Fam Zheng <f...@redhat.com> writes:
> 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 <f...@redhat.com>
> ---
> tests/vm/basevm.py | 276
> +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 276 insertions(+)
> create mode 100755 tests/vm/basevm.py
>
> diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
> new file mode 100755
> index 0000000000..9db91d61fa
> --- /dev/null
> +++ b/tests/vm/basevm.py
> @@ -0,0 +1,276 @@
> +#!/usr/bin/env python
> +#
> +# VM testing base class
> +#
> +# Copyright (C) 2017 Red Hat Inc.
> +#
> +# Authors:
> +# Fam Zheng <f...@redhat.com>
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2. See
> +# the COPYING file in the top-level directory.
> +#
> +
> +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
> +import subprocess
> +import hashlib
> +import optparse
> +import atexit
> +import tempfile
> +import shutil
> +import multiprocessing
> +import traceback
> +
> +SSH_KEY = """\
> +-----BEGIN RSA PRIVATE KEY-----
> +MIIEowIBAAKCAQEAopAuOlmLV6LVHdFBj8/eeOwI9CqguIJPp7eAQSZvOiB4Ag/R
> +coEhl/RBbrV5Yc/SmSD4PTpJO/iM10RwliNjDb4a3I8q3sykRJu9c9PI/YsH8WN9
> ++NH2NjKPtJIcKTu287IM5JYxyB6nDoOzILbTyJ1TDR/xH6qYEfBAyiblggdjcvhA
> +RTf93QIn39F/xLypXvT1K2O9BJEsnJ8lEUvB2UXhKo/JTfSeZF8wPBeowaP9EONk
> +7b+nuJOWHGg68Ji6wVi62tjwl2Szch6lxIhZBpnV7QNRKMfYHP6eIyF4pusazzZq
> +Telsq6xI2ghecWLzb/MF5A+rklsGx2FNuJSAJwIDAQABAoIBAHHi4o/8VZNivz0x
> +cWXn8erzKV6tUoWQvW85Lj/2RiwJvSlsnYZDkx5af1CpEE2HA/pFT8PNRqsd+MWC
> +7AEy710cVsM4BYerBFYQaYxwzblaoojo88LSjVPw3h5Z0iLM8+IMVd36nwuc9dpE
> +R8TecMZ1+U4Tl6BgqkK+9xToZRdPKdjS8L5MoFhGN+xY0vRbbJbGaV9Q0IHxLBkB
> +rEBV7T1mUynneCHRUQlJQEwJmKpT8MH3IjsUXlG5YvnuuvcQJSNTaW2iDLxuOKp8
> +cxW8+qL88zpb1D5dppoIu6rlrugN0azSq70ruFJQPc/A8GQrDKoGgRQiagxNY3u+
> +vHZzXlECgYEA0dKO3gfkSxsDBb94sQwskMScqLhcKhztEa8kPxTx6Yqh+x8/scx3
> +XhJyOt669P8U1v8a/2Al+s81oZzzfQSzO1Q7gEwSrgBcRMSIoRBUw9uYcy02ngb/
> +j/ng3DGivfJztjjiSJwb46FHkJ2JR8mF2UisC6UMXk3NgFY/3vWQx78CgYEAxlcG
> +T3hfSWSmTgKRczMJuHQOX9ULfTBIqwP5VqkkkiavzigGRirzb5lgnmuTSPTpF0LB
> +XVPjR2M4q+7gzP0Dca3pocrvLEoxjwIKnCbYKnyyvnUoE9qHv4Kr+vDbgWpa2LXG
> +JbLmE7tgTCIp20jOPPT4xuDvlbzQZBJ5qCQSoZkCgYEAgrotSSihlCnAOFSTXbu4
> +CHp3IKe8xIBBNENq0eK61kcJpOxTQvOha3sSsJsU4JAM6+cFaxb8kseHIqonCj1j
> +bhOM/uJmwQJ4el/4wGDsbxriYOBKpyq1D38gGhDS1IW6kk3erl6VAb36WJ/OaGum
> +eTpN9vNeQWM4Jj2WjdNx4QECgYAwTdd6mU1TmZCrJRL5ZG+0nYc2rbMrnQvFoqUi
> +BvWiJovggHzur90zy73tNzPaq9Ls2FQxf5G1vCN8NCRJqEEjeYCR59OSDMu/EXc2
> +CnvQ9SevHOdS1oEDEjcCWZCMFzPi3XpRih1gptzQDe31uuiHjf3cqcGPzTlPdfRt
> +D8P92QKBgC4UaBvIRwREVJsdZzpIzm224Bpe8LOmA7DeTnjlT0b3lkGiBJ36/Q0p
> +VhYh/6cjX4/iuIs7gJbGon7B+YPB8scmOi3fj0+nkJAONue1mMfBNkba6qQTc6Y2
> +5mEKw2/O7/JpND7ucU3OK9plcw/qnrWDgHxl0Iz95+OzUIIagxne
> +-----END RSA PRIVATE KEY-----
> +"""
> +SSH_PUB_KEY = """\
> +ssh-rsa
> AAAAB3NzaC1yc2EAAAADAQABAAABAQCikC46WYtXotUd0UGPz9547Aj0KqC4gk+nt4BBJm86IHgCD9FygSGX9EFutXlhz9KZIPg9Okk7+IzXRHCWI2MNvhrcjyrezKREm71z08j9iwfxY3340fY2Mo+0khwpO7bzsgzkljHIHqcOg7MgttPInVMNH/EfqpgR8EDKJuWCB2Ny+EBFN/3dAiff0X/EvKle9PUrY70EkSycnyURS8HZReEqj8lN9J5kXzA8F6jBo/0Q42Ttv6e4k5YcaDrwmLrBWLra2PCXZLNyHqXEiFkGmdXtA1Eox9gc/p4jIXim6xrPNmpN6WyrrEjaCF5xYvNv8wXkD6uSWwbHYU24lIAn
> qemu-vm-key
> +"""
I'm not sure we should be embedding the keys in the script. I understand
we need a common key for downloaded images (although it would be better
to post-customise the image after download with the local developer
keys). Perhaps ./tests/testing-keys/id_rsa[.pub]?
