nixos/tests/kubo: test new /mfs/ FUSE mount point

        machine.succeed(f"diff /tmp/test.txt /ipfs/{ipfs_hash}")

    with subtest("Unmounting of /ipns and /ipfs"):

    with subtest("/mfs/ FUSE mountpoint"):

        with subtest("Write the test file in three different ways"):

            machine.succeed("cp /tmp/test.txt /mfs/test-1.txt")

            machine.succeed("su alice -c 'ipfs files write --create /test-2.txt < /tmp/test.txt'")

            machine.succeed(f"ipfs files cp /ipfs/{ipfs_hash} /test-3.txt")

        with subtest("Show the files (for debugging)"):

            # Different hashes for the different ways of adding the file to the MFS probably come from different linking structures of the merkle tree. Copying the file to /mfs with `cp` is even non-deterministic.

            machine.succeed("ipfs files ls --long >&2")

            machine.succeed("ls -l /mfs >&2")

        with subtest("Check that everyone has permission to read the file (because of Mounts.FuseAllowOther)"):

            machine.succeed("su alice -c 'cat /mfs/test-1.txt' | grep fnord3")

            machine.succeed("su bob -c 'cat /mfs/test-1.txt' | grep fnord3")

        with subtest("Check the file contents"):

            machine.succeed("diff /tmp/test.txt /mfs/test-1.txt")

            machine.succeed("diff /tmp/test.txt /mfs/test-2.txt")

            machine.succeed("diff /tmp/test.txt /mfs/test-3.txt")

        with subtest("Check the CID extended attribute"):

            output = machine.succeed(

                "getfattr --only-values --name=ipfs_cid /mfs/test-3.txt"

            ).strip()

            assert ipfs_hash == output, f"Expected {ipfs_hash} but got {output}"

    with subtest("Unmounting of /ipns, /ipfs and /mfs"):

        # Force Kubo to crash and wait for it to restart

        machine.systemctl("kill --signal=SIGKILL ipfs.service")

        machine.wait_for_unit("ipfs.service", timeout = 30)

        machine.succeed(f"diff /tmp/test.txt /ipfs/{ipfs_hash}")

        machine.succeed("diff /tmp/test.txt /mfs/test-3.txt")

  '';

}