def _execute(cls, options, command, args, run_as_root=False,
namespace=None, log_fail_as_error=True):
opt_list = ['-%s' % o for o in options]
ip_cmd = add_namespace_to_cmd(['ip'], namespace)
cmd = ip_cmd + opt_list + [command] + list(args)
return utils.execute(cmd, run_as_root=run_as_root,
log_fail_as_error=log_fail_as_error)
def run_vsctl(self, args):
full_args = ["ovs-vsctl"] + self.opts + args
try:
# We log our own errors, so never have utils.execute do it
return utils.execute(full_args, run_as_root=True,
log_fail_as_error=False).rstrip()
except Exception:
with excutils.save_and_reraise_exception() as ctxt:
if self.log_errors:
LOG.exception(("Unable to execute %(cmd)s."),
{'cmd': full_args})
if not self.check_error:
ctxt.reraise = False
def get_xapi_iface_id(self, xs_vif_uuid):
args = [
"xe", "vif-param-get", "param-name=other-config",
"param-key=nicira-iface-id",
"uuid=%s" % xs_vif_uuid
]
try:
return utils.execute(args, run_as_root=True).strip()
except Exception as e:
with excutils.save_and_reraise_exception():
LOG.error(("Unable to execute %(cmd)s. "
"Exception: %(exception)s"), {
'cmd': args,
'exception': e
})
def execute(self, cmds, addl_env=None, check_exit_code=True,
log_fail_as_error=True, extra_ok_codes=None,
run_as_root=False):
ns_params = []
kwargs = {'run_as_root': run_as_root}
if self._parent.namespace:
kwargs['run_as_root'] = True
ns_params = ['ip', 'netns', 'exec', self._parent.namespace]
env_params = []
if addl_env:
env_params = (['env'] +
['%s=%s' % pair for pair in addl_env.items()])
cmd = ns_params + env_params + list(cmds)
return utils.execute(cmd, check_exit_code=check_exit_code,
extra_ok_codes=extra_ok_codes,
log_fail_as_error=log_fail_as_error, **kwargs)
def get_devices(self, exclude_loopback=False):
retval = []
if self.namespace:
# we call out manually because in order to avoid screen scraping
# iproute2 we use find to see what is in the sysfs directory, as
# suggested by Stephen Hemminger (iproute2 dev).
output = utils.execute(['ip', 'netns', 'exec', self.namespace,
'find', SYS_NET_PATH, '-maxdepth', '1',
'-type', 'l', '-printf', '%f '],
run_as_root=True,
log_fail_as_error=self.log_fail_as_error
).split()
else:
output = (
i for i in os.listdir(SYS_NET_PATH)
if os.path.islink(os.path.join(SYS_NET_PATH, i))
)
for name in output:
if exclude_loopback and name == LOOPBACK_DEVNAME:
continue
retval.append(IPDevice(name, namespace=self.namespace))
return retval
def run_ofctl(self, cmd, args, process_input=None):
full_args = ["ovs-ofctl", cmd, self.br_name] + args
# TODO(kevinbenton): This error handling is really brittle and only
# detects one specific type of failure. The callers of this need to
# be refactored to expect errors so we can re-raise and they can
# take appropriate action based on the type of error.
for i in range(1, 11):
try:
return utils.execute(full_args,
run_as_root=True,
process_input=process_input)
except Exception as e:
if "failed to connect to socket" in str(e):
LOG.debug(
"Failed to connect to OVS. Retrying "
"in 1 second. Attempt: %s/10", i)
time.sleep(1)
continue
LOG.error(("Unable to execute %(cmd)s. Exception: "
"%(exception)s"), {
'cmd': full_args,
'exception': e
})
break
def iproute_arg_supported(command, arg):
command += ['help']
stdout, stderr = utils.execute(command, check_exit_code=False,
return_stderr=True)
return any(arg in line for line in stderr.split('\n'))
