140 lines
4.8 KiB
Nix
140 lines
4.8 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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{
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require = [ ../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.kvm}/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.ext3 -L nixos /dev/vda
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${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda
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mkdir /mnt
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mount /dev/vda /mnt
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# The initrd expects these directories to exist.
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mkdir /mnt/dev /mnt/proc /mnt/sys
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mount -o bind /proc /mnt/proc
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# Copy all paths in the closure to the filesystem.
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storePaths=$(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.environment.nix}/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.environment.nix}/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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# 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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umount /mnt/proc
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umount /mnt
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''
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);
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fileSystems =
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[ { mountPoint = "/";
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device = "/dev/disk/by-label/nixos";
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}
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];
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boot.initrd.kernelModules = [ "xen-blkfront" "aufs" ];
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boot.kernelModules = [ "xen-netfront" ];
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boot.extraModulePackages = [ config.boot.kernelPackages.aufs ];
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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 = "nodev";
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boot.loader.grub.timeout = 0;
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boot.loader.grub.extraPerEntryConfig = "root (hd0)";
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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 an AUFS 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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diskForAufs=
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for device in /dev/xvd*; 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" "$mp" "" ext3; then
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if [ -z "$diskForAufs" ]; then diskForAufs="$mp"; fi
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fi
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else
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echo "skipping unknown device type $device"
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fi
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done
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if [ -n "$diskForAufs" ]; then
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mkdir -m 755 -p $targetRoot/$diskForAufs/root
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mkdir -m 1777 -p $targetRoot/$diskForAufs/root/tmp $targetRoot/tmp
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mount --bind $targetRoot/$diskForAufs/root/tmp $targetRoot/tmp
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mkdir -m 755 -p $targetRoot/$diskForAufs/root/var $targetRoot/var
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mount --bind $targetRoot/$diskForAufs/root/var $targetRoot/var
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mkdir -m 755 -p $targetRoot/$diskForAufs/root/nix
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mount -t aufs -o dirs=$targetRoot/$diskForAufs/root/nix=rw:$targetRoot/nix=rr none $targetRoot/nix
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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 ${pkgs.utillinux}/sbin/swapon $out/bin
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'';
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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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}
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