xref: /openbmc/qemu/tests/vm/basevm.py (revision 3ae8a100) 
1#!/usr/bin/env python
2#
3# VM testing base class
4#
5# Copyright 2017 Red Hat Inc.
6#
7# Authors:
8#  Fam Zheng <famz@redhat.com>
9#
10# This code is licensed under the GPL version 2 or later.  See
11# the COPYING file in the top-level directory.
12#
13
14from __future__ import print_function
15import os
16import sys
17import logging
18import time
19import datetime
20sys.path.append(os.path.join(os.path.dirname(__file__), "..", "..", "scripts"))
21from qemu import QEMUMachine
22import subprocess
23import hashlib
24import optparse
25import atexit
26import tempfile
27import shutil
28import multiprocessing
29import traceback
30
31SSH_KEY = open(os.path.join(os.path.dirname(__file__),
32               "..", "keys", "id_rsa")).read()
33SSH_PUB_KEY = open(os.path.join(os.path.dirname(__file__),
34                   "..", "keys", "id_rsa.pub")).read()
35
36class BaseVM(object):
37    GUEST_USER = "qemu"
38    GUEST_PASS = "qemupass"
39    ROOT_PASS = "qemupass"
40
41    # The script to run in the guest that builds QEMU
42    BUILD_SCRIPT = ""
43    # The guest name, to be overridden by subclasses
44    name = "#base"
45    def __init__(self, debug=False, vcpus=None):
46        self._guest = None
47        self._tmpdir = os.path.realpath(tempfile.mkdtemp(prefix="vm-test-",
48                                                         suffix=".tmp",
49                                                         dir="."))
50        atexit.register(shutil.rmtree, self._tmpdir)
51
52        self._ssh_key_file = os.path.join(self._tmpdir, "id_rsa")
53        open(self._ssh_key_file, "w").write(SSH_KEY)
54        subprocess.check_call(["chmod", "600", self._ssh_key_file])
55
56        self._ssh_pub_key_file = os.path.join(self._tmpdir, "id_rsa.pub")
57        open(self._ssh_pub_key_file, "w").write(SSH_PUB_KEY)
58
59        self.debug = debug
60        self._stderr = sys.stderr
61        self._devnull = open(os.devnull, "w")
62        if self.debug:
63            self._stdout = sys.stdout
64        else:
65            self._stdout = self._devnull
66        self._args = [ \
67            "-nodefaults", "-m", "2G",
68            "-cpu", "host",
69            "-netdev", "user,id=vnet,hostfwd=:127.0.0.1:0-:22",
70            "-device", "virtio-net-pci,netdev=vnet",
71            "-vnc", "127.0.0.1:0,to=20",
72            "-serial", "file:%s" % os.path.join(self._tmpdir, "serial.out")]
73        if vcpus:
74            self._args += ["-smp", str(vcpus)]
75        if os.access("/dev/kvm", os.R_OK | os.W_OK):
76            self._args += ["-enable-kvm"]
77        else:
78            logging.info("KVM not available, not using -enable-kvm")
79        self._data_args = []
80
81    def _download_with_cache(self, url, sha256sum=None):
82        def check_sha256sum(fname):
83            if not sha256sum:
84                return True
85            checksum = subprocess.check_output(["sha256sum", fname]).split()[0]
86            return sha256sum == checksum
87
88        cache_dir = os.path.expanduser("~/.cache/qemu-vm/download")
89        if not os.path.exists(cache_dir):
90            os.makedirs(cache_dir)
91        fname = os.path.join(cache_dir, hashlib.sha1(url).hexdigest())
92        if os.path.exists(fname) and check_sha256sum(fname):
93            return fname
94        logging.debug("Downloading %s to %s...", url, fname)
95        subprocess.check_call(["wget", "-c", url, "-O", fname + ".download"],
96                              stdout=self._stdout, stderr=self._stderr)
97        os.rename(fname + ".download", fname)
98        return fname
99
100    def _ssh_do(self, user, cmd, check, interactive=False):
101        ssh_cmd = ["ssh", "-q",
102                   "-o", "StrictHostKeyChecking=no",
103                   "-o", "UserKnownHostsFile=" + os.devnull,
104                   "-o", "ConnectTimeout=1",
105                   "-p", self.ssh_port, "-i", self._ssh_key_file]
106        if interactive:
107            ssh_cmd += ['-t']
108        assert not isinstance(cmd, str)
109        ssh_cmd += ["%s@127.0.0.1" % user] + list(cmd)
110        logging.debug("ssh_cmd: %s", " ".join(ssh_cmd))
111        r = subprocess.call(ssh_cmd)
112        if check and r != 0:
113            raise Exception("SSH command failed: %s" % cmd)
114        return r
115
116    def ssh(self, *cmd):
117        return self._ssh_do(self.GUEST_USER, cmd, False)
118
119    def ssh_interactive(self, *cmd):
120        return self._ssh_do(self.GUEST_USER, cmd, False, True)
121
122    def ssh_root(self, *cmd):
123        return self._ssh_do("root", cmd, False)
124
125    def ssh_check(self, *cmd):
126        self._ssh_do(self.GUEST_USER, cmd, True)
127
128    def ssh_root_check(self, *cmd):
129        self._ssh_do("root", cmd, True)
130
131    def build_image(self, img):
132        raise NotImplementedError
133
134    def add_source_dir(self, src_dir):
135        name = "data-" + hashlib.sha1(src_dir).hexdigest()[:5]
136        tarfile = os.path.join(self._tmpdir, name + ".tar")
137        logging.debug("Creating archive %s for src_dir dir: %s", tarfile, src_dir)
138        subprocess.check_call(["./scripts/archive-source.sh", tarfile],
139                              cwd=src_dir, stdin=self._devnull,
