164 lines
4.5 KiB
Python
164 lines
4.5 KiB
Python
#!/usr/bin/env python
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import logging
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import netifaces
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import os
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import subprocess
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import yaml
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XS_RSA = '/root/.ssh/xs_rsa'
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ASTUTE_PATH = '/etc/astute.yaml'
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ASTUTE_SECTION = '@PLUGIN_NAME@'
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LOG_ROOT = '/var/log/@PLUGIN_NAME@'
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HIMN_IP = '169.254.0.1'
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class ExecutionError(Exception):
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pass
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class FatalException(Exception):
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pass
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def reportError(err):
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logging.error(err)
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raise FatalException(err)
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def execute(*cmd, **kwargs):
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cmd = map(str, cmd)
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_env = kwargs.get('env')
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env_prefix = ''
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if _env:
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env_prefix = ''.join(['%s=%s ' % (k, _env[k]) for k in _env])
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env = dict(os.environ)
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env.update(_env)
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else:
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env = None
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logging.info(env_prefix + ' '.join(cmd))
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proc = subprocess.Popen(cmd, stdin=subprocess.PIPE, # nosec
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE, env=env)
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if 'prompt' in kwargs:
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prompt = kwargs.get('prompt')
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proc.stdout.flush()
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(out, err) = proc.communicate(prompt)
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else:
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out = proc.stdout.readlines()
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err = proc.stderr.readlines()
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(out, err) = map(' '.join, [out, err])
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# Both if/else need to deal with "\n" scenario
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(out, err) = (out.replace('\n', ''), err.replace('\n', ''))
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if out:
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logging.debug(out)
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if err:
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logging.error(err)
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if proc.returncode is not None and proc.returncode != 0:
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raise ExecutionError(err)
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return out
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def ssh(host, username, *cmd, **kwargs):
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cmd = map(str, cmd)
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return execute('ssh', '-i', XS_RSA,
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'-o', 'StrictHostKeyChecking=no',
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'%s@%s' % (username, host), *cmd,
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prompt=kwargs.get('prompt'))
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def scp(host, username, target_path, filename):
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return execute('scp', '-i', XS_RSA,
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'-o', 'StrictHostKeyChecking=no', filename,
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'%s@%s:%s' % (username, host, target_path))
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def get_astute(astute_path=ASTUTE_PATH):
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"""Return the root object read from astute.yaml"""
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if not os.path.exists(astute_path):
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reportError('%s not found' % astute_path)
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with open(astute_path) as f:
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astute = yaml.safe_load(f)
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return astute
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def astute_get(dct, keys, default=None, fail_if_missing=True):
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"""A safe dictionary getter"""
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for key in keys:
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if key in dct:
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dct = dct[key]
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else:
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if fail_if_missing:
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reportError('Value of "%s" is missing' % key)
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return default
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return dct
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def get_options(astute, astute_section=ASTUTE_SECTION):
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"""Return username and password filled in plugin."""
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if astute_section not in astute:
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reportError('%s not found' % astute_section)
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options = astute[astute_section]
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logging.info('username: {username}'.format(**options))
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logging.info('password: {password}'.format(**options))
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logging.info('install_xapi: {install_xapi}'.format(**options))
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return options['username'], options['password'], \
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options['install_xapi']
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def init_eth():
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"""Initialize the net interface connected to HIMN
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Returns:
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the IP addresses of local host and hypervisor.
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"""
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def _mac(eth):
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return netifaces.ifaddresses(eth).get(netifaces.AF_LINK)[0]['addr']
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domid = execute('xenstore-read', 'domid')
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himn_mac = execute(
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'xenstore-read',
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'/local/domain/%s/vm-data/himn_mac' % domid)
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logging.info('himn_mac: %s' % himn_mac)
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eths = [eth for eth in netifaces.interfaces() if _mac(eth) == himn_mac]
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if len(eths) != 1:
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reportError('Cannot find eth matches himn_mac')
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eth = eths[0]
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logging.info('himn_eth: %s' % eth)
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ip = netifaces.ifaddresses(eth).get(netifaces.AF_INET)
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if not ip:
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execute('dhclient', eth)
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fname = '/etc/network/interfaces.d/ifcfg-' + eth
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s = ('auto {eth}\n'
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'iface {eth} inet dhcp\n'
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'post-up route del default dev {eth}').format(eth=eth)
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with open(fname, 'w') as f:
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f.write(s)
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logging.info('%s created' % fname)
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execute('ifdown', eth)
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execute('ifup', eth)
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ip = netifaces.ifaddresses(eth).get(netifaces.AF_INET)
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if ip:
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himn_local = ip[0]['addr']
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himn_xs = '.'.join(himn_local.split('.')[:-1] + ['1'])
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if HIMN_IP == himn_xs:
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logging.info('himn_local: %s' % himn_local)
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return eth, himn_local
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reportError('HIMN failed to get IP address from Hypervisor')
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