nixpkgs/modules/virtualisation/nova-image.nix
Eelco Dolstra 545431003b * Create some virtual consoles in Nova VMs because it provides VNC
access.

svn path=/nixos/trunk/; revision=27483
2011-06-16 14:15:37 +00:00

116 lines
3.8 KiB
Nix

{ config, pkgs, ... }:
with pkgs.lib;
{
require = [ ../profiles/qemu-guest.nix ./ec2-data.nix ];
system.build.novaImage =
pkgs.vmTools.runInLinuxVM (
pkgs.runCommand "nova-image"
{ preVM =
''
mkdir $out
diskImage=$out/image
${pkgs.vmTools.kvm}/bin/qemu-img create -f raw $diskImage "4G"
'';
buildInputs = [ pkgs.utillinux pkgs.perl ];
exportReferencesGraph =
[ "closure" config.system.build.toplevel ];
}
''
# Create a single / partition.
${pkgs.parted}/sbin/parted /dev/vda mklabel msdos
${pkgs.parted}/sbin/parted /dev/vda -- mkpart primary ext2 1M -1s
. /sys/class/block/vda1/uevent
mknod /dev/vda1 b $MAJOR $MINOR
# Create an empty filesystem and mount it.
${pkgs.e2fsprogs}/sbin/mkfs.ext3 -L nixos /dev/vda1
${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1
mkdir /mnt
mount /dev/vda1 /mnt
# The initrd expects these directories to exist.
mkdir /mnt/dev /mnt/proc /mnt/sys
mount --bind /proc /mnt/proc
mount --bind /dev /mnt/dev
mount --bind /sys /mnt/sys
# Copy all paths in the closure to the filesystem.
storePaths=$(perl ${pkgs.pathsFromGraph} $ORIG_TMPDIR/closure)
mkdir -p /mnt/nix/store
${pkgs.rsync}/bin/rsync -av $storePaths /mnt/nix/store/
# Register the paths in the Nix database.
printRegistration=1 perl ${pkgs.pathsFromGraph} $ORIG_TMPDIR/closure | \
chroot /mnt ${config.environment.nix}/bin/nix-store --load-db
# Create the system profile to allow nixos-rebuild to work.
chroot /mnt ${config.environment.nix}/bin/nix-env \
-p /nix/var/nix/profiles/system --set ${config.system.build.toplevel}
# `nixos-rebuild' requires an /etc/NIXOS.
mkdir -p /mnt/etc
touch /mnt/etc/NIXOS
# Install a configuration.nix.
mkdir -p /mnt/etc/nixos
cp ${./nova-config.nix} /mnt/etc/nixos/configuration.nix
# Generate the GRUB menu.
chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
umount /mnt/proc /mnt/dev /mnt/sys
umount /mnt
''
);
fileSystems =
[ { mountPoint = "/";
device = "/dev/disk/by-label/nixos";
}
];
boot.kernelParams = [ "console=ttyS0" ];
boot.initrd.kernelModules = [ "aufs" ];
boot.extraModulePackages = [ config.boot.kernelPackages.aufs2 ];
boot.loader.grub.version = 2;
boot.loader.grub.device = "/dev/vda";
boot.loader.grub.timeout = 0;
# Put /tmp and /var on /ephemeral0, which has a lot more space.
# Unfortunately we can't do this with the `fileSystems' option
# because it has no support for creating the source of a bind
# mount. Also, "move" /nix to /ephemeral0 by layering an AUFS
# on top of it so we have a lot more space for Nix operations.
/*
boot.initrd.postMountCommands =
''
mkdir -m 1777 -p $targetRoot/ephemeral0/tmp
mkdir -m 1777 -p $targetRoot/tmp
mount --bind $targetRoot/ephemeral0/tmp $targetRoot/tmp
mkdir -m 755 -p $targetRoot/ephemeral0/var
mkdir -m 755 -p $targetRoot/var
mount --bind $targetRoot/ephemeral0/var $targetRoot/var
mkdir -m 755 -p $targetRoot/ephemeral0/nix
mount -t aufs -o dirs=$targetRoot/ephemeral0/nix=rw:$targetRoot/nix=rr none $targetRoot/nix
'';
*/
# Since Nova allows VNC access to instances, it's nice to start to
# start a few virtual consoles.
services.mingetty.ttys = [ "tty1" "tty2" ];
# 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";
}