nixpkgs/nixos/tests/common/ec2.nix
Leon Barrett a711e445cc nixos/tests/ec2: Fix test tooling
This change fixes two problems with the qemu testing code:
1. Previously, the qemu-img command was missing a disk image format
   argument.
2. Previously, if a test assertion failed, the test hung because the VM
   was not torn down.
2023-04-16 09:54:10 -07:00

74 lines
2.5 KiB
Nix

{ pkgs, makeTest }:
with pkgs.lib;
{
makeEc2Test = { name, image, userData, script, hostname ? "ec2-instance", sshPublicKey ? null, meta ? {} }:
let
metaData = pkgs.stdenv.mkDerivation {
name = "metadata";
buildCommand = ''
mkdir -p $out/1.0/meta-data
ln -s ${pkgs.writeText "userData" userData} $out/1.0/user-data
echo "${hostname}" > $out/1.0/meta-data/hostname
echo "(unknown)" > $out/1.0/meta-data/ami-manifest-path
'' + optionalString (sshPublicKey != null) ''
mkdir -p $out/1.0/meta-data/public-keys/0
ln -s ${pkgs.writeText "sshPublicKey" sshPublicKey} $out/1.0/meta-data/public-keys/0/openssh-key
'';
};
indentLines = str: concatLines (map (s: " " + s) (splitString "\n" str));
in makeTest {
name = "ec2-" + name;
nodes = {};
testScript = ''
import os
import subprocess
import tempfile
image_dir = os.path.join(
os.environ.get("TMPDIR", tempfile.gettempdir()), "tmp", "vm-state-machine"
)
os.makedirs(image_dir, mode=0o700, exist_ok=True)
disk_image = os.path.join(image_dir, "machine.qcow2")
subprocess.check_call(
[
"qemu-img",
"create",
"-f",
"qcow2",
"-F",
"qcow2",
"-o",
"backing_file=${image}",
disk_image,
]
)
subprocess.check_call(["qemu-img", "resize", disk_image, "10G"])
# Note: we use net=169.0.0.0/8 rather than
# net=169.254.0.0/16 to prevent dhcpcd from getting horribly
# confused. (It would get a DHCP lease in the 169.254.*
# range, which it would then configure and promptly delete
# again when it deletes link-local addresses.) Ideally we'd
# turn off the DHCP server, but qemu does not have an option
# to do that.
start_command = (
"qemu-kvm -m 1024"
+ " -device virtio-net-pci,netdev=vlan0"
+ " -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}'"
+ f" -drive file={disk_image},if=virtio,werror=report"
+ " $QEMU_OPTS"
)
machine = create_machine({"startCommand": start_command})
try:
'' + indentLines script + ''
finally:
machine.shutdown()
'';
inherit meta;
};
}