def METHOD_NAME(self, img):
    self.print_step("Downloading install iso")
    cimg = self._download_with_cache(self.link, sha256sum=self.csum)
    img_tmp = img + ".tmp"
    iso = img + ".install.iso"
    self.print_step("Preparing iso and disk image")
    subprocess.check_call(["cp", "-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",
        "-device", "VGA",
        "-cdrom", iso
    ])
    self.console_init()
    self.console_wait_send("boot>", "set tty com0\n")
    self.console_wait_send("boot>", "\n")
    # pre-install configuration
    self.console_wait_send("(I)nstall",               "i\n")
    self.console_wait_send("Terminal type",           "xterm\n")
    self.console_wait_send("System hostname",         "openbsd\n")
    self.console_wait_send("Which network interface", "vio0\n")
    self.console_wait_send("IPv4 address",            "autoconf\n")
    self.console_wait_send("IPv6 address",            "none\n")
    self.console_wait_send("Which network interface", "done\n")
    self.console_wait("Password for root account")
    self.console_send("%s\n" % self._config["root_pass"])
    self.console_wait("Password for root account")
    self.console_send("%s\n" % self._config["root_pass"])
    self.console_wait_send("Start sshd(8)",           "yes\n")
    self.console_wait_send("X Window System",         "\n")
    self.console_wait_send("xenodm",                  "\n")
    self.console_wait_send("console to com0",         "\n")
    self.console_wait_send("Which speed",             "\n")
    self.console_wait("Setup a user")
    self.console_send("%s\n" % self._config["guest_user"])
    self.console_wait("Full name")
    self.console_send("%s\n" % self._config["guest_user"])
    self.console_wait("Password")
    self.console_send("%s\n" % self._config["guest_pass"])
    self.console_wait("Password")
    self.console_send("%s\n" % self._config["guest_pass"])
    self.console_wait_send("Allow root ssh login",    "yes\n")
    self.console_wait_send("timezone",                "UTC\n")
    self.console_wait_send("root disk",               "\n")
    self.console_wait_send("(W)hole disk",            "\n")
    self.console_wait_send("(A)uto layout",           "\n")
    self.console_wait_send("Location of sets",        "cd0\n")
    self.console_wait_send("Pathname to the sets",    "\n")
    self.console_wait_send("Set name(s)",             "\n")
    self.console_wait_send("without verification",    "yes\n")
    self.print_step("Installation started now, this will take a while")
    self.console_wait_send("Location of sets",        "done\n")
    self.console_wait("successfully completed")
    self.print_step("Installation finished, rebooting")
    self.console_wait_send("(R)eboot",                "reboot\n")
    # setup qemu user
    prompt = "$"
    self.console_ssh_init(prompt, self._config["guest_user"],
                                  self._config["guest_pass"])
    self.console_wait_send(prompt, "exit\n")
    # setup root user
    prompt = "openbsd#"
    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/rsd1c' >> /etc/rc.local\n")
    # enable w+x for /home
    self.console_wait(prompt)
    self.console_send("sed -i -e '/home/s/rw,/rw,wxallowed,/' /etc/fstab\n")
    # tweak datasize limit
    self.console_wait(prompt)
    self.console_send("sed -i -e 's/\\(datasize[^=]*\\)=[^:]*/\\1=infinity/' /etc/login.conf\n")
    # use http (be proxy cache friendly)
    self.console_wait(prompt)
    self.console_send("sed -i -e 's/https/http/' /etc/installurl\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("pkg_add %s\n" % " ".join(self.pkgs))
    # shutdown
    self.ssh_root(self.poweroff)
    self.wait()
    if os.path.exists(img):
        os.remove(img)
    os.rename(img_tmp, img)
    os.remove(iso)
    self.print_step("All done")