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# This file is part of cloud-init. See LICENSE file for license information.
"""Base NoCloud KVM instance."""
import os
import paramiko
import socket
import subprocess
import time
from cloudinit import util as c_util
from tests.cloud_tests.instances import base
from tests.cloud_tests import util
class NoCloudKVMInstance(base.Instance):
"""NoCloud KVM backed instance."""
platform_name = "nocloud-kvm"
def __init__(self, platform, name, properties, config, features,
user_data, meta_data):
"""Set up instance.
@param platform: platform object
@param name: image path
@param properties: dictionary of properties
@param config: dictionary of configuration values
@param features: dictionary of supported feature flags
"""
self.user_data = user_data
self.meta_data = meta_data
self.ssh_key_file = os.path.join(platform.config['data_dir'],
platform.config['private_key'])
self.ssh_port = None
self.pid = None
self.pid_file = None
super(NoCloudKVMInstance, self).__init__(
platform, name, properties, config, features)
def destroy(self):
"""Clean up instance."""
if self.pid:
try:
c_util.subp(['kill', '-9', self.pid])
except util.ProcessExectuionError:
pass
if self.pid_file:
os.remove(self.pid_file)
self.pid = None
super(NoCloudKVMInstance, self).destroy()
def execute(self, command, stdout=None, stderr=None, env=None,
rcs=None, description=None):
"""Execute command in instance.
Assumes functional networking and execution as root with the
target filesystem being available at /.
@param command: the command to execute as root inside the image
if command is a string, then it will be executed as:
['sh', '-c', command]
@param stdout, stderr: file handles to write output and error to
@param env: environment variables
@param rcs: allowed return codes from command
@param description: purpose of command
@return_value: tuple containing stdout data, stderr data, exit code
"""
if env is None:
env = {}
if isinstance(command, str):
command = ['sh', '-c', command]
if self.pid:
return self.ssh(command)
else:
return self.mount_image_callback(command) + (0,)
def mount_image_callback(self, cmd):
"""Run mount-image-callback."""
out, err = c_util.subp(['sudo', 'mount-image-callback',
'--system-mounts', '--system-resolvconf',
self.name, '--', 'chroot',
'_MOUNTPOINT_'] + cmd)
return out, err
def generate_seed(self, tmpdir):
"""Generate nocloud seed from user-data"""
seed_file = os.path.join(tmpdir, '%s_seed.img' % self.name)
user_data_file = os.path.join(tmpdir, '%s_user_data' % self.name)
with open(user_data_file, "w") as ud_file:
ud_file.write(self.user_data)
c_util.subp(['cloud-localds', seed_file, user_data_file])
return seed_file
def get_free_port(self):
"""Get a free port assigned by the kernel."""
s = socket.socket()
s.bind(('', 0))
num = s.getsockname()[1]
s.close()
return num
def push_file(self, local_path, remote_path):
"""Copy file at 'local_path' to instance at 'remote_path'.
If we have a pid then SSH is up, otherwise, use
mount-image-callback.
@param local_path: path on local instance
@param remote_path: path on remote instance
"""
if self.pid:
super(NoCloudKVMInstance, self).push_file()
else:
local_file = open(local_path)
p = subprocess.Popen(['sudo', 'mount-image-callback',
'--system-mounts', '--system-resolvconf',
self.name, '--', 'chroot', '_MOUNTPOINT_',
'/bin/sh', '-c', 'cat - > %s' % remote_path],
stdin=local_file,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
p.wait()
def sftp_put(self, path, data):
"""SFTP put a file."""
client = self._ssh_connect()
sftp = client.open_sftp()
with sftp.open(path, 'w') as f:
f.write(data)
client.close()
def ssh(self, command):
"""Run a command via SSH."""
client = self._ssh_connect()
try:
_, out, err = client.exec_command(util.shell_pack(command))
except paramiko.SSHException:
raise util.InTargetExecuteError('', '', -1, command, self.name)
exit = out.channel.recv_exit_status()
out = ''.join(out.readlines())
err = ''.join(err.readlines())
client.close()
return out, err, exit
def _ssh_connect(self, hostname='localhost', username='ubuntu',
banner_timeout=120, retry_attempts=30):
"""Connect via SSH."""
private_key = paramiko.RSAKey.from_private_key_file(self.ssh_key_file)
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
while retry_attempts:
try:
client.connect(hostname=hostname, username=username,
port=self.ssh_port, pkey=private_key,
banner_timeout=banner_timeout)
return client
except (paramiko.SSHException, TypeError):
time.sleep(1)
retry_attempts = retry_attempts - 1
error_desc = 'Failed command to: %s@%s:%s' % (username, hostname,
self.ssh_port)
raise util.InTargetExecuteError('', '', -1, 'ssh connect',
self.name, error_desc)
def start(self, wait=True, wait_for_cloud_init=False):
"""Start instance."""
tmpdir = self.platform.config['data_dir']
seed = self.generate_seed(tmpdir)
self.pid_file = os.path.join(tmpdir, '%s.pid' % self.name)
self.ssh_port = self.get_free_port()
subprocess.Popen(['./tools/xkvm',
'--disk', '%s,cache=unsafe' % self.name,
'--disk', '%s,cache=unsafe' % seed,
'--netdev',
'user,hostfwd=tcp::%s-:22' % self.ssh_port,
'--', '-pidfile', self.pid_file, '-vnc', 'none',
'-m', '2G', '-smp', '2'],
close_fds=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
while not os.path.exists(self.pid_file):
time.sleep(1)
with open(self.pid_file, 'r') as pid_f:
self.pid = pid_f.readlines()[0].strip()
if wait:
self._wait_for_system(wait_for_cloud_init)
def write_data(self, remote_path, data):
"""Write data to instance filesystem.
@param remote_path: path in instance
@param data: data to write, either str or bytes
"""
self.sftp_put(remote_path, data)
# vi: ts=4 expandtab
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