nixpkgs/nixos/tests/nvmetcfg.nix

import ./make-test-python.nix (
  { lib, ... }:
  {
    name = "nvmetcfg";

    meta = {
      maintainers = with lib.maintainers; [ nickcao ];
    };

    nodes = {
      server =
        { pkgs, ... }:
        {
          boot.kernelModules = [ "nvmet" ];
          environment.systemPackages = [ pkgs.nvmetcfg ];
          networking.firewall.allowedTCPPorts = [ 4420 ];
          virtualisation.emptyDiskImages = [ 512 ];
        };
      client =
        { pkgs, ... }:
        {
          boot.kernelModules = [ "nvme-fabrics" ];
          environment.systemPackages = [ pkgs.nvme-cli ];
        };
    };

    testScript =
      let
        subsystem = "nqn.2014-08.org.nixos:server";
      in
      ''
        import json

        with subtest("Create subsystem and namespace"):
          server.succeed("nvmet subsystem add ${subsystem}")
          server.succeed("nvmet namespace add ${subsystem} 1 /dev/vdb")

        with subtest("Bind subsystem to port"):
          server.wait_for_unit("network-online.target")
          server.succeed("nvmet port add 1 tcp [::]:4420")
          server.succeed("nvmet port add-subsystem 1 ${subsystem}")

        with subtest("Discover and connect to available subsystems"):
          client.wait_for_unit("network-online.target")
          assert "subnqn:  ${subsystem}" in client.succeed("nvme discover --transport=tcp --traddr=server --trsvcid=4420")
          client.succeed("nvme connect-all --transport=tcp --traddr=server --trsvcid=4420")

        with subtest("Write to the connected subsystem"):
          devices = json.loads(client.succeed("lsblk --nvme --paths --json"))["blockdevices"]
          assert len(devices) == 1
          client.succeed(f"dd if=/dev/zero of={devices[0]['name']} bs=1M count=64")
      '';
  }
)