···
{ config, lib, pkgs, ... }:
imports = [ ../profiles/headless.nix ./ec2-data.nix ];
+
Whether the EC2 instance is a HVM instance.
+
system.build.amazonImage =
+
pkgs.vmTools.runInLinuxVM (
+
pkgs.runCommand "amazon-image"
+
diskImage=$out/nixos.img
+
${pkgs.vmTools.qemu}/bin/qemu-img create -f raw $diskImage "4G"
+
buildInputs = [ pkgs.utillinux pkgs.perl ];
+
exportReferencesGraph =
+
[ "closure" config.system.build.toplevel ];
+
# Create an empty filesystem and mount it.
+
${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda
+
${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda
+
# The initrd expects these directories to exist.
+
mkdir /mnt/dev /mnt/proc /mnt/sys
+
mount -o bind /proc /mnt/proc
+
# Copy all paths in the closure to the filesystem.
+
storePaths=$(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.
+
# `switch-to-configuration' requires a /bin/sh
+
ln -s ${config.system.build.binsh}/bin/sh /mnt/bin/sh
+
# Install a configuration.nix.
+
mkdir -p /mnt/etc/nixos
+
cp ${./amazon-config.nix} /mnt/etc/nixos/configuration.nix
+
# Generate the GRUB menu.
+
chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
+
fileSystems."/".device = "/dev/disk/by-label/nixos";
+
boot.initrd.kernelModules = [ "xen-blkfront" ];
+
boot.kernelModules = [ "xen-netfront" ];
+
# Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd.
+
boot.loader.grub.version = 1;
+
boot.loader.grub.device = if cfg.hvm then "/dev/xvda" else "nodev";
+
boot.loader.grub.timeout = 0;
+
boot.loader.grub.extraPerEntryConfig = "root (hd0${lib.optionalString cfg.hvm ",0"})";
+
boot.initrd.postDeviceCommands =
+
# Force udev to exit to prevent random "Device or resource busy
+
# while trying to open /dev/xvda" errors from fsck.
+
udevadm control --exit || true
+
# Mount all formatted ephemeral disks and activate all swap devices.
+
# We cannot do this with the ‘fileSystems’ and ‘swapDevices’ options
+
# because the set of devices is dependent on the instance type
+
# (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
+
# devices). Also, put /tmp and /var on /disk0, since it has a lot
+
# more space than the root device. Similarly, "move" /nix to /disk0
+
# by layering a unionfs-fuse mount on top of it so we have a lot more space for
+
boot.initrd.postMountCommands =
+
for device in /dev/xvd[abcde]*; do
+
if [ "$device" = /dev/xvda -o "$device" = /dev/xvda1 ]; then continue; fi
+
fsType=$(blkid -o value -s TYPE "$device" || true)
+
if [ "$fsType" = swap ]; then
+
echo "activating swap device $device..."
+
swapon "$device" || true
+
elif [ "$fsType" = ext3 ]; then
+
echo "mounting $device on $mp..."
+
if mountFS "$device" "$mp" "" ext3; then
+
if [ -z "$diskForUnionfs" ]; then diskForUnionfs="$mp"; fi
+
echo "skipping unknown device type $device"
+
if [ -n "$diskForUnionfs" ]; then
+
mkdir -m 755 -p $targetRoot/$diskForUnionfs/root
+
mkdir -m 1777 -p $targetRoot/$diskForUnionfs/root/tmp $targetRoot/tmp
+
mount --bind $targetRoot/$diskForUnionfs/root/tmp $targetRoot/tmp
+
if [ ! -e $targetRoot/.ebs ]; then
+
mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/var $targetRoot/var
+
mount --bind $targetRoot/$diskForUnionfs/root/var $targetRoot/var
+
mkdir -p /unionfs-chroot/ro-nix
+
mount --rbind $targetRoot/nix /unionfs-chroot/ro-nix
+
mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/nix
+
mkdir -p /unionfs-chroot/rw-nix
+
mount --rbind $targetRoot/$diskForUnionfs/root/nix /unionfs-chroot/rw-nix
+
unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot,max_files=32768 /rw-nix=RW:/ro-nix=RO $targetRoot/nix
+
boot.initrd.extraUtilsCommands =
+
# We need swapon in the initrd.
+
cp ${pkgs.utillinux}/sbin/swapon $out/bin
+
# 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 EC2.
+
networking.hostName = mkDefault "";
+
# Always include cryptsetup so that Charon can use it.
+
environment.systemPackages = [ pkgs.cryptsetup ];
+
boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];
+
# 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 EC2 machines.
+
security.initialRootPassword = mkDefault "!";
pyrox.dev