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tests: Add vm test lib
This is the common code to implement a "VM test" to 1) Download and initialize a pre-defined VM that has necessary dependencies to build QEMU and SSH access. 2) Archive $SRC_PATH to a .tar file. 3) Boot the VM, and pass the source tar file to the guest. 4) SSH into the VM, untar the source tarball, build from the source. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Fam Zheng
parent
57446e32ac
commit
ff2ebff079
262
tests/vm/basevm.py
Executable file
262
tests/vm/basevm.py
Executable file
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#!/usr/bin/env python
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#
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# VM testing base class
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#
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# Copyright 2017 Red Hat Inc.
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#
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# Authors:
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# Fam Zheng <famz@redhat.com>
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#
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# This code is licensed under the GPL version 2 or later. See
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# the COPYING file in the top-level directory.
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#
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import os
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import sys
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import logging
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import time
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import datetime
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sys.path.append(os.path.join(os.path.dirname(__file__), "..", "..", "scripts"))
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from qemu import QEMUMachine
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import subprocess
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import hashlib
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import optparse
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import atexit
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import tempfile
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import shutil
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import multiprocessing
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import traceback
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SSH_KEY = open(os.path.join(os.path.dirname(__file__),
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"..", "keys", "id_rsa")).read()
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SSH_PUB_KEY = open(os.path.join(os.path.dirname(__file__),
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"..", "keys", "id_rsa.pub")).read()
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class BaseVM(object):
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GUEST_USER = "qemu"
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GUEST_PASS = "qemupass"
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ROOT_PASS = "qemupass"
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# The script to run in the guest that builds QEMU
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BUILD_SCRIPT = ""
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# The guest name, to be overridden by subclasses
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name = "#base"
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def __init__(self, debug=False, vcpus=None):
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self._guest = None
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self._tmpdir = os.path.realpath(tempfile.mkdtemp(prefix="vm-test-",
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suffix=".tmp",
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dir="."))
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atexit.register(shutil.rmtree, self._tmpdir)
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self._ssh_key_file = os.path.join(self._tmpdir, "id_rsa")
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open(self._ssh_key_file, "w").write(SSH_KEY)
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subprocess.check_call(["chmod", "600", self._ssh_key_file])
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self._ssh_pub_key_file = os.path.join(self._tmpdir, "id_rsa.pub")
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open(self._ssh_pub_key_file, "w").write(SSH_PUB_KEY)
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self.debug = debug
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self._stderr = sys.stderr
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self._devnull = open(os.devnull, "w")
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if self.debug:
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self._stdout = sys.stdout
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else:
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self._stdout = self._devnull
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self._args = [ \
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"-nodefaults", "-m", "2G",
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"-cpu", "host",
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"-netdev", "user,id=vnet,hostfwd=:127.0.0.1:0-:22",
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"-device", "virtio-net-pci,netdev=vnet",
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"-vnc", "127.0.0.1:0,to=20",
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"-serial", "file:%s" % os.path.join(self._tmpdir, "serial.out")]
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if vcpus:
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self._args += ["-smp", str(vcpus)]
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if os.access("/dev/kvm", os.R_OK | os.W_OK):
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self._args += ["-enable-kvm"]
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else:
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logging.info("KVM not available, not using -enable-kvm")
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self._data_args = []
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def _download_with_cache(self, url, sha256sum=None):
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def check_sha256sum(fname):
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if not sha256sum:
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return True
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checksum = subprocess.check_output(["sha256sum", fname]).split()[0]
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return sha256sum == checksum
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cache_dir = os.path.expanduser("~/.cache/qemu-vm/download")
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if not os.path.exists(cache_dir):
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os.makedirs(cache_dir)
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fname = os.path.join(cache_dir, hashlib.sha1(url).hexdigest())
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if os.path.exists(fname) and check_sha256sum(fname):
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return fname
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logging.debug("Downloading %s to %s...", url, fname)
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subprocess.check_call(["wget", "-c", url, "-O", fname + ".download"],
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stdout=self._stdout, stderr=self._stderr)
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os.rename(fname + ".download", fname)
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return fname
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def _ssh_do(self, user, cmd, check, interactive=False):
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ssh_cmd = ["ssh", "-q",
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"-o", "StrictHostKeyChecking=no",
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"-o", "UserKnownHostsFile=" + os.devnull,
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"-o", "ConnectTimeout=1",
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"-p", self.ssh_port, "-i", self._ssh_key_file]
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if interactive:
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ssh_cmd += ['-t']
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assert not isinstance(cmd, str)
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ssh_cmd += ["%s@127.0.0.1" % user] + list(cmd)
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logging.debug("ssh_cmd: %s", " ".join(ssh_cmd))
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r = subprocess.call(ssh_cmd,
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stdin=sys.stdin if interactive else self._devnull,
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stdout=sys.stdout if interactive else self._stdout,
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stderr=sys.stderr if interactive else self._stderr)
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if check and r != 0:
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raise Exception("SSH command failed: %s" % cmd)
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return r
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def ssh(self, *cmd):
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return self._ssh_do(self.GUEST_USER, cmd, False)
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def ssh_interactive(self, *cmd):
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return self._ssh_do(self.GUEST_USER, cmd, False, True)
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def ssh_root(self, *cmd):
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return self._ssh_do("root", cmd, False)
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def ssh_check(self, *cmd):
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self._ssh_do(self.GUEST_USER, cmd, True)
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def ssh_root_check(self, *cmd):
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self._ssh_do("root", cmd, True)
