118 lines
4 KiB
Nix
118 lines
4 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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{
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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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qemu-img create -f raw $diskImage "4G"
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'';
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buildInputs = [ pkgs.utillinux pkgs.perl ];
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exportReferencesGraph =
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[ "closure" config.system.build.toplevel ];
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}
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''
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# Create an empty filesysten and mount it.
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${pkgs.e2fsprogs}/sbin/mkfs.ext3 -L nixos /dev/vda
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${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda
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mkdir /mnt
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mount /dev/vda /mnt
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# The initrd expects these directories to exist.
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mkdir /mnt/dev /mnt/proc /mnt/sys
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# Copy all paths in the closure to the filesystem.
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storePaths=$(perl ${pkgs.pathsFromGraph} $ORIG_TMPDIR/closure)
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mkdir -p /mnt/nix/store
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cp -prvd $storePaths /mnt/nix/store/
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# Register the paths in the Nix database.
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printRegistration=1 perl ${pkgs.pathsFromGraph} $ORIG_TMPDIR/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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# Amazon assumes that there is a /sbin/init, so create one.
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# Note that simply creating /sbin/init as a symlink breaks
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# some EC2 initrds (like Ubuntu's) because they do a "test
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# -x $mountPoint/sbin/init".
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mkdir -p /mnt/sbin
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echo "#! /nix/var/nix/profiles/system/init" > /mnt/sbin/init
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chmod +x /mnt/sbin/init
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umount /mnt
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''
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);
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# On EC2 we don't get to supply our own kernel, so we can't load any
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# modules. However, dhclient fails if the ipv6 module isn't loaded,
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# unless it's compiled without IPv6 support. So do that.
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nixpkgs.config.packageOverrides = pkgsOld:
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{ dhcp = pkgs.lib.overrideDerivation pkgsOld.dhcp (oldAttrs:
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{ configureFlags = "--disable-dhcpv6";
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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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{ mountPoint = "/data";
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device = "/dev/sda2";
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autocreate = true;
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}
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];
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swapDevices =
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[ { device = "/dev/sda3"; } ];
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# There are no virtual consoles.
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services.mingetty.ttys = [ ];
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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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# Obtain the SSH key and host name at startup time.
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jobs.fetchEC2Data =
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{ name = "fetch-ec2-data";
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startOn = "ip-up";
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task = true;
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script =
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''
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echo "obtaining SSH key..."
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mkdir -p /root/.ssh
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${pkgs.curl}/bin/curl --retry 3 --retry-delay 0 --fail \
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-o /root/key.pub \
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http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
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if [ $? -eq 0 -a -e /root/key.pub ]; then
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if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then
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cat /root/key.pub >> /root/.ssh/authorized_keys
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echo "new key added to authorized_keys"
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fi
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chmod 600 /root/.ssh/authorized_keys
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rm -f /root/key.pub
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fi
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echo "setting host name..."
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${pkgs.nettools}/bin/hostname $(${pkgs.curl}/bin/curl http://169.254.169.254/1.0/meta-data/hostname)
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'';
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};
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}
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