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#!/usr/bin/env python
#
# VM testing base class
#
# Copyright 2017 Red Hat Inc.
#
# Authors:
# Fam Zheng <famz@redhat.com>
#
# This code is licensed under the GPL version 2 or later. See
# the COPYING file in the top-level directory.
#
from __future__ import print_function
import os
import sys
import logging
import time
import datetime
sys.path.append(os.path.join(os.path.dirname(__file__), "..", "..", "scripts"))
from qemu import QEMUMachine, kvm_available
import subprocess
import hashlib
import optparse
import atexit
import tempfile
import shutil
import multiprocessing
import traceback
SSH_KEY = open(os.path.join(os.path.dirname(__file__),
"..", "keys", "id_rsa")).read()
SSH_PUB_KEY = open(os.path.join(os.path.dirname(__file__),
"..", "keys", "id_rsa.pub")).read()
class BaseVM(object):
GUEST_USER = "qemu"
GUEST_PASS = "qemupass"
ROOT_PASS = "qemupass"
# The script to run in the guest that builds QEMU
BUILD_SCRIPT = ""
# The guest name, to be overridden by subclasses
name = "#base"
# The guest architecture, to be overridden by subclasses
arch = "#arch"
def __init__(self, debug=False, vcpus=None):
self._guest = None
self._tmpdir = os.path.realpath(tempfile.mkdtemp(prefix="vm-test-",
suffix=".tmp",
dir="."))
atexit.register(shutil.rmtree, self._tmpdir)
self._ssh_key_file = os.path.join(self._tmpdir, "id_rsa")
open(self._ssh_key_file, "w").write(SSH_KEY)
subprocess.check_call(["chmod", "600", self._ssh_key_file])
self._ssh_pub_key_file = os.path.join(self._tmpdir, "id_rsa.pub")
open(self._ssh_pub_key_file, "w").write(SSH_PUB_KEY)
self.debug = debug
self._stderr = sys.stderr
self._devnull = open(os.devnull, "w")
if self.debug:
self._stdout = sys.stdout
else:
self._stdout = self._devnull
self._args = [ \
"-nodefaults", "-m", "4G",
"-cpu", "max",
"-netdev", "user,id=vnet,hostfwd=:127.0.0.1:0-:22",
"-device", "virtio-net-pci,netdev=vnet",
"-vnc", "127.0.0.1:0,to=20",
"-serial", "file:%s" % os.path.join(self._tmpdir, "serial.out")]
if vcpus and vcpus > 1:
self._args += ["-smp", str(vcpus)]
if kvm_available(self.arch):
self._args += ["-enable-kvm"]
else:
logging.info("KVM not available, not using -enable-kvm")
self._data_args = []
def _download_with_cache(self, url, sha256sum=None):
def check_sha256sum(fname):
if not sha256sum:
return True
checksum = subprocess.check_output(["sha256sum", fname]).split()[0]
return sha256sum == checksum
cache_dir = os.path.expanduser("~/.cache/qemu-vm/download")
if not os.path.exists(cache_dir):
os.makedirs(cache_dir)
fname = os.path.join(cache_dir, hashlib.sha1(url).hexdigest())
if os.path.exists(fname) and check_sha256sum(fname):
return fname
logging.debug("Downloading %s to %s...", url, fname)
subprocess.check_call(["wget", "-c", url, "-O", fname + ".download"],
stdout=self._stdout, stderr=self._stderr)
os.rename(fname + ".download", fname)
return fname
def _ssh_do(self, user, cmd, check, interactive=False):
ssh_cmd = ["ssh", "-q",
"-o", "StrictHostKeyChecking=no",
"-o", "UserKnownHostsFile=" + os.devnull,
"-o", "ConnectTimeout=1",
"-p", self.ssh_port, "-i", self._ssh_key_file]
if interactive:
ssh_cmd += ['-t']
assert not isinstance(cmd, str)
ssh_cmd += ["%s@127.0.0.1" % user] + list(cmd)
logging.debug("ssh_cmd: %s", " ".join(ssh_cmd))
r = subprocess.call(ssh_cmd)
if check and r != 0:
raise Exception("SSH command failed: %s" % cmd)
return r
def ssh(self, *cmd):
return self._ssh_do(self.GUEST_USER, cmd, False)
def ssh_interactive(self, *cmd):
return self._ssh_do(self.GUEST_USER, cmd, False, True)
def ssh_root(self, *cmd):
return self._ssh_do("root", cmd, False)
def ssh_check(self, *cmd):
self._ssh_do(self.GUEST_USER, cmd, True)
def ssh_root_check(self, *cmd):
self._ssh_do("root", cmd, True)
def build_image(self, img):
raise NotImplementedError
def add_source_dir(self, src_dir):
name = "data-" + hashlib.sha1(src_dir).hexdigest()[:5]
tarfile = os.path.join(self._tmpdir, name + ".tar")
logging.debug("Creating archive %s for src_dir dir: %s", tarfile, src_dir)
subprocess.check_call(["./scripts/archive-source.sh", tarfile],
cwd=src_dir, stdin=self._devnull,