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def build_image(self, img):
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raise NotImplementedError
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def add_source_dir(self, src_dir):
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name = "data-" + hashlib.sha1(src_dir).hexdigest()[:5]
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tarfile = os.path.join(self._tmpdir, name + ".tar")
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logging.debug("Creating archive %s for src_dir dir: %s", tarfile, src_dir)
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subprocess.check_call(["./scripts/archive-source.sh", tarfile],
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cwd=src_dir, stdin=self._devnull,
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stdout=self._stdout, stderr=self._stderr)
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self._data_args += ["-drive",
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"file=%s,if=none,id=%s,cache=writeback,format=raw" % \
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(tarfile, name),
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"-device",
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"virtio-blk,drive=%s,serial=%s,bootindex=1" % (name, name)]
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def boot(self, img, extra_args=[]):
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args = self._args + [
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"-device", "VGA",
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"-drive", "file=%s,if=none,id=drive0,cache=writeback" % img,
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"-device", "virtio-blk,drive=drive0,bootindex=0"]
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args += self._data_args + extra_args
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logging.debug("QEMU args: %s", " ".join(args))
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qemu_bin = os.environ.get("QEMU", "qemu-system-x86_64")
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guest = QEMUMachine(binary=qemu_bin, args=args)
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try:
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guest.launch()
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except:
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logging.error("Failed to launch QEMU, command line:")
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logging.error(" ".join([qemu_bin] + args))
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logging.error("Log:")
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logging.error(guest.get_log())
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logging.error("QEMU version >= 2.10 is required")
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raise
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atexit.register(self.shutdown)
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self._guest = guest
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usernet_info = guest.qmp("human-monitor-command",
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command_line="info usernet")
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self.ssh_port = None
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for l in usernet_info["return"].splitlines():
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fields = l.split()
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if "TCP[HOST_FORWARD]" in fields and "22" in fields:
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self.ssh_port = l.split()[3]
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if not self.ssh_port:
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raise Exception("Cannot find ssh port from 'info usernet':\n%s" % \
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usernet_info)
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def wait_ssh(self, seconds=120):
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starttime = datetime.datetime.now()
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guest_up = False
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while (datetime.datetime.now() - starttime).total_seconds() < seconds:
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if self.ssh("exit 0") == 0:
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guest_up = True
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break
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time.sleep(1)
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if not guest_up:
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raise Exception("Timeout while waiting for guest ssh")
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def shutdown(self):
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self._guest.shutdown()
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def wait(self):
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self._guest.wait()
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def qmp(self, *args, **kwargs):
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return self._guest.qmp(*args, **kwargs)
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def parse_args(vm_name):
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parser = optparse.OptionParser(
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description="VM test utility. Exit codes: "
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"0 = success, "
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"1 = command line error, "
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"2 = environment initialization failed, "
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"3 = test command failed")
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parser.add_option("--debug", "-D", action="store_true",
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help="enable debug output")
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parser.add_option("--image", "-i", default="%s.img" % vm_name,
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help="image file name")
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parser.add_option("--force", "-f", action="store_true",
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help="force build image even if image exists")
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parser.add_option("--jobs", type=int, default=multiprocessing.cpu_count() / 2,
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help="number of virtual CPUs")
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parser.add_option("--build-image", "-b", action="store_true",
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help="build image")
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parser.add_option("--build-qemu",
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help="build QEMU from source in guest")
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parser.add_option("--interactive", "-I", action="store_true",
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help="Interactively run command")
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parser.disable_interspersed_args()
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return parser.parse_args()
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def main(vmcls):
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try:
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args, argv = parse_args(vmcls.name)
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if not argv and not args.build_qemu and not args.build_image:
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print "Nothing to do?"
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return 1
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if args.debug:
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logging.getLogger().setLevel(logging.DEBUG)
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vm = vmcls(debug=args.debug, vcpus=args.jobs)
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if args.build_image:
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if os.path.exists(args.image) and not args.force:
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sys.stderr.writelines(["Image file exists: %s\n" % args.image,
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"Use --force option to overwrite\n"])
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return 1
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return vm.build_image(args.image)
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if args.build_qemu:
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vm.add_source_dir(args.build_qemu)
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cmd = [vm.BUILD_SCRIPT.format(
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configure_opts = " ".join(argv),
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jobs=args.jobs)]
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else:
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cmd = argv
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vm.boot(args.image + ",snapshot=on")
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vm.wait_ssh()
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except Exception as e:
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if isinstance(e, SystemExit) and e.code == 0:
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return 0
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sys.stderr.write("Failed to prepare guest environment\n")
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traceback.print_exc()
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return 2
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if args.interactive:
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if vm.ssh_interactive(*cmd) == 0:
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return 0
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vm.ssh_interactive()
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return 3
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else:
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if vm.ssh(*cmd) != 0:
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return 3
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