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#!/usr/bin/env python3
import logging
import os
import random
import shlex
import shutil
import signal
import subprocess
import tempfile
import time
CLOUD_INIT_META_TEMPLATE = """\
# Amazon EC2 style metadata
local-hostname: {hostname}
"""
CLOUD_INIT_USER_TEMPLATE = """\
#cloud-config
ssh_authorized_keys:
- {pubkey}
"""
class QemuSystem:
def __init__(self, name, base_image, disk_size, pubkey):
self._name = name
self._dirname = "."
self._image = self._copy_image(base_image, disk_size)
self._pubkey = pubkey
self._memory = 512
self._vcpus = 1
self._username = None
self._port = None
self._pid = None
fd, self._knownhosts = tempfile.mkstemp()
os.close(fd)
def _join(self, *names):
return os.path.join(self._dirname, *names)
def set_disk_size(self, size):
self._disk_size = str(size * 1024 * 1024)
def set_memory(self, memory):
self._memory = memory
def set_vcpus(self, vcpus):
self._vcpus = vcpus
def set_username(self, username):
self._username = username
def get_port(self):
return self._port
def _copy_image(self, base_image, size):
image = self._join("qemu.img")
logging.debug(f"QemuSystem: actual disk image: {image}")
shutil.copy(base_image, image)
if size is not None:
subprocess.check_call(["qemu-img", "resize", "-q", image, str(size)])
return image
def _cloud_init_iso(self):
iso = self._join("cloud-init.iso")
config = self._join("cloud-init")
os.mkdir(config)
meta = os.path.join(config, "meta-data")
write_file(meta, CLOUD_INIT_META_TEMPLATE.format(hostname=self._name))
user = os.path.join(config, "user-data")
write_file(user, CLOUD_INIT_USER_TEMPLATE.format(pubkey=self._pubkey))
if os.path.exists(iso):
os.remove(iso)
subprocess.check_call(
[
"genisoimage",
"-quiet",
"-joliet",
"-rock",
"-output",
iso,
"-volid",
"cidata",
config,
]
)
return iso
def start(self):
iso = self._cloud_init_iso()
self._port = random.randint(2000, 30000)
pid_file = self._join("qemu.pid")
out_file = self._join("qemu.out")
err_file = self._join("qemu.err")
MiB = 1024 ** 2
memory = int(self._memory / MiB)
argv = [
"/usr/bin/daemonize",
"-c",
self._dirname,
"-p",
pid_file,
"-e",
err_file,
"-o",
out_file,
"/usr/bin/qemu-system-x86_64",
"-name",
self._name,
"-m",
str(memory),
"-cpu",
"host",
"-smp",
f"cpus={self._vcpus}",
"-drive",
f"file={self._image},format=qcow2,cache=none,if=virtio",
"-drive",
f"file={iso},if=ide,media=cdrom",
"-device",
"virtio-net,netdev=user.0",
"-netdev",
f"user,id=user.0,hostfwd=tcp::{self._port}-:22",
"-nographic",
"-enable-kvm",
]
subprocess.check_call(argv, stdout=None, stderr=None)
self._pid = int(wait_for(lambda: got_pid(pid_file), 1))
logging.debug("started qemu-system")
logging.debug(f" argv: {argv}")
logging.debug(f" pid: {self._pid}")
def stop(self):
if self._pid is not None:
logging.debug(f"killing qemu-system process {self._pid}")
os.kill(self._pid, signal.SIGTERM)
def wait_for_ssh(self):
def ssh_ok():
output, exit = self.ssh(["true"])
logging.debug(f"tried ssh, exit={exit}")
if exit == 0:
return True
return None
return wait_for(ssh_ok, 300, sleep=5)
def ssh(self, argv):
assert self._username is not None
srcdir = globals()["srcdir"]
ssh_opts = [
"-i",
os.path.join(srcdir, "ssh", "id"),
"-p",
str(self._port),
"-l",
self._username,
f"-ouserknownhostsfile={self._knownhosts}",
"-ostricthostkeychecking=accept-new",
"-opasswordauthentication=no",
]
real_argv = (
["ssh"] + ssh_opts + ["localhost", "--"] + [shlex.quote(x) for x in argv]
)
logging.debug(f"running on VM: {real_argv}")
p = subprocess.Popen(
real_argv, stdout=subprocess.PIPE, stderr=subprocess.STDOUT
)
output, _ = p.communicate()
logging.debug(f"exit code: {p.returncode}")
logging.debug(f"output: {output}")
return output, p.returncode
def read_file(filename):
with open(filename, "r") as f:
return f.read()
def write_file(filename, content):
with open(filename, "w") as f:
f.write(content)
def wait_for(func, timeout, sleep=0.1):
start = time.time()
while time.time() < start + timeout:
val = func()
if val is not None:
return val
time.sleep(sleep)
def got_pid(pid_file):
if os.path.exists(pid_file):
pid = read_file(pid_file)
if pid:
return pid.strip()
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