nixos/tests/common/ec2.nix

   1 { pkgs, makeTest }:
   2
   3 with pkgs.lib;
   4
   5 {
   6   makeEc2Test = { name, image, userData, script, hostname ? "ec2-instance", sshPublicKey ? null, meta ? {} }:
   7     let
   8       metaData = pkgs.stdenv.mkDerivation {
   9         name = "metadata";
  10         buildCommand = ''
  11           mkdir -p $out/1.0/meta-data
  12           ln -s ${pkgs.writeText "userData" userData} $out/1.0/user-data
  13           echo "${hostname}" > $out/1.0/meta-data/hostname
  14           echo "(unknown)" > $out/1.0/meta-data/ami-manifest-path
  15         '' + optionalString (sshPublicKey != null) ''
  16           mkdir -p $out/1.0/meta-data/public-keys/0
  17           ln -s ${pkgs.writeText "sshPublicKey" sshPublicKey} $out/1.0/meta-data/public-keys/0/openssh-key
  18         '';
  19       };
  20     in makeTest {
  21       name = "ec2-" + name;
  22       nodes = {};
  23       testScript = ''
  24         import os
  25         import subprocess
  26         import tempfile
  27
  28         image_dir = os.path.join(
  29             os.environ.get("TMPDIR", tempfile.gettempdir()), "tmp", "vm-state-machine"
  30         )
  31         os.makedirs(image_dir, mode=0o700, exist_ok=True)
  32         disk_image = os.path.join(image_dir, "machine.qcow2")
  33         subprocess.check_call(
  34             [
  35                 "qemu-img",
  36                 "create",
  37                 "-f",
  38                 "qcow2",
  39                 "-o",
  40                 "backing_file=${image}",
  41                 disk_image,
  42             ]
  43         )
  44         subprocess.check_call(["qemu-img", "resize", disk_image, "10G"])
  45
  46         # Note: we use net=169.0.0.0/8 rather than
  47         # net=169.254.0.0/16 to prevent dhcpcd from getting horribly
  48         # confused. (It would get a DHCP lease in the 169.254.*
  49         # range, which it would then configure and prompty delete
  50         # again when it deletes link-local addresses.) Ideally we'd
  51         # turn off the DHCP server, but qemu does not have an option
  52         # to do that.
  53         start_command = (
  54             "qemu-kvm -m 1024"
  55             + " -device virtio-net-pci,netdev=vlan0"
  56             + " -netdev 'user,id=vlan0,net=169.0.0.0/8,guestfwd=tcp:169.254.169.254:80-cmd:${pkgs.micro-httpd}/bin/micro_httpd ${metaData}'"
  57             + f" -drive file={disk_image},if=virtio,werror=report"
  58             + " $QEMU_OPTS"
  59         )
  60
  61         machine = create_machine({"startCommand": start_command})
  62       '' + script;
  63
  64       inherit meta;
  65     };
  66 }