140                              stdout=self._stdout, stderr=self._stderr)
141        self._data_args += ["-drive",
142                            "file=%s,if=none,id=%s,cache=writeback,format=raw" % \
143                                    (tarfile, name),
144                            "-device",
145                            "virtio-blk,drive=%s,serial=%s,bootindex=1" % (name, name)]
146
147    def boot(self, img, extra_args=[]):
148        args = self._args + [
149            "-device", "VGA",
150            "-drive", "file=%s,if=none,id=drive0,cache=writeback" % img,
151            "-device", "virtio-blk,drive=drive0,bootindex=0"]
152        args += self._data_args + extra_args
153        logging.debug("QEMU args: %s", " ".join(args))
154        qemu_bin = os.environ.get("QEMU", "qemu-system-x86_64")
155        guest = QEMUMachine(binary=qemu_bin, args=args)
156        try:
157            guest.launch()
158        except:
159            logging.error("Failed to launch QEMU, command line:")
160            logging.error(" ".join([qemu_bin] + args))
161            logging.error("Log:")
162            logging.error(guest.get_log())
163            logging.error("QEMU version >= 2.10 is required")
164            raise
165        atexit.register(self.shutdown)
166        self._guest = guest
167        usernet_info = guest.qmp("human-monitor-command",
168                                 command_line="info usernet")
169        self.ssh_port = None
170        for l in usernet_info["return"].splitlines():
171            fields = l.split()
172            if "TCP[HOST_FORWARD]" in fields and "22" in fields:
173                self.ssh_port = l.split()[3]
174        if not self.ssh_port:
175            raise Exception("Cannot find ssh port from 'info usernet':\n%s" % \
176                            usernet_info)
177
178    def wait_ssh(self, seconds=120):
179        starttime = datetime.datetime.now()
180        guest_up = False
181        while (datetime.datetime.now() - starttime).total_seconds() < seconds:
182            if self.ssh("exit 0") == 0:
183                guest_up = True
184                break
185            time.sleep(1)
186        if not guest_up:
187            raise Exception("Timeout while waiting for guest ssh")
188
189    def shutdown(self):
190        self._guest.shutdown()
191
192    def wait(self):
193        self._guest.wait()
194
195    def qmp(self, *args, **kwargs):
196        return self._guest.qmp(*args, **kwargs)
197
198def parse_args(vm_name):
199    parser = optparse.OptionParser(
200        description="VM test utility.  Exit codes: "
201                    "0 = success, "
202                    "1 = command line error, "
203                    "2 = environment initialization failed, "
204                    "3 = test command failed")
205    parser.add_option("--debug", "-D", action="store_true",
206                      help="enable debug output")
207    parser.add_option("--image", "-i", default="%s.img" % vm_name,
208                      help="image file name")
209    parser.add_option("--force", "-f", action="store_true",
210                      help="force build image even if image exists")
211    parser.add_option("--jobs", type=int, default=multiprocessing.cpu_count() / 2,
212                      help="number of virtual CPUs")
213    parser.add_option("--build-image", "-b", action="store_true",
214                      help="build image")
215    parser.add_option("--build-qemu",
216                      help="build QEMU from source in guest")
217    parser.add_option("--interactive", "-I", action="store_true",
218                      help="Interactively run command")
219    parser.disable_interspersed_args()
220    return parser.parse_args()
221
222def main(vmcls):
223    try:
224        args, argv = parse_args(vmcls.name)
225        if not argv and not args.build_qemu and not args.build_image:
226            print("Nothing to do?")
227            return 1
228        logging.basicConfig(level=(logging.DEBUG if args.debug
229                                   else logging.WARN))
230        vm = vmcls(debug=args.debug, vcpus=args.jobs)
231        if args.build_image:
232            if os.path.exists(args.image) and not args.force:
233                sys.stderr.writelines(["Image file exists: %s\n" % args.image,
234                                      "Use --force option to overwrite\n"])
235                return 1
236            return vm.build_image(args.image)
237        if args.build_qemu:
238            vm.add_source_dir(args.build_qemu)
239            cmd = [vm.BUILD_SCRIPT.format(
240                   configure_opts = " ".join(argv),
241                   jobs=args.jobs)]
242        else:
243            cmd = argv
244        vm.boot(args.image + ",snapshot=on")
245        vm.wait_ssh()
246    except Exception as e:
247        if isinstance(e, SystemExit) and e.code == 0:
248            return 0
249        sys.stderr.write("Failed to prepare guest environment\n")
250        traceback.print_exc()
251        return 2
252
253    if args.interactive:
254        if vm.ssh_interactive(*cmd) == 0:
255            return 0
256        vm.ssh_interactive()
257        return 3
258    else:
259        if vm.ssh(*cmd) != 0:
260            return 3
261