200 lines
7.4 KiB
Nix
200 lines
7.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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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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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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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 $diskImage "8G"
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mv closure xchg/
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'';
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buildInputs = [ pkgs.utillinux pkgs.perl ];
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exportReferencesGraph =
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[ "closure" config.system.build.toplevel ];
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}
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''
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${if cfg.hvm then ''
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# Create a single / partition.
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${pkgs.parted}/sbin/parted /dev/vda mklabel msdos
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${pkgs.parted}/sbin/parted /dev/vda -- mkpart primary ext2 1M -1s
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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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${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1
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mkdir /mnt
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mount /dev/vda1 /mnt
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'' else ''
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# Create an empty filesystem and mount it.
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${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda
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${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda
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mkdir /mnt
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mount /dev/vda /mnt
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''}
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# The initrd expects these directories to exist.
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mkdir /mnt/dev /mnt/proc /mnt/sys
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mount -o bind /proc /mnt/proc
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mount -o bind /dev /mnt/dev
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mount -o bind /sys /mnt/sys
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# Copy all paths in the closure to the filesystem.
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storePaths=$(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 --option build-users-group "" \
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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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# `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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# Generate the GRUB menu.
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ln -s vda /dev/xvda
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chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
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umount /mnt/proc /mnt/dev /mnt/sys
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umount /mnt
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''
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);
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fileSystems."/".device = "/dev/disk/by-label/nixos";
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boot.initrd.kernelModules = [ "xen-blkfront" ];
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boot.kernelModules = [ "xen-netfront" ];
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# Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd.
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boot.loader.grub.version = if cfg.hvm then 2 else 1;
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boot.loader.grub.device = if cfg.hvm then "/dev/xvda" else "nodev";
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boot.loader.grub.timeout = 0;
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boot.loader.grub.extraPerEntryConfig = "root (hd0${lib.optionalString cfg.hvm ",0"})";
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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 $device"
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fi
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done
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if [ -n "$diskForUnionfs" ]; then
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mkdir -m 755 -p $targetRoot/$diskForUnionfs/root
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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
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mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/var $targetRoot/var
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mount --bind $targetRoot/$diskForUnionfs/root/var $targetRoot/var
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mkdir -p /unionfs-chroot/ro-nix
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mount --rbind $targetRoot/nix /unionfs-chroot/ro-nix
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mkdir -m 755 -p $targetRoot/$diskForUnionfs/root/nix
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mkdir -p /unionfs-chroot/rw-nix
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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
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'';
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boot.initrd.extraUtilsCommands =
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''
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# We need swapon in the initrd.
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cp --remove-destination ${pkgs.utillinux}/sbin/swapon $out/bin
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'';
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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 EC2.
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networking.hostName = mkDefault "";
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# Always include cryptsetup so that Charon can use it.
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environment.systemPackages = [ pkgs.cryptsetup ];
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boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];
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# Prevent logging in as root without a password. This doesn't really matter,
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# since the only PAM services that allow logging in with a null
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# password are local ones that are inaccessible on EC2 machines.
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security.initialRootPassword = mkDefault "!";
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};
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}
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