def METHOD_NAME(self, img):
    cimg = self._download_with_cache(self.link, sha512sum=self.csum)
    img_tmp = img + ".tmp"
    iso = img + ".install.iso"
    self.print_step("Preparing iso and disk image")
    subprocess.check_call(["ln", "-f", cimg, iso])
    self.exec_qemu_img("create", "-f", "qcow2", img_tmp, self.size)
    self.print_step("Booting installer")
    self.boot(img_tmp, extra_args = [
        "-bios", "pc-bios/bios-256k.bin",
        "-machine", "graphics=off",
        "-cdrom", iso
    ])
    self.console_init()
    self.console_wait_send("3. Drop to boot prompt", "3")
    self.console_wait_send("> ", "consdev com0\n")
    self.console_wait_send("> ", "boot\n")
    self.console_wait_send("Terminal type",            "xterm\n")
    self.console_wait_send("a: Installation messages", "a\n")
    self.console_wait_send("a: Install NetBSD",        "a\n")
    self.console_wait("Shall we continue?")
    self.console_wait_send("b: Yes",                   "b\n")
    self.console_wait_send("a: ld0",                   "a\n")
    self.console_wait_send("a: Guid Partition Table",  "a\n")
    self.console_wait_send("a: This is the correct",   "a\n")
    self.console_wait_send("b: Use default part",      "b\n")
    self.console_wait_send("x: Partition sizes ok",    "x\n")
    self.console_wait("Shall we continue?")
    self.console_wait_send("b: Yes",                   "b\n")
    self.console_wait_send("b: Use serial port com0",  "b\n")
    self.console_wait_send("f: Set serial baud rate",  "f\n")
    self.console_wait_send("a: 9600",                  "a\n")
    self.console_wait_send("x: Continue",              "x\n")
    self.console_wait_send("a: Full installation",     "a\n")
    self.console_wait_send("a: CD-ROM",                "a\n")
    self.print_step("Installation started now, this will take a while")
    self.console_wait_send("Hit enter to continue",    "\n")
    self.console_wait_send("d: Change root password",  "d\n")
    self.console_wait_send("a: Yes",                   "a\n")
    self.console_wait("New password:")
    self.console_send("%s\n" % self._config["root_pass"])
    self.console_wait("New password:")
    self.console_send("%s\n" % self._config["root_pass"])
    self.console_wait("Retype new password:")
    self.console_send("%s\n" % self._config["root_pass"])
    self.console_wait_send("o: Add a user",            "o\n")
    self.console_wait("username")
    self.console_send("%s\n" % self._config["guest_user"])
    self.console_wait("to group wheel")
    self.console_wait_send("a: Yes",                   "a\n")
    self.console_wait_send("a: /bin/sh",               "a\n")
    self.console_wait("New password:")
    self.console_send("%s\n" % self._config["guest_pass"])
    self.console_wait("New password:")
    self.console_send("%s\n" % self._config["guest_pass"])
    self.console_wait("Retype new password:")
    self.console_send("%s\n" % self._config["guest_pass"])
    self.console_wait_send("a: Configure network",     "a\n")
    self.console_wait_send("a: vioif0",                "a\n")
    self.console_wait_send("Network media type",       "\n")
    self.console_wait("autoconfiguration")
    self.console_wait_send("a: Yes",                   "a\n")
    self.console_wait_send("DNS domain",               "localnet\n")
    self.console_wait("Are they OK?")
    self.console_wait_send("a: Yes",                   "a\n")
    self.console_wait("installed in /etc")
    self.console_wait_send("a: Yes",                   "a\n")
    self.console_wait_send("e: Enable install",        "e\n")
    proxy = os.environ.get("http_proxy")
    if not proxy is None:
        self.console_wait_send("f: Proxy",             "f\n")
        self.console_wait("Proxy")
        self.console_send("%s\n" % proxy)
    self.console_wait_send("x: Install pkgin",         "x\n")
    self.console_init(1200)
    self.console_wait_send("Hit enter to continue", "\n")
    self.console_init()
    self.console_wait_send("g: Enable sshd",           "g\n")
    self.console_wait_send("x: Finished conf",         "x\n")
    self.console_wait_send("Hit enter to continue",    "\n")
    self.print_step("Installation finished, rebooting")
    self.console_wait_send("d: Reboot the computer",   "d\n")
    # setup qemu user
    prompt = "localhost$"
    self.console_ssh_init(prompt, self._config["guest_user"],
                                  self._config["guest_pass"])
    self.console_wait_send(prompt, "exit\n")
    # setup root user
    prompt = "localhost#"
    self.console_ssh_init(prompt, "root", self._config["root_pass"])
    self.console_sshd_config(prompt)
    # setup virtio-blk #1 (tarfile)
    self.console_wait(prompt)
    self.console_send("echo 'chmod 666 /dev/rld1a' >> /etc/rc.local\n")
    # turn off mprotect (conflicts with tcg)
    self.console_wait(prompt)
    self.console_send("echo security.pax.mprotect.enabled=0 >> /etc/sysctl.conf\n")
    self.print_step("Configuration finished, rebooting")
    self.console_wait_send(prompt, "reboot\n")
    self.console_wait("login:")
    self.wait_ssh()
    self.print_step("Installing packages")
    self.ssh_root_check("pkgin update\n")
    self.ssh_root_check("pkgin -y install %s\n" % " ".join(self.pkgs))
    # shutdown
    self.ssh_root(self.poweroff)
    self.console_wait("entering state S5")
    self.wait()
    os.rename(img_tmp, img)
    os.remove(iso)
    self.print_step("All done")