149
       -
         # way to select them anyway.

     

       150
       150
       -
         boot.loader.grub.configurationLimit = 0;

     

       165
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       +
           # Allow root logins only using the SSH key that the user specified

     

       166
       166
       +
           # at instance creation time.

     

       167
       167
       +
           services.openssh.enable = true;

     

       168
       168
       +
           services.openssh.permitRootLogin = "without-password";

     

       151
       169
        
       

     

       152
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       -
         # Allow root logins only using the SSH key that the user specified

     

       153
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         # at instance creation time.

     

       154
       154
       -
         services.openssh.enable = true;

     

       155
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       -
         services.openssh.permitRootLogin = "without-password";

     

       170
       170
       +
           # Force getting the hostname from EC2.

     

       171
       171
       +
           networking.hostName = mkDefault "";

     

       156
       172
        
       

     

       157
       157
       -
         # Force getting the hostname from EC2.

     

       158
       158
       -
         networking.hostName = mkDefault "";

     

       173
       173
       +
           # Always include cryptsetup so that Charon can use it.

     

       174
       174
       +
           environment.systemPackages = [ pkgs.cryptsetup ];

     

       159
       175
        
       

     

       160
       160
       -
         # Always include cryptsetup so that Charon can use it.

     

       161
       161
       -
         environment.systemPackages = [ pkgs.cryptsetup ];

     

       176
       176
       +
           boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];

     

       162
       177
        
       

     

       163
       163
       -
         boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];

     

       178
       178
       +
           # Prevent logging in as root without a password.  This doesn't really matter,

     

       179
       179
       +
           # since the only PAM services that allow logging in with a null

     

       180
       180
       +
           # password are local ones that are inaccessible on EC2 machines.

     

       181
       181
       +
           security.initialRootPassword = mkDefault "!";

     

       182
       182
       +
         };

     

       164
       183
        
       }