> +
> +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"
> + def __init__(self, debug=False, vcpus=None):
> + self._guest = None
> + self._tmpdir = 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)
As above, I think it would be better just to keep copies of the keys in
the tests directory rather than in the python source.
> +
> + self.debug = debug
> + self._stderr = sys.stderr
> + self._devnull = open("/dev/null", "w")
You can use os.devnull as a portable reference.
> + if self.debug:
> + self._stdout = sys.stdout
> + else:
> + self._stdout = self._devnull
> + self._args = [ \
> + "-nodefaults", "-m", "2G",
> + "-cpu", "host",
> + "-netdev", "user,id=vnet,hostfwd=:0.0.0.0:0-:22",
It doesn't help that howstfwd is poorly documented. Are we trying to map
an ephemeral port to the guests 22?
> + "-device", "virtio-net-pci,netdev=vnet",
> + "-vnc", ":0,to=20",
Do we need a GUI?
> + "-serial", "file:%s" % os.path.join(self._tmpdir,
> "serial.out")]
> + if vcpus:
> + self._args += ["-smp", str(vcpus)]
> + if os.access("/dev/kvm", os.R_OK | os.W_OK):
> + 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)
Using wget rather than doing it internally adds a utility requirement.
Is doing a pure python urllib2 fetch too slow for this?
> + 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=/dev/null",
> + "-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,
> + stdin=sys.stdin if interactive else
> self._devnull,
> + stdout=sys.stdout if interactive else
> self._stdout,
> + stderr=sys.stderr if interactive else
> self._stderr)
> + 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",
Is specifying a display device at boot time really needed (say rather
than further up with the rest of the machine description). Do we even
want a display given use ssh/serial for everything?
> + "-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))
> + guest = QEMUMachine(binary=os.environ.get("QEMU",
> "qemu-system-x86_64"),
> + args=args)
> + guest.launch()
> + 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=120):
> + starttime = datetime.datetime.now()
> + guest_up = False
> + while (datetime.datetime.now() - starttime).total_seconds() <
> seconds:
> + if self.ssh("exit 0") == 0:
> + guest_up = True
> + break
> + 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(vm_name):
> + 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" % vm_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=multiprocessing.cpu_count() / 2,
> + help="number of virtual CPUs")
> + 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.disable_interspersed_args()
> + return parser.parse_args()
> +
> +def main(vmcls):
> + try:
> + args, argv = parse_args(vmcls.name)
> + if not argv and not args.build_qemu and not args.build_image:
> + print "Nothing to do?"
> + return 1
> + if args.debug:
> + logging.getLogger().setLevel(logging.DEBUG)
> + 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)]
> + else:
> + cmd = argv
> + vm.boot(args.image + ",snapshot=on")
If this fails it's fairly cryptic:
/home/alex/lsrc/qemu/qemu.git/tests/vm/openbsd --debug --image
"tests/vm/openbsd.img" --build-qemu /home/alex/lsrc/qemu/qemu.git
DEBUG:root:Creating archive ./vm-test-fxejnB.tmp/data-2de24.tar for src_dir
dir: /home/alex/lsrc/qemu/qemu.git
DEBUG:root:QEMU args: -nodefaults -m 2G -cpu host -netdev
user,id=vnet,hostfwd=:0.0.0.0:0-:22 -device virtio-net-pci,netdev=vnet -vnc
:0,to=20 -serial file:./vm-test-fxejnB.tmp/serial.out -smp 4 -enable-kvm
-device VGA -drive
file=tests/vm/openbsd.img,snapshot=on,if=none,id=drive0,cache=writeback -device
virtio-blk,drive=drive0,bootindex=0 -drive
file=./vm-test-fxejnB.tmp/data-2de24.tar,if=none,id=data-2de24,cache=writeback,format=raw
-device virtio-blk,drive=data-2de24,serial=data-2de24,bootindex=1
Failed to prepare guest environment
Traceback (most recent call last):
File "/home/alex/lsrc/qemu/qemu.git/tests/vm/basevm.py", line 260, in main
vm.boot(args.image + ",snapshot=on")
File "/home/alex/lsrc/qemu/qemu.git/tests/vm/basevm.py", line 184, in boot
guest.launch()
File "/home/alex/lsrc/qemu/qemu.git/tests/vm/../../scripts/qemu.py", line
151, in launch
self._post_launch()
File "/home/alex/lsrc/qemu/qemu.git/tests/vm/../../scripts/qemu.py", line
135, in _post_launch
self._qmp.accept()
File "/home/alex/lsrc/qemu/qemu.git/tests/vm/../../scripts/qmp/qmp.py", line
147, in accept
return self.__negotiate_capabilities()
File "/home/alex/lsrc/qemu/qemu.git/tests/vm/../../scripts/qmp/qmp.py", line
60, in __negotiate_capabilities
raise QMPConnectError
QMPConnectError
I assume QEMU failed to boot and might have given us a message that
would be useful.
> + 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
--
Alex Bennée
