143 lines
4.9 KiB
Nix
143 lines
4.9 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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${pkgs.vmTools.kvm}/bin/qemu-img create -f raw $diskImage "4G"
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'';
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buildInputs = [ pkgs.utillinux pkgs.perl ];
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exportReferencesGraph =
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[ "closure" config.system.build.toplevel ];
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}
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''
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# Create an empty filesystem and mount it.
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${pkgs.e2fsprogs}/sbin/mkfs.ext3 -L nixos /dev/vda
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${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda
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mkdir /mnt
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mount /dev/vda /mnt
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# The initrd expects these directories to exist.
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mkdir /mnt/dev /mnt/proc /mnt/sys
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# Copy all paths in the closure to the filesystem.
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storePaths=$(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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# 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
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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 = "/ephemeral0";
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device = "/dev/xvdc";
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neededForBoot = true;
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}
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];
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swapDevices =
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[ { device = "/dev/xvdb"; } ];
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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.aufs2 ];
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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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# Put /tmp and /var on /ephemeral0, which has a lot more space.
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# Unfortunately we can't do this with the `fileSystems' option
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# because it has no support for creating the source of a bind
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# mount. Also, "move" /nix to /ephemeral0 by layering an AUFS
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# on top of it so we have a lot more space for Nix operations.
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boot.initrd.postMountCommands =
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''
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mkdir -m 1777 -p $targetRoot/ephemeral0/tmp
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mkdir -m 1777 -p $targetRoot/tmp
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mount --bind $targetRoot/ephemeral0/tmp $targetRoot/tmp
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mkdir -m 755 -p $targetRoot/ephemeral0/var
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mkdir -m 755 -p $targetRoot/var
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mount --bind $targetRoot/ephemeral0/var $targetRoot/var
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mkdir -m 755 -p $targetRoot/ephemeral0/nix
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mount -t aufs -o dirs=$targetRoot/ephemeral0/nix=rw:$targetRoot/nix=rr none $targetRoot/nix
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'';
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# There are no virtual consoles.
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services.mingetty.ttys = [ ];
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# Allow root logins only using the SSH key that the user specified
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# at instance creation time.
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services.openssh.enable = true;
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services.openssh.permitRootLogin = "without-password";
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# Obtain the SSH key and host name at startup time.
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jobs.fetchEC2Data =
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{ name = "fetch-ec2-data";
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startOn = "ip-up";
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task = true;
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script =
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''
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echo "obtaining SSH key..."
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mkdir -p /root/.ssh
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${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 [ $? -eq 0 -a -e /root/key.pub ]; then
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if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then
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cat /root/key.pub >> /root/.ssh/authorized_keys
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echo "new key added to authorized_keys"
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fi
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chmod 600 /root/.ssh/authorized_keys
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rm -f /root/key.pub
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fi
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# Print the host public key on the console so that the user
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# can obtain it securely by parsing the output of
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# ec2-get-console-output.
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echo "-----BEGIN SSH HOST KEY FINGERPRINTS-----" > /dev/console
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${pkgs.openssh}/bin/ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub > /dev/console
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echo "-----END SSH HOST KEY FINGERPRINTS-----" > /dev/console
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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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