stdout=self._stdout, stderr=self._stderr)
self._data_args += ["-drive",
"file=%s,if=none,id=%s,cache=writeback,format=raw" % \
(tarfile, name),
"-device",
"virtio-blk,drive=%s,serial=%s,bootindex=1" % (name, name)]
def boot(self, img, extra_args=[]):
args = self._args + [
"-device", "VGA",
"-drive", "file=%s,if=none,id=drive0,cache=writeback" % img,
"-device", "virtio-blk,drive=drive0,bootindex=0"]
args += self._data_args + extra_args
logging.debug("QEMU args: %s", " ".join(args))
qemu_bin = os.environ.get("QEMU", "qemu-system-" + self.arch)
guest = QEMUMachine(binary=qemu_bin, args=args)
try:
guest.launch()
except:
logging.error("Failed to launch QEMU, command line:")
logging.error(" ".join([qemu_bin] + args))
logging.error("Log:")
logging.error(guest.get_log())
logging.error("QEMU version >= 2.10 is required")
raise
atexit.register(self.shutdown)
self._guest = guest
usernet_info = guest.qmp("human-monitor-command",
command_line="info usernet")
self.ssh_port = None
for l in usernet_info["return"].splitlines():
fields = l.split()
if "TCP[HOST_FORWARD]" in fields and "22" in fields:
self.ssh_port = l.split()[3]
if not self.ssh_port:
raise Exception("Cannot find ssh port from 'info usernet':\n%s" % \
usernet_info)
def wait_ssh(self, seconds=300):
starttime = datetime.datetime.now()
endtime = starttime + datetime.timedelta(seconds=seconds)
guest_up = False
while datetime.datetime.now() < endtime:
if self.ssh("exit 0") == 0:
guest_up = True
break
seconds = (endtime - datetime.datetime.now()).total_seconds()
logging.debug("%ds before timeout", seconds)
time.sleep(1)
if not guest_up:
raise Exception("Timeout while waiting for guest ssh")
def shutdown(self):
self._guest.shutdown()
def wait(self):
self._guest.wait()
def qmp(self, *args, **kwargs):
return self._guest.qmp(*args, **kwargs)
def parse_args(vmcls):
def get_default_jobs():
if kvm_available(vmcls.arch):
return multiprocessing.cpu_count() / 2
else:
return 1
parser = optparse.OptionParser(
description="VM test utility. Exit codes: "
"0 = success, "
"1 = command line error, "
"2 = environment initialization failed, "
"3 = test command failed")
parser.add_option("--debug", "-D", action="store_true",
help="enable debug output")
parser.add_option("--image", "-i", default="%s.img" % vmcls.name,
help="image file name")
parser.add_option("--force", "-f", action="store_true",
help="force build image even if image exists")
parser.add_option("--jobs", type=int, default=get_default_jobs(),
help="number of virtual CPUs")
parser.add_option("--verbose", "-V", action="store_true",
help="Pass V=1 to builds within the guest")
parser.add_option("--build-image", "-b", action="store_true",
help="build image")
parser.add_option("--build-qemu",
help="build QEMU from source in guest")
parser.add_option("--interactive", "-I", action="store_true",
help="Interactively run command")
parser.add_option("--snapshot", "-s", action="store_true",
help="run tests with a snapshot")
parser.disable_interspersed_args()
return parser.parse_args()
def main(vmcls):
try:
args, argv = parse_args(vmcls)
if not argv and not args.build_qemu and not args.build_image:
print("Nothing to do?")
return 1
logging.basicConfig(level=(logging.DEBUG if args.debug
else logging.WARN))
vm = vmcls(debug=args.debug, vcpus=args.jobs)
if args.build_image:
if os.path.exists(args.image) and not args.force:
sys.stderr.writelines(["Image file exists: %s\n" % args.image,
"Use --force option to overwrite\n"])
return 1
return vm.build_image(args.image)
if args.build_qemu:
vm.add_source_dir(args.build_qemu)
cmd = [vm.BUILD_SCRIPT.format(
configure_opts = " ".join(argv),
jobs=args.jobs,
verbose = "V=1" if args.verbose else "")]
else:
cmd = argv
img = args.image
if args.snapshot:
img += ",snapshot=on"
vm.boot(img)
vm.wait_ssh()
except Exception as e:
if isinstance(e, SystemExit) and e.code == 0:
return 0
sys.stderr.write("Failed to prepare guest environment\n")
traceback.print_exc()
return 2
if args.interactive:
if vm.ssh_interactive(*cmd) == 0:
return 0
vm.ssh_interactive()
return 3
else:
if vm.ssh(*cmd) != 0:
return 3
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