def found_new_qdisk(domid, devid, uuid):
q = qmp.QEMUMonitorProtocol(
'{}/qemu-dp/qmp_sock.{}'.format(var_run_prefix(), uuid))
path = '{}/{}'.format(var_run_prefix(), uuid)
with open(path, 'w') as f:
f.write("/local/domain/{}/device/vbd/{}/state".format(domid, devid))
params = {}
params['domid'] = domid
params['devid'] = devid
params['type'] = 'qdisk'
params['blocknode'] = 'qemu_node'
params['devicename'] = uuid
connected = False
count = 0
while not connected:
try:
q.connect()
connected = True
except:
if count > 5:
print "ERROR: not delivering xen-watch-device %s" % params
return
print ("got exception {};"
" sleeping before attempting reconnect...".format(
sys.exc_info()))
time.sleep(1)
count += 1
print "calling: xen-watch-device %s" % params
res = q.command('xen-watch-device', **params)
print "result: %s" % res
def close(self, dbg, key, f):
# FIXME: this would not work for raw support
# assert isinstance(f, image.Cow)
log.debug("%s: closing image %s in qemu with sock %s" %
(dbg, f, self.qmp_sock))
try:
self._qmp_connect(dbg)
path = "{}/{}".format(var_run_prefix(), key)
try:
with open(path, 'r') as f:
line = f.readline().strip()
os.unlink(path)
args = {
'type': 'qdisk',
'domid': int(re.search(r'domain/(\d+)/', line).group(1)),
'devid': int(re.search(r'vbd/(\d+)/', line).group(1))
}
self._qmp_command(dbg, "xen-unwatch-device", **args)
except:
log.debug('No VBD found')
# Stop the NBD server
self._qmp_command(dbg, "nbd-server-stop")
# Remove the block device
args = {"node-name": LEAF_NODE_NAME}
self._qmp_command(dbg, "blockdev-del", **args)
self._qmp_disconnect(dbg)
except Exception as e:
log.debug('{}: failed to close qemu: {}'.format(dbg, e))
self._kill_qemu()
def create(dbg, key):
socket_dir = os.path.join(var_run_prefix(), 'qemu-dp')
mkdir_p(socket_dir, 0o0700)
qmp_sock = os.path.join(socket_dir, 'qmp_sock.{}'.format(key))
log.debug("spawning qemu process with qmp socket at %s" % (qmp_sock))
cmd = [QEMU_DP, qmp_sock]
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
log.debug("new qemu process has pid %d" % (p.pid))
return Qemudisk(p.pid, qmp_sock, key, None)
def stop():
with VolumeContext(callbacks, uri, 'w') as opq:
path = os.path.join(util.var_run_prefix(), 'sr',
callbacks.getUniqueIdentifier(opq),
name + '_task.pickle')
with open(path) as f:
process = pickle.load(f)
process.kill()
process.wait()
os.unlink(path)
def start_task(dbg_msg, uri, callbacks, name, args):
with VolumeContext(callbacks, uri, 'w') as opq:
task = subprocess.Popen(args)
log.debug(dbg_msg)
path = os.path.join(util.var_run_prefix(), 'sr',
callbacks.getUniqueIdentifier(opq))
try:
os.makedirs(path)
except OSError:
pass
path = os.path.join(path, name + '_task.pickle')
with open(path, 'w+') as f:
pickle.dump(task, f)
def _metadata_dir(path):
return os.path.join(var_run_prefix(), "nonpersistent", "dp-tapdisk",
os.path.realpath(path).lstrip('/'))